JP2003237391A - Main clutch drag prevention device for tractor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a durable drag prevention device for a dry multiple disk clutch device of a tractor. <P>SOLUTION: A tractor transmits power of an engine 3 to a transmission case 23 via a dry multiple disk type main clutch device 22. A clutch takeoff shaft 29 of the main clutch device 22 and a transmission input shaft 30 of the transmission case 23 are projected into axial alignment and are integrally rotatably coupled with a connecting cylinder 31. Outer rings 32a and 33a of a front and a rear bearing 32 and 33 fitted around the connecting cylinder 31 are pressed longitudinally to retard rotation of balls 32c and 33c of the front and rear bearings 32 and 33, with the results that the clutch output shaft 29 is braked and that the outer rings 32a and 33a of the front and rear bearings 32 and 33 are supported against rotation. <P>COPYRIGHT: (C)2003,JPO

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation preventing device for a main clutch device in a tractor. 2. Description of the Related Art In a tractor for transmitting power from an engine to a transmission case via a dry-type multi-plate main clutch device, a brake is added to the tractor to turn around due to friction when the main clutch is off. Was. [0005] As described above, in the case where a normal brake device is provided to prevent the main clutch from rotating, there is a problem that the durability of the brake device is inferior. Was. Accordingly, the present invention is intended to embody a highly durable brake device for preventing the main clutch from rotating. [0004] In order to solve such a technical problem, the invention according to claim 1 is directed to transmitting power of an engine 3 to a transmission case via a dry multi-plate main clutch device 22. In the tractor for transmitting power to the transmission 23, the clutch take-out shaft 29 of the main clutch device 22 and the transmission input shaft 30 of the transmission case 23 are projected so as to coincide with the center of the shaft.
Are connected by a connecting cylinder 31 so as to rotate integrally, and a pair of front and rear bearings 32 and 33 are fitted to the connecting cylinder 31 to form outer rings 32 a and 3 of the front and rear bearings 32 and 33.
3a is pressed from the front-rear direction, and the front and rear bearings 32, 3
, 33c,.., And the outer rings 32a, 33a of the front and rear bearings 32, 33 are supported so as not to rotate. According to the first aspect of the present invention, the balls 32c,... Are pressed by the front portion of the inner peripheral surface of the outer ring 32a of the front bearing 32 and the rear portion of the inner peripheral surface of the inner ring 32b of the front bearing 32. By pressing the balls 33c,... At the rear portion of the inner peripheral surface of the outer ring 33a and at the front portion of the inner peripheral surface of the inner ring 33b of the rear bearing 33, the balls 33c,.
, 33c,..., A predetermined pressure brake is applied to the clutch output shaft 29 via the inner rings 32b, 33b. According to the first aspect of the present invention, the main clutch device 22 is provided.
