JPH0710930Y2 - Gear shift lever mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a gearshift lever mounting device applied to a work vehicle such as a riding lawn mower equipped with a gearbox.

(Prior Art) In a conventional gear shift lever mounting device, a rotary shaft is mounted on a first holder and a second holder fixed to a vehicle body frame side, and a boss is rotatably fitted on the rotary shaft. Friction washers are respectively interposed between the boss and the first holder and between the boss and the second holder, and a nut and a nut plate are screwed into the tip of the rotary shaft. There is one in which a spring is interposed between the second holder and the second holder, and a transmission lever is attached to the boss (US Pat. No. 4,496,035).

In the case of this gear shift lever mounting device, the nut plate and the second
By the elastic force of the spring inserted between the holder of
The first holder bends in the rotation axis direction, and the rotation axis moves in the same direction. At this time, the friction washers arranged at both ends of the boss will be pressed against both end faces of the boss.
A constant operating load due to friction is applied to the speed change lever.

(Problems to be solved by the invention) However, since the bosses and springs fitted to the rotary shaft are arranged in a row along the axial direction, the size of the entire device increases and the adjustment range of the operating load is narrow. There was a problem.

Further, there is a problem that it is difficult to assemble the shift lever alone, and it is difficult to adjust the operating load.

An object of the present invention is to provide a gear shift lever mounting device that can be downsized while ensuring a sufficient adjustment range for the operating load of the gear shift lever and that can be assembled as a single gear shift lever.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention has a gear shift lever connected to a rotation shaft, and the rotation shaft rotatably attached to a holder attachable to and detachable from a body frame. Yes, a boss is fitted to the rotary shaft, the boss is fixed to the holder, a collar is fitted to the boss so as to be movable in the axial direction, and a flange portion facing the holder is It is provided on the collar, a spring is interposed between the flange portion of the collar and the holder, and a nut is screwed into the tip of the rotary shaft, and the friction washer is pressed against the collar by the nut. ing.

(Operation) As described above, the boss is fitted to the rotary shaft, one end of the boss is fixed to the holder, and the collar is fitted to the holder so as to be movable in the axial direction. A flange portion facing the holder is provided, and a spring is interposed between the flange portion of the collar and the holder. That is, the boss is fitted on the rotating shaft, and the spring is in a state of being fitted on the boss. As a result, the length of the rotating shaft can be shortened and the spring does not protrude in the axial direction. Further, the adjustment range of the operation load of the shift lever is widened. Furthermore, since the holder is attachable / detachable to / from the vehicle body frame, the gear shift lever attaching device can be assembled as a single unit.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 5 is a side view showing a riding lawn mower equipped with a gear shift lever mounting device according to an embodiment of the present invention, wherein 1 is a body of the riding lawn mower, 2 is an engine arranged under a seat 3, and 4 is an engine. Indicate gear shift levers for traveling provided on the side portions of the seat 3, respectively. The speed change lever 4 is attached to a speed change lever mounting device 5 which is rotated by the operation of the lever 4.
Is connected to a hydraulic continuously variable transmission 7 via a link mechanism 6 (see FIG. 6). By operating the speed change lever 4 before and after the neutral position (neutral position), the inclination of the swash plate (not shown) of the drive pump in the hydraulic continuously variable transmission 7 is controlled and the traveling speed and direction of the vehicle body 1 are controlled. It is controlled. Further, a cutter deck 8 is provided in the lower portion of the vehicle body 1, and a cutter blade 44 that is rotated by the input shaft 34 of the hydraulic continuously variable transmission 7 is rotatably attached to the inside of the cutter deck 8. The four deck rollers 46 that maintain the lowest height are pivotally attached to the front, rear, left, and right of the cutter deck 8 so that the lawn can be cut into a strip while traveling at a low speed. The gear shift lever mounting device 5
A guide panel (not shown) for guiding the speed change lever 4 is provided diagonally above. On the guide panel, the car body 1
On the other hand, an operation guide groove (not shown) extending in the front-rear direction is formed. The engine 2 and the battery 48 are fixed to the upper portion of the vehicle body frame 47, and these are covered with a cover 49. The steering wheel 50 steers the front wheels 51.
Wheels 52 are fixed to both ends of the axle 33. An oil tank 55 is arranged above the hydraulic continuously variable transmission 7.

As shown in FIGS. 5, 6, and 7, the shift lever mounting device 5 includes a change rod 9 that forms a link mechanism 6.
And a control arm connected to the rod 9 with a pin 10
11 is connected to the control shaft 7a of the hydraulic continuously variable transmission 7. The control shaft 7a is a hydraulic continuously variable transmission 7
Sticks out at the top of. The control arm 11 is fixed to the control shaft 7a by welding or the like and rotates together with the control shaft 7a. Therefore, a shift operation for moving the shift lever 4 back and forth from the neutral position (neutral position) is transmitted to the control shaft 7a via the shift lever mounting device 5 and the link mechanism 6, and the control shaft 7a is rotated to cause the above-mentioned shift operation. The traveling speed and direction of the vehicle body 1 are controlled by changing the inclination of a swash plate (not shown).

