JP2001260831A - Braking device of trailer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide two systems of braking devices capable of working independently as a braking device for a trailer, with a simple and inexpensive structure. SOLUTION: The trailer is equipped with an inertia brake device comprising a counter lever 4 rotated by the inertia of the trailer relative to a tow car, a brake lever 9 for an inertia brake, and a brake wire 5 for the inertia brake to connect the counter lever 4 to the brake lever 9 for the inertia brake, and a parking brake device comprising an operating lever 6, a brake lever 10 for the parking brake, and a brake wire 7 for the parking brake to connect the operating lever 6 to the brake lever 10 for the parking brake is mounted to the trailer. The brake lever 9 for the inertia brake and the brake lever 10 for the parking brake rotate independently and thereby, a brake shoe 16 is pressed onto a brake plate 11 in order to apply braking.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a trailer, and more particularly to a braking device for a small trailer.

[0002]

2. Description of the Related Art For example, a braking device for a small trailer that carries and transports motorcycles, small boats, and the like is originally composed of a main brake and a parking brake.

Conventionally, a hydraulic brake equipped with a hydraulic master cylinder, a hydraulic pipe, a wheel cylinder, a wheel drum, and the like is generally used as a main brake, and a parking brake rotates integrally with a wheel. A structure which is composed of a combination of a brake plate and a lock pin provided on the vehicle body side and in which a lock pin is inserted into and engaged with a hole of the brake plate by manual operation is usually used.

[0004]

The above-mentioned conventional main brakes are exaggerated as brakes for small trailers.
There is a problem that it is expensive and heavy.
Also, among the small trailers, if the total weight of the trailer (total weight in a standard loaded state) is 750 kg or less, the main brake is omitted if the braking force of the connected vehicle has a braking distance of 22 m or less. Is also good,
In the past, many vehicles were equipped with only parking brakes.However, even with parking brakes, no matter how small or light the trailer is, the towing vehicle can be pushed up from behind by the inertia of the trailer. are doing.

Further, in a conventional parking brake of the type in which a lock pin is fitted into and engaged with a hole of a brake plate, locking can be performed only when the hole of the brake plate and the lock pin match, so that the hole of the brake plate is aligned with the lock pin. If not, it is necessary to perform a troublesome operation such as moving the car back and forth a little, aligning the hole of the brake plate with the lock pin, and then applying the brake.

An object of the present invention is to address the above-mentioned conventional problems.

[0007]

According to the present invention, a counter lever which rotates by inertia of a trailer with respect to a towing vehicle, a brake lever for inertial brake, and a brake lever for inertial brake are connected to the counter lever. A trailer is provided with an inertia brake device including a brake wire for an inertia brake, and an operation lever, a brake lever for a parking brake, and a brake for a parking brake connecting the operation lever and a brake lever for a parking brake. A parking brake device comprising a wire is attached to a trailer, and the brake lever for inertia brake and the brake lever for parking brake can operate the brake shoes independently to perform braking.

As described above, since the inertia brake device and the parking brake device, which are extremely simple in construction and are lightweight and inexpensive, are provided so as to operate independently of each other, it is possible to carry out vehicle inspection even for a trailer exceeding a total weight of 750 kg. For a small trailer with a gross weight of 750 kg or less, the trailer is braked during traveling, and the braking force of the entire connected vehicle is increased, so that the towing vehicle is not pushed up from behind by the trailer. , Comfortable driving becomes possible.

[0009]

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

In FIG. 1, reference numeral 1 denotes a coupler for connecting to a towing vehicle (not shown).
Is bolted to the front end.

A rear portion of the push rod 2 is inserted and supported in a front end portion of the draw bar 8 of the trailer so as to be slidable in a predetermined range in the front-rear direction, and a pressing plate 2a provided at a rear end of the push rod 2 is provided. One end of the counter lever 3 rotatably attached to the drawbar 8 is brought into contact with the drawbar 8,
When the push rod 2 moves rearward, the pressing plate 2a presses and rotates the counter lever 3. The other end of the counter lever 3 is connected to the front end of a brake wire 5 for inertia brake, and the rear end of the brake wire 5 is connected to one end of a brake lever 9 for inertia brake described later. 3a is a return spring of the counter lever 3.

The drawbar 8 is made of a section steel having a U-shaped cross section, and has two insertion support plates 8a, 8a, 8
8a are fixed by welding, and the front and rear insertion support plates 8a,
The rear portion of the push rod 2 is slidably fitted and supported in the insertion hole 8a.

