JPS5812815A - Front axle supporting structure - Google Patents

Abstract

PURPOSE:To permit adjustment of the play due to friction by forming the inlet of the bearing hole on an axle bracket into a stepped hole and installing a thrust collar, which is pushed onto the bottom part of the stepped hole by the retainer ring which is screwd onto a supporting shaft so that its longitudinal position can be adjusted. CONSTITUTION:The inlet side of the bearing hole 2a on the bearing body 2 for an axle bracket is formed into the stepped hole consisting of the widened part 2b and the smaller port part 2c, and a thrust collar 7 is fitted in contact with the bottom surface of the widened part 2b. A screw 5b is provided on the outer peripheral area closer to the root part side than the small diameter part 5a of a supporting shaft 5, and a retainer ring 8 is screwed towards the small diameter part 5a side. Therefore, when the supporting shaft 5 is fitted into the bearing hole 2a, the thrust collar 7 is set between the bottom 2d of the widened part and ring. With such a constitution, when a play is generated in the supporting part because of the friction of the thrust collar 7, the retainer ring 8 is screwed forward to absorb the play.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support structure for a front axle of a vehicle.

In vehicles such as tractors, the front axle is generally supported so that it can swing up and down by fitting front and rear support shafts protruding from the center into bearing holes in the bearing body. be. In the conventional front axle support structure, in order to eliminate play in the axial direction of the support shaft, as shown in FIG.
A ring-shaped thrust collar 7 was disposed between the ring-shaped thrust collar 7 and the bottom surface of the enlarged opening 2b provided on the entrance side of the bearing hole 2a, but this thrust force? -7 often wore rapidly during use, resulting in harmful play in the bearings. When such play occurred, the worn thrust collar had to be replaced each time, but this replacement required a great deal of effort.

The present invention provides a front axle support structure that can compensate for the wear with a simple operation and prevent play in the support even if the thrust collar is worn due to use. , which will be explained below.

In the front axle support structure according to the present invention, when the front and rear support shafts protruding from the center of the front axle are fitted into and supported by the bearing holes provided in the axle bracket that supports the front axle, the front axle supports the front axle. is formed as a stepped hole with an enlarged opening on the inlet side, and a ring-shaped thrust collar that fits on the support shaft is disposed in this enlarged opening, and a screw is provided on the outer periphery of the intermediate part of the support shaft. A presser ring with a screw whose longitudinal position can be adjusted is screwed onto this, and with the support shaft fitted into the bearing hole, the thrust collar is clamped between the bottom surface of the enlarged part of the bearing hole and the end surface of the presser ring. It is characterized by the fact that it is made to do so. The embodiments shown in the drawings will be specifically described below.

Fig. 1 is a schematic diagram of a tractor according to the present invention, and Fig. 2 is an enlarged view of a front axle support part. A front bearing body 2 is provided at the front of the axle bracket 1, and a rear bearing body 2' is provided at the rear thereof. The front axle 3 has a front support shaft 5 and a rear support shaft 5' protruding from both the front and rear sides of the center thereof, which are fitted into the bearing holes 2a, 2a' of the front bearing body 2 and rear bearing body 2'. By doing so, the support shaft 5゜5
It is supported so that it can freely rotate up and down with the center of rotation at '.

In the illustrated example, the front bearing body 2 is manufactured separately from the axle bracket 1 body, and is attached to the front part of the axle bracket 1 body in a suspended state with its bearing hole 2a opening toward the rear. There is. This front bearing body 2 covers the front of the support shaft and also serves to protect it.

The bearing holes 2a and 2a' are formed as stepped holes with enlarged openings 2b and 2b' having a large inner diameter on the inlet side and small openings 2C and 2C' with a small diameter on the back side, respectively. Small diameter portions 5a and 5a' forming the tips of support shafts 5 and 5' are fitted into 2C and 2cl via bushings 6, respectively. The roots of the small diameter portions 5a, 5a' reach the widened portions 2b, 2b', and a slat collar 7 that contacts the bottom surfaces 2d, 2d/ of the widened portions is fitted into these portions. . The small diameter portions 5a, 5 of the support shafts 5, 5'
A threaded portion 5b, 5b' having a thread cut on the outer periphery is provided at a portion closer to the base than a', and this threaded portion 5.
b, , 5 b' and the small diameter portions 5a, 5a',
The medium diameter portion 5c is slightly thicker than the small diameter portion.

5 c/ is provided. The threaded portions 5b and 5b' of the support shafts 5 and 5' have a tip end portion that is connected to the medium diameter portion 5c5.
The threaded presser ring 8, which is formed as a fitting ring 8a that fits into c/ and whose root side is formed as a threaded ring 8b, is arranged so that its outer end surface 8c comes into contact with the L thrust collar 7. It is screwed on. Thereby, the thrust collar 7 can be moved back and forth along the bottom surfaces 2d and 2d' of the enlarged opening and the end surface 8c of the presser ring 8. In addition, a bearing hole (enlarged part 2
ty, 2b〆) is disposed, and a locking nut 1-10 for fixing the position of the presser ring 8 is screwed inside the presser ring 8. In addition,
The fitting between the fitting ring 8a and the medium diameter portions 5C, 5C' of the support shaft serves to prevent play of the support shaft in the direction perpendicular to the shaft.

Since the front axle support structure according to the present invention is configured as described above, when the thrust collar is worn out due to use, the retainer ring is moved to the thrust collar side by that amount to compensate for the wear and cause harmful It is possible to prevent the occurrence of play in the axial direction. Since the holding ring can be easily moved by simply turning the holding ring, it is much more convenient to handle than a structure in which a worn thrust ring must be replaced each time.

FIG. 2 is an enlarged sectional view of the main part, and FIG. 3 is a sectional view of the conventional support structure.

1 Axle bracket, 2, 2'...bearing body, 2a
.

2 a/...Bearing hole, 2b, 2b' enlarged part, 3...
Front axle, 5, 5'・Support shaft, 6... Bushing, 7 Thrust collar, 8... Holding ring, 10
1. Rocknut.

Patent applicant: Iseki Agricultural Machinery Co., Ltd. Agent: Patent Attorney Hiroshi Sugahara

Claims (3)

[Claims] (1) When supporting the front and rear support shafts protruding from the center of the front axle by fitting them into the bearing holes provided in the axle bracket that supports the front axle, the entrance side of the bearing holes should be an enlarged part. A ring-shaped thrust collar that fits on the support shaft is installed in this enlarged opening, and a screw is provided on the outer periphery of the middle part of the support shaft, and a screw that can adjust the front and back position is installed on the outer circumference of the intermediate part of the support shaft. The thrust collar is sandwiched between the bottom surface of the enlarged part of the bearing hole and the end surface of the presser ring in a state in which a presser ring is screwed on and the support shaft is fitted into the bearing hole. Front axle support structure. (2) The front axle support structure according to claim 1, wherein a lock nut for fixing the presser ring is provided inside the presser ring. (3) Claim 1 or 2, wherein the front support shaft of the front axle is supported by a rearward-opening bearing hole of a bearing provided hanging from the front part of the axle bracket body. front axle support structure.