When the clutch is turned off, the front and rear bearings 32, 3
The brake is applied to the clutch output shaft 29 from the outer races 32a, 33a through the balls 32c, 33c and the inner races 32b, 33b to prevent the clutch take-out shaft 29 from rotating around and smooth the shift when the main clutch is OFF. Rotational unevenness due to pulsation during idling rotation of the engine can be reduced. Also, the balls 32c,..., 33c,... Apply braking while rolling on the outer races 32a, 33a and the inner races 32b, 33b of the front and rear bearings 32, 33, thereby preventing uneven wear of the balls and improving durability. Can be enhanced. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention, in which the present invention is folded into a main clutch of a moving vehicle such as a tractor, will be described below. The moving vehicle is a riding four-wheeled tractor 1 as shown in the figure, and has an engine 3 mounted above a front portion of an airframe 2 that is long in the front-rear direction. A front axle case 4 is attached to the front lower part of the fuselage frame 2 so as to swing left and right around a center pivot, and left and right front wheels 5 and 5 are attached to both ends of the front axle case 4 via king pins so as to be steerable. The left and right front wheels 5 and 5 are steered by a steering handle 6. A rear left and right rear axle is mounted on a rear traveling transmission case 7 provided at a rear portion of the body frame 2, and left and right rear wheels 8, 8 are attached to both ends of the left and right rear axle. . An outer peripheral portion of the engine 3 is covered with a hood 9 and a side cover 10, and the steering handle 6 is disposed above a rear portion of the hood 9. A seat 12 is provided above the body frame 2 and the rear traveling transmission case 7 via a seat box 11, and a step 13 is provided between the seat box 11 and the side cover 10 so as to cover above the body frame 2. Provided. The engine 3 has a crankshaft arranged in the front-rear direction, extracts power from an extraction shaft 14 projecting forward of the engine 3, and transmits power to a counter gear case 17 via a belt transmission device 15 and a transmission shaft 16. Then, the power for the working machine and the power for traveling are branched by the counter gear case 17 and the power for the working machine is transmitted to the control pump 21 via the working machine transmission shaft 18, the working machine belt transmission 19, and the working machine clutch 20. It is transmitting. Further, a first PTO shaft 46 that is always rotating is provided at a rear end of the work machine transmission shaft 18. The traveling power branched from the counter gear case 17 is transmitted to a hydraulic multi-plate clutch device (not shown) in a transmission case 23 via a main clutch device 22, and the hydraulic multi-plate clutch device switches between forward and reverse. The transmission is transmitted to a sub-transmission gear group (not shown) in the transmission case 23 to perform a sub-speed transmission, and is further shifted to a high or low speed by a main transmission gear group (not shown). The speed-changed power is transmitted to a traveling output shaft (not shown), a rear wheel traveling transmission shaft 24, and a rear traveling transmission case 7.
The transmission is transmitted to the left and right rear wheels 8, 8 via the inner gear group, and is transmitted from the traveling output shaft (not shown) to the left and right front wheels 5, 5 via the front wheel traveling transmission shaft 25. In the transmission case 23, the power of the second working machine is branched,
Power is transmitted from the work implement take-out shaft 26 via the second work implement transmission shaft 27 to a second PTO shaft 28 provided at the rear of the rear traveling transmission case 7. A work machine (not shown) is connected to a hitch (not shown) at the rear of the machine so as to be able to move up and down, and the work machine (not shown) is moved up and down by a lift arm (not shown). Power is transmitted from a second PTO shaft 28 provided at a rear portion of the power tool to a working machine (not shown). Next, a description will be given of a clutch-equipped anti-rotation device of the main clutch device 22 with reference to FIGS.
The power inputted / disengaged by the dry multi-plate main clutch device 22 is taken out from the clutch take-out shaft 29, and the transmission input shaft 30 is projected from the front part of the transmission case 23 to the clutch take-out shaft 29 so as to coincide with the axis. Thus, the clutch take-out shaft 29 and the transmission input shaft 30 are spline-fitted to the connection cylinder 31 so as to rotate integrally. The connecting cylinder 31 is supported by a pair of front and rear bearings 32, 33, and a ring spring 34,
34, outer ring 3 of front and rear bearings 32, 33
2a, 33a are supported by front and rear pressing bodies 35, 36,
The front / rear pressing bodies 35, 36 are connected to bolts / nuts 37, 3
8 tightens from the front and back. The outer ring 32a of the front bearing 32
Are pressed against the balls 32c,... At the front portion of the inner peripheral surface of the inner ring and at the rear portion of the inner peripheral surface of the inner
Further, the balls 33c,... Are pressed by the rear portion of the inner peripheral surface of the outer ring 33a of the rear bearing 33 and the front portion of the inner peripheral surface of the inner ring 33b of the rear bearing 33 so as to be difficult to turn, and the outer rings 32a of the front and rear bearings 32, 33 are prevented. , 33a to ball 32c,
.., 33c,.
