JPH02306830A - work vehicle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a work vehicle such as a riding lawnmower or snow blower on which a worker rides and works.

(Prior Art) Conventional work vehicles (for example, riding lawnmowers) have a neutral return member that is linked to the depression of a brake pedal, and a control shaft of a transmission that is rotated in conjunction with the action of the neutral return member. There is a control arm equipped with a shift fil operation device that returns the transmission and a shift lever connected to the control arm to a neutral state when the brake pedal is depressed (U.S. Patent No. 4496035 specification).

(Problem to be Solved by the Invention) However, in the case of a conventional work vehicle, the neutral return member is fixed to the vehicle body frame, the control shaft of the transmission includes the neutral return member, and the transmission operating device and Because the device and the brake connecting rod that connects the brake pedal are located far inside the vehicle body frame, there is a large dead space between the first gear and the wheel, and the brake connecting rod is located toward the center of the vehicle. Therefore, there was a risk that the rod and the pond members would come into contact with each other.

SUMMARY OF THE INVENTION An object of the present invention is to provide a work vehicle that can effectively utilize the space between the transmission and the wheels, as well as facilitate mounting of the transmission and ease of shifting to neutral 311 m.

(Means for Solving the Problem) In order to achieve the above-mentioned object, the present invention includes a neutral return member that is linked to the depression operation of the brake pedal, and a control shaft of the transmission that is linked to the operation of the neutral return member. In the work vehicle, the transmission operating device is equipped with a control arm that rotates the control arm, and that returns the control shaft to the neutral position when the brake pedal is depressed. The transmission operating device is disposed between the gearbox and the wheel, and the transmission operating device is detachably attached to the 01j transmission.

(Function) Since the transmission operating device is arranged between the transmission and the wheels as described above, the return rod that connects the brake pedal and the neutral return member and the change rod that connects the speed change lever and the control arm are , each approximately 11r, can be centrally arranged along the body frame.

Furthermore, since a structure is adopted in which the transmission operating device is detachably attached to the transmission, the transmission operating device can be incorporated in a 0:1 system in which the transmission is mounted on the vehicle body. Therefore, neutral adjustment can be performed when motoring the transmission alone, and the troublesome two-knee adjustment after mounting the transmission on the vehicle body can be done.
At the same time, the fF and turning characteristics of the vehicle body are improved.

(Example) Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 4 is a side view showing the configuration of a riding lawn mower according to an embodiment of the Kippatsu 11, and FIG. 3 is a top view. engine, 4 is seat 3
The gear shift levers for driving installed on the sides of the vehicle are shown.

The speed change lever 4 is attached to a speed change lever mounting device 5 that rotates when the lever 4 is operated. is connected to. By operating the gear shift lever 4 back and forth from the neutral position to the neutral position, the inclination of the swash plate 36 of the swash plate type variable displacement pump in the hydraulic continuously variable transmission 7 is controlled, and the traveling speed and direction of the vehicle body l are controlled. It is now possible to do so. In addition, there is a cutter deck 8 at the bottom of the car body.
A hydraulic continuously variable transmission 7 is installed inside the cutter deck 8.
A cutter blade 44 rotated by an input shaft is rotatably mounted, and four deck rollers 46 for maintaining the minimum height of the cutter deck 8 are rotatably mounted on the front, rear, left and right sides of the cutter deck 8. The lawn can be cut into strips while traveling at low speed.A guide panel 45 is provided diagonally above the shift lever mounting device 5 to guide the shift lever 4 (Fig. 3).Guide panel 45 is formed with an operating guide groove 61 that extends in the rearward direction with respect to the vehicle body l.

The engine 2 and battery 4 are mounted on the upper part of the vehicle body frame 47.
8 are fixed and covered with a cover 49. The handle 50 is used to steer the front wheels 51. Wheels 52 are fixed to both ends of the axle 33. Further, 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, one motor 31 driven by the pump 30, a differential gear 32, and an axle 33. , human power 111134, an outer case 37, an inner case 54, etc. The Jl plate type variable displacement pump 30 is tilted with respect to the drive shaft 35, which is rotated by engine power via the human power shaft 34, and the center of the drive shaft 35! It is equipped with a swash plate 36, etc., which is angled as shown in FIG. The tip of the control shaft 7a is connected to the outer case 37.
It protrudes from the outside (Fig. 8). The brake mechanism includes a brake housing 39 provided on a substrate, a brake shoe 40 supported by this brake housing 39,
A cam 41 that spreads the brake shoe 40 is provided.
1 is connected to the brake pedal 12 via a brake arm 42 and a brake connecting rod 43.

