JPH072288Y2 - Shaft connection cover structure for wheel drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a shaft connecting portion cover structure of a wheel driving portion of a traveling vehicle such as a tractor.

(Prior Art) For example, in a four-wheel drive tractor, the power extracted from a transmission case through a lower power extraction part is transmitted to an input shaft of a front wheel differential device via a propulsion shaft that penetrates an oil pan under the engine. Is configured to communicate.

The input shaft and the propulsion shaft are interlockingly connected by a tubular coupling between the rear support body that pivotally supports the rear center shaft portion of the front axle case and the oil pan. And are surrounded by a tube cover.

(Problems to be Solved by the Invention) The cylinder cover is located between the rear support and the oil pan, and is fixed to either one by bolts. The cylinder cover must be removed unless the oil pan or the rear support is removed. Can not be removed,
Therefore, the coupling has a structure that cannot be attached and detached, and disassembling and assembling the front axle case, the front wheel differential device, the propulsion shaft, and the like is very troublesome.

SUMMARY OF THE INVENTION The present invention provides a wheel drive system capable of solving the above-mentioned problems of the prior art by holding the coupling in the axial connection position with a pin and allowing the tubular cover to be housed in either the rear support or the oil pan. It is an object of the present invention to provide a shaft connecting portion cover structure of a portion.

(Means for Solving the Problem) A specific configuration for solving the problem in the present invention is as follows. A pair of front and rear supports 12 is attached to the axle frame 6 fixed to the front part of the engine 2.
Fix the F and 12R, and attach the front and rear supports 12F and 12R to the axle case 13
The front and rear center shaft parts 14F and 14R are pivotally supported, and the input shaft 18 of the differential device 15 built in the axle case 13 is exposed rearward from the center shaft part 14R on the engine 2 side and the support body 12R, and the oil on the lower part of the engine 2 is exposed. An end portion of the propulsion shaft 21 that penetrates the pan 26 in the front-rear direction is connected to an end portion of the input shaft 18 by a coupling 29 that is slidable in the axial direction, and a tubular cover 31 that surrounds the coupling 29 serves as a support body 12R. In the shaft connecting portion cover structure of the wheel driving portion provided between the oil pan 26 and the oil pan 26, the coupling 29 is provided with the pin 30 for holding the shaft connecting position, and the support 12R and the oil pan 2 are provided.
A housing portion 33 for slidingly housing the tubular cover 31 in the axial direction is formed in either one of 6 and 6, and an end portion 31a of the tubular cover 31 protruding from the housing portion 33 is joined to the other fitting portion. A part 35 is formed, and a retaining ring 38 that prevents sliding toward the storage part 33 in a state of being coupled to the fitting part 35 is fitted to the tube cover 31.

(Operation) The cylinder cover 31 provided between the rear support 12R and the oil pan 26 connects the input shaft 18 and the propulsion shaft 21 when the snap ring 38 is removed and the cylinder cover 31 is housed in the oil pan 26. Coupling
29 is exposed, pull out the pin 30 and push the coupling 29
When sliding to the side, the connection between the input shaft 18 and the propulsion shaft 21 is released.

In the case of shaft coupling, the coupling 29 is slid to fit the input shaft 18, the pin 30 is inserted, the tube cover 31 is pulled out from the storage portion 33, and the end portion 31a thereof is attached to the rear support 12R. After fitting, the snap ring 38 is fitted into the circumferential groove 37 to prevent the cylinder cover 31 from sliding.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 4 shows the entire agricultural tractor 1. The tractor 1 directly connects the engine 2, the clutch housing 3 and the transmission case 4 to form the vehicle body 5, and the front axle frame 6 is fixed to the front part of the engine 2. ing.

This tractor 1 is a two-axis four-wheel drive type, and a rear wheel 7 is driven by a rear axle 7 arranged on the rear side of the mission case 4, and a front wheel 10 is driven via a power take-out section 9 provided at the lower part of the mission case 4. The engine power can be transmitted to.

