JPH0625708Y2 - Power transmission structure of mobile agricultural machinery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a transmission structure of a mobile agricultural machine, and more particularly, to improvement of a connecting portion of a transmission shaft.

[Conventional technology]

As the above-mentioned transmission structure in the related art, for example, the actual Kai 56-1
As disclosed in Japanese Patent No. 4223, a transmission flange portion is formed on both the drive side shaft and the driven side shaft at a portion different from the ball joint mechanism, and an elastic body is provided between these flange portions. There was an intervening structure.

[Problems to be solved by the device]

The above structure has a function of reducing noise generated by gear collision of the mission case due to the non-uniform rotation of the engine during non-negative rotation, but the connecting structure is complicated and the external shape is large. There was a problem to be solved that it would turn into a problem.

An object of the present invention is to provide a compact structure and a simple structure capable of suppressing noise generation during low load operation, and to improve the sealing performance in the improved structure.

[Means for Solving the Problems]

A feature of the present invention is that a drive shaft on the engine side and a driven shaft on the mission case side are interlockingly connected via a ball joint mechanism, and a relative tiltable inner ring and an outer ring in the ball joint mechanism are connected. , The transmission steel ball and the transmission elastic body are engaged with each other, and the engagement holding portion of the steel ball is formed with a flexibility allowing relative rotation of the inner and outer rings in a certain small range in the circumferential direction. And a seal member that extends the inner ring outward from the opening end of the outer ring and closes the opening, is provided over the inner surface on the opening side of the outer ring and the outer surface of the extended portion of the inner ring. Points and their actions and effects are as follows.

[Action]

(A) With the above characteristic configuration, during no-load operation,
Since the drive shaft and the driven shaft are interlockingly connected only via the transmission elastic body, and the engagement connecting portion of the transmission steel ball is set to be relatively rotatable by the accommodation, the engine shaft is not rotated. The non-constant velocity component of the constant velocity rotation is absorbed by the elastic displacement of the elastic body, so that the driven shaft can rotate at the constant velocity as much as possible.

(B) With the above characteristic structure, the depth of the outer ring in the axial direction can be reduced to facilitate the assembly of the ball joint mechanism, and since the seal member is attached between the outer ring and the inner ring, The seal member can be attached in a shorter distance between the inner ring mounting side shaft and the case where the spline part of the shaft is avoided and attached.

[Effect of device]

Therefore, due to the above action (a), it is possible to reduce the transmission noise at no load by simply improving the ball joint mechanism without using a large-diameter flange shaft joint, etc. It has become possible to achieve miniaturization of. Moreover, due to the above-mentioned action (b), the distance between the outer peripheral side and the inner side of the seal member in the axial direction becomes small, and the seal member is hard to separate from the shaft surface due to the relative tilting of each shaft. The problem that the lubricating oil in the mechanism leaks can be prevented in advance. Further, since the inner ring is lengthened, there is an effect that the wear resistance between the inner ring and its mounting shaft is improved.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 5 shows an agricultural tractor which is an example of a mobile agricultural machine according to the present invention. This tractor has an engine at the front of the fuselage.
In addition to mounting (1), a mission case (2) is arranged in the rear part, and the engine (1) and the mission case (2) are interlockingly connected via a ball joint mechanism (A) described later, and the mission case ( The power of 2) is transmitted to the rear wheel (3) so that the vehicle can be driven to travel.

Next, the transmission structure between the engine (1) and the mission case (2) will be described.

As shown in Fig. 1, anti-vibration rubber (9) is mounted on the machine frame (8).
The output shaft (11), which is the drive shaft on the engine (1) side extending to the rear of the engine (1) mounted via the engine, and the connecting shaft (12), which is the driven shaft on the mission case (2) side. And are linked together via a ball joint mechanism (A), and the rear end of the connecting shaft (12) and the input shaft (13) of the mission case (2) have the same structure as the ball joint mechanism (A). It is interlockingly connected through the mechanism (A).

A wet multi-plate type main clutch (10) is provided at the entrance of the mission case (2). This main clutch (10) is the 4th
As shown in the figure, the driven shaft (14) is loosely fitted onto the input shaft (13) and externally rotated with the input shaft (13).
A multi-plate friction transmission mechanism (5) is provided between (4) and the outer peripheral portion of the driven shaft (14). Then, the multi-plate friction type transmission mechanism (5) is configured to press and urge the compression spring (6) so as to be in a transmission state, and the driven shaft (1
Formed on the sliding member (26) that engages and holds the friction plate (25) group on the 4) side is an engaging piece (27) that engages with the friction plate (25a) closest to the spring (16). On the side opposite to the spring (6), there is provided a pressing member (28) that shifts with the hydraulic oil supplied via the oil passage (l). Then, by supplying hydraulic oil through the oil passage (l), the pressing member (28) shifts to the friction plate (25) side, presses the sliding member (26), and each friction plate (25 It is configured so that the friction transmission state of () can be released and the clutch disengagement state can be set.