As shown in FIGS. 1, 5121, and 6, the transmission operating device includes a control arm It fixed by welding or the like to the control 1III17a protruding from the top of the hydraulic continuously variable transmission 7, and a hydraulic control arm It. Board 1 of step transmission 7
A bracket 20 bolted to 9, a collar 60 welded to this bracket 20, and this collar 60
The pivot shaft 21 is rotatably supported via a bushing 53.
, the neutral return member 18 to which this pivot 11111121 is welded, and the bottle 2 to which this neutral return member I8 is welded.
4.25 and a slit bin 54 passing through the free end of the pivot 21. A pin 10 is provided at the free end of the control arm II, which pin 10 is connected to the gearshift lever mounting device 5 via a change rod 9. A collar 29 is welded to the outer periphery H of the control arm 11, and the collar 29 is provided with a female thread 38 that corresponds to a thread provided on the outer periphery of the AI joint member 27. The female thread 38 faces the top surface of the substrate 19. The tip of the adjustment member 27 is sharp, and a driver groove 27a is provided at the rear end of the adjustment member 27, and a lock nut 28 is screwed into the adjustment member 27 from the rear end side. The control arm 11 rotates together with the control shaft 7a. Therefore, the shift operation can be performed without moving the shift lever 4 forward or backward from the neutral position (neutral position).
= 1 is transmitted to the control shaft 7a via the 1 device 5 and the link machines 11-16, and the rotation of the roll shaft 7a changes the 1 (axis) of the swash plate 36 to change the traveling speed and direction of the vehicle body l. is controlled.

On the other hand, the brake pedal 12 is
As shown in the figure, together with the rotating member l:3, the OFF position in FIG.
The rotating member 13 is urged to rotate toward the position (the release position of the depressing operation) (in the direction indicated by the arrow in FIG. It is connected to the neutral return +i1 member 18 through the brake lever, and to a brake device through the brake connecting rod 13a. The neutral restoring member 18 has a bent portion 18a to avoid interference with the change rod 9 described in 01j.
(see Figure 1), and its lower side +8b
is connected to the return rod 16 by a pin 17. The upper part 18c of the neutral return member 18 is supported by a collar 29 welded to a bracket 20 fixed to the upper part of the base plate 19 of the hydraulic continuously variable transmission 7 with bolts 26, and a pivot 21 welded to the neutral return member 18 is supported by a bushing. It is rotatably supported by the collar 29 via 53. Therefore, when the brake pedal 12 is depressed from the 017F position to the ON position (depression operation position), the neutral return member 18 moves from the original position shown by the chain line in FIG. 5 to the neutral return position (brake left position movement position) shown by the solid line. At this time, the brake connecting rod 13
The brake device is operated via the a.

Moreover, when the depression operation of the brake pedal 12 is released,
Since the pedal 12 returns to the OFF position due to the biasing force of a return spring (not shown), the neutral return member 18 also
Return to original position. Furthermore, 0? J bracket 20 is 3
Two elongated holes 20a are provided, and the bolts 26 pushed into the elongated holes 20a are screwed into female threads (not shown) of the board I9 to fix the bolts 20 to a part of the board 19 of the continuously variable transmission 7. It has been done.

As shown in FIG. 5, the control arm 11 is provided with two long grooves 22 and 23.

On the other hand, the neutral return member 18 marked 0;j is provided with two bins 24 and 25 corresponding to the length t^\22゜23, and the turn position marked 1);j of the neutral return 1 leg member 18 is provided. When pivoting to t7., at least one of the two pins 24.25 engages the end of the corresponding long groove 22, 2:3, returning the control arm 11 to the neutral (q position).
? 22.23 and two bins 24.25 are arranged. In addition, when the control arm 11 returns to the neutral position rg, the two bins 24 and 25 are connected to the two long grooves 22 and 2.
3 at the same time.

Next, the neutral position setting procedure will be described. First, the control arm 11 is rotated forward and backward around the control shaft 7a, the points at which each movement starts are found, and the midpoint between the two points is set as the neutral position. Next, the adjustment member 27 is screwed in and temporarily tightened, the tip of the adjustment member 27 is brought into contact with the top surface of the base plate 19, and the control arm 11 is temporarily fixed. Thereby, the length of the control rod 9 connected to the control arm It can be increased to a good degree and quickly. In addition, when the temporarily tightened adjustment member 27 is lightly punched, a recess (
Since the punch hole 19a is formed, the neutral position is memorized and retained, and the neutral position can be easily found when the transmission operating device is disassembled and reassembled.

