JPH0727234Y2 - Transmission operating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a transmission operating device mounted on a work vehicle such as a riding lawn mower or a snowplow.

(Prior Art) In a conventional work vehicle (for example, a riding lawn mower), a neutral return member that interlocks with a brake pedal depression operation and a control shaft of a transmission that rotates in association with the operation of the neutral return member There is a control arm provided with a transmission operating device for returning the transmission and the speed change lever connected to the control arm to a neutral state when the brake pedal is depressed (US Pat. 4496035 specification).

(Problems to be solved by the invention) However, in the case of the work vehicle described above, since the neutral adjustment must be performed far away from the control shaft via the control arm and the change rod, an error occurs in the neutral position of the control arm. There is a problem that is likely to occur.

It is an object of the present invention to provide a transmission operating device that can perform neutral adjustment easily and with high accuracy.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention provides a neutral return member that interlocks with a depression operation of a brake pedal and a control shaft of a transmission that interlocks with the operation of the neutral return member. In a transmission operating device that includes a control arm that rotates and that returns the control shaft to a neutral position when the brake pedal is stepped on, an adjustment member that can be vertically adjustable in a direction parallel to the control shaft is provided. Attached to the control arm, the tip of the adjusting member is located near the surface of the transmission.

(Operation) As described above, the adjusting member that can be adjusted up and down in the direction parallel to the control shaft is attached to the control arm, and the tip of the adjusting member is located near the surface of the transmission. Therefore, the control member can be temporarily fixed by lowering the adjustment member so that the tip of the adjustment member is brought into contact with the upper surface of the transmission. Also, when the head of the adjusting member is tapped with a hammer or the like, a shallow punch hole is formed on the upper surface of the transmission.

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

FIG. 4 is a side view showing a riding lawn mower equipped with a transmission operating device according to an embodiment of the present invention, and FIG. 3 is a plan view.
Reference numeral 1 is a vehicle body of a riding lawn mower, 2 is an engine arranged below a seat 3, and 4 is a speed change lever for traveling provided on a side portion of the seat 3. 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.
The mounting device 5 is connected to a hydraulic continuously variable transmission 7 via a link mechanism 6 (see FIG. 6). By operating the transmission lever 4 before and after the neutral position (neutral position), the swash plate of the swash plate type variable displacement pump in the hydraulic continuously variable transmission 7 is operated.
The inclination of 36 is controlled to control the traveling speed and direction of the vehicle body 1. 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 an input shaft of the hydraulic continuously variable transmission 7 is rotatably attached to the inside of the cutter deck 8. Deck rollers 46, which maintain the minimum height, are pivotally attached to the front and rear and right and left of the cutter deck 8 so that the lawn can be cut into a belt-like shape while traveling at a low speed. A guide panel 45 for guiding the shift lever 4 is provided diagonally above the shift lever mounting device 5 (Fig. 3). Guide panel 45
An operation guide groove 61 extending in the front-rear direction with respect to the vehicle body 1 is formed in the. At the top of the body frame 47 is the engine 2
The battery 48 is fixed, and the cover 49 covers them. 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. 7 and 8, the hydraulic continuously variable transmission 7 includes a swash plate type variable displacement pump 30, a single motor 31 driven by the pump 30, and a differential gear 32.
And an axle 33, an input shaft 34, and the like. The swash plate type variable displacement pump 30 includes a drive shaft 35 that is rotated by engine power via an input shaft 34, a swash plate 36 that is attached so as to be inclined with respect to the axis of the drive shaft 35, and the like. Gear shifting is performed by changing the inclination angle of the swash plate 36. A control shaft 7a is connected to the swash plate 36, and a tip portion of the control shaft 7a projects from the outer case 37 to the outside (FIG. 8).
The brake mechanism is the brake housing 39 provided on the board.
And a brake shoe 40 supported by the brake housing 39 and a cam 41 for expanding the brake shoe 40. The cam 41 includes a brake arm 42 and a brake connecting rod.
It is connected to the brake pedal 12 via 43.

As shown in FIGS. 1, 5, and 6, the transmission operating device includes a control arm 11 fixed to the control shaft 7a protruding above the hydraulic continuously variable transmission 7 by welding or the like. A bracket 20 bolted to a base plate 19 of the hydraulic continuously variable transmission 7, a collar 60 welded to the bracket 20, and a pivot 21 rotatably supported by the collar 60 via a bush 53. , The neutral return member 18 to which the pivot 21 is welded, and the pin welded to the neutral return member 18.
24, 25 and slit pin 54 penetrating the free end of the pivot 21
It has and. A pin 10 is provided at the free end of the control arm 11, and the pin 10 is connected to the gear shift lever mounting device 5 via a change rod 9. A collar 29 is welded to the outer peripheral edge of the control arm 11, and a female screw 38 corresponding to the screw thread provided on the outer periphery of the adjusting member 27 is provided on the inner periphery of the collar 29. The female screw 38 is the substrate
Opposite the top of 20. The tip of the adjusting member 27 is sharply pointed, a driver groove 27a is provided at the rear end of the adjusting member 27, and a nut is screwed into the adjusting member 27 from the rear end side. The control arm 11 rotates together with the control shaft 7a. Therefore, a gear shift operation for moving the gear shift lever 4 back and forth from the neutral position (neutral position) is transmitted to the control shaft 7a via the gear shift lever mounting device 5 and the link mechanism 6, and the control shaft 7a is rotated to cause an oblique movement. Board
The inclination of 36 changes to control the traveling speed and direction of the vehicle body 1.

