JPH07343Y2 - Vehicle transmission operating device - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a transmission control shaft and a gear shift lever,
The present invention relates to an operating device for a vehicle transmission used for a working vehicle such as a riding lawn mower configured to return to a neutral position when a brake pedal is depressed.

(Prior Art) As such a conventional work vehicle for a riding lawn mower, for example, there is one disclosed in US Pat. No. 3,511,105. In this conventional technique, a roller is supported on a crank arm (control arm) that transmits a forward / backward movement centered on a neutral position of an operation lever (shift lever) to a swash plate side of a hydraulic transmission through a control rod. In addition, a substantially triangular opening with which the roller engages is formed in the cam link that is displaced downward in conjunction with the brake pedal, and when the cam link is displaced downward in conjunction with the depression operation of the brake pedal, The roller enters the longitudinally extending slot of the opening while contacting the cam surface of the opening, whereby the control shaft and the operating lever of the hydraulic transmission are returned to the neutral position.

(Problems to be Solved by the Invention) However, in the above-mentioned conventional technology, when the cam link is displaced downward in conjunction with the operation of depressing the brake pedal, the roller rolls on the cam surface with the inclined opening. Since the roller and the inclined cam surface of the opening come into contact with each other with a strong force because of the configuration to enter the slot, the cam surface and the roller are easily worn, and the operation force of the brake pedal is
Since the control arm directly acts as a twisting force or a bending force other than the rotational force through the contact between the inclined cam surface and the roller, there is a problem that the control arm has poor durability.

The present invention has been made in view of such a conventional problem, and reduces wear of the contact portion between the control arm and the neutral return member, and further reduces the wear of the control arm and the control shaft of the transmission which is interlocked with the control arm. An object of the present invention is to provide an operating device for a transmission for a vehicle, which has improved durability.

(Means for Solving the Problem) In order to achieve such an object, in a vehicle transmission operating device according to the present invention, a transmission control shaft and a gear shift lever return to a neutral position when a brake pedal is depressed. In a vehicle transmission operating device configured as described above, a control arm that rotates the control shaft in conjunction with operation of the transmission lever, and a rotation from an original position to a neutral return position in conjunction with the stepping operation. And a neutral return member that returns to its original position by releasing the stepping operation, the control arm is provided with a plurality of long grooves substantially concentrically with respect to the center of rotation of the arm, and the neutral return member is provided. A plurality of pins corresponding to the plurality of long grooves are provided, and at least one of the plurality of pins corresponds to the neutral return member when pivoting to the neutral return position. The plurality of long grooves and the pins are arranged so as to engage the ends of the long grooves and return the control arm to the neutral position.

(Operation) In the above-described vehicle transmission operating device, at the time of turning the neutral return member to the neutral return position, at least one of the plurality of pins corresponds to one of the plurality of long grooves provided substantially concentrically. The control arm is returned to the neutral position by engaging the end of the long groove. Therefore, the stepping operation force of the brake pedal does not act on the control arm as a twisting force or a bending force other than the rotating force.

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

FIG. 2 is a side view showing a riding lawn mower equipped with a vehicle transmission operating device according to an embodiment of the present invention, in which 1 is a riding lawn mower and 2 is an engine arranged under a seat 3. Denoted at 4 are traveling speed change levers provided on the sides 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, and the mounting device 5 is connected to a hydraulic continuously variable transmission 7 via a link mechanism 6 (see FIG. 3). ing. By operating the speed change lever 4 before and after the neutral position, the inclination of the swash plate (not shown) of the drive pump in the hydraulic continuously variable transmission 7 is controlled to control the traveling speed and direction of the riding lawn mower 1. It has become so. Further, a cutter deck 8 is provided in the lower part of the riding lawn mower 1, and a cutter blade (not shown) that is rotated by an input shaft to the hydraulic continuously variable transmission 7 is rotatably mounted in the cutter deck 8. The lawn can be trimmed into strips while traveling at low speed.

As shown in FIGS. 1, 3, and 4, 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 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 around the neutral position is transmitted to the control shaft 7a via the shift lever mounting device 5 and the link mechanism 6, and the rotation of the control shaft 7a causes an unillustrated oblique movement. The inclination of the board changes to control the traveling speed and direction of the riding lawn mower 1.