Reference numeral 4 denotes a double-acting shock absorber disposed in the drawbar 8. The rear end of the body of the shock absorber 4 is pinned to the drawbar 8, and the tip of the piston of the shock absorber 4 is connected to the push rod 2. The push rod 2 is connected to the rear end, so that the push rod 2 is moved forward and backward by the shock absorber 4.

An operation lever 6 for parking brake is mounted on one side of the drawbar 8 at a position behind the counter lever 3 so as to be rotatable.
Is connected to a front end of a brake wire 7 for parking brake, and a rear end of the brake wire 7 is connected to a brake lever 10 for parking brake described later. A ratchet and an engagement claw that meshes with the ratchet are provided between the operation lever 6 and a bracket that rotatably supports the operation lever 6, and when the operation lever 6 is rotated rearward as shown by a chain line, When the engaging claw is engaged with the ratchet to hold the operating lever 6 at the rotation position shown by the dashed line, and when returning from the rotation position shown by the dashed line to the original solid line position, the engaging claw is pressed by pressing the push button 6a of the knob. The engagement mechanism consisting of the ratchet and the engagement claw is generally provided on a side brake lever of a vehicle. Since the mechanism is the same as that described above, detailed illustration and description are omitted.

Reference numeral 11 denotes a brake plate.
Reference numeral 1 denotes a wheel hub 13 which is rotatably fitted to and supported by an axle 12 via a bearing together with a wheel disc (not shown) together with bolts and nuts. A tire is mounted on an outer peripheral rim portion of the wheel disc fixed to the wheel hub 13, and a wheel of a trailer is formed by the wheel hub, the wheel disc, the tire, and the like. These wheel structures are widely used conventionally. Since it is well known, detailed illustration and description are omitted.

A bracket 14 having a substantially U-shaped cross section is fixed to the axle 12 fixed to the trailer body, and the brake lever 9 for the inertia brake and the brake lever for the parking brake are fixed in the U-shaped cross section of the bracket 14. 10 are mounted so as to be overlapped with each other and rotatable independently of each other by a single pivot 15. The brake levers 9 and 10 are provided with a brake shoe 16 on one shaft 17.
When the brake wire 5 or 7 is pulled forward and the brake lever 9 or 10 rotates around the pivot 15, the shaft 17 moves in the direction of the brake plate 11, and the brake shoe 16 It is strongly pressed against and brakes. 9a and 10a indicate return springs of the brake levers 9 and 10, respectively.

The illustrated embodiment shows an example in which the bracket 14 is fixed to the axle 12, and the brake levers 9 and 10 and the brake shoe 1 are constructed in this manner.
6 can be assembled into the axle 12 to form a sub-assembly, which is extremely effective in that the assembling work can be simplified. However, the present invention is not limited to this, and the bracket 14 is attached to the body of the trailer. The structure may be fixed.

In the above, the trailer is a coupler 1 having a front end.
When the towing vehicle is braked and decelerated while the vehicle is connected to a towing vehicle (not shown), a rearward pressing force acts on the coupler 1 due to the inertia of the trailer, and the front end of the pusher is fixed to the coupler 1. The rod 2 slides rearward with respect to the drawbar 8, and presses and rotates the counter lever 3 with the pressing plate 2a. Then, the brake wire 5 is pulled forward, and the brake lever 9 for inertia brake rotates around the pivot 15 to press the brake shoe 16 against the brake plate 11, and the trailer is brought into a braking state. During the braking operation of the inertial brake, the shaft 17
With the movement of the brake lever 11 toward the brake plate 11, the parking brake lever 10 is also pulled and turned, but the rotation of the brake lever 10 is absorbed by the slack of the brake wire 7, and the operation lever 6 Has no effect at all.

From this braking state, the coupler 1
Is pulled forward, the push rod 2
To slide forward. Then, the counter lever 3 is rotated by the return spring 3a following the forward movement of the pressing plate 2a, the brake lever 9 is rotated in the braking release direction by the return spring 9a, and the brake shoe 1 is rotated.
6 is separated from the brake plate 11 and the braking is released. Along with that, the brake lever 10 for the parking brake is also returned to the original state by the return spring 10a.

The impact relative movement of the push rod 2 in the front-rear direction with respect to the drawbar 8 caused by the inertia of the trailer is buffered by the shock absorber 4.