On the other hand, as shown in FIGS. 1, 5, and 6, the brake pedal 12 is moved to the OFF position (release position of stepping operation) in FIG. 5 together with the rotating member 13 (arrow A in FIG. 5). (In the direction indicated by the arrow), the rotating member 13 moves the return rod 14,
It is connected to a neutral return member 18 via a rotating member 15, a return rod 16 and a pin 17, and is also connected to a brake device via a brake connecting rod 13a. The neutral return member 18 is bent at a bent portion 18a to avoid interference with the change rod 9 (see FIG. 1), 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 supported by the collar 29 welded to the bracket 20 fixed to the upper portion of the base plate 19 of the hydraulic continuously variable transmission 7 by the bolt 26, and the pivot 21 welded to the neutral return member 18 is bushed. It is rotatably supported by the collar 29 via 53. Therefore, the brake pedal 12
When you step from the OFF position to the ON position (stepping operation position),
The neutral return member 18 rotates from the original position shown by the chain line in FIG. 5 to the neutral return position (brake braking position) shown by the solid line, and at this time, the brake device is operated via the brake connecting rod 13a. . 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
Is provided with three long holes 20a. The bolt 26 inserted into the long hole 20a is screwed into a female screw (not shown) of the board 19,
The bracket 20 is fixed to the upper part of the base plate 19 of the continuously variable transmission 7.

As shown in FIG. 5, 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.

Next, the procedure for setting the neutral position will be described.

First, the control arm 11 is rotated about the control shaft 7a in the forward and backward directions, the starting points of the respective movements are found, and the intermediate point between the two points is set to the neutral position.

Next, the adjusting member 27 is screwed in and temporarily tightened, the tip end thereof is brought into contact with the top surface of the substrate 19, and the rear end of the adjusting member 27 is lightly hit to form a recess (bunch hole) 19a in the substrate 19. And adjusting member 2
Screw in 7 further and tighten the lock nut 28. As a result, the neutral position is stored and held.

After that, the control arm 11 and the change rod 9 are connected to each other via the pin 10, and the length of the change rod 9 is adjusted so that the operation lever 4 comes to the neutral position.

Finally, the change rod 9 is fastened, and then the adjusting member 27
Loosen and fix with the lock nut 28. Since the tip of the adjusting member 27 is separated upward from the recess 19a, there is no problem in operation.

As described above, in the transmission operating device of this embodiment, the collar 29 is welded to the outer peripheral edge of the control arm 11, and the collar 29 is provided with the female screw 38 corresponding to the thread of the adjusting member 27. The female screw 38 faces the top surface of the substrate 19, and the tip of the adjusting member 27 is sharply pointed.
A driver groove 39 is provided at the rear end of the 27
28 is screwed. Therefore, when the control shaft 7a is set to the neutral position, the adjusting member 27 can be screwed by a driver (not shown) to press the tip of the adjusting member 27 against the top surface of the substrate 19 to temporarily fix the control arm 11. . As a result, the length of the change rod 9 connected to the control arm 11 can be accurately and quickly obtained.

If the head of the adjusting member 27 is lightly hit with a hammer or the like,
Since the shallow recess 19a is formed on the top surface of the substrate 19, the neutral position can be easily found when the transmission operating device is disassembled and reassembled.

(Effects of the Invention) As described above, according to the transmission operating device of the present invention, the neutral return member that interlocks with the depression operation of the brake pedal, and the control shaft of the transmission that rotates in conjunction with the operation of the neutral return member. In a transmission operating device including a control arm for moving the brake pedal and returning the control shaft to a neutral position when the brake pedal is stepped on, an adjusting member that can be vertically moved in a direction parallel to the control shaft is provided. Since the tip of the adjusting member is attached to the control arm and the tip of the adjusting member is located in the vicinity of the surface of the transmission, the adjusting member is lowered to bring the tip into contact with the upper surface of the transmission to temporarily move the control arm. Can be fixed to. Therefore, the length of the change rod connected to the control arm can be accurately and quickly obtained.

Further, when the head of the adjusting member is lightly hit with a hammer or the like, a shallow concave portion is formed on the upper surface of the transmission, so that the neutral position adjustment can be easily performed when the transmission operating device is disassembled and reassembled.

[Brief description of drawings]

1 is a longitudinal sectional view showing a transmission operating device according to an embodiment of the present invention, FIG. 2 is a rear view showing a riding lawn mower equipped with the transmission operating device, and FIG. 3 is a plan view thereof. FIG. 4 is a side view showing the entire riding lawn mower, FIG. 5 is a view for explaining the operation of the transmission operating device, and FIG. 6 is a connecting structure of a shift lever and a control arm, a brake pedal and a return. FIG. 7 is a side view showing a connecting structure with an arm, FIG. 7 is a longitudinal sectional view of a hydraulic continuously variable transmission, and FIG. 8 is VIII-VI of FIG.
It is a II line arrow line view. 4 ... shift lever, 7 ... hydraulic continuously variable transmission (transmission),
7a …… Control axis, 11 …… Control arm, 12
…… Brake pedal, 18 …… Neutral return member, 27 …… Adjustment member, 28 …… Lock nut, 29 …… Collar, 38 …… Female thread, 53 …… Bush, 54 …… Slit pin.

Claims (1)

[Scope of utility model registration request] 1. A neutral return member that interlocks with a depression operation of a brake pedal, and a control arm that rotates a control shaft of a transmission in conjunction with the operation of the neutral return member. When the brake pedal is depressed. In the transmission operating device for returning the control shaft to the neutral position, an adjusting member which can be adjusted up and down in a direction parallel to the control shaft is attached to the control arm, and a tip of the adjusting member is attached to the transmission. A transmission operating device characterized in that it is located near the surface of the machine.