JPH04132256U - Continuously variable transmission operating mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an operating mechanism that can hold a swash plate at any angle with a small force. [Structure] Resistance means 31 includes an electric motor 10 that rotationally drives the rotating shaft of the swash plate 4 in accordance with the rotational displacement of the operating lever 14, and provides frictional resistance to the rotation of the operating lever 14;
33 and 34.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention operates a hydraulic continuously variable transmission that combines a hydraulic pump and a hydraulic motor. Concerning improvements in means.

0002

[Conventional technology]

The hydraulic motor is driven by the oil discharged from the swash plate type hydraulic pump, and the input shaft of the hydraulic pump is rotated. The rotation is decelerated and extracted as the rotation of the output shaft of the hydraulic motor, and the rotation of the hydraulic pump is Continuously variable speed reduction ratio that allows you to change the reduction ratio steplessly by changing the angle of the swash plate. The speed machine is known.

0003

[Problems to be devised]

In this case, the swash plate can be operated by rotating an operating lever connected to the rotation shaft of the swash plate. However, the load acting on the swash plate varies depending on the operating conditions of the hydraulic pump. In some cases, a large holding force was required to maintain the swash plate at a desired angle.

0004 However, when rotating the control lever, this holding force acts as resistance. Therefore, if the holding force is increased, the force required for operation will also increase accordingly.

[0005] This invention was made to solve the above problems, and allows the swash plate to be moved freely with a small force. The purpose is to provide an operating mechanism that can be held at an angle of .

[0006]

[Means to achieve the task]

This invention uses the discharge oil of a variable capacity swash plate hydraulic pump to rotate a hydraulic motor. The operation of a continuously variable transmission in which the angle of the swash plate of the continuously variable transmission is changed by operating a control lever. In the operating mechanism, an electric current is used to rotate the rotating shaft of the swash plate in accordance with the rotational displacement of the operating lever. It is equipped with a motive force and a resistance means that provides frictional resistance to the rotation of the operation lever. There is.

[0007]

[Effect]

When the operating lever is rotated, the detection means detects its displacement position, and the detected displacement The control means controls the drive current of the electric motor based on the position, and the electric motor operates according to the drive current. Rotate and displace the swash plate. The operating lever only directs the rotation angle of the swash plate; Since it is not directly driven, it can be operated with a constant small operating force.

[0008] Therefore, by providing resistance to the rotation of the operating lever, the resistance means provides a small amount of resistance. The holding force can hold the swash plate at a set angle.

[0009]

【Example】

An embodiment of the present invention is shown in FIGS. 1 and 2.

0010 In Fig. 1, 1 is a housing of a hydraulic continuously variable transmission, and 2 is an input shaft 3 inside it. The cylinder block of the hydraulic pump is rotatably supported through the cylinder block, 4 is a swash plate. .

[0011] The cylinder block 3 includes a plurality of cylinders 6 formed in the axial direction, and each cylinder The base end of the piston 7, which freely slides and projects from the cylinder 6, comes into sliding contact with the swash plate 4.

0012 At the end of the cylinder block 2 opposite to the swash plate 4, there is a suction port that communicates with each cylinder 6. A pump in which a valve plate 5 having an inlet port and a discharge port is in sliding contact with each other to seal the housing 1. The cover 19 has a suction passage and a discharge passage communicating with these suction ports and discharge ports. It is formed.

[0013] As a result, when the rotating shaft 3 is driven to rotate, the piston 7 protrudes from the cylinder 6. expands and contracts according to the change in the distance between the swash plate 4 and the cylinder 6, and the suction passage is activated during the expansion stroke. Oil is sucked into the cylinder 6 from the suction port of the valve plate 5, and during the contraction stroke, this hydraulic oil is The hydraulic pressure (not shown) is pressurized and discharged into the discharge passage through the discharge port of the valve plate 5. Rotate the motor.

[0014] The swash plate 4 is rotatably supported by the housing 1 around a rotation axis 4A orthogonal to the rotation axis 3. held. 8 is a bearing for this purpose. In addition, the swash plate 4 has a tooth surface formed on the outer periphery. The swash plate gear 9 thus formed is integrally formed on the rotating shaft 4A.