Next, the structure of the ball joint mechanism (A) will be described. That is, the proximal end boss portion (15a) of the connecting outer ring (15) of the ball joint mechanism (A) is spline fitted onto the rear portion of the output shaft (11), and the proximal end boss portion (15a) is radially attached. A through hole (16) is formed along with, and a groove (17) is provided on the outer peripheral surface of the output shaft (11) corresponding to this through hole (16), and both (16) and (1
Snap the sphere (18) over and the snap ring (19)
To prevent the outer ring (15) from moving in the axial direction. Then, the connecting inner ring (20) of the ball joint mechanism (A) is spline-out fitted to the front part of the connecting shaft (12), and is fitted into the extended case part (15b) of the outer ring (15), A transmission elastic body (21) and a transmission steel ball (22) across the outer periphery of the inner ring (20) and the inner periphery of the extended case portion (15b).
Are engaged. As shown in FIG. 3, two of the four recesses (23) formed on the outer circumference of the inner ring (20) at predetermined intervals are opposed to each other and the corresponding outer ring (15) is formed on the inner circumference. The elastic bodies (21) made of rubber having a cylindrical shape are closely engaged with each other over the formed recesses (24), and the circumferential direction intermediate portions of the elastic bodies (21) are similarly 4 Steel balls (22)
By engaging the outer ring (15) and the inner ring (20), that is, the output shaft
The (11) and the connecting shaft (12) are linked together.

And the engagement holding portion of the steel ball (22), the inner and outer rings (15), (20)
There is formed an accommodation (S) that allows a relative small range of relative rotation in the circumferential direction. That is, the steel ball (22) is used as the engaging recess of the inner ring (20).
The engaging recess (24) of the outer ring (15) is closely fitted in the (23) and has a gap along the circumferential direction to form the interchange (S).

As shown in FIG. 2, the ball joint mechanism (A) having the above-described structure can relatively tilt the output shaft (11) and the connecting shaft (12), and at the same time can absorb the vertical vibration of the engine (1). When the mission case (2) side is unloaded (neutral state), power is transmitted to the output shaft (11) and the connecting shaft (12) only by the elastic body (21). When the load is applied, the elastic body (21) elastically deforms, the steel ball (22) and the outer ring (15) contact each other, and reliable power transmission is performed via the steel ball (22).

The ball joint mechanism (A) on the rear side has the same structure as the ball joint mechanism (A) on the front side and is arranged in the front-rear direction. Then, in the ball joint mechanism (A) on the front side, the inner ring (20) external fitting spline processing portion of the connecting shaft (12) is formed long toward the rear, and when each joint mechanism (A) is assembled, The inner ring (20) can be retracted rearward. In addition, a cylindrical rubber (29) for preventing adhesion of mud or the like is externally fitted to the extension spline shaft portion.

And, while extending the front inner ring (20) to the outside of the opening (30) end of the outer ring (15), a seal member (31) for closing the opening (30) is attached to the outer ring (15). The inner surface on the opening side and the outer surface of the extension portion (20a) of the inner ring (20) are fixed to each other.

With such a configuration, even when tilted as shown in FIG. 2, for example, the seal member (31) avoids the arc-shaped cutting portion of the spline machining of the connecting shaft (12),
Compared with the one provided between the outer ring (15) and the connecting shaft (12), the sealing member (31) can be made shorter and the sealing performance is improved.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of the transmission structure of a mobile agricultural machine according to the present invention. Fig. 1 is a vertical sectional side view of a main part, Fig. 2 is a vertical sectional side view of the main part in a tilted state, and Fig. 3 is a vertical front view of the main part. 4 and 5 are sectional views of the main clutch, and FIG. 5 is an overall side view of the agricultural tractor. (1) …… Engine, (2) …… Mission Case, (12) ……
Driven shaft, (15) …… outer ring, (20) …… inner ring, (20a) …… extension part, (21) …… elastic body, (22) …… steel ball, (30) …… opening, ( 3
1) …… Seal member, (A) …… Ball joint mechanism.

Claims (1)

[Scope of utility model registration request] 1. A ball joint mechanism comprising a drive shaft (11) on the engine (1) side and a driven shaft (12) on the mission case (2) side.
The ball joint mechanism (A) has an inner ring (20) and an outer ring (1) that can be tilted relative to each other while being interlockingly connected via (A).
5) Between the steel ball for transmission (22) and the elastic body for transmission (21)
And the engagement holding portion of the steel ball (22) is formed with a flexibility (S) that allows a relative small range of relative rotation of the inner and outer rings (15) and (20) in the circumferential direction. And the inner ring (20) is connected to the outer ring (1
A seal member (31) that extends outward from the end of the opening (30) of (5) and closes the opening (30) is provided on the inner surface of the outer ring (15) on the opening side and the extending portion of the inner ring (20). (20a) A transmission structure for a mobile agricultural machine attached to the outer surface.