JPS58136522A - Speed change operating device of agricultural tractor - Google Patents

Abstract

PURPOSE:To simultaneously operate steering and speed change with one hand, by arranging a speed change lever in a position below a steering handle. CONSTITUTION:An urging spring 21 is interposed between the part of a lever rod 4a of a speed change lever 4 and the upper part of a turning shaft 9, and the lever 4 is always urged in the direction to be positioned in the neutral side of a speed change guide groove. A guide device of the lever 4 is fixedly provided onto an instrument panel 10 of a dashboard, under a condition in which the operator touches the thumb of his hand to a steering handle 1, all of the other forefinger, middle finger, medical finger and the little finger or some of them are hooked to the lever 4 to lightly operate the handle 1 only by the tip of other fingers without releasing the hand, and speed change can be operated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a gear shift operating device for an agricultural tractor [- which is arranged directly below the steering handle, and which is operated by a finger other than the thumb of the left hand operating the steering handle; It also allows gear shifting operations, leaving the right hand free to operate the hydraulic operating lever, sub-shift lever, accelerator lever, etc.

In conventional agricultural tractors, the gear shift lever protrudes from the top of the transmission case, so when changing gears, it is necessary to hold the steering wheel with your left hand, bend over, and operate the gear shift lever with your right hand, making it unstable. It was required that the gears be operated in a comfortable position.

In order to solve these problems, the present invention brings the gear shift lever directly below the steering wheel, making it possible to operate the gear lever with the other fingers while hooking the steering handle with the thumb. At this time, the operating direction of the gear shift lever should be approximately the same as the circular rotation direction of the steering handle, and the grip part of the gear shift lever should protrude from the steering handle so that the fingers can easily touch the gear shift lever. Since the direction of movement of the gear is the same as the slope of the steering wheel, and the gear lever is operated using only the fingertips, the guide groove moves the reverse and first forward gears at the same height to avoid gear shifting errors. 2nd and 3rd forward speeds require cranking up one gear, and the gear lever is biased by a spring so that it always returns to the lowest neutral position.

The purpose of the structure of the present invention is as described above, and the detailed structure of the present invention will be explained based on the structure of the embodiment shown in the cancerous drawings.

FIG. 1 is a side view showing the structure of a gear shift operating device for an agricultural tractor, FIG. 2 is a rear view, FIG. 3 is a plan view of a gear lever guide, and FIG. 4 is a rear sectional view.

Agricultural tractors have an engine placed in the front hood, a clutch housing (351) fixed to the rear of the engine, and a transmission case (341) fixed to the rear of the clutch housing (G). While the main clutch device inside the clutch housing connects and disconnects,
Enter the mission case inside and open the mission case (3).
41, a hydraulic clutch type transmission device is used to change gears. Hydraulic directional control valve (A) selectively engages the hydraulic clutch of the hydraulic clutch type transmission.

It is done at

By rotating the arm (31j) protruding from the hydraulic direction control valve back and forth, the spool of the hydraulic direction control valve is moved back and forth, and the hydraulic clutch is selected.This arm (31) using the gear shift lever (4) device installed on the instrument panel (!01) on the bottom of the steering handle +11.
The gears can be changed with fingertip operation.

From the arm Ill side of the hydraulic directional control valve, insert the gear shift lever (
To explain the interlocking configuration up to 4), the arm (31)
The link (301) is pivotally connected to the pivot pin (361). The position of the pivot pin (361 can be adjusted to 11 points by means of two nuts and one lock nut. The front end of the link is connected to the armle 9). The arm Q9) is pivotally connected to the pivot shaft end arm 2η
It is fixedly installed.

The pivot shaft is pivoted to a pivot device (32) fixed to the front of the case of the hydraulic directional control valve.
The female screw body of the turnbuckle device (8) is pivotally connected to the turnbuckle device (8),
The turnbuckle device (8) is connected to the other female threaded body via the male threaded body.

The turnbuckle device (8) can be adjusted using the female screw body Mt24.
By loosening the force on the lock nut 1.3 and rotating the male threaded body, the position of the speed change lever and the position of the spool of the hydraulic directional control valve can be accurately matched. The tops of these link devices are covered with a cover (Bl), and these link devices are not visible from the outside, but if you remove the cover fil, you will see the turnbuckle device, (8)
The male threaded body (241 is pivotally connected to the arm (lη), and the arm aη is connected to the rotation support cylinder (7).
It is fixed perpendicularly to the inner rotation axis (9).

A sliding groove (9a) is provided at the tip of the rotation shaft (9),
The tip end rotation pin side of the speed change lever (4) is inserted into this groove (9a), and is prevented from being removed with a fixing member from above.

With this structure, the gear shift lever (4) can freely rotate up and down, but it can also rotate forward and backward with the rotation shaft (9).

