JPS6027091Y2 - Kingpin support device for agricultural tractors, etc. - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a support device for a king pin in a front axle portion of an agricultural tractor or the like.

Conventionally, this type of king pin support device has a wheel axle 2 attached to the lower end of a king pin 1, and a cylindrical king pin support 4 fixed to the tip of an axle extension 3 above the wheel axle 2, as shown in FIG. is fitted onto the kingpin 1, and the knuckle arm 5 is attached above it, and the upper side A thrust ball bearing 9 was interposed at the bottom side, an annular spacer 10 supporting an oil seal portion was interposed at the lower side, and an oil seal 11 was fitted on the outside of the spacer 10.

Note that 12 in the figure is a cylindrical front axle, and the axle extension 3 is inserted into and fixed to this front axle 12 so as to be freely removable.

Further, 1313 is a bush interposed between the king pin 1 and the support 4, 14 is a wheel hub fitted onto the wheel axle 2, 15 is a disk attached to the wheel hub 14, and 16 is a tire.

However, in such a configuration, expensive parts such as the ball part and the ring 9 are used, and since the spacer 10 receives the load from the kingpin support 4 side, the spacer 10 also needs to be made of a relatively expensive material. This has the disadvantage of increasing the overall cost.

In addition, in a different model, a thrust collar is used instead of a ball bearing, a protective ring is interposed between the thrust collar and the upper surface of the wheel axle, and the protective ring is cut into a cross-sectional shape so that the outer circumference of the thrust collar is There is one in which a ring seal is further interposed between the protective ring and the inner periphery of the king pin support (Utility Model Application No. 53-5933).

However, even in this case, since the protective ring receives the load from the kingpin support side, it is still necessary to use an expensive material like the spacer, which has the drawback of increasing costs.

The present invention aims to eliminate such drawbacks of the conventional example.

The structure of the present invention will be explained based on the drawings showing one embodiment. In FIG. A recess 23 is cut out.

Reference numeral 24 denotes a step formed on the outer peripheral surface of the recess 23, so that the recess 23 has a smaller diameter on the lower side and a larger diameter on the upper side.

A steel ball 2 is placed at the bottom of this annular recess 23.
5 is directly inserted over the entire circumference, and the king pin 21
The lower part of the king pin support 26, which is relatively rotatably fitted to the outside, is fitted into the recess 23, and
Its lower end abuts against the ball 25 and is directly supported by the ball 25.

27 is a bushing interposed between the kingpin support 26 and the kingpin 21.

28 is an O-ring interposed between the large diameter part of the recess 23 and the king pin support 26 above the ball 25, and two O-rings are provided in parallel in the axial direction.
This O-ring 28 allows the king pin support 2 to
6. The support part is sealed.

Reference numeral 29 denotes a ring that prevents the O-ring 28 from being removed, which is fitted onto the king pin support 26 on the outside of the O-ring 28.

Further, 30 indicates an axle extension as a front axle portion to which the king pin support 26 is attached;
1 is a bushing interposed between the kingpin support 26 and the kingpin 21.

In the above, in order to form the annular recess 23, instead of cutting the upper surface of the wheel axle 22 as in this embodiment, something like the bearing cover 6 in FIG. 1 is fixed to the upper surface of the wheel axle 22. Good too.

The present invention has the above-mentioned configuration, and thus the present invention forms a recess on the upper surface of the wheel shaft, directly supports the king pin support with the ball inserted into the recess, and
0 inserted between the king pin support and the inner circumferential surface of the recess.
It has a ring-sealed structure, and uses inexpensive balls directly instead of conventional ball bearings. Moreover, only these balls receive the load from the kingpin support side, as shown in Figure 1. Since such a space or a load supporting member such as the protective ring of JP-A No. 53-5933 is not required, even if the cover 29 is required as in this embodiment, such a cover is just a cover. Therefore, there is no need to use expensive materials, and the overall effect is that it can be manufactured at low cost.

In addition, in the present invention, the ball and O
This has the advantage of being easier to assemble by inserting the ring etc. from above, unlike the conventional method of inserting the ball bearing etc. into the underside of the bearing cover.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a king pin support part showing a conventional example, and FIG. 2 is a vertical cross-sectional view of a king pin support part showing the present embodiment. 21...King pin, 22...Wheel axle, 23...
Recess, 25...Ball, 26...King pin support, 28...0 ring, 30...Axle extension.

Claims (1)

[Scope of utility model registration request] The upper surface of the wheel shaft attached to the lower end of the kingpin is formed with an annular recess along the outer periphery of the kingpin, and a ball is fitted around the entire circumference of the recess, while the ball is fixed to the tip of the front axle,
The lower part of the kingpin support that is externally fitted onto the kingpin is fitted into the recess, and the kingpin insert is directly supported by the ball, and the outer periphery of the kingpin support and the inner periphery of the recess are configured to directly support the kingpin insert with the ball. Between,
A kingpin support device for an agricultural tractor or the like, characterized in that a sealing member for sealing the ball portion is provided.