On the other hand, as shown in FIGS. 1, 3, and 4, 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. 1). It is urged to rotate in the direction indicated by. The rotating member 13 is connected to a neutral return member 18 via a return rod 14, a rotating member 15, a return rod 16, and a pin 17, and
It is connected to a brake device (not shown) via 13a. The neutral return member 18 is bent up and down at a bent portion 18a in order to avoid interference with the change rod 9 (see FIG. 4), and its lower portion 18b is attached to the return rod 16 by a pin 17. It is connected. An upper side portion 18c of the neutral return member 18 is rotatably supported by a pivot shaft 21 provided on a bracket 20 fixed to a side surface of the hydraulic continuously variable transmission 7 with a bolt via a base plate 19. Therefore, when the brake pedal 12 is depressed 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. 1 to the neutral return position (brake braking position) shown by the solid line. Then
At this time, the brake device is operated via the rod 13a. When the depression operation of the brake pedal 12 is released, the pedal 12 returns to the OFF position by the urging force, so that the neutral return member 18 also returns to the original position.

As shown in FIG. 1, the control arm 11 includes
Two long grooves 22 and 23 are provided substantially concentrically with respect to the rotation center of the arm 11. On the other hand, the neutral return member 18,
Two pins 24, 25 corresponding to the long grooves 22, 23 are provided, and when the neutral return member 18 is rotated to the neutral return position,
Long groove 22,23 corresponding to at least one of the two pins 24,25
The two long grooves 22 and 23 and the two pins 24 and 25 are arranged so as to engage with the ends of the control arm 11 to return the control arm 11 to the neutral position. Further, in this embodiment, the two pins 24 and 25 are set to 2 in a state where the control arm 11 is returned to the neutral position.
The two long grooves 22 and 23 are configured to abut simultaneously on opposite ends. It should be noted that one of the two pins 24, 25 may abut one end of the corresponding long groove 22, 23 in a state where the control arm 11 returns to the neutral position.

The operation of the above embodiment will be described below.

Now, the speed change lever 12 is in the forward high speed position (FWD high speed position), the control arm 11 is in the forward high speed position shown by the solid line in FIG. 5, and the riding lawnmower 1 travels forward at high speed. ing. At this time, pin 2 on the neutral return member 18
Both 4,25 are in contact with the left ends of the long grooves 22,23 as shown by the solid line in FIG. When the brake pedal 12 is depressed during this forward traveling, the brake pedal 12 is shown in FIG.
It rotates together with the rotating member 13 from the OFF position to the ON position, and this rotation causes the return rod 14, the rotating member 15, and the return rod.
16 and the pin 17 are transmitted to the neutral return member 18, and the neutral return member 18 in the original position shown by the solid line in FIG. 5 moves counterclockwise around the pivot shaft 21 to the neutral return position shown by the chain line in FIG. Turn to. By this rotation, the pin 24 pushes the left end of the long groove 22, so that the control arm 11 moves from the forward high speed position to the neutral position (N position) shown by the chain line in FIG. 5 for the control shaft of the hydraulic continuously variable transmission. Rotate clockwise with 7a. When the control arm 11 rotates to the neutral position, the control shaft 7a and the speed change lever 4 return to the neutral position.

As described above, when the neutral return member 18 is rotated to the neutral return position, the pin 24 pushes the left end portion of the long groove 22 and the control arm 11 is rotated to the neutral position side.
The stepping operation force of does not act on the control arm 11 as a twisting force or a bending force other than the rotating force. Therefore, wear of the contact portion between the pin 24 and the long groove 22 is small.

Further, in this embodiment, when the control arm 11 is rotated to the neutral position, the two pins 24 and 25 are attached to the two long grooves 2.
It is in contact with the opposite ends of 2, 23 at the same time. That is, since the pin 24 is in contact with the left end of the long groove 22 and the pin 25 is in contact with the right end of the long groove 23 (state of the solid line in FIG. 1 and the chain line in FIG. 5), the left end of the long groove 22 and the long groove 23 are in contact. The depressing operation force of the brake pedal 12 that acts on the right end of each of them is offset, and the operation force does not act on the control arm 11. Therefore, the impact force does not act on the control arm 11 and the control shaft 7a that rotates with the arm 11, and the durability of both members is improved.

Now, when the shift lever 12 is in the forward low speed position, the control arm 11 is in a position rotated clockwise from the forward high speed position shown by the solid line in FIG.
Both 4 and 25 are separated from the left ends of the long grooves 22 and 23, and the riding lawnmower 1 is traveling forward at a low speed. Even when the brake pedal 12 is depressed during such low speed traveling, the neutral return member 18 is rotated to the neutral return position shown by the chain line in the same figure as described above, and by this rotation, the control shaft 7a and the gear shift lever are rotated. 4 returns to the neutral position.