After that, the control arm 11 and the change rod 9 are connected via the pin 10, and the length of the change rod 9 is
Adjust so that the operating lever 4 is in the neutral position. Finally, the change rod 9 is fastened, and then the adjustment member 27 is loosened and fixed with the lock nut 28. Since the tip of the adjusting member 27 is separated upward from the punch hole 19a, there is no problem in operation.

In the riding lawnmower of this embodiment, the transmission operating device is disposed between the hydraulic continuously variable transmission 7 and the wheels as described above, so the return rods 14 and 16 connect the brake pedal and the neutral return member. , and the change rod 9 that connects the speed change lever and the control arm can be centrally arranged substantially along the vehicle body frame 47, respectively.

Therefore, the space between the hydraulic continuously variable transmission 7 and the wheel 52, which was a dead space in the past, can be effectively utilized.

In addition, since we have adopted a structure in which the transmission operating device can be detachably attached to the hydraulic continuously variable transmission 7, the transmission operating device can be installed before mounting the hydraulic continuously variable transmission 7 on the vehicle body. . Therefore, neutral adjustment can be performed when motoring the hydraulic continuously variable transmission alone. That is, first, the control arm 11 is rotated in both forward and backward directions to set the neutral position (neutral position), and then, as shown in FIG. so that it hits the opposite end of
Neutral adjustment is performed by rotating the neutral return member 18. After that, a hydraulic gear transmission 7 was installed on the car body,
Assemble the link mechanism 6, adjust the length of the change rod 9 to match the neutral position of the control arm 11, which was adjusted in advance when assembling the hydraulic continuously variable transmission 7, and step the brake pedal 12 to the ON position. The length of the return rod 16 may be inllm so that at least one of the pins 22, 23 of the neutral return member 18 hits the lengths 22, 23 of the control arm 11 in this state. Therefore, the troublesome neutral adjustment after mounting the hydraulic continuously variable transmission 7 on the vehicle body becomes unnecessary, and at the same time, the ease of mounting on the vehicle body is improved.

(Effects of the Invention) As explained above, according to work 1 of the present invention, there is a neutral return member that is linked to the depression operation of the brake pedal, and a control shaft of the transmission is rotated in conjunction with the operation of the neutral return member. In the working vehicle, the transmission operating device is equipped with a transmission operating device that returns the control shaft to a neutral position when the brake pedal is depressed, and the transmission operating device is equipped with a control arm that moves the control shaft to the neutral position when the brake pedal is depressed. and the wheel, and the transmission operating device is removably attached to the transmission, so there is a return rod connecting the brake pedal and the neutral return member, as well as the gear shift lever and the control. The change rods connecting the arms can be centrally arranged substantially along the vehicle body frame. Therefore, the space between the transmission and the wheels, which was conventionally a dead space, can be effectively utilized.

In addition, since we have adopted a 41 structure that attaches the transmission operating device to the transmission in a detachable manner, it is possible to incorporate the gear shifting!j! operating device before mounting the transmission on the body. This eliminates the need for troublesome neutral adjustment after mounting on the vehicle body, and at the same time improves the ease of mounting on the vehicle body.

[Brief explanation of drawings]

FIG. 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 with the transmission operating device 15@, and FIG. 3 is a plan view thereof. 4 is a side view showing the entire riding lawn mower, and FIG. 5 is a side view showing the entire riding lawn mower.
Figure 6 is a side view showing the connection structure between the gear shift lever and the control arm as well as the connection structure between the brake pedal and the return arm.
The figure is a vertical cross-sectional view of the hydraulic continuously variable transmission, and Figure 8 is the Vl of Figure 7.
-■ Arrow view 4...Shift lever, 7...Hydraulic continuously variable transmission (shift 1
7a... Control shaft, II... Control arm, 12... Brake pedal, 18... Neutral return member, 27... Adjustment member, 28... Lock nut, 29... Collar, 38...female thread, 52...
wheel.

Claims (1)

[Claims] 1. A neutral return member that is linked to the depression operation of the brake pedal, and a control arm that rotates the control shaft of the transmission in conjunction with the action of the neutral return member, and the control arm is provided to rotate the control shaft of the transmission in conjunction with the operation of the neutral return member, and when the brake pedal is depressed, the control arm In a work vehicle equipped with a transmission operating device for returning a shaft to a neutral position, the transmission operating device is disposed between the transmission and a wheel, and the transmission operating device is connected to the transmission. A work vehicle characterized by being removably attached.