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WO1996012889A1 - Moteur hydraulique a vitesse variable - Google Patents

Moteur hydraulique a vitesse variable Download PDF

Info

Publication number
WO1996012889A1
WO1996012889A1 PCT/JP1995/002170 JP9502170W WO9612889A1 WO 1996012889 A1 WO1996012889 A1 WO 1996012889A1 JP 9502170 W JP9502170 W JP 9502170W WO 9612889 A1 WO9612889 A1 WO 9612889A1
Authority
WO
WIPO (PCT)
Prior art keywords
swash plate
piston
pistons
plate angle
cylinder block
Prior art date
Application number
PCT/JP1995/002170
Other languages
English (en)
Japanese (ja)
Inventor
Seita Hayashi
Sadao Nunotani
Mitsuru Arai
Hideki Kado
Original Assignee
Komatsu Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Komatsu Ltd. filed Critical Komatsu Ltd.
Publication of WO1996012889A1 publication Critical patent/WO1996012889A1/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/22—Reciprocating-piston liquid engines with movable cylinders or cylinder
    • F03C1/24—Reciprocating-piston liquid engines with movable cylinders or cylinder in which the liquid exclusively displaces one or more pistons reciprocating in rotary cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03C—POSITIVE-DISPLACEMENT ENGINES DRIVEN BY LIQUIDS
    • F03C1/00—Reciprocating-piston liquid engines
    • F03C1/02—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders
    • F03C1/06—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis
    • F03C1/0636—Reciprocating-piston liquid engines with multiple-cylinders, characterised by the number or arrangement of cylinders with cylinder axes generally coaxial with, or parallel or inclined to, main shaft axis having rotary cylinder block

