JPH0371294B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a brake device for a vehicle in which a regular drum brake also functions as a parking brake.

[Prior Art] Conventionally, for example, in "Publication of Utility Model Publication No. 52-3249",
A motorcycle has been disclosed in which a brake operation system for parking is provided independently of a brake operation system for regular use, so that the brake for regular use can be used as a brake for parking.

In this conventional brake, a single brake lever that rotates together with the camshaft of the drum brake is attached to the camshaft. This brake lever has two long and short holes curved in an arc shape, and the brake pedal rod is connected to one of the long holes via a pin, and the other long hole is connected to the brake pedal rod through a pin. A rod is connected to the stand via a pin. The above pin is
It is always slidably fitted into the elongated hole, and is hooked to one end of the elongated hole when the brake is not operated.

Therefore, when the brake pedal is operated, the brake lever is rotated via the pin hooked to one of the elongated holes, and the drum brake is actuated. Also, at this time, the pin linked to the stand is
Since the brake lever rotates before the pin, it appears that the brake lever simply slides inside the elongated hole, and the rod connected to the stand does not move.

Conversely, when the stand is erected, the brake lever is rotated via the pin hooked to the other elongated hole, and the drum brake is activated. At this time, the pin linked to the brake pedal rod is
Similarly to the above, the structure is such that the brake lever simply slides in the elongated hole and the brake pedal rod does not move.

[Problems to be Solved by the Invention] However, in the case of this conventional configuration, the pin connected to the two rods is always fitted into the long hole of the brake lever, so it is difficult to maintain smooth brake operability. , it is necessary to allow the pin to slide smoothly within the elongated hole. For this reason, the shapes and dimensions of the long holes and pins must be determined with high precision, which causes problems such as dimensional control and maintenance inspection of the parts becoming troublesome.

Moreover, since the long hole and the pin repeatedly slide each time the brake is operated, over a long period of use, the edges of the long hole and the outer circumferential surface of the pin will wear out, causing looseness between the long hole and the pin. There is a possibility that smooth sliding may be hindered. Then, when the brake lever is rotated via one pin, the other pin gets caught in the elongated hole, preventing smooth rotation of the brake lever and making it difficult to operate the brake. In addition, when the brake pedal is operated, the movement of the brake arm is transmitted to the rod, causing problems such as undesirable movement of the stand.

The present invention has been made based on the above circumstances, and can reliably prevent the inconvenience that the non-operating side brake operating system is operated at the same time when operating the regular brake or parking brake, and furthermore, To provide a braking device for a vehicle that does not require excessive force to be applied to a connecting member that connects a brake arm and a brake operator, has a simple structure, and is inexpensive.

[Means for Solving the Problems] Therefore, in the present invention, in a vehicle whose wheels are braked by a drum brake, the drum brake is provided with a camshaft for rotating the brake shoe in a direction to press the inner surface of the drum. , on this camshaft, the first
A brake arm and a second brake arm are each attached to be rotatable independently, and the first brake arm is connected to a regular brake operator via a first connecting member, and the second brake arm is connected to a regular brake operator via a first connecting member. The operator is connected to a parking brake operator via a second connecting member, and a rotating arm that is rotated integrally with the camshaft is provided between the first and second brake arms. , between the first and second brake arms and the rotating arm, when one of the brake arms is operated to rotate, the rotating arm engages with the rotating arm so as to be able to come into contact with and separate from the rotating arm. The present invention is characterized in that an interlocking means is provided for causing the movable arm to follow the rotationally operated brake arm and rotate the movable arm.

[Operation] In this configuration, when the regular brake operator is operated, the first brake arm is independently rotated on the camshaft. This rotation of the first brake arm causes the interlocking means to engage with the rotation arm, and the rotation arm follows and rotates together with the first brake arm. Therefore, the camshaft is rotated and the brake shoe is pressed against the inner surface of the drum.

