JPH0379221B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a steering drive shaft coupling device for operating a power steering unit attached to a vehicle chassis.

[Conventional technology]

Conventionally, as a coupling device for a steering drive shaft of this type, one described in Japanese Utility Model Application Publication No. 55-92569 is known.

Accordingly, what is described in the publication is related to the proposal of the applicant, which is a universal joint shaft (corresponding to a drive shaft) connected to the input shaft of a power steering unit mounted on a vehicle chassis. is divided into a front joint shaft and a rear joint shaft, and the front joint shaft and rear joint shaft are formed so that they can extend and slide relative to each other only in the longitudinal direction thereof, and are arranged within the cabin. The rear joint shaft is connected to a rear shaft connected to the front part of the steering handle shaft.

[Problem to be solved by the invention]

The above-mentioned conventional type does not have a support part when connecting the universal joint shaft and the rear shaft body, so it is difficult to connect the shafts to each other and assemble the cabin.
However, since the front wall surface of the cabin where the rear shaft body is drawn into the cabin is left open, there are defects such as external noise entering the cabin.

Therefore, a technical problem arises that must be solved in order to facilitate the mutual connection of the shafts and the assembly of the cabin, and to prevent noise from entering the cabin from the retracting part of the rear shaft body. , the present invention aims to solve this problem.

[Means for Solving the Problems] The present invention has been proposed to achieve the above object, and includes a drive shaft 19 at the rear of a drive shaft 19 for driving a power steering unit 2 mounted on a vehicle chassis 1. The front shaft body 21 further connects the front shaft body 21 to the cabin 1.
In a steering drive shaft coupling device, the transmission case 12 is coupled to a rear shaft body 24 coupled to the front part of the steering handle shaft 8 disposed in the steering wheel drive shaft, so as to be movable only in the axial direction. A rotatable spherical bushing 17 is attached to a bracket 15 attached to the bracket 15, and the front shaft body 21 is inserted into and supported by the spherical bushing 17. A hole 22a provided in the front wall 22 of the cabin 10 looks into the cabin 10 and is connected to the rear shaft body 24 connected to the steering handle shaft 8, and between the hole 22a and the front shaft body 21. It is an object of the present invention to provide a coupling device for a steering drive shaft, characterized in that a flexible boot 26 closes the steering drive shaft.

[Effect]

The present invention includes a rotatable spherical bush 17 attached to a bracket 15 attached to a mission case 12.
By attaching the spherical bushing 17 and inserting the front shaft body 21 into the spherical bushing 17 to support it,
The cabin 10 can be attached to the chassis 1 by simply lowering it from above, and the front shaft body 2
1 and the rear shaft body 24 that has been previously attached to the cabin 10 side can be easily connected.

Further, the rear part of the front shaft body 21 is inserted into the hole 22a of the front wall 22 of the cabin 10 so as to be exposed to the cabin side, and a flexible boot is inserted between the hole 22a and the front shaft body 21. 26, it is possible to prevent noise from the outside from entering the cabin 10 as much as possible.

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the accompanying drawings. For convenience of explanation, conventionally known technical matters will also be explained at the same time.

In FIG. 1, a power steering unit 2 attached to a vehicle chassis 1 rotates an input shaft 3 to cause a gear mechanism installed in the power steering unit 2 to drive an operating mechanism to move a knuckle arm 4. It has a structure in which the left and right front wheels 5, 5 are steered via a drag rod 6 connected to a knuckle arm 4.

A steering handle shaft 8 to which the steering handle 7 is attached is rotatably supported by a handle post 9, and the handle post 9 is attached to a panel 11 attached to a cabin 10. The cabin 10 is attached to a transmission case 12 constituting the vehicle chassis 1 via vibration isolators 13 and 14.

Therefore, as shown in Figure 2, the mission case 12
A spherical bushing 17 is rotatably supported on a bracket 15 attached to a bracket 15 via a presser fitting 16, and a drive shaft 19 is connected to the input shaft 3 via a universal joint 18. The shaft body 21 is connected to the spherical bush 1.
The front shaft body 21 inserted into the cabin 10
The rear part of the front shaft body 21 is formed into a fitting boss part 21a with a non-circular cross section as shown in FIG. 23, the front part of the rear shaft body 24 is formed into a fitting hole part 24a having a non-circular cross section, and when the fitting hole part 24a and the fitting boss part 21a are fitted, the front part shaft body 21 and the rear part The shaft bodies 24 are made movable relative to each other only in the axial direction.

