JP2006242260A - Hydrostatic non-stage transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a hydrostatic non-stage transmission 10 equipped with a positioning mechanism 20 for positioning a gear-shifting operation shaft 11 in a neutral state to be provided in a state where the positioning mechanism 20 to be easily adjusted even when there is an obstacle in the vicinity of the non-stage transmission 10. <P>SOLUTION: An adjustment member 31 for changing and adjusting the positioning location of the gear-shifting operation shaft 11 by the positioning mechanism 20 is supported to a support body 22 swingably around an axis P2. An operation part 33 of the adjustment member 31 is provided with a guide member 32 for moving and guiding the adjustment member 31 by the action of a guide groove 35. A plurality of adjustment operation holes 36 and 37 arranged in the moving direction of the operation part 33 are formed at parts of the guide member 32 on which the operation part 33 of the adjustment member 31 slides. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a hydrostatic continuously variable transmission provided with a positioning mechanism for positioning a speed change operation shaft in a neutral state.

  The hydrostatic continuously variable transmission described above is disclosed in, for example, Patent Document 1, and the one disclosed in Patent Document 1 corresponds to the trunnion shaft 12 (corresponding to a transmission operation shaft) of the continuously variable transmission 7. The operating arm 19 is fixed, and the roller 21a supported by the arm 21 is applied to the cam portion 19a of the operating arm 19 by biasing the arm 21 swingable about the axis P1 by the spring 20. The positioning mechanism is configured so as to bias the trunnion shaft 12 to the neutral position N.

  In this type of continuously variable transmission, a neutral state can be stably produced by the action of the positioning mechanism, even though vibration is transmitted to the speed change operation shaft.

JP 2001-277888 A (paragraphs [0025]-[0025], FIG. 3)

  In this type of continuously variable transmission, if a manufacturing or assembly error occurs, the positioning position by the positioning mechanism is different from the actual neutral state of the speed change operation shaft. For this reason, if an adjustment member that can be manipulated manually to change and adjust the positioning position of the speed change operation shaft by the positioning mechanism is provided, the positioning position by the positioning mechanism can be changed to the actual neutral state of the speed change operation shaft even if a manufacturing or assembly error occurs. So that the neutral state can be stably displayed.

In this type of positioning mechanism, a guide member is provided for sliding the adjustment member along the guide groove, and when the adjustment work is actually performed, the adjustment member is moved little by little so as not to move too much. In addition, it is general that the adjusting member is configured to adopt an adjusting method in which a striking in the direction along the moving direction is applied to the adjusting member.
However, when the positioning mechanism of this structure is adopted, when various devices and members exist in the vicinity of the continuously variable transmission, such as when the continuously variable transmission is installed deep in the vehicle, the devices and members are There are cases where it becomes difficult or impossible to use the impact tool due to an obstacle, making it difficult or impossible to adopt the adjustment method of hitting the adjustment member.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a hydrostatic continuously variable transmission that can easily adjust a positioning mechanism regardless of the state of the installation location of the continuously variable transmission.

In the first invention, in the hydrostatic continuously variable transmission provided with a positioning mechanism for positioning the speed change operation shaft in a neutral state,
A guide member is provided for moving and guiding an adjustment member that can be manually moved and changed by a guide groove to change and adjust the positioning position of the speed change operation shaft by the positioning mechanism,
A plurality of adjustment operation holes arranged in the moving direction of the operation portion are provided in a portion where the operation portion of the adjustment member of the guide member slides.

  That is, a screwdriver or a bar-shaped sheet metal member is used as an operation tool, and this operation tool is inserted in the vicinity of the operation unit in a direction intersecting the moving direction of the operation unit from the front of the operation unit of the adjustment member, and the distal end side of the operation tool. Is inserted into the adjustment operation hole adjacent to the operation part of the plurality of adjustment operation holes and operated so as to press the operation part. The adjusting member can be moved by applying force.

  Therefore, according to the first aspect of the invention, the adjustment member is operated using an appropriate operation tool that can be inserted into the adjustment operation hole and inserted in the direction intersecting the moving direction of the operation portion of the adjustment member, such as a driver. Regardless of where it is installed, such as in a deep part of the vehicle, the neutralization state can be stably displayed by adjusting the speed change operation shaft to be properly positioned by the positioning mechanism. I was able to do it.

  According to the second aspect of the invention, in the configuration of the first aspect of the invention, the adjustment operation holes are located on both lateral sides of the guide groove and the plurality of adjustment operations are located on one lateral side of the guide groove. A pair of adjustment operation holes adjacent to each other in the hole and one of the plurality of adjustment operation holes located on the other side of the guide groove are arranged in a direction crossing the guide groove.

