JPH074519A - Speed change operating structure for working vehicle - Google Patents

Abstract

PURPOSE:To provide the speed change operating structure capable of finely adjusting a traveling speed with such an advantage as to easily change a speed by means of an actuator. CONSTITUTION:In the speed change operating structure for a working vehicle where a speed change operating lever 5 is connected to a continuously variable transmission 3 for traveling and an electric motor M capable of freely changing a speed of the continuously variable transmission 3 is disposed in such a state as to allow speed change operation by means of the speed change operating lever 5, finger-operated operating switches 24, 25 for instructing to drive the electric motor M in the forward and reverse operating directions, respectively, are provided in a grip portion 5a of the speed change operating lever 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a state in which a speed change operation tool is linked to a continuously variable transmission for traveling, and an actuator capable of performing a speed change operation on the continuously variable transmission allows a speed change operation by the speed change operation tool. The invention relates to a gear shift operation structure for a work vehicle, which is provided with a gear shift holding mechanism for continuously holding the gear shift state in a state where the gear shift operation by the gear shift operation tool and the actuator is allowed.

[0002]

2. Description of the Related Art Conventionally, in the above-described gear shift operation structure for a work vehicle, a detection switch is provided at a rotation fulcrum portion of a gear shift operation tool for detecting that an operation force is applied in either an acceleration or deceleration operation direction. Based on the detection result of the detection switch, the actuator is driven in one of acceleration and deceleration operation directions, and the shift holding is provided to hold the neutral return force of the continuously variable transmission at an arbitrary shift position. There has been a structure in which the actuator can be lightly operated by using the actuator as compared with the case of manually operating the shift operation tool against the holding force of the mechanism.

[0003]

However, in the above-mentioned conventional structure, since the detection switch for detecting the operating state of the gear shift operating device is provided at the rotation fulcrum, it is difficult to finely adjust the traveling speed. There were some drawbacks and there was still room for improvement. It is an object of the present invention to provide a work vehicle gear shift operation structure that enables fine adjustment of the traveling speed while allowing the gear shift operation to be performed lightly using an actuator.

[0004]

The features of the first invention are as follows:
In the work vehicle gear shift operation structure described at the beginning, there is a point that the grip portion of the gear shift operation tool is provided with finger-operable drive command means for instructing the actuator to drive in either forward or reverse operation directions. According to a second aspect of the present invention, the continuously variable transmission is configured to be operable forward and backward, and the restraint means prevents the shift operation tool from shifting from the forward shift range to the reverse shift range. The release operation member is provided on the grip portion in a state where it can be lifted to an upper release operation position by a finger with a palm placed on the upper surface of the grip portion, and the drive instruction means is attached to the release operation member. There is a point.

[0005]

According to the characteristic construction of the first aspect of the invention, the actuator is driven in either the forward or reverse direction by operating the drive commanding means by finger operation while gripping the handgrip portion of the speed change operation tool. If the finger operation of the drive command means can be released at a desired gear shift position and it is desired to accelerate or decelerate the aircraft traveling speed by a very small range while traveling on an uneven terrain, etc., Fine adjustment of the actuator can be easily performed by operating the drive command means with a finger while operating the grip portion with a hand. According to the characteristic configuration of the second aspect of the invention, the restraint means operates in consideration of traveling safety so that the shift operation tool does not continuously switch from the forward speed shift range to the reverse speed shift range of the continuously variable transmission, but is released. By lifting the operation member to the upper release operation position with the fingers with the palm resting on the upper surface of the grip, the restraint state is released and it becomes possible to operate in the reverse shift range. At this time, for example, by operating the drive command means with a thumb,
Fine adjustment operation by the actuator can be performed without difficulty.

[0006]

Therefore, according to the characteristic configuration of the first invention,
By finely adjusting the speed change operation tool with a finger while operating it with fingers, it is possible to perform a fine adjustment speed change operation by the actuator of the aircraft traveling speed on rough terrain, etc. Moreover, it is possible to hold the position as it is at the desired gear change position by gripping operation. hand,
While it has the advantage that it can be operated lightly by the actuator, it can be operated with the same feeling as manual operation, improving maneuverability. According to the characteristic configuration of the second aspect of the invention, in addition to the effect of the first aspect of the invention, fine adjustment operation of the actuator can be performed by finger operation in a comfortable operation state even in a gear shift operation when moving the vehicle backward. , Driving safety has been improved.

[0007]

Embodiments will be described below with reference to the drawings. 1 and 2 show a transmission operation system of a combine, which is an example of a work vehicle. The power of the engine E is input to the hydrostatic continuously variable transmission 3 [hereinafter, abbreviated as continuously variable transmission] via the belt transmission mechanism 2, and the shift output by the continuously variable transmission 3 is output to the left and right crawler traveling devices 4, 4. 4, a continuously variable transmission 3 is manually operated by a gear shift operation lever 5 (an example of a gear shift operation tool) provided in the body control section to move forward and backward continuously. I am working together. Further, an electric motor M [an example of an actuator] capable of performing a gear shift operation of the continuously variable transmission 3 is provided in a state where a manual gear shift operation by the gear shift operation lever 5 is allowed. More specifically, the support shaft 7 of the gear shift operation lever 5 is inserted into the boss portion 6a formed on the machine body frame 6, and the operation plate 8 that swings integrally with the gear shift operation lever 5 is relatively rotatable on the support shaft 7. The friction plates 9 and 10 are fitted on both sides of the operation plate 8 while being fitted.
The friction type speed change holding mechanism H is configured so that the disc springs 11 urge the plate springs to squeeze them in a state where they are interposed.
The operation plate 8 is linked to the trunnion shaft 12 of the continuously variable transmission 3 through a link mechanism 13, and the gear shift operation lever 5
It is configured so that the gear shift operation can be manually performed by swinging the disk against the holding frictional force between the disc spring 11 and the friction plates 9 and 10. Further, by interlockingly connecting the support shaft 7 so as to be rotationally driven by the electric motor M and driving the electric motor M,
The operation plate 8 is rotated by the friction holding force of the friction type speed change holding mechanism H so that a speed change operation can be performed.