Now, the gearshift lever 12 is in the backward high speed position (RVS maximum speed position), the control arm 11 is in the backward high speed position shown by the solid line in FIG. 6, and the riding lawn mower 1 travels backward at high speed. ing. At this time, the pin 24 is in contact with the right end of the long groove 22 and the pin 25 is separated from the right end of the long groove 23 (state shown by the solid line in FIG. 6). When the brake pedal 12 is depressed during this backward traveling, the neutral return member 18 in the original position shown by the solid line in FIG. 6 rotates to the neutral return position shown by the chain line in the same figure as above. By this rotation, the pin 25 becomes the long groove 23.
Since the right end of the control arm 11 is pushed, the control arm 11 rotates counterclockwise together with the control shaft 7a from the retracted high speed position to the neutral position (N position) shown by the chain line in FIG.
When the control arm 11 rotates to the neutral position,
The control shaft 7a and the speed change lever 4 return to the neutral position.

Even in this case, the rotation of the neutral return member 18 to the neutral return position causes the pin 25 to push the right end portion of the long groove 23 and rotate the control arm 11 to the neutral position side. It does not act on the control arm 11 as a twisting force or a bending force other than the rotational force. Therefore,
Little wear on the contact portion between the pin 25 and the long groove 23.

Also in this case, when the control arm 11 is rotated to the neutral position, the two pins 24 and 25 are engaged with the long groove 22,
Since they are in contact with the opposite end portions of 23 at the same time, the operation force of the brake pedal 12 does not act on the control arm 11.

Now, when the shift lever 12 is in the backward low speed position, the control arm 11 is in a position rotated counterclockwise from the backward high speed position shown by the solid line in FIG.
Both 24 and 25 are separated from the right ends of the long grooves 22 and 23, and the riding lawn mower 1 travels backward at a low speed. Even when the brake pedal 12 is depressed during such low speed traveling, the neutral return member 18 is rotated to the neutral return position shown by the chain line in the same figure as described above, and by this rotation, the control shaft 7a and the gear shift lever are rotated. 4 returns to the neutral position.

In addition, in the said Example, although the said long groove and the pin were made into two, the number of this long groove and a pin is not limited to two.

(Effects of the Invention) As described in detail above, according to the operating device for a vehicle transmission of the present invention, the control shaft and the transmission lever of the transmission are configured to return to the neutral position when the brake pedal is depressed. And a control arm for rotating the control shaft in conjunction with the operation of the shift lever, and a control arm for rotating from the original position to the neutral return position in conjunction with the stepping operation. A neutral return member that returns to its original position when the stepping operation is released, the control arm is provided with a plurality of long grooves substantially concentrically with respect to the rotation center of the arm, and the neutral return member is provided with the plurality of long grooves. A plurality of pins corresponding to the long grooves are provided, and when the neutral return member is rotated to the neutral return position,
The neutral position of the neutral return member is neutralized by the configuration in which the long grooves and the pins are arranged so that at least one of the plurality of pins engages with the end of the corresponding long groove to return the control arm to the neutral position. When turning to the return position,
Since at least one of the plurality of pins is engaged with the end of the corresponding long groove of the plurality of long grooves provided substantially concentrically, the control arm is returned to the neutral position. However, it does not act on the control arm as a twisting force or bending force other than rotational force. Therefore, the wear of the contact portion between the control arm and the neutral return member is reduced, and the durability of the control arm and the control shaft of the transmission linked thereto can be improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an operating device for a vehicle transmission according to an embodiment of the present invention, and FIG. 2 is a side view showing a riding lawn mower having an operating device for a vehicle transmission according to an embodiment. Figure, third
FIG. 4 is a side view showing a connecting structure between a speed change lever and a control arm and a connecting structure between a brake pedal and a neutral return member, FIG. 4 is a view taken along the arrow IV in FIG. 3, and FIGS. 5 and 6 are control arms. FIG. 6 is a plan view for explaining the operation of the neutral return member. 4 ... shift lever, 7 ... hydraulic continuously variable transmission (transmission),
7a …… Control axis, 11 …… Control arm, 12
…… Brake pedal, 18 …… Neutral return member, 22,23 ……
Long groove, 24,25 ... pin.

Claims (1)

[Scope of utility model registration request] 1. A control device for a vehicular transmission, wherein a control shaft and a shift lever of the transmission are configured to return to a neutral position when a brake pedal is depressed, and the control is performed in conjunction with the operation of the shift lever. The control arm includes a control arm that rotates the shaft and a neutral return member that rotates from an original position to a neutral return position in conjunction with the stepping operation and returns to the original position by releasing the stepping operation. The long groove is provided substantially concentrically with respect to the rotation center of the arm, and the neutral return member is provided with a plurality of pins corresponding to the plurality of long grooves, so that the neutral return member is returned to the neutral return position. When turning
A plurality of long grooves and pins are arranged so that at least one of the plurality of pins is engaged with an end portion of the corresponding long groove to return the control arm to a neutral position. Machine operation device.