JPH057118Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to the structure of a front brake device for a two-wheel steering vehicle, and in particular, to a brake device of this type consisting of an internally expanding drum brake operated by a cable. Regarding structure.

[Prior art]

As a steering device for riding-type vehicles such as buggies (four-wheeled bikes), which are driven by riding on the seat and holding the bar handle, the steering shaft pivoted at the front of the vehicle rotates and the movement is transmitted to the left and right front wheels. A steering type is used.

In this case, a mechanism is employed in which the left and right knuckles that pivotally support the wheels are connected to the steering shaft by a tie rod, and the left and right knuckles are rotated approximately around an axis in the vertical direction.

Note that the knuckle is generally supported so as to be vertically movable via a front wheel suspension system.

Further, the knuckle is integrally formed with a knuckle shaft that projects laterally, and the wheel hub of the front wheel is rotatably supported by the knuckle shaft via a bearing.

As a front brake device installed on such steering wheels, a brake drum is formed on the wheel hub, a brake panel is fixed to the knuckle, and a brake shoe attached to the brake panel slides against the brake drum. In some cases, an internally expanding drum type brake device is used. In addition, the brake operation method is as follows:
A cable operating mechanism may be used that transmits the movement of a manual lever provided on the handle to the brake panel via a cable.

[Matters that the present invention attempts to improve]

In this type of front brake device, a holder that supports the outer part of the brake cable is provided on the brake panel.

That is, when the brake panel main body is made of a disc-shaped steel plate, a structure has been adopted in which a metal fitting for a holder is welded to a predetermined position on the outer surface of the steel plate.

However, in this conventional structure, protrusions are provided on the outer surface of the flat panel, making the panel shape complicated.Also, when welding the holder, welding distortion occurs in the brake panel, so it is necessary to correct it and perform post-processing. Extra man-hours will be required.

〔the purpose〕

The purpose of the present invention is to provide a front brake device for a two-wheel steering vehicle in which the above-mentioned problems can be improved, the shape and structure of the brake panel can be simplified, and the problem of welding distortion can be eliminated. be.

[Means to achieve the purpose]

In the present invention, when a brake drum is provided on a wheel hub and a brake panel is fixed to a knuckle to constitute a brake means, a holder for holding an outer part of a brake operation cable is provided on a knuckle arm formed on the knuckle. This aims to achieve the above objectives.

〔Example〕

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

FIG. 1 schematically shows a front brake device and a steering device for a front two-wheel steering vehicle according to an embodiment of the present invention.

In FIG. 1, at the front of the vehicle body frame 1,
A steering shaft 2 that extends almost vertically has a pillow ball type bearing 3 and a split bush 4.
It is rotatably supported.

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

A tie rod connecting arm 9 is fixed to the lower part of the steering shaft 2, and one ends of tie rods 10L and 10R extending left and right are connected to this arm.

On the other hand, swing arms 11L and 11R extending from side to side are pivotally supported in the lower central part of the frame 1 so as to be able to swing up and down.
Knuckle support parts 12L and 12R are provided at the tip of R.

Buffer units 13L, 13 are provided between the knuckle support parts 12L, 12R and the upper part of the frame 1.
R are connected to form a front wheel suspension system.

As shown in the figure, the knuckle support parts 12L, 12R have an outwardly open shape, and knuckles 15L, 15R that are rotatable about shafts 14L, 14R in the substantially vertical direction are pivotally supported on the support parts. There is.

Each nutacle 15L, 15R has a steering (rotation)
Knuckle arms 16L, 16R for supporting the wheels and knuckle shafts 17L, 17R for supporting the wheels are integrally provided.

The arm 9 of the steering shaft 2 and the left and right knuckle arms 16L, 16R are connected by length-adjustable tie rods 10L, 10R.

Shaft 17L of each nuticle 15L, 15R,
Wheel hubs 19L and 19R are rotatably supported on 17R. These wheel hubs 19
Wheel rims 20L and 20R are fixed to L and 19R with bolts (not shown), and each wheel rim 2
Tires 21L and 21R are attached to 0L and 20R.

A brake drum 22L, 22R is integrally formed on each wheel hub 19L, 19R, while a brake panel 23 is formed on each knuckle 15L, 15R.
Panel bodies 24L and 24R of L and 23R (FIGS. 2 and 3) are integrally fixed by welding or the like.

FIG. 2 shows a longitudinal section of the brake means constituted by the brake drum 22L and the brake panel 23, and FIG. 3 shows a side view of the knuckle 15L and the brake panel 23L as seen from the line - in FIG.