The brake is applied to about g and the brake is applied to the clutch output shaft 29. The locking arm 39 extends from one of the front and rear pressing bodies 35 and 36, and is inserted and locked into, for example, the recess 23a of the transmission case 23 to prevent rotation. When the main clutch device 22 is configured as a dry multi-plate clutch, the main clutch device 22 rotates due to friction when the clutch is turned off. Therefore, add a brake to prevent sneaking,
It is necessary to prevent fluctuations in engine pulsation. In this embodiment, when the main clutch device 22 is disengaged from the clutch by turning off the main clutch device 22 as described above, the outer races 32a, 33a of the front and rear bearings 32, 33 move from the balls 32c,
The brake is applied to the inner races 32b, 33b via 33c, and the rotation of the clutch take-out shaft 29 can be prevented. Accordingly, it is possible to make the shift when the main clutch is OFF smooth, and to reduce uneven rotation due to pulsation when the engine is idling. Next, the structure of exhausting the cooling air in the hood 9 will be described with reference to FIG. A cooling fan 40 is provided at a rear portion of the engine 3, and an exhaust pipe 41 extending from a front portion of the engine 3 is connected to a muffler 42, for example, by bending it to the left side, and backward from an exhaust pipe 43 at a rear portion of the muffler 42. It is configured to exhaust toward. A wind guide plate 44 is provided on the front side of the exhaust pipe 41,
The wind from the cooling fan 40 is guided to the left, and the hood 9
The air is exhausted from the left side of the. However, even if combustion occurs due to afterburning in the exhaust pipe 41, cooling can be performed by the cooling air guided by the baffle plate 44.
Insulated with headlights 45, 4 in front of hood 9
5 can be prevented, and the durability of the headlight can be increased. Next, another embodiment of the PTO shaft will be described with reference to FIG. The power for the working machine branched by the counter gear case 17 is transmitted to the first PT at the rear of the machine via the transmission shaft.
The first PTO shaft 46 is transmitted to the O-shaft 46, and is always rotated while the engine 3 is rotating. This first PTO
The shaft 46 is configured as a double shaft composed of a rear PTO shaft 46b inserted and supported on the same axis so as to freely rotate with respect to the front PTO shaft 46a, and a concave portion 47 is formed at a rear end of the front PTO shaft 46a.
A cam 48 is provided at the front end of the rear PTO shaft 46b, and a first spring 49 is interposed therebetween to urge the cam 48 and the concave portion 47 to separate from each other. Is moved forward against the first spring 49, the cam 48 fits into the concave portion 47 to be in a transmission state. Further, the working machine input shaft 50 on the working machine (not shown) side is formed as a double shaft, and the front input shaft 50b is spline-fitted to the rear input shaft 50a so as to be movable. A second spring 51 stronger than the first spring 49 is interposed to bias the front input shaft 50b to move forward. When the front input shaft 50b of the working machine input shaft 50 is spline-fitted to the rear PTO shaft 46b of the first PTO shaft 46, the second PTO shaft 46b
Is pushed forward, the concave portion 47 and the cam 48 are fitted to each other, and a power transmission state is established. When the work implement input shaft 50 is removed from the first PTO shaft 46, the rear PTO shaft 46b
As a result, the rear PTO shaft 46b becomes non-rotating, and safety when removing the work machine can be secured. Next, the lifting and lowering device of the working machine will be described with reference to FIGS. A working machine (not shown) is connected to the rear of the body via an upper link 52 and left and right lower links 53, 53 so as to be able to move up and down freely.