  When adjusting operation holes that are located only on either side of the guide groove are adopted, the adjustment operation holes should be arranged at a small arrangement pitch so that the adjusting member can be operated with a small stroke. In this case, the size of each adjustment operation hole in the direction of movement of the operation portion is reduced, and a large-diameter operation tool cannot be used. On the other hand, in the second invention, the adjustment operation holes are arranged on both lateral sides of the guide groove, and a pair of adjustment operation holes adjacent to each other in the adjustment operation hole located on one lateral side of the guide groove. And one of a plurality of adjustment operation holes located on the other side of the guide groove are aligned in the guide groove crossing direction. Even if the operation tool is enlarged so as to be engaged, the adjustment operation holes as a whole are arranged at a small arrangement pitch with respect to the size of the adjustment operation holes.

  Therefore, according to the second aspect of the present invention, the adjustment member is moved by small strokes by using the adjustment operation holes on both lateral sides of the guide grooves that are arranged at a small arrangement pitch as a whole. Then, the adjustment member is finely adjusted so that the positioning position of the speed change operation shaft by the positioning mechanism is finely changed, so that the neutral state can be accurately displayed. In addition, the size of each adjustment operation hole can be increased, and adjustment can be performed reliably and easily using a large-diameter operation tool.

Embodiments of the present invention will be described below with reference to the drawings.
As shown in FIG. 1, a driving part having a pair of left and right steering operations and a front wheel 1 that can be driven, a pair of left and right driving rear wheels 2, and an engine 3 located in the front part of the vehicle body, A link mechanism 6 is provided between the front and rear wheels of a vehicle body frame 5 of a self-propelled vehicle body having a driver section having a driver seat 4 located at the rear, and this mission case is formed in a transmission case 7 constituting the rear portion of the vehicle body frame 5. A tractor is configured by providing a lift arm 8 supported on both sides of the rear part of the rear part 7 so as to be swingable up and down, and a power take-out shaft 9 projecting rearward from the rear part of the transmission case 7.

  In this tractor, a mowing device (not shown) is connected between the front and rear wheels of the vehicle body frame 5 so as to be movable up and down by the link mechanism 6 to constitute a riding mower, or a rotary tiller (not shown) at the rear of the vehicle body. And a pair of left and right lift arms 8 are connected so as to be moved up and down, and the driving force of the engine 3 is transmitted from the power take-off shaft 9 to the rotary tiller. It is something to do.

A hydrostatic continuously variable transmission 10 is provided on the front side of the transmission case 7. The hydrostatic continuously variable transmission 10 is driven by an axial plunger type variable displacement type hydraulic pump (not shown) configured to receive the driving force of the engine 3 and pressure oil from the hydraulic pump. And an axial plunger type hydraulic motor (not shown) configured to output to a traveling mission (not shown) located inside the mission case 7. As shown in FIG. 2, when the speed change operation shaft 11 with the lateral one side face of the continuously variable transmission 10 is turned, the swash plate angle of the hydraulic pump is changed. The apparatus 10 enters a forward drive state so that the driving force from the engine 3 is converted into a forward driving force and output to the mission case 7, or the driving force from the engine 3 is converted into a backward driving force. The engine drive force is steplessly changed and output to the transmission case 7 in both the forward drive state and the reverse drive state. Further, when the speed change operation shaft 11 is operated in a neutral state, the continuously variable transmission 10 is in a neutral state so as to stop the output to the transmission case 7 in order to stop the front and rear wheels 1 and 2.
An operation arm 12 connected to the speed change operation shaft 11 so as to be integrally rotatable is for linking the speed change operation shaft 11 to a speed change pedal (not shown).

  As shown in FIG. 2, a positioning mechanism 20 provided with a positioning spring 29 and the like is provided on the side surface of the hydrostatic continuously variable transmission 10 where the speed change operation shaft 11 is located.

  As shown in FIGS. 2 and 3, the positioning mechanism 20 is located on the base end side of the speed change operation shaft 11 with respect to the operation arm 12 and is located in the case 10 a of the continuously variable transmission 10. The positioning arm 25 in which a support shaft 24 is supported via a ring body 23 on a positioning rotary cam 21 connected to a part so as to be integrally rotatable and a cylindrical support body 22 included in a case 10 a of the continuously variable transmission 10. , An operation of the end of the support shaft 24 opposite to the side to which the positioning arm 25 is connected, and the end of the continuously variable transmission 10 located outside the case 10a so as to be integrally rotatable. The positioning spring 29 is connected to a member 26, a spring connector 27 provided on the operation member 26, and a spring support 28 fixed to the continuously variable transmission 10.