On the other hand, as shown in FIG. 5, FIG. 6 and FIG. 7, the brake pedal 12 together with the rotating member 13 is located on the OFF position (release position of stepping operation) side in FIG. 1 (arrow A in FIG. 7). (In the direction indicated by the arrow), the rotating member 13 moves the return rod 14,
A neutral return member 18 is connected via a rotating member 15, a return rod 16 and a pin 17. The neutral return member 18 is bent at a bent portion 18a to avoid interference with the change rod 9 (see FIG. 8), and its lower side portion 18b is connected to the return rod 16 by a pin 17. . The upper portion 18c of the neutral return member 18 is rotatably supported by a pivot 21 that is erected on a bracket 20 fixed to the upper portion of a base plate 19 of the hydraulic continuously variable transmission 7 with bolts 26. Therefore, when the brake pedal 12 is depressed from the OFF position to the ON position (depression operation position), the neutral return member 18 is rotated from the original position shown by the chain line in FIG. 7 to the return position shown by the solid line. . Further, when the depression operation of the brake pedal 12 is released, the pedal 12 is returned to the OFF position by the urging force of a return spring (not shown), so that the neutral return member 18 also returns to the original position. The bracket 20 has three long holes 20.
A is provided, and the bracket 20 is fixed to the upper portion of the base plate 19 of the hydraulic continuously variable transmission 7 by screwing a bolt inserted into the long hole 20a into a female screw (not shown) of the base plate 19.

As shown in FIG. 7, the control arm 11 has
Two long grooves 22 and 23 are provided. On the other hand, the neutral return member 18 is provided with two pins 24, 25 corresponding to the long grooves 22, 23, and when the neutral return member 18 is rotated to the return position, the two pins 24, 25 are rotated. At least one of the control arms 11 engages with the ends of the corresponding long grooves 22 and 23.
The two long grooves 22 and 23 and the two pins 24 and 25 are arranged so as to return the to the neutral position. It should be noted that at least one of the pins 24, 25 is configured to contact the opposite ends of the two long grooves 22, 23 when the control arm 11 is returned to the neutral position.

FIG. 1 is a longitudinal sectional view of the gear shift lever mounting device, and FIG. 2 is a front view of the gear shift lever mounting device. The shift lever 4 is connected to the change lever arm 30. As shown in FIG. 2, the change lever arm 30 includes a change arm body 31.
A bolt 33 that rotatably supports the boss 32 on the change arm body 31, and a spring fitted around the boss 32.
It consists of 34 and. One end of the shift lever 4 is fixed to the boss 32. One end of the spring 34 is the change arm body
31 and the other end of the spring 34 is engaged with the speed change lever 4. The gear shift lever 4 is biased in a fixed direction by the elastic force of the spring 34.

A rotary shaft 35 is welded to the change arm body 31 of the change lever arm 30, and the rotary shaft 35 is a friction washer.
It is rotatably attached to a holder 37 via 36. Second
As shown in the figure, the holder 37 is provided with a through hole 38, and the male screw 57 is screwed into the through hole 38 to attach the holder 37 to the vehicle body frame.
It is fixed to 47 via bracket 56. A cylindrical boss 38 is fitted on the rotary shaft 35, and one end of the boss 38 is welded to the holder 37. A guide groove 38a is provided on the outer periphery of the boss 38 along the axial direction. A cylindrical collar 39 is fitted on the boss 38 so as to be movable in the axial direction, and a holder is provided at one end of the collar 39.
A flange portion 39a facing the 37 is provided. On the inner circumference of the collar 39, a protrusion 39b that fits into the guide groove 38a of the boss 38 is provided. A spring 40 is interposed between the flange portion 39a of the collar 39 and the holder 37. A washer 41 is sandwiched between one end of the spring 40 and the flange portion 39a, and a washer is provided between the other end of the spring 40 and the holder 37.
42 is sandwiched.

The tip of the rotary shaft is threaded, and the nut 43 and plate nut 44 are screwed into the tip, and the plate washer 44 causes the friction washer 45 to
Pressed to the 39 side, the plate nut 44 is kept in a fixed position by the nut 43. Further, each member such as the rotating shaft 35 and the nut 43 attached to the shaft 35 is covered with a cover 46 fixed to the holder 37.

