JPH0125748Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a kingpin sealing structure in a support structure in which a wheel shaft is connected to an axle via a kingpin.

[Prior art]

There is a kingpin system as a support mechanism that supports a wheel shaft in a steerable manner relative to an axle. In this kingpin method, one shaft end is a bifurcated shaft support, the other shaft end is constructed as a shaft support interposed between the bifurcated shaft supports, and the kingpin is passed through both shaft supports for connection. It is. The system in which the bifurcated shaft support is provided on the axle side is called the Elliott type kingpin system, and the system in which it is provided on the wheel shaft side is called the reverse Elliott type kingpin system.

However, especially in vehicles such as golf cars that run on unpaved roads, dust such as sand tends to enter between the king pin and the upper side of the bifurcated shaft, especially from the upper side of the upper side of the bifurcated shaft. This results in increased wear on the king pin in the portion corresponding to the shaft support. However, when the wear of the king pin becomes large as described above, there is a problem in that the play in the steering system becomes large and the steering performance becomes unstable.

[Purpose of invention]

The purpose of this invention is to reduce the wear on the kingpin and the surrounding shaft support by devising the bushing, and also to make the bushing easy to attach and detach, to ensure that it will not fall off after mounting, and to be lightweight. The objective is to provide a seal structure for the king pin that enables

[Structure of the idea]

In order to achieve the above object, the present invention has one shaft end as a bifurcated shaft support, the other shaft end as a shaft support interposed between the bifurcated shaft supports, and both shaft supports are connected to a king pin. In the wheel shaft support structure connected through the bifurcated shaft support, a resin bushing is provided in the king pin fitting hole of the upper side shaft support of the bifurcated shaft support, and the bushing is protruded upwardly from the upper surface of the upper side shaft support. a cap portion that encloses the upper end of the kingpin; a cylindrical portion that surrounds the portion of the kingpin that is fitted into the fitting hole; and a flange portion that is interposed between the lower surface of the upper shaft support and the upper surface of the shaft support of the other shaft end. It is characterized in that the cap part, the cylindrical part, and the collar part are integrally molded.

[Example of idea]

The present invention will be explained below with reference to embodiments shown in the drawings.

In the figure, 1 is an axle, and 2 is a wheel axle. The wheel shaft 2 supports a wheel 4 via a bearing 3. At the end of the axle 1, there are two upper and lower shaft supports 1.
a, 1b are provided in a bifurcated shape, and a shaft support 2a provided at the end of the wheel axle 2 is assembled so as to be interposed between the bifurcated shaft supports 1a, 1b. The shaft supports 1a, 2a at both shaft ends assembled in this way,
A king pin 5 passes through 1b and connects them to each other.

Resin bushes 6 and 7 impregnated with oil are provided in the fitting holes into which the king pins 5 of the bifurcated shaft supports 1a and 1b are inserted, respectively. Further, washers 8 and 9 are interposed between the inner surfaces of the pivot supports 1a and 1b and both end surfaces of the pivot support 2a, respectively.

The bush 6 provided on the upper shaft support 1a is integrally molded from impregnated resin so as to have three parts: a cap part 6a, a cylindrical part 6b, and a flange part 6c. Of these three parts, the cap part 6a is formed to protrude upward from the upper surface of the upper side shaft support 1a and wrap around the upper end of the king pin 5, and the cylindrical part 6b
is formed so as to surround the portion where the king pin 5 fits into the fitting hole of the upper side shaft support 1a, and the collar portion 6c is sandwiched between the lower surface of the upper side shaft support 1a and the washer 8 on the upper surface of the upper side shaft support 2a. It is designed so that it can be This bushing 6 protects the kingpin 5, especially from dust that tries to enter from above. In addition, the bush 7 provided on the lower side shaft support 1b
is also integrally molded from oil-impregnated resin so as to have a cylindrical portion 7b surrounding the portion of the king pin 5 pivotally supported by the shaft support 1b, and a flange portion 7c facing the washer 9.

In addition, skirt-like boots 10 and 11 made of resin are provided on the periphery of the washer 8 and the flange 6c, and on the periphery of the washer 9 and the flange 7c, respectively.
These gaps are sealed to prevent dust from entering. Furthermore, a skirt-like boot 12 made of resin is provided on the lower surface side of the lower shaft support 1b,
The gap formed by the bushing 7 is sealed to prevent dust from entering.

According to the seal structure of the king pin described above, of the bifurcated shaft supports 1a and 1b, the cap portion 6 is attached to the upper shaft support 1a where dust is most likely to enter.
a bush 6 is provided, and the king pin 5
In addition to wrapping the upper end, the cylindrical portion 6b of the bush 6 also wraps the portion corresponding to the shaft support.
Dust such as sand does not enter around the king pin 5. Therefore, not only the wear of the king pin 5 is reduced, but also the wear between the lower surface of the upper side shaft support 1a and the upper surface of the middle shaft support 2a is reduced, and play is prevented from occurring early, making it possible to stabilize the steering system. can.