The lever rod (4a) of the speed change lever (4) and the rotation shaft (9)
A biasing spring (21+'i) is interposed between the upper part of the shift lever (41) and the shift lever (41) is always biased in the direction to be located on the neutral side of the shift guide groove. It is a 12+H dash board, and a guide device of the gear shift lever (41) is fixedly installed on the instrument panel (lO) of the dash board (2), and the operator can
With the thumb of the hand (I) hooked on the steering handle fi+, all or several fingers of the other eight fingers, middle finger, ring finger, and little finger are hooked on the gear shift lever (4), and the hand is moved from the steering handle +11. It is possible to change gears by moving only with the tips of your fingers without releasing the lever.As shown in Figures 2 and 3, the tip of the gear shift lever (4)
It is configured to extend outward from the outer ITI of the steering handle (1) and to remove the rotation arc of j=[41/c, which is approximately the same circle as the circle of the steering wheel, when changing gears.

In addition, as seen in the side view of FIG. 1, the angle of inclination of the steering handle and the direction of rotation of the gear shift lever 141, that is, the direction in which the guide groove of the gear shift guide plate (6) extends, the direction of the steering handle. The direction of rotation of the gear shift lever (4) is approximately the same as the rotation of the steering wheel.

Also, the guide groove (6g) of the speed change guide plate (6) in Fig. 9
□ As seen in the shapes of (6h) and (6j), the 3rd forward speed and 2nd speed are placed on the topmost single guide (6g), and the 1st forward speed and reverse speed are placed on the middle guide (6h). ) (6j) A recess for the instep position (6j) is provided, which is located above and recessed one step lower between the first forward speed and the reverse speed. Therefore, the third forward speed and the second forward speed I don't have to suddenly go into reverse speed,
Conversely, it is impossible to shift from reverse speed to 2nd or 3rd forward speed all at once. Between the first forward speed and reverse speed,
It is possible to change gears in the neutral position without stopping the gear shift lever. Also, the neutral position is 4g6, which is one step down.
m) is provided, and the neutral position is reliably maintained by the aforementioned biasing spring 2υ and the lock fitting (6).

In this way, the gear shift operation device can be connected to the steering wheel.
On the instrument panel (lO) on the bottom of the steering wheel Il.
Since it is configured so that both the + and gear shift lever (4) can be operated, one hand on the left can operate the steering and gear shift, while the right hand can be used to operate the accelerator lever, turn signal switch (18°), and alarm buzzer. - Switch marks and operation of front light switch α9), etc.
In addition, you can also operate the hydraulic lever, PTO gear shift lever, auxiliary gear shift lever, etc.

Link to the governor device of the 13211d engine,
(33) is a link going to the foot accelerator pedal.

03) is a fuel tank.

Figure 5 is a plan view of the instrument panel (lO), Figure 6 is a rear view, Figure 7 is a side cross-sectional view, and Figure 8 is a rear view of the part where the speed change guide plate and rotation support cylinder are integrated. Cross section 1゛N, Figure 9 is a side view, Figure 1θ is a plan view, Figure 11 is a plan view of the guide plate cover (3), Figures 12, 13, and 14.
15 are a rear sectional view, a back view, a side view on the image side, and a rear side view. FIGS. 16, 17, and 18 are a plan view, a front view, and a side view of the lock fitting (5) of the speed change lever (4).

The instrument panel (10) is fixed to the mounting surface of the dash board (3). On the instrument panel (101, there is a speed tachometer (river, 6 alarm lamps 121), direction indicator switch (8)
, alarm buzzer switch (capital)), headlight switch α9)
etc. are arranged, and the steering shaft passes through the large hole (]Oa) in the center. Then, the speed change operation device of the present invention is attached to the inner hole (101) and the small hole (IOC).

The rotation support cylinder (7) in Fig. 8 is fitted into the inner part (10b),
The speed change guide plate (bolt α6) is inserted into the small hole (11)C through the hole (12b) in the fixing member mouth of 61, and is aligned with the instrument panel. To fix the speed change guide plate (6),
These bolts are the only ones that are attached to the instrument panel, and the lower end of the rotation support cylinder (7) is also fixed with an upper holding metal fitting (4 pieces).

A 1 m (6 g) guide is engraved on the side of the speed change guide plate (6), and the bottom is made of a fixing metal fitting (I), and the rotation support tube (7) is also fixed integrally with the fixing metal fitting (121). A guide plate cover (61) is provided on the gear shift guide plate (61).
3) Insert fixing pieces (3a) (3b) (3C) (3d) (
3e) insertion holes (12a), (6a), (6C), (6
), (6d) are provided, and the kite board cover (3)
is made of synthetic resin, so insert fixing piece (3a) (
3b) (3G) (3d) (3e) can also be assembled and removed just by pushing them. In addition to the guide 114 (6g), an inset (6b) and small holes (6e) (6f) are opened on the side of the speed change guide plate (61). Body H is inserted and the lock fitting (
5) It acts as a retainer when the lock is released.

In addition, the pivot pin (2) of the lock fitting (6) is inserted into the small hole (6f).
3I is inserted and is biased and pivotally supported by a spring 1221. In addition, the gear change guide plate (61 small hole (6e) has a 10th
As shown in the figure, a locking pin αn is provided protrudingly, and the locking metal fitting (6) locks the gear shift lever (4, locked in the neutral position so that it does not return. 16
As shown in the figure, there is an inclined surface (5b), so when you hook the handle (5a) of the lock fitting with your fingertips and turn it in the locking direction, it will ride on the inclined surface (5b) and the locking pin ( To release the lock fitting, fully tilt the lock fitting (6) against the spring 221 and remove it from the locking pin to release it freely.The lock fitting is elastic. It is held by the body (14).

