JPS6239345A - Front brake device for front two-wheel steering vehicle - Google Patents

Abstract

PURPOSE:To reduce the number of parts and simplify the structure, by forming a brake drum integrally to a wheel hub supported rotatable at a knuckle and, at the same time, furnishing a brake panel integrally at the knuckle. CONSTITUTION:At the top of a swing arm 11L pivoted swinging up and down freely, is formed a knuckle support 12L, at which a knuckle 15L is supported rotatable around an axis 14L. And at a shaft 17L of the knuckle 15L is supported a wheel hub 19L rotatable. In such a structure, a brake drum 22L is formed integrally to the wheel hub 19L, and a panel body 24L of a brake panel 23L is fixed integrally to the knuckle 15L. Therefore, it is not necessary to arrange a connecting surface and a connecting measure for the brake panel 23L to the knuckle 15, resulting in a realization of a simple structure and a reduction of the number of parts.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a front brake device for a front two-wheel steering vehicle, and is mainly applied to four-wheeled motor vehicles (four-wheeled motorcycles) used off-road.
The present invention relates to a front brake device suitable for riding type vehicles, such as those that are driven with the crotch of the seat holding the river handle.

[Prior art]

BACKGROUND ART In a horse-riding vehicle (such as a four-wheeled motorcycle) that steers two front wheels, such as a buggy, a steering shaft that is pivotally supported at the front of the vehicle body is rotated, and the left and right wheels are steered by the rotation of the steering shaft.

In this case, a mechanism is employed in which the left and right knuckles for supporting the wheels and the steering shaft are connected by a tie rod, and the left and right knuckles are rotated in substantially the same direction around the vertical axis. Note that each knuckle is generally supported so as to be vertically movable via a front wheel suspension system. Further, a knuckle shaft that projects laterally is integrally formed on the knuckle, and a wheel hub is rotatably supported on the knuckle shaft.

Conventionally, as a brake device installed on such a steering wheel, a wide support surface that is perpendicular to the axle is formed on the knuckle, a brake panel is attached to the support surface with bolts, etc., and a brake drum is attached to the wheel hub. Those with a structure that forms were generally adopted.

[Matters to be solved by the invention]

However, in such a conventional front brake device for a two-wheel steering vehicle, the knuckle is a relatively large component because the brake panel is attached to the knuckle by forming a surface, and it also requires parts and processing for attaching the brake panel. The required structure was complicated and tended to be expensive.

〔the purpose〕

SUMMARY OF THE INVENTION An object of the present invention is to provide a front brake device for a two-wheel front steering vehicle that can reduce the number of parts and simplify the structure, and can also be made smaller and lighter.

[Means to achieve the purpose]

The present invention achieves the above object by a configuration in which a brake drum is integrally formed on a wheel hub and a brake panel is integrally provided on a knuckle by welding or the like.

〔Example〕

The present invention will be specifically described below with reference to the drawings.

FIG. 1 shows a front brake device for a two-wheel steering vehicle according to an embodiment of the present invention, and FIG. 2 shows a partial longitudinal section of FIG. 1.

In FIG. 1, a steering shaft 2 extending substantially vertically is rotatably supported at the front of a vehicle body frame 1 by a pillow pole bearing 3 and a split bush 4. As shown in FIG.

A bar-shaped handle 7 is fixed to a handle bracket 5 provided at the upper end of the steering shaft 2 by handle boulders 6, 6, and a manual lever 8 for operating the brake is attached to one side of the handle 7. A brake cable 18 is operated by this manual lever 8.

A tie rod connecting arm 9 is fixed to the lower part of the steering shaft 2, and one ends of tie rods IOL and IOR extending left and right are connected to the arm.

On the other hand, swing arms 11L and IIR extending left and right are pivotally supported in the lower central part of the frame 1 so as to be able to swing up and down, and knuckle supports 12L and 12R are provided at the tips of the swing arms IIL and 11R. There is.

These knuckle support parts 12 L, 12 R tray 7 tray 4
Shock absorber units 13L and 13R are connected between the upper part of the front wheel 1 and a front wheel suspension system.

The knuckle support parts 12L, 12R have an outwardly open mouth shape as shown in the figure, and the knuckles are rotatable about the axes 14L, 14R in the substantially vertical direction.
L and 15R are pivotally supported.

Each knuckle 15L and 15R is a knuckle arm 1 for steering.
6L, 16R and knuckle shaft 17 for wheel support
It is equipped with L and 17R.

The arm 9 of the steering shaft 2 and the left and right knuckles 15L, 15R (specifically, those knuckle arms 16L, 16R) are length-adjustable tie loft IOLs.
, are connected by IOR.