Furthermore, if skirt-like boots 10, 11, and 12 are further provided as in the above embodiment,
Dust that tries to enter the middle of the shaft support or from the lower end is also prevented, and wear prevention of the king pin 5 and its surrounding shaft support is further completed.

Moreover, the bush 6 has a cap part 6a and a cylindrical part 6.
b are integral, and the flange 6c is integrally formed, so when installing, insert the cap 6a from the bottom side into the fitting hole of the upper side shaft support 1a, and the flange 6c is connected to the upper side shaft support 1a. The cylindrical portion 6b can be reliably set in a predetermined position by simply pushing the cylindrical portion 6b until it comes into contact with the lower surface of the cylindrical portion 1a, so that assembly is very easy. Also, after installing Butsuyu 6,
Since the flange portion 6c acts as a stopper, there is no risk of it falling off from the king pin 5.
In addition, when removing the bush 6 for parts replacement etc., after pushing the cap part 6a which protrudes upward from the upper surface of the upper side shaft support 1a downward, the flange part 6c
It can be easily removed by grabbing it and pulling it out.

Further, since the bush 6 has a shape in which the cap 6a protrudes upward from the upper surface of the upper side shaft support 1a, the king pin 5 can be supported pivotally on the entire inner circumference of the fitting hole of the upper side shaft support 1a. It becomes like this. Therefore, with this, the upper side shaft support 1a
The wall thickness can be made thinner, making it possible to reduce weight.

Further, since the seal structure has the above-described configuration, it is particularly effective in a kingpin mechanism provided in a vehicle such as a golf car that runs on unpaved ground.

In the above-mentioned embodiment, an explanation was given of the case of an Elliot type king pin system in which a bifurcated shaft support is provided on the axle 1 side, but the present invention uses a reverse Elliot type king pin system in which a bifurcated shaft support is provided on the wheel axle 2 side. It is also applicable to

[Effect of idea]

As mentioned above, the present invention has one shaft end as a bifurcated shaft support, the other shaft end as a shaft support interposed between the bifurcated shaft supports, and these two shaft supports are connected via a king pin. In the wheel shaft support structure, a resin bushing is provided in the kingpin fitting hole of the upper side shaft support of the bifurcated shaft support, and the bush is protruded above the upper surface of the upper side shaft support so as to secure the upper end of the kingpin. A cylindrical portion that surrounds the portion of the king pin that fits into the fitting hole, and a flange that is interposed between the lower surface of the upper shaft support and the upper surface of the other shaft end. death,
In addition, the cap portion, cylindrical portion, and flange portion are integrally molded.

Therefore, the above-mentioned bushing with a cap protects the king pin from dust that tries to enter the fitting hole of the upper side shaft support, thereby reducing wear on the king pin and the surrounding shaft support. do. In addition, the above-mentioned bushing is integrally provided with a cap portion protruding upward from the upper surface of the upper shaft portion and a flange portion interposed between the lower surface of the upper shaft portion and the upper surface of the shaft portion of the other shaft end. , which enables easy attachment and detachment and reliable prevention of falling off after attachment. In addition, since the cap part protrudes upward from the upper surface of the upper shaft support, the king pin can be pivotally supported on the entire inner circumference of the fitting hole of the upper shaft support, thereby reducing the thickness of the upper shaft support. can be made thinner, making it possible to reduce weight.

[Brief explanation of the drawing]

The figure is a partially sectional front view showing a seal structure of a king pin according to an embodiment of the present invention. 1... Axle, 1a, 1b... (bifurcated) shaft support, 2... Wheel shaft, 2a... Axial support, 5... King pin, 6... Bush, 6a... Cap part,
6b...Cap part, 6c...Brim part.

Claims (1)

[Scope of utility model registration request] In the wheel shaft support structure in which one shaft end is a bifurcated shaft support, the other shaft end is configured as a shaft support interposed between the bifurcated shaft supports, and both of the shaft supports are connected via a king pin, A resin bush is provided in the kingpin fitting hole of the upper side shaft support of the bifurcated shaft support, and the bush is connected to a cap portion that protrudes above the upper surface of the upper side shaft support and encloses the upper end of the kingpin, and It is composed of a cylindrical part surrounding the part fitted into the fitting hole, and a flange interposed between the lower surface of the upper side shaft support and the upper surface of the shaft support of the other shaft end, and these cap parts, the cylindrical part, The seal structure of the king pin is characterized by integrally molded parts and flange parts.