1 to 4, a pair of front and rear supports 12F, 12R are fixed to the lower portion of the front axle frame 6, and the front and rear supports 12F, 12R are fixed.
The front axle case 13 is supported by 2R.

The front axle case 13 rotatably supports the front wheels 10 on both left and right ends, and front and rear center shaft portions 14F and 14R rotatably supported by front and rear support members 12F and 12R are formed in the center of the front axle case 13. A front wheel differential device 15 is built inside.

The front wheel differential device 15 has an input shaft 18 integrated with a bevel pinion 17,
The input shaft 18 has an output shaft 20 having a bevel gear 19 and the like, and the input shaft 18 penetrates the rear center shaft portion 14R and the rear support 12R to be exposed to the rear, and a propulsion shaft 21 extended forward from the power take-out portion 9. It is connected.

Specifically, the front axle case 13 has a bearing case 22 and a bearing cover 23 in the center rear part, and a power cylinder 27 for steering is arranged in the bearing case 22 and the bearing cover 23.
A rear center shaft portion 14R is formed therein and is supported by the rear support 12R via a bush 24.

The propulsion shaft 21 is protected by a shaft cover 25 and penetrates an oil pan 26 below the engine 2 in the front-rear direction, and a front portion thereof is exposed forward from the oil pan 26.

Shaft splines are formed in the rear portion of the input shaft 18 and in the front portion of the propulsion shaft 21, respectively, and a tubular coupling 29 having a hole spline is fitted and interlocked with each other.
Is axially slidable on one shaft (propulsion shaft 21) side, and can be disconnected from the other shaft (input shaft 18) by sliding. This coupling 29 is a radial pin
30 penetrates and holds the position where the two shafts 18 and 21 are connected.

Reference numeral 31 denotes a sleeve-shaped tubular cover that surrounds the coupling 29, and is axially slidably supported by a cover support 32 attached to the oil pan 26. The cover support 32 includes the tubular cover 31. A storage portion 33 for storing is formed.

The cover support 32 is inserted and mounted in the oil pan 26 from the front, and the rear end supports the shaft cover 25.
A seal ring 34 is provided to seal between the seal ring 34 and the seal 31.

The cylindrical cover 31 has a shape in which the front end portion 31a can be fitted with a spigot, can be fitted with the fitting portion 35 at the rear end of the rear support 12R, and when fitted with the fitting portion 35, The position in the front direction is defined, and the seal ring 36 also seals.

In addition, a peripheral groove 37 is formed on the outer peripheral surface of the cylindrical cover 31, which is aligned with the front surface of the oil pan 26, that is, the front surface of the cover support 32 in a state of being substantially fitted to the fitting portion 35. A retaining ring 38 is fitted on 37 to prevent sliding in the rearward direction.

The snap ring 38 may be a snap ring, but an undeformed one as shown in FIG. 3 is used here. The retaining ring 38 has a hole 39 in the ring portion 38a, which has a diameter slightly larger than the outer circumference of the cylindrical cover 31, and a bolt 40 is formed in the portion protruding from the ring portion 38a.
An elongated hole 41 that penetrates through is formed. The bolt 40 is screwed into the cover support 32, the long hole 41 is long in the radial direction of the hole 39, and the retaining ring 38 corresponding to the circumferential groove 37 is moved to make the ring portion 38a engageable with the circumferential groove 37. There is. The retaining ring 38 may be swung around the bolt 40 so that the wheel portion 38a is engaged with the circumferential groove 37. In that case, the bolt hole does not have to be a long hole.