Shaft 17L with each knuckle 15L and 15R.

Wheel hubs 19L and 19R are rotatably supported on 17R. Wheel rims 20L and 20R are fixed to these wheel hubs 19L and 19R with bolts (not shown), and tires 21 are fixed to each wheel rim 2OL and 20R.
L and 21R are installed.

Brake drum 22 on each wheel hub 19L, 19R
L and 22R are integrally formed, and each knuckle 15
L, 15R (specifically knuckle shaft 17L, 17
Panel bodies 24L and 24R of brake panels 23L and 23R (FIG. 2) are integrally fixed to the base of H by welding or the like.

Figure 2 shows the knuckle 15L and wheel hub 19L.
The structure of the main part of the front brake device ([r side]) is shown. Since this brake structure has a substantially symmetrical structure for the left and right wheels, only the left wheel will be described below in FIG.

In FIG. 2, the brake panel 23L has an anchor pin 25L fixed to a panel body 24L fixed to a knuckle 15L, a camshaft 26L and a pair of brake shoes 27, and a camshaft 26L and a pair of brake shoes 27 attached thereto.
A brake lever 28L is coupled to the outer protrusion of the L.

The pair of brake shoes 27 are connected to shoe springs 29.
is held by the elastic force of

The panel main body 24L has its center hole fitted into the base of the knuckle shaft 17L, and a reinforcing plate 30 is applied.
By welding these, they are integrated with the knuckle 15L.

The panel body 24L also includes a bushing 31 for supporting the anchor pin 25L and a bushing 3 for supporting the camshaft 26.
2 is fixed by welding or the like. In the illustrated example, the anchor pin 25L is press-fitted into the bush 31 and then welded at its outer end to be integrated.

For brake panel 23L, especially anchor pin 2.
Precision is required in assembling the camshaft 26L (therefore the inner diameter of the bushing 31) and the camshaft 26L1 (therefore the bushing 32).

On the other hand, since the panel body 24L is welded to the knuckle 15L, welding distortion becomes a problem.

Therefore, the problem of welding distortion can be solved by processing and assembling the panel body 24L in the following order.

First, the bushes 31 and 32 are welded to the panel body 24L, and then these are welded to the knuckle 15L.

Next, the inner diameter and brake shoe side (inner) end surface of each bushing 3 and 32 are machined to desired precision.

After that, the anchor pin 25L is press-fitted into the bushing 31 and fixed in position. In this case, if necessary, as shown in the figure, the outer end surface of the bushing 31 and the anchor pin 25L are welded with a welding distance that does not cause thermal deformation. Unify.

The wheel hub 19L is supported by ball bearings 33 and 34 on the knuckle shaft 17L, and the wheel rim 20L is fixed to the wheel hub 19L with bolts 35 and nuts 36.

Further, the inner end of an operating cable 37 is connected to the brake lever 28L, and the outer end of the cable 37 is supported by a holder 38 provided on the knuckle arm 16L.

According to the embodiment described above, the brake panel 23L,
23R (specifically panel body 24L) to knuckle 15
Since it is integrated with L by welding, there is no need to provide a panel fastening surface and panel fastening means on the knuckle side as in the past, simplifying the structure and reducing the number of parts. Cost savings can also be achieved.

In addition, although the case of the cable-operated brake has been described in the illustrated example, the present invention can be similarly applied to the case of a hydraulic brake.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, there is provided a front brake device for a two-wheel front steering vehicle that can simplify the structure, reduce the number of parts, and be smaller and lighter.

[Brief explanation of drawings]

FIG. 1 is a schematic exploded perspective view of a front brake device for a front two-wheel steering vehicle according to an embodiment of the present invention, and FIG. 2 is a vertical cross-section showing the detailed structure of the main parts of the front brake device shown in FIG. It is a diagram. l-・-・-Vehicle frame, 12L, 12R-・・・・
Knuckle support part, 14L, 14R---Knuckle rotation axis, 15L, 15R---Knuckle, 19L, 19
R...-wheel hub, 22L, 22R--brake drum, 23L, 23R--brake panel,
24L, 24R---Panel body. Agent Patent Attorney Yasushi Ooto Figure 2

Claims (1)

[Claims] (1) A front two-wheel steering vehicle in which wheel support knuckles that can be rotated around an axis in the downward direction of the road are supported on the left and right sides of the front of the vehicle body, and a wheel hub is rotatably supported on the knuckles. A front brake device for a two-wheel front steering vehicle, wherein a brake drum is integrally formed on the wheel hub, and a brake panel is integrally provided on the knuckle by welding or the like.