[0015] An electric motor 10 is attached to the outside of the housing 1. Rotating shaft 1 of electric motor 10 1 protrudes freely into the housing 1 and has a drive gear 12 attached to its tip. As shown in FIG. 2, it is meshed with the swash plate gear 9.

[0016] Also, facing the end face of the swash plate gear 9, the shaft 13 is freely rotatable on the same axis as the swash plate gear 9. Supported by Uzing 1. This shaft 13 passes through a cover 31 fixed to the housing 1. The operating lever 14 is connected to the protruding end via the key 35, and the operating lever 14 is connected to the protruding end through the key 35. match. This operating lever 14 can be rotated manually via a link 24 shown in FIG. made.

[0017] An arm 15 is fixed to the shaft 13 in parallel to the end surface of the swash plate gear 9. Arm 15 is It is rotatably supported by the ring 32. In addition, the bearing 32 and the cover 31 A spring 33 is interposed between the two. Spring 33 is operated via shaft 13 The lever 12 is urged toward the cover 31, and the disk 3 fixed to the operating lever 12 4 to the cover 31. The cover 31, spring 33 and disc 34 are It constitutes a resistance means that provides frictional resistance to the rotational displacement of the operating lever 14.

[0018] On the end face of the swash plate gear 9, there are stoppers 16A and 1 opposite to each other in both rotational directions of the arm 15. 6B are formed with a predetermined clearance between them and the arm 15, respectively.

[0019] Each stopper 16A and 16B is biased by a spring 17 and directed toward the arm 15. Pistons 20A and 20B that protrude from each other are housed in a freely slidable manner. and, A limit switch 2 that is turned ON by being pressed by the base ends of these pistons 20A and 20B 1A and 21B are fixed to the end face of the swash plate gear 9, respectively.

[0020] When the limit switch 21A is in the ON state, the motor 10 rotates in the direction of the arrow in FIG. The electric motor 10 is energized to rotate the swash plate gear 9 clockwise in the figure. let In addition, when the limit switch 21B is in the ON state, the electric motor 10 is The electric motor 10 is energized so that it rotates in the opposite direction, thereby causing the swash plate gear 9 to rotate counterclockwise. Rotate around.

[0021] In addition, limit switches 21A and 21B are both connected to pistons 20A and 20B. It remains ON only while being pressed, and from the pressing force of pistons 20A and 20B. When released, it switches to OFF.

[0022] Furthermore, when the swash plate gear 9 rotates to a predetermined angle, the swash plate gear 9 contact the steps 25A and 25B formed on the end face of the motor 10 to cut off the power to the motor 10. limit switches 22A and 22B are mounted in symmetrical positions.

[0023] Also, the contact points are applied to the stepped portions 25A and 25B of the swash plate gear 9 rotated to a predetermined rotation angle. Protrusions 23A and 23B that touch and prevent further rotation of the swash plate gear 9 are attached to the housing. Fixedly installed in G1.

[0024] Note that the rotation angle at which the swash plate gear 9 contacts the protrusions 23A and 23B is determined by the limit switch. The rotation angle is set slightly larger than the rotation angle at which the switches 22A and 22B switch.

[0025] Next, the effect will be explained.

[0026] When no operating force is applied to the operating lever 14, the pistons 20A and 20B biased by the spring 17 hold it at a neutral position where δ ₁ and δ ₂ in FIG. 2 are equal, and the hydraulic pump pumps hydraulic oil. There is no discharge and the output shaft of the hydraulic motor does not rotate.

[0027] Further, the disk 34 is brought into close contact with the cover 31 by the spring 33, and the disk 34 is brought into close contact with the cover 31 by the spring 33. 4 and the cover 31 acts as a holding force for the operating lever 14. Therefore Therefore, the operating lever 14 is held at this neutral position unless an operating force is applied.

[0028] Note that since the shaft 13 is not connected to the rotating shaft 4A, regardless of the angle of the swash plate 4, The load of the swash plate 4 is not transmitted to the operating lever 14. Therefore, the operating lever The frictional resistance between the cover 31 and the disk 34 that holds the The size should be set to be large enough to hold the operating lever 14 against the pressing force of stomach.