When disassembling the shafts 18 and 21 from the state shown in FIG. 2, when the bolt 40 is loosened and the retaining ring 38 is moved along the elongated hole 41, the hole 39 of the retaining ring 38 becomes concentric with the tube cover 31. The cylinder cover 31 is released from the rearward movement prevention and can be stored in the storage portion 33. When the cylinder cover 31 slides backward, the coupling 29 is exposed,
Pin 30 can be pulled out. When the coupling 29 is slid rearward after pulling out the pin 30, the fitting with the input shaft 18 is released, and the rear support 12R and the front axle case 13 can be disassembled.

The present invention is not limited to the above embodiment, but can be modified in various ways. For example, engine 2 and wheels
10 may be arranged at the rear of the tractor 1, and the cylinder cover 31
It is also possible to form the storage portion 33 for the inside of the rear support 12R (including the inside of the rear center shaft portion 14R) and attach the snap ring 38 to the rear support 12R. Or propulsion shaft 21
Or the snap ring 38 may have a C-shape in which the shaft portion 38a has only a semicircle.

(Effects of the Invention) According to the present invention described in detail above, the coupling 29 is provided with the pin 30 for holding it at the shaft connecting position, and the support 12R and the oil pan 2 are provided.
A housing portion 33 for housing the tubular cover 31 by sliding in the axial direction is formed on either one of the 6 and 6, and an end portion 31a of the tubular cover 31 protruding from the housing portion 33 is joined to the other fitting portion. Since the portion 35 is formed and the tubular cover 31 is fitted with the retaining ring 38 that prevents sliding toward the storage portion 33 side in a state of being coupled to the fitting portion 35, the tubular cover 31 has the end portion 31a. By coupling and fitting the retaining ring 38, it can be fixed between the support 12R and the oil pan 26 and can be slid into the storage part 33, and thus the oil Since the cylinder cover 31 can be fitted and removed without removing the pan 26 and the support body 12R, the pin 30
It is also possible to easily insert and remove, and to attach and detach the coupling 29, and it is possible to easily disassemble and assemble the axle case 13, the propulsion shaft 21, and the like.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a sectional side view, FIG. 2 is an enlarged sectional view of an essential part, and FIG. 3 is III of FIG.
-III sectional drawing and FIG. 4 are side views of the whole tractor. 2 ... tractor, 6 ... front axle frame, 9 ... power take-off part, 12R ... rear support, 13 ... front axle case, 14R ...
Rear center shaft, 15 …… Front wheel differential device, 18 …… Input shaft, 21
…… Propulsion shaft, 26 …… Oil pan, 29 …… Coupling,
30 …… Pin, 31 …… Cylinder cover, 31a …… Front end, 32 ……
Cover support, 33 …… storing part, 35 …… fitting part, 37 …… circumferential groove, 38 …… stop ring.

Claims (1)

[Scope of utility model registration request] 1. A pair of front and rear supports (12F) (12R) are fixed to an axle frame (6) fixed to the front part of the engine (2), and the front and rear supports (12F) (12R) are attached to the axle case ( Axle case (13) that pivotally supports the front and rear center shaft parts (14F) (14R) of (13).
The input shaft (18) of the differential device (15) built into the engine is exposed rearward from the center shaft portion (14R) on the engine (2) side and the support body (12R), and the oil pan (26) under the engine (2) is exposed. The end of the propulsion shaft (21) that penetrates the front and back is connected to the input shaft (18).
A cylinder cover (31) that is connected to the end of the coupling by an axially slidable coupling (29) and surrounds this coupling (29).
In the shaft connecting portion cover structure of the wheel drive portion provided between the support body (12R) and the oil pan (26), the coupling (29) is provided with a pin (30) for holding the shaft connecting position, One of the body (12R) and the oil pan (26) is formed with a storage part (33) for slidingly storing the tubular cover (31) in the axial direction, and the other part is provided with a storage part (33).
A fitting portion (35) is formed to which the end portion (31a) of the tubular cover (31) protruding from the fitting portion is formed, and the tubular cover (31) is accommodated in the storage portion (33) while being fitted to the fitting portion (35). ) Is fitted with a retaining ring (38) for preventing sliding to the shaft side.