A control device 14 is provided for driving and controlling the electric motor M so as to decelerate the vehicle speed when the engine load becomes larger than a set value due to an increase in the threshing work load or the like during traveling of the mowing work. That is, the rotation speed detection sensor S1 that detects the output rotation speed of the engine E is provided, and this output is input to the control device 14. Then, the control device 14
When it is detected that the engine speed becomes equal to or less than the set value and the load becomes large, the electric motor M is driven and the deceleration control is automatically performed so that the engine E is not overloaded. . An automatic on / off switch 15 is provided that can be switched between a state in which the vehicle speed control operation is performed and a state in which the vehicle speed control operation is not performed.

A reverse check mechanism 16 is provided as a check mechanism for restraining the shift operation lever 5 from shifting from the forward shift range to the reverse shift range, and a release operation member 17 for releasing the reverse check state is provided. The gripping portion 5a of the speed change operation lever 5 is provided on the gripping portion 5a in a state where it can be lifted up to an upper release operation position by a finger with a palm placed on the upper surface thereof. More specifically, a rod 19 biased downward by a spring 18 is slidably mounted inside the tubular gear shift lever 5, and a lower end portion of the rod 19 is provided with a slit 20 formed in the gear shift lever 5. A guide pin 21 is formed so as to project laterally outward. Further, a regulation plate 23 fixed to the machine body frame 6 is formed with a regulation groove 23 in a two-step upper and lower stepwise engagement with the guide pin 21. This regulation groove 2
On the lower side of 3, the guide pin 21 is formed so as to be movable only in the forward shift range from the shift neutral position, and the backward check mechanism 16 is configured so as to restrain the operation toward the reverse side.
Therefore, when performing a gear shift operation to the reverse side, by performing a gear shift operation while lifting the restraint release member 17 connected to the upper side of the rod 19 so as to project downward of the grip portion 5a to the upper side with a finger, The pin 21 is located on the upper side of the restriction groove 23 and is configured to allow the backward operation.

A pair of push-operated switches 24, 2 as finger-operable drive command means for instructing the restraint release member 17 to drive the electric motor M in forward and reverse operation directions, respectively.
5 is provided. The outputs of the switches 24 and 25 are given to the control device 14, and when the forward switch 24 is pushed with the thumb in a state where the automatic on / off switch 15 is set to the off state, the control device 14 is pushed. The electric motor M is rotationally driven forward while the reverse side switch 25 is operated so that the electric motor M is rotationally driven backward. As shown in FIG. 3, the reverse switch 2
5 makes the protrusion height lower than the forward side switch 24,
It is configured so that it can be easily identified, and is prevented from being accidentally pushed by the palm when the forward gear shift operation is performed. When performing the reverse gear shift operation, the palm can be placed on the grip portion 5a and the finger can be used to lift the restraint release member 17 upward to operate the reverse gear switch 25 with the thumb.

It should be noted that reference numerals are added to the claims to facilitate the comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a front view showing a shift operation structure of a combine.

FIG. 2 is a side view showing the speed change operation structure of the combine.

FIG. 3 is a plan view of a switch mounting portion.

[Explanation of symbols]

 3 Continuously Variable Transmission Device 5 Gear Change Operation Tool 5a Grip Part 16 Checking Mechanism 17 Checking Release Member 24, 25 Drive Command Means H Shift Holding Mechanism M Actuator

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeki Hayashi 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory Co., Ltd. (72) Tamaki Naka, 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Co., Ltd. Inside the factory

Claims (2)

[Claims] 1. A speed change operation tool (5) is linked to a continuously variable transmission (3) for traveling, and an actuator (M) capable of speed change operation of the continuously variable speed change apparatus (3) is connected to the speed change operation tool (3). 5)
A work in which a gear shift holding mechanism (H) is provided in a state in which the gear shift operation by (5) is allowed, and a gear shift holding mechanism (H) is held in a state in which the gear shift operation by the gear shift operation tool (5) and the actuator (M) is allowed. A shift operation structure of a vehicle,
Work vehicle provided with finger-operable drive command means (24), (25) for causing the grip portion (5a) of the speed change operation tool (5) to instruct to drive the actuator (M) in forward and reverse operation directions, respectively. Shift operation structure. 2. The continuously variable transmission (3) is configured to be operable forward and backward, and the shift operation tool (5) is prevented from shifting from the forward shift range to the reverse shift range. The release operation member (17) of the restraint means (16) is lifted to the release operation position on the upper side by the finger with the palm placed on the upper surface of the grip portion (5a), and the grip portion (5) can be operated.
a), and the drive instruction means (24), (25)
The shift operation structure for a work vehicle according to claim 1, wherein the shift operation structure is attached to the release operation member (17).