Further, at this time, since the second brake arm and the camshaft are relatively rotatable, the rotation of the camshaft is not transmitted to the second brake arm. At the same time, as the rotating arm rotates, the interlocking means also separates from the second brake arm, so the rotating arm including the interlocking means and the second brake arm are separated from each other, and the rotating arm is separated from the second brake arm. Rotation is not transmitted to the second brake arm.

When the parking brake operator is operated, the second brake arm and rotating arm only rotate together due to the same operation as above, and the first brake arm remains as it is without rotating. is held in this position.

Therefore, the brake operation systems on the non-operated side are not operated at the same time.

Furthermore, since the rotational force of the rotating arm does not need to be transmitted to the non-operating side connecting member, no unreasonable force is applied to this connecting member, and sagging or buckling of this connecting member can be prevented.

[Embodiment] An embodiment of the present invention will be described below based on drawings in which the present invention is applied to a tricycle.

Figure 1 is a plan view of a tricycle.
In the figure, reference numeral 1 indicates one front wheel, and 2 indicates two left and right rear wheels. The front wheel 1 is supported by a front fork 3 and is steered by a handle 4. Further, the rear wheels 2 are attached to both ends of the drive shaft 5.

In FIG. 1, reference numeral 6 indicates a fuel tank, 7 indicates a seat, and 8 indicates a pair of left and right footrests.

The drive shaft 5 is supported between left and right frame members 9. That is, as shown in FIG. 2, a cylindrical bearing housing 10 is bolted between the left and right frame members 9.
A drive shaft 5 is inserted inside this bearing housing 10. This drive shaft 5 is
It is rotatably supported by a bearing housing 10 via a ball bearing 11. Drive shaft 5
Both ends of the drive shaft 5 are led out from the bearing housing 10, and a drum brake 12 is provided at one end of the drive shaft 5.

The drum brake 12 includes a drum 13 that is open on the bearing housing 10 side. A boss portion 14 is formed in the center of the drum 13. The boss portion 14 is spline-engaged with the outer peripheral surface of the drive shaft 5, and due to this engagement, the drum 13 and the drive shaft 5 are rotated together.

A sprocket 15 is bolted to the side surface of the drum 13. A chain 17 is wound between this sprocket 15 and an engine drive sprocket 16. Therefore, the power of the engine is transmitted from the chain 17 through the drum 13 to the drive shaft 5 of the rear wheel 2.

A brake shoe plate 18 is integrally formed at the end of the bearing housing 10 on the drum 13 side. The brake show plate 18 is
The brake shoe plate 18 covers the opening of the drum 13, and one end portion of a pair of brake shoes 20 having a lining portion 19 is rotatably supported on the brake shoe plate 18. A cam 21 is interposed between the other ends of the brake shoe 20. cam 2
1 is for rotating the brake shoe 20 in the direction of pressing it against the inner surface of the drum 13. A camshaft 22, which is integrated with the cam 21, penetrates the brake shoe plate 18 and extends to the outside of the drum 13. It has been derived.

Note that the pair of brake shoes 20 are always urged by a return spring 23 so as to rotate in a direction away from the inner surface of the drum 13.

Incidentally, the base ends of a first brake arm 24 and a second brake arm 25 are attached to the distal end of the camshaft 22 so as to be rotatable in a direction around an axis. The tip of the first brake arm 24 is connected to the first brake wire 2 as a connecting member.
6 to a regular brake lever 29, and the tip of the second brake arm 25 is connected to a parking brake lever 30 via a second brake wire 27 as a connecting member. Both of these brake levers 29,3
0 is provided on the left grip portion 28 of the handle 4. The parking brake lever 30 is attached to a lever holder 3 provided on the grip portion 28.
1 through a pivot shaft 32, and can be rotated toward the front as shown by the arrow in FIG. In this case, as the parking brake lever 30 is rotated, the connecting portion A of the brake wire 27 on the brake lever 30 is
is located on the opposite side of the pivot shaft 32, that is, beyond the dead point, the brake lever 3
0, since the biasing force of the return spring 23 is acting through the brake wire 27, this biasing force acts as a force that tries to pull the brake lever 30 further in the rotation operation direction. . For this reason, even if the brake lever 30 is released, the brake lever 30 does not return to its natural position.