With the above construction, the elastic force of the spring 40 pushes the collar 39 in the L direction in FIG. 1, the collar 39 pushes the friction washer 45 in the same direction, and the friction washer 45 pushes the nut 43 and the plate nut 44. push. When the nut 43 and the plate nut 44 are pushed, the change lever arm 30 is pulled in the L direction, and the change arm body 31 of the change lever arm 30 is moved to the friction washer 36.
Then, the friction washer 36 is pressed against the holder 37. As a result of the above action, friction is generated between the collar 39 and the plate nut 44, and between the change lever arm 30 and the holder 37. This determines the operating load of the speed change lever 4. The operation load is adjusted by the screwing amount of the plate nut 44, and the adjusted position of the plate nut 44 can be fixed by tightening the nut 43. Also, collar 39 and holder
The collar 39 is spline-coupled as described above, so that the collar 39 does not rotate following the operation of the speed change lever 4, but can move in the axial direction when adjusting the operating load.

Next, the function and effect of this embodiment will be described.

A boss 38 is fitted to the rotary shaft 35, one end of the boss 38 is welded to a holder 37, and a collar 39 is fitted to the holder 37 so as to be movable in the axial direction. A flange portion 39a facing the holder 37 is provided, and a spring 40 is interposed between the flange portion 39a of the collar 39 and the holder 37. That is, the boss 38 is fitted on the rotary shaft 35, and the spring 40 is in a state of being fitted on the boss 38. As a result, the length of the rotary shaft 35 can be shortened, and
Spring 40 does not project in the axial direction. Therefore the boss
Compared with the case where the 38 and the spring 40 are arranged in a column along the axial direction, the size of the device can be significantly reduced. Further, the adjustment range of the operation load of the shift lever 4 is widened.

Further, the holder 37 is provided with a plurality of through holes 38.
The holder 37 is fixed to the vehicle body frame 47 via the bracket 56 by screwing the male screw 57 from the. That is, the holder 37 is attachable to and detachable from the vehicle body frame 47. As a result, the gear shift lever mounting device 5 can be assembled as a single unit. Therefore, the assemblability is improved, and the operation load can be adjusted without incorporating it into the vehicle body frame 47.

Further, since the cover 46 is attached, it is possible to prevent water and mud from entering.

FIG. 4 is a vertical sectional view showing another embodiment of the present invention.
Unlike the case of the above-described embodiment, in this embodiment, since there is a gap between the friction washer 45 and the end surface of the boss 38, there is an effect that the adjustment range of the operating load becomes wider accordingly.

(Effects of the Invention) As described above, according to the gear shift lever mounting device of the present invention, the gear shift lever is connected to the rotary shaft, and the rotary shaft is rotatably mounted to the holder that is detachable from the vehicle body frame. A boss is fitted to the rotary shaft, the boss is fixed to the holder, a collar is fitted to the boss so as to be movable in the axial direction, and a flange portion facing the holder is provided. It is provided on the collar, a spring is interposed between the flange portion of the collar and the holder, and a nut is screwed into the tip of the rotating shaft, and the friction washer is pressed against the collar by the nut. Therefore, the length of the rotating shaft can be shortened and the spring does not protrude in the axial direction. Therefore, as compared with the case where the bosses and the springs are arranged in a row along the axial direction, the size of the device can be significantly reduced.
Further, the adjustment range of the operation load of the shift lever is widened. Furthermore,
Since the holder is attachable / detachable to / from the vehicle body frame, the gear shift lever mounting device can be assembled as a single unit. Therefore, the assemblability is improved, and the operation load can be adjusted without being incorporated in the vehicle body frame.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a gear shift lever mounting device according to an embodiment of the present invention, FIG. 2 is a front view thereof, and FIG. 3 shows a relationship between a vehicle body frame and a bracket. FIG. 4 is a front view, FIG. 4B is a sectional view taken along the line AA of FIG. 4A, and FIG. 4 is a longitudinal sectional view showing a shift lever mounting device according to another embodiment of the present invention. FIG. 6 is a side view of the riding lawn mower, FIG. 6 is a side view showing a connecting structure between a shift lever and a control arm and a connecting structure between a brake pedal and a return arm, and FIG. 7 is a view for explaining the operation of the transmission operating device. FIG. 8 and FIG. 8 are schematic views showing a mounted state of the transmission operating device. 4 ... Shift lever, 30 ... Change lever arm, 35 ... Rotating shaft, 36, 45 ... Friction washer, 37 ... Holder, 38 ...
Boss, 39 ... Collar, 39a ... Collar flange, 40 ... Spring, 43 ... Nut, 44 ... Plate nut.

Claims (1)

[Scope of utility model registration request] 1. A gear shift lever is connected to a rotary shaft, the rotary shaft is rotatably attached to a holder that is attachable to and detachable from a vehicle body frame, and a boss is fitted on the rotary shaft. Is fixed to the holder, a collar is fitted to the boss so as to be movable in the axial direction, a flange portion facing the holder is provided on the collar, and the flange portion of the collar and the holder are A gear shift lever mounting device characterized in that a spring is interposed therebetween, a nut is screwed into a portion of the tip of the rotary shaft, and the friction washer is pressed against the collar by the nut.