JPH0649487Y2 - Work vehicle steering operation structure - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention is configured such that a steering pedestal for pivotally supporting a steering pinion gear and a sect gear meshing with the steering pinion is formed in a substantially box shape with an open lower portion. The present invention relates to a steering operation structure of a work vehicle in which a stand is mounted and fixed on a flat body frame.

[Conventional technology]

As a conventional upper structure, for example, as shown in FIG. 5, the member for supporting and attaching the steering receiver (13) to the body frame is a plate member provided with a welding nut (17) for bolt connection to the body frame. In (14), the vertical plate member (18) formed in a shape corresponding to the pedestal for receiving and supporting the pedestal is welded to the front and rear portions and the intermediate portion, respectively.

[Problems to be solved by the device]

In the above conventional structure, in order to improve the maneuverability, the pinion gear connected to the steering shaft standing in a rearwardly inclined posture is pivotally supported, so that the rear upper surface is inclined, and a large supporting strength is obtained. Therefore, the front and rear inclined surfaces and the intermediate protruding portion of the substantially mountain-shaped steering pedestal that is inclined in the direction intersecting the front upper surface are respectively supported by the vertical plate member. However, each vertical plate member must be separately welded and attached, and there is a problem that the number of parts is large and the number of assembling steps is large, resulting in high cost.

An object of the present invention is to provide a steering operation part structure of a work vehicle which pays attention to the shape of a steering pedestal, simplifies the structure by rational structural improvement, and can reduce the cost.

[Means for Solving the Problems]

A feature of the present invention is that, in the steering operation structure of a work vehicle having the above-described structure, the upper ends of both side bent portions of a plate material bent and formed in an upward U-shape are welded and fixed to the inner surface of the cradle, and the plate material is fixed. It is fixed to the body frame with bolts, and its actions and effects are as follows.

[Action]

In other words, both ends of one plate material are bent and formed, and the bent end portions of the plate material are welded and fixed to the front and rear inner surfaces of the steering pedestal. At this time, the front part of the steering pedestal is a plane orthogonal to the steering shaft in order to pivotally support the pinion gear and the sect gear,
The parts with the same height are straight along the left-right direction,
The same applies to the rear side, and the upper end edge of the bent portion of the plate member is welded in a state in which the entire area is in contact with the steering pedestal, so that firm fixing can be performed.

[Effect of device]

Therefore, although it is possible to firmly support the steering pedestal, it is only necessary to bend and form a single plate material in the same direction without providing an individual vertical plate member along the steering pedestal, and the number of parts is reduced. In addition, the number of assembling steps can be reduced and the cost can be reduced.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 4 shows a riding lawn mower which is an example of a work vehicle. This lawnmower has a pair of left and right wheels (1),
(2), the engine (4) is mounted in the front part of the airframe frame (3), the mission case (5) is arranged in the rear part, and the control part (6) is provided in the upper center of the airframe. is there.

As shown in FIG. 3, the steering section (6) is provided with steering wheels (7) for steering the front wheels (1) and (1), and the steering shaft (8) is erected in a rearward tilted posture. It is set up. A pinion gear (9) is attached to the lower end of the steering shaft (8), and a sect gear (1) that engages with the pinion gear (9) is provided in front of the pinion gear (9).
0) is provided, and a pitman arm (12) linked to the front wheels (1) and (1) is attached to the lower part of the rotation support shaft (11) of the sect gear (10) via a link mechanism.

The pinion gear (9) and the sect gear (10) are axially supported by a steering box (13) having a substantially box shape that opens downward.
3) is attached and fixed to the body frame (3) through the plate material (14).

More specifically, as shown in FIGS. 1 and 2, the steering pedestal (13) has a box shape formed in a mountain shape in side view, and the pinion gear (9) and the sect gear (9) and the sect gear are formed on the rear side inclined surface (13a). (10) Respective shaft support parts (15) and (16) are formed. The upper ends (14a) and (14b) of both side bent portions of the plate material (14) bent and formed in the upward U-shape are welded and fixed to the inner surface of the pedestal (13). This board material (14)
Is provided with three welding nuts (17), which are bolted from the lower surface of the flat body frame (3) and fixedly connected to the frame (3) to reinforce and support the pedestal (13). I am doing it.

At this time, the front side inclined surface (13b) and the rear side inclined surface (13b) of the cradle (13) have the same inclination angle over the entire left and right width, and the portions having the same height are in the left and right directions. The upper ends (14a) and (14b) are welded in a state of being in contact with the respective surfaces (13a) and (13b).
Strong connection support can be performed.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

1 to 4 show an embodiment of a steering operation part structure of a work vehicle according to the present invention, and FIG. 1 is a perspective view of a main part,
FIG. 2 is a vertical side view of a main part, FIG. 3 is a perspective view of a machine frame, and FIG. 4 is an overall side view of a riding lawn mower. FIG. 5 is a perspective view showing the conventional structure. (3) …… Airframe, (9) …… Pinion gear,
(10) …… Sect gear, (13) …… Steering pedestal, (14) …… Plate material, (14a), (14b) …… Upper end.

Claims (1)

[Scope of utility model registration request] 1. A steering box (13) for pivotally supporting a steering pinion gear (9) and a sect gear (10) meshing with the steering pinion (9) is formed in a substantially box shape with its lower part opened, and the steering box (13) is formed. A flat body frame (3)
In the steering operation structure of a work vehicle mounted and fixed on the upper part, the upper ends (14a) and (14b) of both side bent parts of a plate material (14) bent and formed in an upward U-shape are fixed to the cradle (13).
The steering operation part structure of the working vehicle in which the plate material (14) is fixed to the inner surface of the vehicle by welding and the plate material (14) is fixed to the machine body frame (3) by bolts.