On the other hand, a rotating arm 34 is attached to the tip of the camshaft 22. Rotating arm 34
are the first and second brake arms 24, 25
It is located between. And the rotating arm 34
has its base end spline engaged with the outer periphery of the camshaft 22, and the bolt 35 and nut 36
By tightening with the camshaft 22, it rotates together with the camshaft 22. Rotating arm 34
An interlocking rod 37 constituting an interlocking means is provided at the tip. The interlocking rod 37 extends in the left-right direction and connects the first and second brake levers 24, 2.
The front edges of these brake levers 24 and 25 are provided with recesses 38 and 39 in which the interlocking rod 37 engages in a removable manner. When the brake is not operated, the interlocking rod 37
It has entered the recesses 38 and 39.

Next, the operation of the above configuration will be explained with reference to FIG. 4.

When the driver performs a braking operation by grasping the regular brake lever 29 while driving, the first brake wire 26 is pulled, so the first brake arm 24 moves around the outer periphery of the camshaft 22 in the direction indicated by the arrow in FIG. It is rotated forward as shown in . Since the interlocking rod 37 supported by the rotating arm 34 is inserted into the recess 38 of the first brake arm 24, the interlocking rod 37 moves into the recess as the first brake arm 24 rotates. 38, and this interlocking rod 37 follows the first brake arm 24 and is pushed forward. As a result, the rotating arm 34 follows the first brake arm 24 and is rotated forward.

Therefore, the rotation of the first brake arm 24 is transmitted to the camshaft 22, and the brake shoe 20 is expanded via the cam 21, so that the lining portion 19 is pressed against the inner surface of the drum 13, and the drive shaft Braking force is applied to 5.

In this case, the second brake arm 25, which is rotated by the parking brake lever 30, is rotatable relative to the camshaft 22, so even if the camshaft 22 is rotated as described above, the second brake arm 25 is rotated by the parking brake lever 30. The motion is not transmitted to the second brake arm 25. Therefore, as shown in FIG. 4, the interlocking rod 37 is disengaged forward from the recess 39 of the second brake arm 25.

Therefore, even if the camshaft 22 is rotated by operating the regular brake lever 29, the second brake arm 25 connected to the parking brake lever 30 is held in the same position without rotating. Ru.

On the other hand, when the driver operates the parking brake lever 30, the second brake arm 25
The rotating arm 34 is rotated following this, and the drum brake 12 is activated. And in this case too,
The first brake arm 24 is connected to the camshaft 22
Therefore, even if the camshaft 22 is rotated by the second brake arm 25, this rotation will not be transmitted to the first brake arm 24. From this, the interlocking rod 37 is the first
The first brake arm 24 is detached forward from the recess 38 of the first brake arm 24, and the first brake arm 24 is held in the same position without rotating.

According to such a configuration, when either the regular brake lever 29 or the parking brake lever 30 is operated, the brake arm 2 on the operated side
4 or 25 engages with the interlocking rod 37, and the interlocking rod 37 separates from the brake arm 24 or 25 on the non-operating side. Therefore, on the non-operating side, the brake arm 24 or 25 and the rotating arm 34, as well as the camshaft 22, are completely separated, and it is possible to reliably prevent the two brake arms 24 and 25 from rotating together.

Therefore, even if a single drum brake 12 is made to have both the functions of a service brake and a parking brake, these brake operation systems for service and parking influence each other, that is, the service brake lever 29 If the parking brake lever 30 moves when the parking brake lever 30 is operated, the brake lever 30 will no longer be jarred, and the resistance will be reduced accordingly, allowing the brake to be operated smoothly.

Moreover, as described above, since the brake operating systems for regular use and parking do not affect each other, there is no possibility that the brake wire 26 or 27 on the non-operating side will be undesirably compressed. Therefore, buckling and sagging of the brake wires 26 and 27 can be prevented, and there is no need to provide any special play to prevent sagging.