At the time of parking, the operation lever 6 is rotated backward as shown by a chain line. Then, the brake wire 7 is pulled forward, and the brake lever 10 for the parking brake pivots around the pivot 15 to press the brake shoe 16 against the brake plate 11 and the parking brake is applied.
In this case, with the movement of the shaft 17 in the direction of the brake plate 11 due to the rotation of the parking brake brake lever 10,
The brake lever 9 for the inertial brake is also pulled and rotated, but the rotation of the brake lever 9 is absorbed by the slackness of the brake wire 5 and does not affect the counter lever 3 or the push rod 2 at all.

When the operating lever 6 is rotated forward while the push button 6a of the knob is pressed to return to the original position shown by the solid line, the brake lever 10 is rotated in the braking release direction by the return spring 10a. The brake shoe 16 is separated from the brake plate 11 and the parking brake is released. Along with this, the brake lever 9 for the inertial brake
Also returns to the original state by the return spring 9a.

In the above, the brake levers 9 and 10
The length from the pivot 15 which is the center of rotation of the shaft to the shaft 17 for mounting and supporting the brake shoe 16 is configured to be much shorter than the length from the pivot 15 to the connection point with the brake wires 5 and 7. The brake shoe 16 is strongly pressed against the brake plate 11 by a slight pulling force of the brake wire, and the reaction force during braking can be easily and accurately supported by the bracket 14.

[0024]

As described above, according to the present invention, a trailer equipped with two independent braking systems of an inertial braking device and a parking braking device can be obtained with a very simple structure. Different vehicle gross weight 750K
If applied to a trailer exceeding g, vehicle inspection can be handled. For trailers with a gross vehicle weight of 750 kg or less, not only is the vehicle inspected, but also the inertia braking device brakes the trailer while traveling, so that the braking force of the entire connected vehicle increases, and the towing vehicle is moved rearward by the trailer. This allows comfortable driving without being pushed by the user, and can bring about a great effect in practical use in combination with the small size, light weight, and low cost.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention, in which (A) is a plan view of a trailer to which a braking device according to the present invention is applied,
(B) is a side view of (A).

FIG. 2 is an enlarged detailed view of a front portion of the trailer shown in FIG. 1, wherein (A) is a plan view and (B) is a side view.

3A and 3B are detailed views of a brake device provided on a wheel portion of the trailer shown in FIG. 1, wherein FIG. 3A is a plan view and FIG. 3B is a front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Coupler 2 Push rod 3 Counter lever 4 Shock absorber 5 Brake wire for inertia brake 6 Operating lever 7 Brake wire for parking brake 8 Drawbar 9 Brake lever for inertia brake 10 Brake lever for parking brake 11 Brake plate 12 Axle 13 Wheel hub 14 Bracket 15 Axis 16 Brake shoe 17 Axis

Claims (3)

[Claims] 1. A counter lever which rotates by inertia of a trailer with respect to a towing vehicle, a brake lever for inertia brake, and a brake wire for inertia brake connecting the counter lever and a brake lever for inertia brake. A trailer is provided with an inertial brake device and a parking brake device comprising an operation lever, a brake lever for a parking brake, and a brake wire for a parking brake connecting the operation lever and a brake lever for a parking brake. Wherein the brake lever for the inertia brake and the brake lever for the parking brake can operate the brake shoes independently to perform braking. 2. The trailer braking device according to claim 1, wherein a push rod having a front end fixed to a coupler connected to the towing vehicle is supported by a drawbar of the trailer so as to be slidable in a predetermined range in the front-rear direction. At the same time, a shock absorber for buffering forward and backward sliding of the push rod is mounted on the drawbar, and the counter lever is pressed and rotated by the backward sliding of the push rod, and the forward sliding of the push rod is performed. A trailer braking device, wherein the counter lever is configured to be rotated by the spring force of a return spring. 3. A brake system for a trailer according to claim 1, wherein the brake lever for the inertial brake and the brake lever for the parking brake are independent of a bracket fixed to an axle fixed to the trailer body. The brake shoe is mounted and supported by a single pivot on the brake lever for the inertia brake and the brake lever for the parking brake so that the brake shoe can rotate. With the rotation of the brake lever for inertial braking due to the rotation of the counter lever due to inertia, or the rotation of the parking brake brake lever due to the rotation operation of the operation lever in the braking direction, the brake shoe is brought into contact with the wheels of the trailer. A tray that is configured to be pressed against a brake plate that rotates integrally to be in a braking state. Brake system of the car.