JPH0722528Y2 - Speed change operation structure of work vehicle with vehicle speed control - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] In order to maintain the work load during harvesting work within a set range, for example, in the case of a reaper harvester, the present invention is based on the detection load of the machine speed. TECHNICAL FIELD The present invention relates to a gear shift operation structure of a work vehicle with vehicle speed control configured to be automatically controlled.

[Conventional technology]

Conventionally, as the above-mentioned speed change operation structure, a first operation member connected to an artificial operation tool for traveling speed change and a second operation member connected to a hydrostatic continuously variable transmission apparatus for travel are arranged in a butt state. At the same time, an initial pressure contact spring for holding the end portion of the first operating member and the end portion of the second operating member facing the end portion in contact with each other is connected to the first operating member. The two operating members are interlockingly connected by interposing between the bottom surface of the distal end portion of the tubular body and the end portion of the second operating member inserted into the tubular body, and the first operating member in the decelerating direction. The second operating member is directly contacted with the second operating member, and the operating force of the first operating member is transmitted to the second operating member via the spring in the forward speed increasing direction, and based on the work load detection information. The artificial operating tool to keep the work load within the set range. An automatic control means for automatically operating by an actuator is provided, and when the manual operation tool exceeds the operation position corresponding to the maximum forward speed by the hydrostatic stepless transmission, the dynamic control means is operated to increase the speed. There is one that is provided with an upper limit restraint means for restraining the operation.

In the above speed control, when the forward speed increase control is performed with a large reduction of the work load, even if the human-controlled actuator is operated by the electric actuator to the maximum forward speed position which is the upper limit of the hydrostatic stepless transmission. If there is still a load,
The forward speed increase control may still be performed, and the electric actuator may be burnt out. Therefore, in the above-described conventional structure, the manipulator can be operated over until it exceeds the operation position corresponding to the maximum forward speed by the hydrostatic stepless transmission.
The mechanism that mechanically links the manual operation tool and the hydrostatic continuously variable transmission forms a flexibility using a spring, and when the manual operation tool is operated by the electric actuator against the spring, the forward movement is increased. Speed control is avoided in advance.

Further, conventionally, the first operating member connected to the manual operation tool and the second operating member connected to the hydrostatic continuously variable transmission are simply interlocked and connected via a spring.

[Problems to be solved by the device]

By the way, in the hydrostatic continuously variable transmission, a slight vibration occurs on the operation shaft of the transmission due to the pulsation of the reaction force of the plunger acting on the swash plate that changes the pressure oil discharge amount of the axial plunger type variable displacement hydraulic pump. Occurs, and this slight vibration is transmitted to the manual operation tool through the abutting position between the first operating member and the second operating member, or contacts at each connecting position such as the connecting portion between the first operating member and the second operating member. Noise may be generated, which may make the operator uncomfortable.

An object of the present invention is to suppress the transmission of minute vibrations of the operation shaft of the hydrostatic continuously variable transmission to the manual operation tool side and the generation of noise.

[Means for Solving the Problems]

A shift operation structure for a work vehicle with vehicle speed control according to the present invention includes a first operation member connected to an artificial operation tool for traveling speed change and a second operation member connected to a hydrostatic continuously variable transmission for travel operation. And an automatic control means for automatically operating the manual operation tool by an electric actuator so as to maintain the work load within a set range based on the work load detection information. Is a work vehicle with vehicle speed control provided with upper limit restraint means for restraining the operation of the automatic control means toward the speed increasing side in a state where the operating position corresponding to the maximum forward speed by the hydrostatic stepless transmission is exceeded. In the disguise operation structure, the first operation member and the end of the second operation member facing the first operation member are held in contact with each other, and a spring for initial pressure contact is contacted to perform both operations. Parts Kinematic connecting, the second operating member directly contacts and those operated by the first operating member in the forward deceleration direction, the first through the spring to the forward speed increasing direction
The operation force of the operation member is transmitted to the second operation member, and a vibration absorbing member is provided between the end portion of the first operation member and the end portion of the second operation member located opposite to the end portion. A characteristic feature is that a vibration-proof rubber material is provided.

The operation and effect of the above characteristic configuration are as follows.

[Action]

With the above structure, even if a slight vibration occurs due to the rotation of the operation shaft of the transmission, the slight vibration is effectively generated by the vibration isolating rubber material provided between the first operating member and the second operating member. The vibration of the manual operation tool and the generation of noise at each connection point are suppressed.

[Effect of device]

Therefore, it is possible to perform a manual operation of slight vibration caused by the hydrostatic stepless transmission by a simple modification that only a rubber material for vibration isolation is provided between the end of the first operating member and the end of the second operating member. It has become possible to control comfortably by suppressing the transmission to tools and noise generation.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 6 shows the front of the combine with the cabin (K). As shown in FIG. 2, a driver's seat (2) is provided on a box-shaped engine bonnet (1) whose inner side is open, and the driver's seat (2) is provided.
Operation panel (5) provided on the lateral side of the body of the vehicle
The operating levers (3) and (4) which can swing freely are provided on the shaft.

As shown in FIG. 2, the output of the engine (E) housed in the engine bonnet (1) is transferred to the transmission belt (6).
Input to a hydrostatic continuously variable transmission (hereinafter abbreviated as continuously variable transmission) (7) via a gear, and its output is transmitted via a gear transmission case (8) to a crawler traveling device (9).
Be transmitted to.

The support structure of the continuously variable transmission (7) will be described. As shown in FIGS. 4 and 5, the tubular member (11) is welded to the transmission mounting member (10) to form the tubular shape. Material (1
Two cylindrical bosses (12) and (13) are fitted in the inside of (1), and an annular rubber (14) for absorbing vibration is baked between the two cylindrical bosses (12) and (13). Then, a pair of front and rear brackets (17) welded to the inverted L-shaped support member (16) below the support frame (15) fixed to the machine body,
The tubular member (11) is inserted and arranged between the brackets (17), and both brackets (17) and (17) and the tubular member (1) are arranged.
A pin (18) is fitted in 1).