  The ring body 23 is rotatably fitted to the support body 22. However, the end portion of the arm-shaped adjusting member 31 extending from one side surface of the ring body 23 so as to be integrally rotatable is fastened and fixed to the guide member 32 fixed to the continuously variable transmission 10 by the screw body 33. Thus, the ring body 23 is fixed to the support body 22 so as not to rotate, and the positioning arm 25 is supported in a swingable manner around the axis P1 of the support shaft 24. Yes. As shown in FIG. 4, the positioning rotary cam 21 is provided with a cam peripheral surface 21a formed in a substantially V shape when viewed in the direction along the rotational axis of the speed change operation shaft 11, and abuts against the cam peripheral surface 21a. The positioning arm 25 is provided with an action portion 25a composed of an idle roller that acts. The positioning spring 29 swings and biases the operating member 26 around the axis P1 of the support shaft 24, and swings and biases the positioning arm 25 toward the positioning rotary cam 21, thereby causing the action portion 25a of the positioning arm 25 to move. The positioning rotary cam 21 is biased against the cam peripheral surface 21a.

  That is, the positioning mechanism 20 urges the acting portion 25a of the positioning arm 25 against the cam peripheral surface 21a of the positioning rotary cam 21 by the positioning spring 29, and urges the speed change operation shaft 11 in a neutral state by the shape of the cam peripheral surface 21a. The transmission operation shaft 11 is positioned in a neutral state by energizing it to return to the neutral state, so that the continuously variable transmission 10 is in a neutral state regardless of vibration transmitted from the swash plate (not shown) of the hydraulic motor to the transmission operation shaft 11. Is made to appear stably. Further, when the speed change operation of the continuously variable transmission 10 is performed, the positioning mechanism 20 causes the positioning arm 25 to swing against the positioning spring 29 by the positioning rotary cam 21 that rotates together with the speed change operation shaft 11. The speed change operation shaft 11 is allowed to be rotated.

  A positioning adjustment mechanism 30 is constituted by each of the ring body 23, the adjustment member 31, and the guide member 32. The positioning adjustment mechanism 30 is for changing and adjusting the positioning position of the speed change operation shaft 11 by the positioning mechanism 20 by manual operation, and is configured in detail as follows.

  As shown in FIG. 4 and the like, the ring body 23 includes a rotation shaft core P2 in which the ring body 23 rotates with respect to the support body 22, and a support shaft hole 23a in which the hole shaft core is eccentric. The support shaft 24 is rotatably supported by the support shaft hole 23a. As a result, the ring body 23 is rotatably supported by the support body 22 in a state where the rotation axis P2 of the ring body 23 and the rotation axis P1 of the positioning arm 25 are displaced from each other. It is in the state. Further, the ring body 23 is in a state in which the positioning arm 25 is supported so as to be swingable around the axis P1.

  A guide groove 35 configured to insert a screw shaft 34 provided to attach the screw body 33 to the adjustment member 31 is provided in the guide member 32, and both lateral sides of the guide groove 35 of the guide member 32. A plurality of adjustment operation holes 36 and 37 are provided along the guide groove 35 in the moving direction of the screw body 33 in a portion where the screw body 33 slides. Each of the adjustment operation holes 36 and 37 is formed in a notch shape that opens toward the guide groove 35 and communicates with the guide groove 35. In addition, between the adjustment operation holes 36 and 36 adjacent to each other in the plurality of adjustment operation holes 36 located on the lateral side of the guide groove 35 among the adjustment operation holes 36 and 37, the adjustment operation holes 36 and 36, Each of the adjustment operation holes 36 and 37 is arranged in a state in which one of a plurality of adjustment operation holes 37 positioned on the other side of the guide groove 35 is aligned in a direction crossing the guide groove 35.

