JPH0710014A - Steering controller mounting structure of working vehicle - Google Patents

Abstract

PURPOSE:To effectively lock a control shaft which can freely come out from a controller in the steering controller locking structure of a working vehicle wherein with a power steering controller connected to a bracket which supports the lower end of power steering column from a lower position, a steering operation shaft and controller shaft are fittedly connected to each other. CONSTITUTION:A controller shaft 7a which can freely come out from a controller 7 is temporary tacked through a sheet metal construction stopper 15 which is fitted to the boss section 7b at the top of the controller 7 from the outside, and the stopper 15 is also utilized as a fitting member for aligning a steering column 8 which is fitted to the boss section 7b at the top of the controller 7.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a work vehicle such as a tractor and a riding lawn mower. More specifically, a power steering controller is connected to a lower end mounting bracket of a steering column of a power steering from below to form a steering operation shaft and a steering operation shaft. The present invention relates to a steering controller mounting structure for a work vehicle that is fitted and connected to a controller shaft.

[0002]

2. Description of the Related Art When connecting a controller of a power steering to a bracket for mounting a lower end of a steering column, for example, as shown in Japanese Patent Laid-Open No. 5-39045, a controller having a stud bolt on the upper surface thereof is used. The controller shaft and the steering operation shaft are fitted and connected to each other by being attached to the support bracket from below.

Since the controller is a commercially available product and the controller shaft is a product manufactured by the manufacturer who assembles a steering wheel whose dimensions are set according to the size of the model, etc. It is designed to be removable.

As shown in FIG. 7, in the steering column, the lower end portion of the steering column 8 is attached to the boss portion 7b on the upper surface of the controller 7, and the steering column 8 is provided.
It is adapted to be fitted and connected to the inner surface via a spigot 7c formed in a stepped manner.

[0005]

Since the controller shaft is constructed so that it can be inserted into and removed from the controller, there is a problem in that the controller shaft unexpectedly comes out when the controller is attached.

In addition, there is a processing troublesomeness in which a fitting portion for fitting the boss portion into the center is fitted to the lower end portion of the steering column.

The object of the present invention is to eliminate the above-mentioned drawbacks with a simple structural improvement.

[0008]

To achieve the above object, the present invention is characterized in that a controller shaft which can be freely inserted into and removed from a controller is inserted through a sheet metal stopper which is externally press-fitted into a boss portion on the upper surface of the controller. The sheet metal stopper is also used as a centering fitting member at the lower end of the steering column that is externally fitted to the boss.

[0009]

[Operation] Before assembling the controller to the support bracket,
By preliminarily fitting and pressing a sheet metal stopper onto the boss portion on the upper surface of the controller, the controller shaft can be temporarily fixed so as not to come out.

The sheet metal stopper for temporary fixing is
The outer periphery can be used as a fitting member for the steering column, and it is not necessary to form a fitting portion for fitting the boss portion at the lower end portion of the steering column.

[0011]

As a result of the above construction, the controller can be easily assembled without the controller shaft coming off, and it is necessary to form the fitting portion for fitting the boss portion at the lower end portion of the steering column. Instead, it is possible to use the temporary fixing member of the controller shaft to fit and connect the boss portion on the upper surface of the controller and the lower end portion of the steering column,
Has manufacturing advantages.

[0012]

EXAMPLES Examples of the present invention will be described below with reference to an agricultural tractor.

As shown in FIG. 6, the engine 2 is mounted on the front part of the machine body between the left and right front wheels 1a, the mission case 3 is arranged between the left and right rear wheels 1b, and the steering handle 4 is arranged on the center part of the machine body. An agricultural tractor is constructed by arranging a driver's seat 5 at the rear portion.

The front wheel 1a is a power steering type,
A controller 7 that can supply hydraulic oil to the hydraulic cylinder according to the amount of turning operation of the steering handle 4 and supplies the hydraulic oil to the hydraulic cylinder is provided below the steering handle 4.

As shown in FIG. 5, in the steering handle 4, the steering column 8, that is, the steering column 8 for rotatably supporting the steering operation shaft 9 is extended from a panel frame 10 to a support frame 11.
The steering column 8 is supported at its lower end by a support bracket 12 extending from the panel frame 10.

The controller 7 is fixedly connected to the lower surface of the support bracket 12 via bolts 13, and the steering operation shaft 9 and the controller shaft 7a are fitted and connected.

As shown in FIG. 1, the controller 7
Is fixedly connected to the support bracket 12 through the four stud bolts 13 on the upper surface thereof. Of the four stud bolts 13, two diagonal stud bolts 13a, 13a, that is, , The rear two stud bolts 13a, 13a in the machine front-rear direction are configured to have a minimum required length for the nut 14 to hook, and the remaining stud bolts 13
b and 13b are configured to be longer than the required minimum length.

Thus, of the four stud bolts,
Since the two are configured to have the required minimum length, if the controller 7 cannot be securely attached to the lower surface of the support bracket 12 due to the bolt being caught in the bolt hole, the two stud bolts having the required minimum length are provided. Nut 1 on 13a and 13a
It is possible to prevent accidental fixed connection as in the case where all four stud bolts are long and the four are not securely engaged.

The controller shaft 7a is removably fitted and connected to the controller 7. The middle of the controller shaft 7a is interposed between the boss portion 7b of the controller shaft 7a and the steering column 8. The sheet metal stopper 15 having the centering fitting function described above is attached in a state of being prevented from being pulled out.

The sheet metal stopper 15 is externally fitted and press-fitted into the boss portion 7b on the upper surface of the controller 7 in advance, and when the controller 7 is assembled, the controller shaft 7a is temporarily fixed so as not to come out and is used. ing.

In this tractor, as shown in FIGS. 4 and 6, the balance weight 17 mounted on the front portion of the vehicle body frame is used for mounting the battery 16 so that the battery 16 can be taken in and out in a wide space. The recess 16 is formed so that the battery 16 can be taken in and out from the side of the balance weight 17, and the battery 16 is fixedly connected to the balance weight 17 via a pull-out handle 16a.

[Other Embodiments] The work vehicle may be a riding lawn mower.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the configuration of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a lower end portion of a steering column.

FIG. 2 is a perspective view of a sheet metal stopper.

FIG. 3 is a cross-sectional plan view of the lower end of the steering column.

FIG. 4 is a plan view of the front of the machine body.

FIG. 5 is a partially cutaway side view of a control unit.

[Figure 6] Overall side view

FIG. 7 is a vertical sectional side view of the lower end of the steering column in the conventional structure.

[Explanation of symbols]

 7 Controller 7a Controller Shaft 7b Boss 8 Steering Column 9 Steering Operation Shaft 12 Support Bracket 15 Sheet Metal Stopper

Claims (1)

[Claims] 1. A steering shaft (9) and a controller shaft (7) for connecting a power steering controller (7) from below to a lower end support bracket (12) of a steering column (8) of the power steering.
In a steering controller mounting structure of a work vehicle for fitting and coupling with a), a controller shaft (7a) which can be freely inserted into and removed from the controller (7) is externally fitted and press-fitted into a boss portion (7b) on an upper surface of the controller (7). The sheet metal stopper (15) is used as a centering fitting member at the lower end of the steering column (8) that is fitted onto the boss (7b). Steering controller mounting structure for working vehicles.