As described above, the discord invention is based on the fact that the gear shift lever is located at a lower position of the steering handle where the thumb of the operator's hand can hang on the steering handle and the other fingers can touch the gear shift lever at the same time. The gear lever can be operated from the housing attached to the steering wheel, so one hand can be used for steering and shifting at the same time, while the right hand can be used for other operations, such as operating the hydraulic lever for work. 1411 & continuous lever +, PTO & speed lever, accelerator reno (-) etc. can be operated at the same time.

In addition, since the grip portion of the gear shift lever protrudes outward from the outer ring of the steering handle when viewed from above, the user can grasp the gear shift lever immediately by hooking the thumb on the steering handle and moving the other fingers downward. This means that when there is no need to shift gears, all you have to do is grip the steering wheel with all your fingers.

In addition, when viewed from the side, the 1st angle of the steering handle and the guide direction of the gear shift guide plate are made almost parallel, so you can put your thumb on the steering wheel and extend only your fingertips, or operate it forward or backward. You can move only the gear shift lever without moving the steering wheel, and apart from that, the gear shift lever will never be out of reach of your fingertips.

Also, in plan view, the arc of the steering wheel and
Since the arc for operating and rotating the gear shift lever is approximately the same circular shape, the gear shift lever can be operated back and forth as the steering wheel rotates, and the shift lever can be adjusted by using the free rotation width of the steering handle. It is possible.

In addition, the gear shift guide S of the gear shift lever is provided for the first forward speed and the reverse speed on a straight line in the longitudinal direction through the neutral position, and for the forward second and third speeds, move upward from the groove of the first forward speed. Since the groove is curved in the shape of a crank, the gear shift operating device of the present invention can be operated intuitively with only the fingertips without looking at the gear lever, and the shift lever can suddenly shift from reverse to third forward gear. On the other hand, there is no problem in which the operator is forced to change gears by suddenly switching from third forward gear to reverse gear, and the operator always has to check the crank once before changing gears.

In addition, the shift lever is always biased downward, and a downward neutral position recess is provided between the first forward speed and reverse speed, so that it is possible to shift to a lower gear and then to neutral. The lever is biased and is configured to move the gear shift lever toward safety even if a mistake is made.

[Brief explanation of drawings]

Figure 1 is a drawing showing the structure of the gear shift operating device for a continuous tractor, Figure 2 is a rear view, Figure 3 is a plan view of the gear lever guide, Figure 4 is a rear IFrm diagram, and Figure 5 is the instrument panel. The plan view of the plate (10), Figure 6 is also the back view, Figure 7
The figure is a side sectional view, FIG. 8 is a rear sectional view of the part where the speed change guide plate and rotation support cylinder are integrated, FIG. 9 is a side view, FIG. 10 is a plan view, and FIG. The plan view, FIGS. 12, 13, 14, and 15 of the guide plate cover (3) are also a rear sectional view, a back view, a front side view,
The rear side view, FIG. 16, FIG. 17, and FIG. 18 are a plan view, a front view, and a side view of the lock fitting (5) of the gear shift lever (4). (Publisher...Operator's hand (11...Steering handle (41...Shift lever (5)...Lock fitting (61...Shift guide plate (6g)...Guide string (forward 2nd Speed, 3rd
Continuous use) (61)...Neutral recess (6h) (6j)...Guide fermentation (first forward speed, reverse continuous use) Applicant Yanmar Diesel Co., Ltd. Agent Attorney Toshikazu Yano Figure 76 Figure 78

Claims (1)

[Claims] +11 A gear shift for an agricultural tractor, characterized in that the lever is arranged at a position below the steering handle where the thumb of the operator's hand can hang on the steering handle and the other fingers can touch the gear shift lever at the same time. Operating device. (2) The gear shift operation device for an agricultural tractor as set forth in claim 1, wherein the grasping portion of the gear shift lever protrudes outward from the outer ring of the steering handle in plan view. (3) The gear change operation device for a ditch tractor as set forth in claim 1, wherein the inclination of the steering handle and the direction of the guide groove of the gear change guide plate are substantially parallel when viewed from the side. (4) Gear shifting of the agricultural tractor according to claim 1, characterized in that, in plan view, the arc of the steering handle and the arc for operating and rotating the gear shift lever are substantially concentric circles. Operating device (6) The gear shift guide groove of the gear shift lever is provided on a straight line in the longitudinal direction via the neutral position between the first forward speed and the reverse speed, and the forward second speed and the third forward speed are connected to the forward Ml speed. A gear shift operation device for an agricultural tractor according to claim 1, characterized in that the groove is formed into a crank-shaped groove upward. 2. The gear shift operating device for an agricultural tractor according to claim 1, further comprising a recessed portion for a neutral position located downward between the reverse speed and the reverse speed.