Definitions

  • the present invention relates to a variable-speed hydraulic motor used as a traveling motor of a construction machine.
  • variable speed hydraulic motor for example, the one disclosed in Japanese Patent Publication No. Hei 4-424550 is known.
  • a shaft 2 is rotatably supported in a casing 1, and a cylinder block 3 is coupled to the shaft 2 so that the shaft 2 can rotate together with the shaft 2.
  • a plurality of cylinder holes 4 are formed in the cylinder block 3 in parallel with the shaft 2 at intervals in the circumferential direction, and a piston 5 can slide in each cylinder hole 4. It is inserted in.
  • a thrust ball 16 is coupled to the shaft 2, and the thrust ball 16 is attached to the shaft 2 by being along the surface 7 a of the swash plate 7.
  • the slanted ball 16 and the shaft 6 are adapted to be able to rotate together with the shaft 2, and the spring 16a is fitted to the spring 16a.
  • the swash plate 7 is further urged. Further, the tip of each of the stones 5 is universally connected to the shoe 6.
  • hydraulic oil from a hydraulic source (not shown) is supplied to and discharged from each cylinder hole 4 through the motor ports 13 and 14 and the piston 5 is reciprocated, the swash plate 7 The surface of the piston 5 together with the shower 6
  • the shaft 2 is rotated together with the cylinder block 3 by guiding the shaft 2 in the circumferential direction.
  • the back surface 7b of the swash plate 7 is composed of a first sheet surface 8 and a second sheet surface 9 which form a predetermined angle different from the surface 7a, and the first sheet surface 8 is formed.
  • the angle of the swash plate becomes large when it comes into contact with the inner wall 1a of the casing, and the angle of the swash plate becomes smaller when the second sheet surface 9 comes into contact with the inner wall 1a of the casing. Then, the swash plate 7 is pushed by the resultant force of the thrust of the piston 5 in the direction of the swash plate, and the boundary portion between the first sheet metal 8 and the second sheet surface 9 is set to the swing fulcrum 15.
  • the first sheet 8 is brought into contact with the inner wall 1a of the casing 1 by oscillating it.
  • the casing 1 is provided with a piston 10 for changing the swash plate angle.
  • the swash plate 7 is pushed by pushing the swash plate angle changing piston 10 by supplying the crane to 1 and the boundary between the first sheet surface 8 and the second sheet metal 9 is pushed.
  • the second seat surface 9 is brought into contact with the inner wall 1a of the casing by swinging with the swinging fulcrum 15.
  • the stroke of Biston 5 is changed, thereby changing the capacity of the shear pressure motor and changing the rotation speed of the hydraulic motor. are doing. These constitute the transmission of the hydraulic motor.
  • variable speed hydraulic motor one disclosed in Japanese Utility Model Laid-Open No. 4-175162 is known.
  • an annular oil chamber 11 is provided by providing an annular swash plate angle changing piston 10 on an outer peripheral surface 12 of a casing 1 constituting a hydraulic pump, as shown in FIG.
  • the swash plate 7 is pushed with the swash plate angle changing piston 10 and the second sheet surface 9 is cased. It comes into contact with the inner wall 1a.
  • the swash plate 7 may rise with the contact portion between the second sheet surface 9 and the casing inner wall 1a as a fulcrum. .
  • the rise of the swash plate becomes more remarkable when the number of pistons 5 is reduced from nine to seven or five. The reason is as follows.
  • the thrust in the direction pushing the swash plate 7 side is generated in the piston 5 by the high pressure oil supplied from the motor inlet ports 13 and 14, and the resultant force of the thrusts of the plurality of pistons 5 is oblique.
  • the swash plate 7 is swung clockwise by the resultant force and the first sheet surface 8 is pressed against the inner casing wall 1a.
  • the swash plate 7 is swung counterclockwise by the thrust of the swash plate angle changing piston 10 against the resultant force, and the second sheet surface 9 is moved. It is pressed against the inner wall la of one shing.
  • the moment due to the thrust of the piston 10 for changing the swash plate angle is larger than the moment due to the resultant of the thrust of the piston 5.
  • -A- so that the point of application of the swash plate angle changing piston 10 is closer to the periphery of the first sheet surface 8 than the point of application of the resultant force of the thrust of piston 5. Need to be on the side.
  • the point of application of the resultant force Fa of the thrust of the piston 5 in the swash plate direction is slightly shifted depending on the rotation angle of the cylindrical lock 3, and the amount of the shift is smaller as the number of the pistons 5 is smaller. growing.
  • the action point of the resultant force F a in the swash plate direction of the thrust of piston 5 must be set in consideration of the amount of deviation, and the action of the swash plate angle changing piston 10 must be set. It is necessary to move the point away from the boundary between the first sheet surface 8 and the second sheet surface 9, etc., so that the first sheet surface 8 becomes large and the second sheet metal 9 becomes small. As a result, the swash plate 7 tends to float with the contact portion between the second sheet surface 9 and the inner casing wall 1a as a fulcrum as described above.
  • the displacement at point 19 where the resultant force of the piston thrust is applied to the swash plate 7 becomes smaller as the number of pistons increases, and increases as the number decreases, so that the number of pistons decreases. The lower the temperature, the more easily swash plate floating occurs.
  • a swash plate angle changing piston 10 is provided on the front side of the swash plate 7 (the cylinder block 3 mm).
  • the thrust F of the angle changing piston acts on the end of the swash plate 7 on the second sheet surface 9 side.
  • the swing fulcrum 15 of the swash plate 7 is located in the cylinder block 3.
  • the second sheet surface 9 is closer to the center 3a than the center 3a. Supply the high-pressure oil to the swash room 11 of the swash plate angle changing screw 10 in order to obtain the required moment because the moment of change (F x L i) becomes smaller. It has the same issues as the example shown in Fig. 1.
  • the torque is low and the torque is high at the time of starting. Therefore, it is desirable to increase the capacity of the hydraulic motor. For this reason, it is desirable that the swash plate angle be large when the thrust of the swash plate angle changing piston 10 does not act.
  • the swing center 15 of the swash plate 7 is opposite to the action point 19 of the resultant force of the force of the piston 5 with respect to the center 3 a of the cylinder block 3. Side.
  • the distance L 1 between the point of application of the thrust F of the swash plate angle changing piston 10 and the fulcrum 15 is short, and the moment (FXL 1) swings the swash plate 7. Therefore, it is necessary to increase the thrust F of the swash plate angle changing piston 10 in order to obtain the required moment. Therefore, even if the pressure receiving area of the swash plate angle changing piston 10 is large, the pressure of the pressure oil supplied to the oil chamber 11 needs to be high, so that the same as the variable hydraulic motor shown in FIG. Trouble occurs.
  • the point on the opposite side of the swash plate 7 from the swing center 15 with respect to the center 3a of the cylinder block 3 is a swash plate angle.
