JPS63145131A - Clutch housing for tractor - Google Patents

Abstract

PURPOSE:To make a lifting stroke of a rotary mover unit, going up to a position being engaged with a universal joint shaft, enlargeable, by tightly installing a bottom plate of a transmission case in a stretching frame as high as possible. CONSTITUTION:A clutch case 3 at the front end is tightly installed in the rear surface of an engine E, and it is one that contains a flywheel of this engine E. And, a rear end flange 24 at the rear end is one that is combinedly connected to a transmission case M or an oil passage case 23 in front of this transmission case, and an interval between both is connected by a portal power transmission case 1. A bottom plate 2 is installed in this power transmission case 1.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to the structure of a press-made clutch housing used in a small tractor.

(B) Prior Art Conventionally, in small tractors, it has been known that the clutch housing is constructed of a press-made clutch case, a transmission case, a rear end flange, etc., and integrated by spot welding.

However, in the conventional technology, because the bottom plate installed inside the mouth-shaped transmission case is located low, the front wheel power take-off shaft,
The position of the universal joint shaft became higher, which caused problems such as the inability to take a large vertical stroke of the mid-mounted rotary mower device R.

There were also other problems, such as the strength of the skirt portion of the transmission case being weak.

In addition, when using a press-made clutch housing, there was a problem in that there was no part with reliable strength where the steering valve case and flow divider could be placed.

(c) Problems to be solved by the invention In the present invention, the bottom plate 2 installed inside the transmission case
By making the position as high as possible, the space below is enlarged and this area is used as a passage for the front wheel power take-off shaft 25 and the universal joint shaft 26. By raising these positions, the rotary The lifting stroke of the mower device R is increased, and the clutch case 3 is
By arranging the flow divider 5 above and arranging the steering valve case 29 above the transmission case 1 at the rear thereof, the strength of the clutch housing in the press section is sufficiently reinforced.

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

In a clutch housing that connects the engine and the transmission case, which is constructed by welding press parts, a mouth-shaped transmission case is fixed between the clutch case and the rear end flange, and the transmission case passes through the transmission case. A bottom plate is fixedly provided below and above the clutch shaft as much as possible, and a pedal support cylinder is fixedly mounted across the skirt portion of the transmission case that projects downward from the bottom plate.

Additionally, a flow divider is placed between the steering valve case and the engine on the top surface of the clutch case to separate the pressure oil from the hydraulic pump driven by the engine into the hydraulic case and the steering valve case. It is.

(E) Embodiment The object and structure of the present invention are as described above. Next, the structure for achieving the object will be explained.

FIG. 1 is a side sectional view of the clutch housing of the present invention, FIG. 2 is a rear sectional view, FIG. 3 is a plan view showing hydraulic piping in the vicinity of the clutch housing, FIG. 4 is a side view, and FIG. - Figures 6, 7, and 8 are a plan view, side sectional view, rear view, and front view of the clutch housing of the present invention.

The structure of the pressed clutch housing will be explained based on the drawings of FIGS. 5 to 8.

The clutch housing is constructed by fixing parts by welding, all of which are constructed by pressing steel plates.

The clutch case 3 at the front end is fixed to the rear of the engine E.
It houses the flywheel of engine E. Further, the rear end flange 24 at the rear end is connected to the transmission case M or the oil passage case 23 in front of it, and the transmission case 1 of the same type connects the two. A bottom plate 2 is installed inside the transmission case 1.

If the bottom plate 2 is fixed at a too low position, the positions of the front wheel power take-off shaft 25 and the universal joint shaft 26, which will be described later, will be lowered accordingly, so it is best to position the bottom plate 2 as high as possible. However, if the height is too high, there will be no reinforcing portion of the skirt portion 1a extending downward, and the strength of this portion will decrease.

In the present invention, by making the bottom plate 2 higher, a sufficient space is secured below, and in order to solve the problem that the strength of the skirt portion 1a is reduced, a pedal support tube is provided in the skirt portion 1a below the bottom + Ji 2. 4 is fixed across the bridge, thereby reinforcing the strength of the skirt section la.

In addition, each part of the clutch housing of the press section is reinforced.

A mounting table 11 for a flow divider 5 is provided on the upper surface of the clutch case 3, and a box-shaped mounting table 8 for a steering valve case 29 is fixed on the upper surface of the joint between the clutch case 3 and the transmission case 1. It is. Further, diagonal reinforcing plates 9 are provided between the mounting table 8 and the mounting table 11 to reinforce the bending stress concentration area between the clutch case 3 and the transmission case 1.

Further, the reinforcement plate 14 is used to strengthen the rear end of the transmission case 1 and the rear end flange 24 against concentration of bending stress. Further, the lower side of the transmission case l and rear end flange 24 is reinforced by reinforcement Fi14. Further, the lower sides of the clutch case 3 and the transmission case l are reinforced by connecting the left and right work equipment mounting brackets 15 and 16, and connecting and reinforcing the left and right skirt portions 1a and the lower surface of the clutch case 3. It is.