Of the operation levers (3) and (4), the operation lever (3) located on the right side is a main speed change operation lever for operating the continuously variable transmission (7) to change gears, and the operation located on the left side. The lever (4) is a sub-transmission operation lever that shifts the gear transmission mechanism in the gear transmission case (8) between high and low stages.

The linking structure of the main speed change lever (3) and the continuously variable transmission (7) will be described in detail. As shown in FIGS. 1 and 2, the main speed change lever (3) is provided at the base of the main speed change lever (3). A first rod (20) as a first operating member connected to the arm (19), and an operating arm (22) of the continuously variable transmission (7).
A second rod (21) as a second operation member connected to the first rod (20) in a butted state, and the second rod (2) located opposite the end of the first rod (20).
Both the rods (20), (21) through the spring (23) for initial pressure contact for holding the end of 1) in contact with each other.
The second rod (21) is directly abutted by the first rod (20) in the forward / reverse direction, and the first rod (20) is in the forward / increase direction via the spring (23). Is configured to be transmitted to the second rod (21).

As shown in FIG. 3, a work load detection sensor (2 that comprehensively detects threshing load, running load, etc. as engine load).
4), the potentiometer (25) for detecting the operation position of the main shift operation lever (3), the main shift operation lever (3) exceeds the operation position corresponding to the maximum forward speed by the continuously variable transmission (7). A control device (28) to which information is input from the limit switch (26) for detecting the fact that the automatic control switch (27) is started to automatically start the continuously variable transmission (7). In addition to installing the main transmission operating lever (3), the friction transmission mechanism (29)
An electric motor (30) is provided as an electric actuator that is operated via.

The control device (28) includes the work load detection sensor (2
An automatic control means (3) for automatically operating the main shift operation lever (3) by the electric motor (30) so as to maintain the work load within a set range based on the detection information of (4).
1) The limit switch (26) indicates that the main gearshift operation lever (3) has been overoperated beyond the operating position corresponding to the maximum forward speed by the continuously variable transmission (7).
An upper limit restraint means (32) for restraining the operation of the automatic control means (31) toward the speed increasing side is detected when the above is detected.

Therefore, when the automatic control switch (27) is switched to the automatic control side, the electric motor (so as to maintain the work load within the set range based on the detection information of the work load detection sensor (24) and the potentiometer (25). Control device to (30) (28)
A control signal is output from the automatic transmission and the main transmission lever (3) is automatically operated. When the limit switch (26) detects that the main transmission lever (3) has been operated beyond the operating position, the automatic control means is prevented from restraining the operation toward the speed-up side.

As shown in FIG. 1, between the end portion of the first rod (20) and the end portion of the second rod (21), a rubber elastic body for absorbing vibration, that is, a vibration isolating rubber material ( 33) is provided.

More specifically, the lower surface of the donut-shaped first plate member (34) welded to the end portion of the first rod (20) and the second rod (2
The second rod (2) is slidably fitted in the tubular member (37) welded to the first plate member (34) at the end of (1).
Donut-shaped second plate member (3) welded to the end of 1)
The anti-vibration rubber material (33) is interposed between the upper surface and the upper surface of (5). The spring (2) is provided between the lower surface of the second plate member (35) and the upper surface of the donut-shaped third plate member (36) which is supported by the lower portion of the tubular member (37) so as not to come off.
3) is installed.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a gear shift operation structure of a work vehicle with vehicle speed control according to the present invention. Fig. 1 is a sectional view of an essential part, Fig. 2 is a longitudinal side view of a control part, and Fig. 3 shows a control structure. Schematic, 4th
FIG. 5 and FIG. 5 are cross-sectional views of the main part, and FIG. 6 is a side view of the combine front part. (3) …… manual operation tool, (7) …… hydrostatic stepless transmission, (20), (21) …… operation member, (23) …… spring, (30) …… electric actuator, ( 31) …… Automatic control means, (32) …… Upper limit restraint means, (33) …… Vibration-proof rubber material.

Front page continued (72) Inventor Futa Ikeda 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Iron Works Co., Ltd. Sakai Works (56) References Japanese Patent Publication No. JP, B2)

Claims (1)

[Scope of utility model registration request] 1. A first operating member (20) connected to an artificial operating tool (3) for traveling and a second operating member (21) connected to a hydrostatic continuously variable transmission (7) for traveling. ) And are arranged in a butt state, and the manual operation tool (3) is automatically operated by the electric actuator (30) so as to maintain the work load within the set range based on the work load detection information. A control means (31) is provided, and the automatic control means (31) is increased in a state where the artificial operation tool (3) exceeds an operation position corresponding to the maximum forward speed of the hydrostatic stepless transmission (7). In a gear shift operation structure of a work vehicle with vehicle speed control, which is provided with an upper limit restraint means (32) for restraining the operation toward the high speed side, an end portion of the first operation member (20) and the second portion positioned opposite to the end portion thereof. Initial pressure contact to keep the operating member (21) in contact with the end Wherein both the operating member through a spring (23) (20), (21) and operatively connected to, the second operating member by the first operating member (20) is the forward deceleration direction (21)
Is configured to be directly contacted with and to transmit the operating force of the first operating member (20) to the second operating member (21) through the spring (23) in the forward speed increasing direction,
The end portion of the first operating member and the second portion located opposite to the end portion.
A gear shift operation structure for a work vehicle with vehicle speed control, comprising a vibration-damping rubber material (33) for absorbing vibration between the end portion of an operation member (21).