JPS6261456B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to a clutch device for a large agricultural tractor.

(b) Prior Art Conventionally, a technique has been known in which a clutch pedal is suspended from a part of a dashboard in an automobile.

For example, see Utility Model Publication No. 51-11711.

(c) Problems to be solved by the invention In conventional medium-sized and small-sized agricultural tractors, the clutch housing and transmission case were small, so the operator rode astride them, and the clutch pedal was also used as a brake. Pedals were also placed on the left and right sides of the clutch housing.

However, with large agricultural tractors, the width of the clutch housing becomes too wide for the operator to straddle, forcing him to ride with his feet aligned on the clutch housing and transmission case.

In this case, the clutch pedal and brake pedal do not need to be placed with a wide gap between them; they need to be provided to match the width of the operator's feet.In the present invention, the clutch pedal and brake pedal are hung on the left and right sides of the dart board so that they can rotate freely. It is set up.

In such a structure, the interlocking structure from the clutch pedal to the clutch yoke requires a new configuration that matches this, and the present invention provides an opening on the top surface of the clutch housing, inserts a link from there, and connects the clutch yoke. This is a combination of a clutch pedal and a clutch pedal.

(d) Means for Solving the Problems The objects of the present invention are as described above, and the configuration for achieving the objects will now be explained.

Place the upper part of the clutch pedal 33 on the dash board 3.
The link 2, which is suspended near the clutch pedal 33 and moves up and down in conjunction with the depression operation of the clutch pedal 33, is inserted into the opening 1a provided in the center of the upper surface of the clutch housing 1, and the lower end of the link 2 is connected to the traveling clutch device. 2
The clutch release bearing 13 of No. 2 is directly connected to the clutch yoke 3 that moves the clutch release bearing 13 back and forth.

(E) Embodiment The object and structure of the present invention are as described above. Next, the structure of the embodiment shown in the attached drawings will be explained.

Figure 1 is a side cross-sectional view of the dart board of an agricultural tractor, Figure 2 is a side cross-sectional view of the clutch housing without a height-low transmission, and Figure 3 is a side cross-sectional view of the clutch housing with a height-low transmission installed in the rear half of the clutch housing. FIG. 4 is a rear sectional view of the clutch yoke portion.

In FIG. 1, a steering handle 31 protrudes from a dart board 32, a clutch pedal 33 is pivotally supported on the left side of a part of the dart board 32, and left and right steering brake pedals are mounted on the right side of the same pivot shaft 34. It is pivotally supported.

The clutch pedal 33 is depressed by the arm 35,
The arm 38 moves up and down via the link 36 and arm 37.

The link 2 is pivotally connected to the arm 38. The link 2 enters the clutch housing 1 through the upper opening 1a of the clutch housing 1 and is pivotally connected to one end of a clutch yoke 3 which is pivotally supported by a pivot shaft 4. 1b is a rubber boot that prevents dust from entering the clutch housing 1 as shown in the drawing of the link 2.

In FIG. 2, the clutch yoke 3 rotates as the link 2 moves up and down, causing the sliding body 11 to move back and forth, the clutch release bearing 13 to move back and forth, and the arm 23 of the traveling clutch device 22 to rotate back and forth. be.

The arm 40 rotates in conjunction with depression of the clutch pedal 33 shown in FIG. 1, and the links 41 and 42 move back and forth by the arm 40, thereby braking the inertial slip prevention brake device of the travel drive shaft 6.

In cases where a height/low speed change device is not provided as shown in Figure 2, braking is performed using a mechanical brake device, and in cases where a hydraulic clutch type height/low speed change device is installed as shown in Figure 3. This is a hydraulic brake device that presses a brake body against the outer periphery of the hydraulic clutch case.

In this case, the link 42 linked to the arm 40 in FIG. 1 is hydraulic, and a hydraulic control valve is actuated via a bell crank 44.

In FIG. 2, the clutch housing 1 is fixedly installed on the rear surface of the engine 30.
A transmission case is fixed to the rear of the unit.

A PTO drive shaft 5 is extended to a flywheel 21 of an engine 30 via a fixed flange 20,
The PTO drive shaft 5 is connected to the PTO via the coupling ring 27.
It is connected to a transmission shaft 26.