One or both of the fitting boss portion 21a and the fitting hole portion 24a is coated with Teflon resin to ensure smooth sliding movement and to improve vibration absorption.

Further, the reference numeral 25 is a bush screwed into the fitting hole 24a, and the hole 22a is connected to the front shaft body 21.
The gap is closed with a flexible boot 26. Thus, the boot 26 connects the hole 22a and the front shaft body 2.
By closing the space between the cabin 10 and the cabin 10, external noise is prevented from entering the cabin 10 as much as possible.

The steering drive shaft coupling device of the present invention includes a drive shaft 19 for driving a power steering unit 2 mounted on a vehicle chassis 1.
The front shaft body 21 connected to the rear of the chassis 1
The rear shaft body 24, which is connected to the front part of the steering handle shaft 8 which is pivotally supported by the engine and which is pivotally supported by the cabin 10, is connected to the front shaft body 21 so as to be movable only in the axial direction. 27 and the chassis 1 to the drive shaft 19, the vibrations are transmitted through the fitting boss portion 21a and the fitting hole portion 24a.
It is absorbed by the back-and-forth sliding movement of the steering wheel shaft 8 and is hardly transmitted to the steering handle shaft 8, so that the steering handle 7 feels good to the touch. Further, when assembling the cabin 10 and the steering mechanism into the chassis 1, the handle post 9 and the steering handle shaft 8 are attached to the cabin 10, the rear shaft body 24 is connected to the steering handle shaft 8, and the cabin 10 is assembled.
is attached to the chassis 1, and the rear shaft body 2 is attached to the front shaft body 21 which is inserted into the spherical bushing 17.
4 and connect the front shaft body 21 to the drive shaft 19 by the universal joint 20.
The assembly of the cabin 10 and the steering mechanism can be completed easily.

〔Effect of the invention〕

In the present invention, the front shaft body 21 has a spherical bush 1.
Since cabin 1 is supported on the fuselage by
0 from above, the front shaft body 21 and the rear shaft body 24 can be easily connected, making the assembly work of the cabin 10 extremely easy, and furthermore, noise does not enter the cabin 10, making it more comfortable. Become.

[Brief explanation of drawings]

The figures show one embodiment of the present invention, in which Fig. 1 is a cutaway side view of the main parts of the tractor, Fig. 2 is an enlarged view of the main parts in Fig. 1, and Fig. 3 is A-A in Fig. 2. FIG. Explanation of symbols 1...Vehicle chassis, 2...Power steering unit, 3...Input shaft, 4...Knuckle arm, 5...Front wheel, 6...Drag rod,
7... Steering handle, 8... Steering handle shaft, 9... Handle post, 1
0...cabin, 11...panel, 12...mission case, 13, 14...vibration isolating material, 15...
Bracket, 16... Holder fitting, 17... Spherical bushing, 18, 20, 23... Universal joint, 19
... Drive shaft, 21 ... Front shaft body, 21a ... Fitting boss portion, 22 ... Front wall, 2
2a...hole, 24...rear shaft body, 24a...
...fitting hole, 25...button, 26...flexible boot, 27...engine.

Claims (1)

[Claims] 1 A front shaft body 21 is connected to the rear part of a drive shaft 19 for driving a power steering unit 2 mounted on the chassis 1, and the front shaft body 21 is further disposed within the cabin 10. A bracket 15 attached to a transmission case 12 is connected to a rear shaft body 24 connected to the front part of a steering handle shaft 8, which is movable only in the axial direction. A rotatable spherical bushing 17 is attached to the spherical bushing 17, and the front shaft body 21 is inserted and supported by the spherical bushing 17. Furthermore, the front shaft body 21 is attached to the front wall 22 of the cabin 10. It is connected to the rear shaft body 24 which is connected to the steering handle shaft 8 and looks into the cabin 10 through a hole 22a provided in the front shaft body 2.
1. A steering drive shaft coupling device characterized in that a flexible boot 26 closes the space between the steering drive shaft and the steering shaft.