Since the left and right brake means are of substantially symmetrical construction, only the left wheel will be described below in FIGS. 2 and 3.

In FIGS. 2 and 3, the brake panel 23L has an anchor pin 25L attached to a panel body 24L welded to the base of the nut shaft 17L.
At the same time, the camshaft 26L and the pair of brake shoes 27 are assembled, and the camshaft 26L and the pair of brake shoes 27 are assembled.
A brake lever 28L is connected to an outer protrusion of the brake lever 6L.

The pair of brake shoes 27 are held by the elastic force of a shoe spring 29.

The wheel hub 19L has a ball bearing 3
The brake shoe 27 is rotatably supported by the nutcle shaft 17L via pins 0 and 30, and the brake shoe 27 is held on the inner diameter of the brake drum 22L with a predetermined gap, and is arranged so as to cause sliding friction when the brake is operated. In other words, an inwardly expanding drum brake is configured.

Brake operation is performed by a brake cable 31L connected to the brake lever 28L. In addition, the right brake lever 28 (not shown)
A similar brake cable 31R is also connected to R.

These left and right brake cables 31L, 31R
is connected to one brake lever 18 (Fig. 1) whose other end is connected to the manual lever 8 (Fig. 1), and by operating the manual lever 8 (Fig. 1), the left and right braking means are activated simultaneously.

However, a knuckle arm 16L for rotating (steering) drive is integrally provided on the knuckle 15L, and a holder 32L that holds the outer part of the brake cable 31L is attached to the knuckle arm 16L.
It is fixed at L.

In the illustrated example, a holder support fitting 33L is welded to the knuckle arm 16L, and the holder 32L is fixed at a predetermined position and angle via the support fitting 33L.

A holder 32R (not shown) is provided on the right knuckle arm 16R in substantially the same manner.

4 and 5 show the brake cable 3
An example of the structure of the holder 32L and the holder 32L is shown below.
A dustproof cover 35 made of a rubber-like elastic material is attached to the tip of the holder 32L.

FIG. 6 shows another structural example of the brake cable 31L and the holder 32L. In this structure, the holder 32L has a cylindrical shape with both ends open, and the outer collar 36 of the cable 31L is brought into contact with the end surface of the holder 32L. At the same time, a dustproof cover 35 is attached to the tip of the outer.

According to the embodiment described above, the wheel hub 1
A holder for holding the outer parts of brake operation cables 31L, 31R when forming brake drums 22L, 22R on 9L, 19R and fixing brake panels 23L, 23R on nuts 15L, 15R to constitute a brake means. 32L, 32R to knuckle arm 16L, 1
Since it is provided on the brake panel 6R, compared to the conventional brake panels 23L and 23R, the panel body 2
The shape and structure of the panel bodies 4L and 24R can be simplified, and furthermore, it is possible to eliminate the trouble of correcting thermal deformation when assembling the panel bodies 24L and 24R by welding.

Therefore, according to the structure of the above embodiment, it was possible to achieve overall simplification of structure, improvement of productivity, and cost reduction.

[Effect of idea]

As is clear from the above description, according to the present invention, a front brake device for a two-wheel front steering vehicle can be obtained, which can simplify the structure and improve productivity.

[Brief explanation of the drawing]

FIG. 1 is a schematic exploded perspective view of a front brake device for a two-wheel steering vehicle according to an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of the front brake device shown in FIG. 1, and FIG. 2 is a side view of the brake panel and the nutcle seen from the line in FIG. 2, FIG. 4 is a vertical cross-sectional view showing an example of the structure of the holder, and FIG. 5 is a cross-sectional view of the holder taken from the line in FIG. 4. , FIG. 6 is a longitudinal sectional view showing another example of the structure of the holder. 15L, 15R...Natsukuru, 16L, 16R
... Natsukuru arm, 19L, 19R ... Wheel hub, 22L, 22R ... Brake drum, 2
3L, 23R...brake panel, 31L, 31
R...Brake cable, 32L, 32R...Holder.

Claims (1)

[Scope of utility model registration request] In a front two-wheel steering vehicle, in which knuckles for pivotally supporting wheel hubs of front wheels on left and right sides of the front part of the vehicle body are rotatably supported about an axis in a substantially vertical direction, a brake drum is provided on the wheel hub, and a brake drum is provided on the knuckles. A front two-wheel operation characterized in that a brake panel is fixed to constitute a brake means, and a knuckle arm for rotational drive formed integrally with the knuckle is provided with a holder for holding an outer part of a cable for brake operation. Front brake device of oncoming vehicle.