Further, a traveling clutch device is brought into contact with the rear surface of the flywheel 2 to connect and disconnect the traveling power. The traveling power is transmitted to the traveling drive shaft 6.

A projecting wall 17 is provided at the center of the clutch housing 1, and a projecting portion 17 extends forward from the projecting wall 17.
A sliding guide 8 of the sliding body 11 is extended to a.

Further, when the height change gear is not arranged, the rubber cover 12 is fitted into the bearing hole 17b of the counter shaft 52.

The inertia slip prevention brake of the traveling drive shaft in FIG.
rotates forward, pushing the press plate 9 and opening the friction plate 16. When the clutch is disconnected, shifter 29
moves backward in conjunction with the depression of the clutch pedal,
Pressing the pressure plate 9 against the friction plate 16 with a spring,
This stops the wheel from idling when the clutch is disengaged.

In the case shown in FIG. 3, a counter shaft 52 and hydraulic clutch devices A and B are provided in the rear half chamber of the clutch housing 1, and these are operated in opposite directions at once to perform high and low speed changes.

In the case of high speed, hydraulic clutch device A is engaged and hydraulic clutch device B is disengaged, and the power is transferred to the traveling drive shaft 6.
from the hydraulic clutch case to the traveling transmission shaft 62.
is transmitted to the fixed gear.

Conversely, in the case of low speed, hydraulic clutch device B is engaged, hydraulic clutch device A is disengaged, and the power is transferred to fixed gear 4.
7. It is transmitted to the traveling transmission shaft 50 by the loose gear 48, the hydraulic clutch device B, the counter shaft 52, and the fixed gears 49 and 46. 55 and 56 are needle bearings that support the rear end of the PTO drive shaft 5.

Since it becomes difficult to support the shaft and cylinder shaft when a height change gear is installed, bearing bodies 50 and 51 are fixed to the rear surface of the clutch housing 1.

53 is a cover with an oil passage, and 45 is a lubricating oil injection port.

As shown in FIGS. 2 and 3, the rear half of the clutch housing is partitioned off in an oil-tight manner by a protruding wall 17, so that it is possible to change speeds with or without high-low speed change.

In FIG. 4, the position of the link 2 in the left-right direction is shown, and an opening 1a is provided at the left-right center of the upper surface of the clutch housing 1.

(F) Effects of the Invention Since the present invention is configured as described above, it has the following effects.

First, in the clutch device of an agricultural tractor, the clutch pedal is suspended near the dart board, and the link 2, which moves up and down in conjunction with the clutch pedal, is inserted from above the clutch housing 1 into the opening 1a opened in the clutch housing 1. Since the clutch yoke is inserted, there is no longer a need to operate the clutch yoke via a long link or arm as in the past.

Second, the upper opening 1a of the clutch housing 1
Since the link 2 is inserted from the front, the arm and link are not placed in the position of the operator's feet, improving the feeling of living.

Third, the link 2, which moves up and down in conjunction with the depression of the clutch pedal 33, is directly connected to the clutch yoke, eliminating twisting and friction between the link and arm, allowing the clutch to be operated with a light depression. This is how it came to be.

[Brief explanation of the drawing]

Figure 1 is a side sectional view of the dart board of an agricultural tractor, Figure 2 is a side sectional view of the clutch housing without the height/lower transmission, and Figure 3 is the side sectional view of the clutch housing with the height/lower transmission installed in the rear half of the clutch housing. FIG. 4 is a rear sectional view of the clutch yoke portion. A, B...Hydraulic clutch device, 1...Clutch housing, 1a...Opening, 2...Link, 3...
...Clutch yoke, 33...Clutch pedal.

Claims (1)

[Claims] 1. The upper part of the clutch pedal 33 is suspended below the dash board 32, and the link 2, which moves up and down in conjunction with the depression operation of the clutch pedal 33, is inserted into the opening 1a provided at the center of the upper surface of the clutch housing 1. A clutch device for an agricultural tractor characterized in that a lower end of a link 2 is directly connected to a clutch yoke 3 that moves a clutch release bearing 13 of a traveling clutch device 22 back and forth.