  That is, the screw body 33 is an operation portion of the adjustment member 31, and the tightening and fixing of the adjustment member 31 to the guide member 32 by the screw body 33 is released, and the screw body 33 is moved along the guide groove 35. When the screw body 33 is moved to a predetermined operation position, the screw body 33 is rotated, and the adjustment member 31 is fastened and fixed to the guide member 32 so as not to be returned by the positioning spring 29. Then, the adjustment member 31 can be moved and adjusted while being guided by the guide groove 35 around the rotation axis P2 of the ring body 23, and the ring body 23 is rotated around the axis P2 to support the positioning arm 25. 24 is moved and adjusted with the rotation axis P2 of the ring body 23 as the movement center. As a result, the swing axis P1 of the positioning arm 25 is moved and adjusted with the rotation axis P2 of the ring body 32 as the movement center. The action portion 25 a of the arm 25 is moved and adjusted in the circumferential direction of the speed change operation shaft 11. Therefore, when the adjusting member 31 is swung around the shaft core P2 along the guide groove 35 along the guide member 32, the positioning adjusting mechanism 30 adjusts the positioning position of the speed change operation shaft 11 by the positioning mechanism 20. It is adapted to change and adjust to those corresponding to 31 adjustment positions.

  In order to swing the adjustment member 31 so as to adjust the positioning adjustment mechanism 30, the screw body 33 can be moved by operating the screw body 33 by hitting the screw body 33 in the direction along the moving direction thereof. In addition, when another device or member located in the vicinity of the continuously variable transmission 10 becomes an obstacle and it is difficult or impossible to use the impact tool, an appropriate rod-like operation tool such as a screwdriver is inserted from the front of the screw body 33. The tip of the operation tool is inserted in a direction crossing the moving direction of the screw body 33, and the adjustment operation hole 36 on one side of the guide groove adjacent to the screw body 33 and the adjustment operation hole 37 on the other side of the guide groove are engaged. When the distal end portion of the operation tool comes into contact with the guide member 32 inside the adjustment operation holes 36 and 37, the operation tool is operated so that the distal end side of the operation tool presses against the screw body 33 with the guide member 32 as a reaction point. Also by operating the tool, the adjusting member 31 can be swung by moving the screw 33.

  As shown in FIG. 5, the driver seat 4 is rotatably connected to a seat side mounting member 40 connected to the lower portion of the driver seat 4, and an upper end side is rotatably connected to a vehicle body side support member 41 provided on the self-propelled vehicle body. The lower end side is supported by the vehicle body side support member 41 via a pair of front and rear swing connection links 42 and 43 that are rotatably connected to the vehicle body side support member 41. A front cushion member 44 made of a resin block disposed between the pair of front and rear swing connecting links 42 and 43, and a rear cushion member made of a resin block disposed rearward of the rear swing connecting link 43. 45 is fixed to the vehicle body side support member 41. The height of the rear cushion material 45 is set lower than the height of the front cushion material 44.

  That is, in the case of a driver who is relatively light in weight, as shown in FIG. 5 (a), the seat-side mounting member 40 contacts only the front cushion member 44 of the front cushion member 44 and the rear cushion member 45. It is received and supported, and can be seated while being cushioned by the front cushion material 44 while making it difficult to feel a stickiness. In the case of a driver with heavy weight, as shown in FIG. 5 (b), the front cushion member 44 is greatly deformed and the seat side mounting member 40 comes into contact with and is supported by the front cushion member 44 and the rear cushion member 45. The seat can be seated while being cushioned by the front cushion member 44 and the rear cushion member 45 and less likely to feel a stickiness.

Side view of the entire tractor Side view of positioning mechanism Longitudinal front view of positioning mechanism (A) is an explanatory view of a state in which the adjustment member of the positioning function is adjusted to one end side of the guide groove, (b) is an explanatory view of a state in which the adjustment member of the positioning function is adjusted to the other end side of the guide groove, (A) is a side view of the driver seat support structure in a state where a lightweight driver is seated; (B) is a side view of the driver seat support structure in a state where a heavy driver is seated;

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Shifting operation shaft 20 Positioning mechanism 31 Adjustment member 32 Guide member 33 Adjustment member operation part 35 Guide grooves 36 and 37 Adjustment operation hole

Claims (2)

A hydrostatic continuously variable transmission provided with a positioning mechanism for positioning a speed change operation shaft in a neutral state,
A guide member is provided for moving and guiding an adjustment member that can be manually moved and changed by a guide groove to change and adjust the positioning position of the speed change operation shaft by the positioning mechanism,
A hydrostatic continuously variable transmission in which a plurality of adjustment operation holes arranged in the moving direction of the operation portion are provided in a portion of the guide member where the operation portion of the adjustment member slides.   The adjustment operation holes are located on both sides of the guide groove, and between the adjacent adjustment operation holes in the plurality of adjustment operation holes located on one side of the guide groove, and between the guide grooves 2. The hydrostatic continuously variable transmission according to claim 1, wherein one of the plurality of adjusting operation holes located on the other side is arranged in a direction crossing the guide groove.

Images