  • Press with change piston 10 to change swash plate angle Since the distance L 1 between the point of application of the thrust F of the piston 10 and the swing center 15 increases, the moment (FXL 1) swinging the swash plate 7 increases. Even if the pressure receiving area of the piston 10 for changing the swash plate angle is small, the pressure of the hydraulic oil of the hydraulic pressure 11 is not set to be too high, and the same size as the variable speed hydraulic motor shown in FIG. A moment for swinging the swash plate 7 is obtained.
  • the present invention provides a variable-speed hydraulic motor in which the pressure oil for driving the swash plate angle changing piston can be low pressure and the swash plate can be prevented from floating. It is intended to provide. Disclosure of the invention
  • a cylinder block rotatably provided with a shaft in a casing;
  • a plurality of pistons which are inserted into the cylinder block and slide in parallel with the axis, are attached to a casing so as to be swingable, and the plurality of pistons are mounted on the surface of the cylinder.
  • a swash plate for changing the stroke of the piston by guiding it in the circumferential direction and changing its inclination,
  • the swash plate is swung in the large swash plate angle direction by the combined force of the thrusts of the plurality of pistons, and the swash plate angle is decreased in the small direction by the thrust of the swash plate angle changing piston.
  • the center of the swash plate is positioned on the same side as the resultant point of the resultant force of the thrusts of the plurality of screws with respect to the center of the cylinder block, and is located outside the center.
  • the swash plate angle changing piston is formed in an annular shape, and the action point of the swash plate angle changing piston is set in relation to the center of the cylinder block.
  • a variable-speed shan pressure motor located outside the point of application of the resultant force of piston thrust.
  • the pressure receiving area is increased by making the swash plate angle changing piston annular, and the action point of the swash plate angle changing piston is changed to a cylinder block.
  • a stopper is provided on the swash plate angle changing screw-on, a stopper receiving portion is provided on the casing, and a stroke of the swash plate angle changing screw-on is provided. It is desirable to regulate.
  • FIG. 1 is a sectional view showing an example of a conventional variable speed hydraulic motor.
  • FIG. 2 is a sectional view showing another example of the conventional variable speed hydraulic motor.
  • FIG. 3 is an explanatory diagram showing an example of a device for supplying a high-pressure shank for driving a hydraulic motor to a shanto motor.
  • FIG. 4 is an explanatory diagram showing another example of a device for supplying high-pressure oil for driving a hydraulic motor to a hydraulic motor.
  • FIG. 5 is a cross-sectional view showing a state in which the swash plate angle is large in one embodiment of the variable speed hydraulic motor according to the present invention.
  • FIG. 6 is a cross-sectional view showing a state where the swash plate angle is small in the above embodiment.
  • variable-speed shanghai pressure motor according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings.
  • the casing is formed by a motor case 22 composed of a cylindrical portion 20 and an end wall portion 21 and a cover 23 fitted to and attached to the cylindrical portion 20. 24.
  • a shaft 2 G is rotatably supported in the casing 24, and a cylinder block 25 is connected to the shaft 26 so that the shaft 2 G can rotate together with the shaft 26.
  • the shaft 26 is rotatably supported by a bearing 31 on the end wall 21 of the motor case 22 and the cover 23.
  • a plurality of cylinder holes 27 are formed in the cylinder block 25 in parallel with the shaft 26 at intervals in the circumferential direction, and a piston is provided in each cylinder hole 27. 28 are slidably inserted.
  • a thrust ball 46 is coupled to the shaft 2, and the thrust pole 46 is formed along the surface 30 a of the swash plate 30, so that the thrust ball 46 is opposed to the shaft 26.
  • the slanted shaft 29 is fitted with the thrust ball 46 and the shaft 29 so as to be able to rotate with the shaft 26 and to the spring 7. More swash plate 30 side Have been.
  • the tip of each piston 28 is universally connected to a sleeve 29. Then, when pressure oil from a hydraulic pressure source (not shown) is supplied and discharged into each of the cylinder holes 27 and the piston 28 is moved back and forth, the swash plate 30 is moved together with the screw 29. By guiding the piston 28 in the circumferential direction, the shaft 26 is rotated together with the cylinder block 25.
  • the swash plate 30 has a rear surface 30b formed with a first sheet metal 32 at a predetermined angle with respect to the front surface 30a, and the first sheet metal 32 is formed as a cover.
  • the retainer ball 35 is used to support the inner surface 23 a of the knob 23 (the receiving portion 34 of the casing 24) so as to be able to come into contact with or be separated therefrom. Then, when the first sheet surface 32 contacts the inner surface 23a of the cover 23, the swash plate angle becomes large, and the first sheet surface 32 is separated from the inner surface 23a of the force bar 23. And the swash plate angle is small.
  • the center of the retainer ball 35 that is, the swash plate swing center 36, is on the same side of the center 37 of the cylinder block 25 as the point of application of the resultant force of the thrust of the piston 28. Is located further outside.
  • An annular cylinder hole 39 is formed by the outer peripheral surface 20 a of the cylindrical portion 20 and the small-diameter projecting portion 38 of the cover 23, and the annular cylinder hole 39 has an annular inclined hole 39.
  • the board angle changing screws 40 are slidably fitted to form a room 41.
  • the oil chamber 41 communicates with the pressure change oil inlet port 43 through an oil passage 42 formed in the motor case 22.
  • the piston 40 for changing the swash plate angle has a cylindrical stopper.
  • the stopper 44 is slidably fitted on the outer peripheral surface 20a of the cylindrical portion 20 and is formed on the inner periphery 20a. It faces the stopper stopper 45 formed.
  • the stopper 44 may be formed as a pin and attached to the swash plate angle changing screw 40.
  • the stopper 44 comes into contact with the stopper receiving portion 45 and the swash plate 30 does not swing more than necessary.
  • the swash plate 30 does not float even when the pressure of the hydraulic oil in the hydraulic pressure 41 becomes high.
  • the cover 23 of the casing 24 is located on the swash plate 30 side, and by removing the cover 23, the cylinder block 25 and the swash plate 30 are attached. Later, the swash plate angle changing screws 40 can be attached, or only the swash plate angle changing screws 40 can be removed. This not only simplifies the assembly work but also reduces the swash plate angle.
  • the replacement piston 40 can be exchanged for ⁇ .
  • variable speed Shanto motor has a large pressure receiving area of the swash plate angle changing piston 40 and a point that the thrust of the swash plate angle changing river piston 40 acts. Combined with the long distance to the swash plate swing center 36, the pressure of the presser pressing the swash plate angle changing stone 40 can be reduced.
  • this allows pressure oil to be supplied from a low-pressure hydraulic source to the shanty chamber 41 of the piston 40 for changing the angle of the swash plate, so that the shuttle valve and the switching valve are packaged. It is no longer necessary to supply the high-pressure shanks for driving the hydraulic motor to the Shan Room 41, so that the variable-speed shanto-pressure motor can be compactly constructed.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Hydraulic Motors (AREA)