In addition, the lower part of the frame constructed between the transmission case 1 and the bottom plate 2 is the skirt part 1a, which is weak in strength, so a pedal support cylinder 4 is installed across and fixed between the left and right skirt parts 1a to improve the strength. This is what we are trying to achieve. Further, on the outer periphery of the left skirt portion 1a, a bracket 19 to which a starting safety switch 18 is attached, and a bearing tube 17 into which a clutch operating shaft of a front wheel power take-off shaft 25 is loosely fitted are fixedly provided.

Further, on the upper surface of the transmission case 1, a bearing sleeve 10 is fixedly provided, into which an operating rod of a speed change lever provided at a steering handle portion is fitted.

Further, on the upper side of the bottom plate 2, bearing sleeves 12, 12, into which the release shaft 40 of the main clutch device 20 is inserted, are fixedly installed.

Next, let me explain about Figures 1 and 2.

A clutch pedal 28 is supported on the left side of the pedal support tube 4. The operating piece is configured so that when the clutch pedal 28 is depressed, the starting safety switch 18 is turned ON-OFF. Further, when the clutch pedal 28 is depressed, the bearing cylinder 12 and 1 are connected via the link and the arm.
The second release shaft 40 rotates to move the release bearing 27 back and forth. The main clutch device 20 is then connected and disconnected by the back and forth movement of the release bearing 27.

Another brake shaft is fitted into the pedal support tube 4, and the left and right brake pedals are arranged side by side on the right side of the clutch housing.

In addition, the operating rod of the gear shift lever is fitted in the bearing sleeve 10 provided on the upper surface of the transmission case 1, and extends out of the case at the rear end of the transmission case 1 through a link 22 inside the transmission case 1. The arm rotates the arm on the wall of the mission case M, and then enters the inside of the mission case M to operate the speed change valve and speed change shifter.

As shown in FIG. 1, a front wheel power take-off shaft 25 protrudes from the transmission case M, and a universal joint shaft 26 is pivotally connected in front of it to drive the front wheels.

The rotary mower device R is mid-mounted on the lower side of the universal joint shaft 26 and is configured to be movable up and down.

Next, the piping configuration of the hydraulic system will be explained with reference to FIGS. 3 and 4.

Two low pressure pipes 30 from the bottom of the mission case M.
38 appears. One is sucked into the oil passage case 23 and enters the hydraulic pump of the hydraulic clutch type transmission. The other low pressure pipe 30 is connected to the line filter 6
The oil is then sucked into the hydraulic pump 7 through the low pressure pipe 31. Pressure oil discharged from the hydraulic pump 7 is transferred to the high pressure pipe 3
2, oil is sent to a flow divider 5 provided on a mounting table 11 above the clutch case 3. The flow is divided by the flow divider 5, and one part is sent to the steering valve case 29 via a high pressure pipe 35, and the other part is sent to the hydraulic case 39 via a high pressure pipe 34.

Drain oil from the steering valve case 29 and drain oil from the flow divider 5 are returned into the transmission case M via pipes 36 and 33.

By operating the pulp in the steering pulp case 29 by rotating the steering handle, the front wheel, which is the steering wheel, is rotated.

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

First, by fixing the bottom plate 2 of the transmission case 1 at the highest possible position, the front wheel power take-off shaft 25 and the universal joint can be mounted under the bottom plate 2 to the highest possible position. The shaft 26 can be disposed, and the vertical stroke of the rotary mower device R, which ascends to a position where it engages with the 8-inch universal joint shaft 26, can be increased.

Secondly, by arranging the bottom plate 2 as high as possible within the transmission case 1, the portion of the skirt portion 1a below the bottom plate 2 becomes longer and weaker in terms of strength. By extending the pedal support tube 4 between the skirt portions 1a and fixing the pedal support tube 4, the strength of the skirt portion 1a can be improved.

Thirdly, by arranging the flow divider 5 above the clutch case 3 at the front of the steering valve case 29 at the rear of the engine E, one of the high pressure pipes after being divided by the flow divider 5 is on the right side of the clutch housing.
This allows the drain pipe for the other return oil to be placed separately on the left side of the clutch housing.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of the clutch housing of the present invention, FIG. 2 is a rear sectional view, FIG. 3 is a plan view showing hydraulic piping in the vicinity of the clutch housing, FIG. 4 is a side view, and FIG. - Figures 6, 7, and 8 are a plan view, side sectional view, rear view, and front view of the clutch housing of the present invention. l...Transmission case 1a...Skirt portion 2...Bottom plate 3...Clutch case 4...Pedal support cylinder 5...Flow divider 7...Hydraulic pump 8...Placement table application Person Yanmar Diesel Co., Ltd. Agent Patent Attorney Toshikazu Yano Figure 8 Figure 7

Claims (2)

[Claims] (1) In a clutch housing that connects the engine and the transmission case, which is constructed by welding press parts, between the clutch case and the rear end flange,
A mouth-shaped transmission case is fixed, a bottom plate is fixed as far as possible below and above the clutch shaft passing through the transmission case, and a pedal support cylinder is attached to the skirt portion of the transmission case that protrudes downward from the bottom plate. A tractor clutch housing characterized by a fixed bridge. (2) On the upper surface of the clutch case according to claim 1, at a position between the steering valve case and the engine,
A tractor clutch housing characterized by having a flow divider arranged to divide pressure oil from a hydraulic pump driven by an engine into a hydraulic case and a steering valve case.