Further, the interlocking rod 37 for rotating the camshaft 22 is attached to one of the brake arms 24 or 25.
When the brake arm 24 is rotated, the other brake arm 24
Or, since it separates from 25, brake arm 2
4 and 25 and the interlocking rod 37 are engaged only when the brake is operated, so that wear and deformation of the engaged portions are reduced. Moreover, the brake arm 24,
Since the interlocking rod 25 and the interlocking rod 37 simply come into contact with each other, there is an advantage over the conventional sliding structure that it is easier to manage the dimensions of the abutting portion and to perform maintenance and inspection.

Furthermore, according to the above configuration, in the event that some kind of abnormality occurs in the regular brake operation system, the parking brake can also be used as the regular brake.

Note that the present invention is not limited to the above embodiments.

For example, drum brakes are not limited to braking operations performed using the brake lever on the handlebar, but may also be performed by depressing a brake pedal provided near the footrest. In addition to wires, rods may also be used.

Further, in the above embodiment, the rotating arm is provided with an interlocking rod, but for example, each brake arm may be provided with an interlocking rod, and an engaging portion that engages with the interlocking rod may be provided on the rotating arm side.

Furthermore, in the above embodiment, the drum brakes on the rear wheels also function as a parking brake, but the drum brakes on the front wheels may also function as a parking brake.

Furthermore, the vehicle according to the present invention is not limited to a three-wheeled motor vehicle, but can be similarly applied to a two-wheeled motor vehicle or a four-wheeled motor vehicle.

[Effects of the Invention] According to the present invention described in detail above, when one brake arm is rotated, the rotation arm for rotating the camshaft separates from the other brake arm, so that the rotation arm of the camshaft is detached from the other brake arm. On the non-operating side,
The brake arm and rotation arm are completely separated,
It can reliably prevent the two brake arms from rotating together.

Therefore, even if a single drum brake is made to serve as both a service brake and a parking brake, the service and parking brake operating systems influence each other. If the parking brake operating element moves when operated, there will be no sway, and the resistance will be reduced accordingly, allowing the brake to be operated smoothly.

At the same time, there is no possibility that the connecting member that connects the non-operated brake operator and the brake arm will be undesirably compressed, so buckling or sagging of the connecting member can be prevented, and special There is no need to provide additional play.

Further, the interlocking means that transmits the rotation of the brake arm to the camshaft via the rotation arm is not always engaged with the brake arm, which reduces wear and deformation of this engagement portion. Furthermore, since the brake arm and the interlocking means are simply engaged and disengaged, there is an advantage that dimensional control and maintenance and inspection of the abutting portions are easier than with conventional sliding structures.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view of a tricycle, FIG. 2 is a sectional view showing a drum brake and its operating system, and FIG. 3 is a line taken along the line - in FIG. FIG. 4 is a cross-sectional view for explaining the operation of the drum brake. 2...Wheel (rear wheel), 12...Drum brake,
13...Drum, 20...Brake shoe, 22
...Camshaft, 24...First brake arm, 25...Second brake arm, 26...First connection member (first brake wire), 27
...Second connection member (second brake wire),
29, 30... Brake operator (service brake lever, parking brake lever), 34... Rotating arm, 37... Interlocking means (interlocking rod).

Claims (1)

[Claims] 1. In a vehicle in which wheels are braked by drum brakes, the drum brake is provided with a camshaft for rotating the brake shoe in a direction to press it against the inner surface of the drum, and on this camshaft, a first The brake arm and the second brake arm are each attached to be rotatable independently, and the first brake arm is connected to a regular brake operator via a first connecting member, and the second brake arm is connected to a regular brake operator. The child is connected to a parking brake operator via a second connecting member, and a rotating arm that rotates integrally with the camshaft is provided between the first and second brake arms, and Between these first and second brake arms and the rotating arm, when any one of the brake arms is operated to rotate, the rotating arm engages with the rotating arm so as to be able to come into contact with and separate from the rotating arm. A brake device for a vehicle, characterized in that it is provided with interlocking means for rotating the arm to follow the rotationally operated brake arm.