Abstract

Cette invention se rapporte à un moteur hydraulique à vitesse variable, qui comprend un bloc-cylindres (25), plusieurs pistons (28) et un disque en nutation (30) servant à faire varier les courses des pistons. Ce disque en nutation est amené à basculer pour que son inclinaison augmente sous l'action de la force résultante (F1) des poussées des pistons (28), tandis qu'il est amené à basculer pour que son inclinaison diminue sous l'action de la poussée (F) d'un piston (40) destinée à modifier cette inclinaison, et le centre de basculement du disque en nutation (30) est fixé en dehors du point d'application de la force résultante (F1) des pistons (28) par rapport au centre du bloc-cylindres (25). Le piston (40) a une forme annulaire et son point d'application est placé en dehors du point d'application de la force résultante (F1) des poussées des pistons (28) par rapport au centre (37) du bloc-cylindres (25).
PCT/JP1995/002170 1994-10-21 1995-10-20 Moteur hydraulique a vitesse variable WO1996012889A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP6256325A JPH08121320A (ja) 1994-10-21 1994-10-21 可変速油圧モータ
JP6/256325 1994-10-21

Publications (1)

Publication Number Publication Date
WO1996012889A1 true WO1996012889A1 (fr) 1996-05-02

Family

ID=17291109

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP1995/002170 WO1996012889A1 (fr) 1994-10-21 1995-10-20 Moteur hydraulique a vitesse variable

Country Status (3)

Country Link
JP (1) JPH08121320A (fr)
KR (1) KR960014680A (fr)
WO (1) WO1996012889A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11319938B2 (en) 2016-07-08 2022-05-03 Kyb Corporation Swash-plate type piston pump

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015031224A (ja) * 2013-08-05 2015-02-16 カヤバ工業株式会社 可変容量型ピストンポンプ・モータ

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62195674U (fr) * 1986-06-02 1987-12-12
JPH01247766A (ja) * 1988-03-29 1989-10-03 Teijin Seiki Co Ltd 可変速油圧モータ

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62195674U (fr) * 1986-06-02 1987-12-12
JPH01247766A (ja) * 1988-03-29 1989-10-03 Teijin Seiki Co Ltd 可変速油圧モータ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11319938B2 (en) 2016-07-08 2022-05-03 Kyb Corporation Swash-plate type piston pump
US11674505B2 (en) 2016-07-08 2023-06-13 Kyb Corporation Swash-plate type piston pump

Also Published As

Publication number Publication date
KR960014680A (ko) 1996-05-22
JPH08121320A (ja) 1996-05-14

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