4. Lift rods 55, 55 and lower links 53, 53
, A work implement (not shown) is moved up and down, and power is transmitted to a work implement (not shown) from a second PTO shaft 28 provided at the rear of the rear traveling transmission case 7. The front ends of stabilizers 56, 56 which can be extended and retracted by turnbuckles are connected to the rear part of the machine body. The rear ends of the stabilizers 56 are sandwiched between upper and lower support pieces 57a and 57b from above and below, and are connected by connecting pins 58 and 58. The lower surface of the upper support piece 57a and the upper surface of the lower support piece 57b that come into contact with the stabilizers 56, 56 are gradually retreated obliquely as they shift from the intermediate portion in the front-rear direction when viewed from the side, so that the vertical interval increases. It has a curved surface R. Stabilizer 5 of lower link 53, 53
If there is a dimensional error in the supporting portions 6, 56, the stabilizer 5
A force in the rotation direction is applied to the rear end of 6, 56 by vibration,
The turnbuckle may rotate and change length. However, the upper and lower support pieces 57a, 57
By configuring the curved surface R as described above in b, it is possible to prevent the rotation of the turnbuckle where a force in the rotation direction is not applied to the mounting portions of the stabilizers 56, 56 to the lower links 53, 53, and solve the above-mentioned problem. be able to. Next, the lighting configuration of the brake lamps 59 provided at the rear of the vehicle body will be described with reference to FIG.
The brake lamp circuit 60 is provided with a first relay 61, a second relay 62, and a brake lamp 59.
The switching circuit connected to 4 is provided with a mode switch 63 provided near the driver's seat, and switches the mode switch 63 between the traveling mode and the work mode.
Also, when you depress the left and right brake pedals 66, 66,
The brake switch 67 turns on and the second relay 62 turns on
The brake lamp 59 is turned on. When the mode changeover switch 63 is switched to the work mode, the relay 65 is turned on and the first relay 61 is turned off, and the brake lamp 59 is not turned on. The relay 61 is turned on, and the brake lamp 59 is turned on. Thus, when the mode changeover switch 63 is switched to the work mode, the brake lamp 59 does not turn on, so that unnecessary turning on of the lamp during tilling work or the like can be prevented, and the durability of the brake lamp 59 can be increased. Further, as shown in FIG. 11, the left and right brake pedals 66,
66 is configured to be switchable between an integrated operation state and an independent operation state by a coupling tool (not shown), and the left and right brake pedals 6 are provided.
When the connecting members 6 and 66 are connected to each other by a connecting tool to be in an integrated operation state, the brake pedal connection switch 68 is turned on, the first relay 61 is turned on via the relay 65 to turn on the brake lamp 59, and the brake connection is performed. When the monitor lamp 69 is turned on and the left and right brake pedals 66, 66 are independently operated by the connecting tool, the brake lamp 5
9 may be configured to be in a non-lighting state.

[Brief description of the drawings] FIG. 1 is an overall side view. FIG. 2 is a plan view partially omitted. FIG. 3 is a plan view of a main part. FIG. 4 is a cutaway side view and a front view of a main part. FIG. 5 is a side view and a plan view of a main part. FIG. 6 is a cutaway side view of a main part. FIG. 7 is a plan view of a main part. FIG. 8 is a plan view and a cut side view of a main part. FIG. 9 is a side view of a main part. FIG. 10 is an electric circuit diagram. FIG. 11 is an electric circuit diagram. [Explanation of symbols] 1 tractor 3 Engine 22 Main clutch device 23 Mission Case 29 Clutch take-out shaft 30 Mission input shaft 31 Connection tube 32 Front bearing 32a Outer ring 32b inner ring 32c ball 33 rear bearing 33a Outer ring 33b inner ring 33c ball 35 front pressing body 36 Back pressing body

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Claims (1)

Claims: 1. A tractor for transmitting power of an engine 3 to a transmission case 23 via a dry-type multi-plate main clutch device 22 in a tractor. The clutch take-out shaft 29 and the transmission input shaft 30 are connected so as to rotate integrally with each other by a connecting cylinder 31 by protruding the transmission input shaft 30 of the case 23 so as to coincide with the center of the shaft.
The rear bearings 32, 33 are fitted together, and the outer races 32a, 33a of the front / rear bearings 32, 33 are pressed from the front-rear direction to thereby form balls 32c of the front / rear bearings 32, 33.
.., 33c,..., And the outer rings 32a, 33a of the front and rear bearings 32, 33 are supported so as not to rotate.