[0029] If you want to rotate the swash plate 4 clockwise in FIG. and rotate the operating lever 14 in the same direction. This operation is carried out by This is done against the repulsive force of the pulling 17 and the frictional resistance between the disk 34 and the cover 31. However, as mentioned above, since the load of the swash plate 4 does not act on the operating lever 14, the amount required for operation is reduced. The force exerted is small and constant regardless of the angle of the swash plate 4. .

[0030] By rotating the operating lever 14, the arm 15 is moved against the spring 17. Retract the piston 20A, and the base end of the piston 20A presses the limit switch 21A. do. As a result, when the limit switch 21A is turned ON, the electric motor 10 rotates in the direction of the arrow in the figure, and the swash plate 4 is rotated through the drive gear 12 and the swash plate gear 9 as shown in FIG. Rotate clockwise. Then, due to the rotation of the swash plate gear 9, the limit switch 2 When 1A is turned off, the swash plate 4 stops rotating.

[0031] On the other hand, if you continue to apply operating force to the operating lever 14 with respect to the rotation of the swash plate 4, the limit will be reached. Since the switch 21A remains ON, the swash plate 4 also continues to rotate.

[0032] In this way, if the operating lever 14 is rotated by the angle α, the swash plate 4 will also rotate at the angle α. and rotate.

[0033] The counterclockwise rotation of the swash plate 4 is performed in the same manner. That is, if the operating lever 14 is Rotate counterclockwise and turn on limit switch 21B via piston 20B. When switched, the electric motor 10 rotates in the opposite direction to the arrow in the figure, and the drive gear 12 and swash plate gear The swash plate 4 starts rotating via the gear 9. Then, set the operating lever at the desired angle β. When the rotation operation of 14 is stopped, the swash plate 4 also rotates by the same angle β and stops rotating. .

[0034] In this way, the swash plate 4 can be moved to any angle by simply applying a small constant force to the operating lever 14. Can be adjusted at any time. Also, after adjusting the angle of the swash plate, apply the operating force again. Unless otherwise specified, the operating lever 14 will remain at the same position due to the frictional resistance between the disc 34 and the cover 31. , and the swash plate 4 is also held at the same angle.

[0035] Note that the angle change of the swash plate 4 is such that the stepped portion 25A (25B) of the swash plate gear 9 is It is regulated by contacting the protrusion 23A (23B) fixed to the Before the rotation of the swash plate 4 is blocked, the step portion 25A (25B) is connected to the limit switch 2. 2A (22B) and switches the limit switch 22A (22B) to turn the motor 1 on. Cut off the power to 0.

[0036] Therefore, even after the angle of the swash plate 4 has changed to its full extent, the electric motor 10 is not energized. There is no risk that the electric motor 10 will overheat due to this.

[0037] In addition, in the unlikely event that the electric motor 10 does not operate due to, for example, a problem with the electrical system, If so, by continuing to operate the operating lever 14, the arm 15 will move according to the direction of rotation. comes into contact with the stopper 16A or 16B, and thereby the operating lever 14 directly moves the swash plate 4. It is possible to drive the rotation.

[0038]

[Effect of the idea]

As described above, in the present invention, the electric motor operates on the rotation axis of the swash plate in response to the rotational displacement of the operating lever. While driving the control lever, it is also equipped with a resistance means that provides frictional resistance to the rotation of the operating lever. The load of the swash plate does not act on the control lever, and the control lever can always be operated with a constant, small operating force. can be made.

[0039] In addition, since the resistance means provides resistance to the rotation of the operating lever, a special holding operation is not required. The swash plate can be held at any angle without any movement.

[Brief explanation of drawings]

FIG. 1 is a sectional view of essential parts of a continuously variable transmission showing an embodiment of the present invention.

FIG. 2 is a view taken along the line A-A in FIG. 1;

[Explanation of symbols]

4 Swash plate 4A rotation axis 10 Electric motor 14 Operation lever 31 Cover 33 Spring 34 Disc

Claims (1)

[Scope of utility model registration request] 1. An operating mechanism for a continuously variable transmission in which the angle of the swash plate of the continuously variable transmission, which rotationally drives a hydraulic motor using oil discharged from a variable capacity swash plate type hydraulic pump, is changed by operating a control lever, An operation mechanism for a continuously variable transmission, comprising an electric motor that rotationally drives a rotating shaft of a swash plate in response to rotational displacement of an operation lever, and a resistance means that provides frictional resistance to rotation of the operation lever. .