JPH05131905A - Manual brake device - Google Patents

Abstract

PURPOSE:To prevent the generation of an unpleasant crying abnormal sound when an elastic coil member and a wind up drum are put in turning movement relatively. CONSTITUTION:When a wind up drum 35 is inserted into an elastic coil member 40 a and restricted mutually by utilizing the operation which does not rotate in a wind up direction and can rotate in a loosing direction, as the elastic coil member 40a is divided into two and idle ends 45 of respective divided coil parts 40 are jointed each other, when the wind up drum 35 and the elastic coil member 40 are rotated relatively, the respective vibration in the idle end 45 side is denied each other and its action is stabilized and the crying abnormal sound caused by a stick phenomenon and the like is not generated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base fixed to a vehicle body so that a base portion of a brake lever is swingably supported, and a tip end portion thereof is extended to a vicinity of an operator, and a force is applied to the tip end portion. The present invention relates to a manual brake device and a squealing noise prevention device that apply braking by pushing and pulling a brake cable in accordance with swinging of a brake lever.

[0002]

2. Description of the Related Art An elastic coil is wound around an outer circumference of a winding drum, and when the fixed end on one end side is locked and the other end side is not locked and is a play side, the winding drum is rotated. Depending on the direction, there is a phenomenon that the elastic coil cannot be tightened and rotated in one direction, and the elastic coil is loosened and easily rotates when the winding drum rotates in the opposite direction. There has been proposed a manual brake device in which the brake lever is restrained in a braking state, and after braking, the idle side is pushed from the outside to loosen the elastic coil to release the braking.

As a general structure conventionally proposed in such a case, there is one as shown in FIG. That is, the elastic coil member 1 is wound so as to elastically contact the outer periphery of the winding drum 2, the fixed end 1a on one end side of the elastic coil member 1 is locked, and the other end side is not locked, and the winding drum 2 is locked. It is slightly extended in the tangential direction of the outer periphery of and is separated as it is to form a free end 1b. When the winding drum 2 is rotated in the A direction, the coil portion 1c of the elastic coil member 1 does not wind the winding drum 2 and cannot rotate, and in the opposite B direction, the winding drum 2 moves in the direction of the elastic coil member 1. When rotating relative to the coil portion 1c, the coil portion 1c is loosened and easily rotates.

In the case of a manual braking device, the winding drum 2 and the brake lever are made to interlock with each other, and the direction of rotation of the winding drum 2 when the brake lever is operated during braking is set to the direction of loosening the coil portion 1c. For example, the winding drum 2 can be easily rotated in the braking direction, and even after the braking, the winding drum 2 cannot rotate even if it tries to reversely rotate, and the braking state is maintained. And the coil part 1
If the free end 1b is pushed so as to loosen c, the coil portion 1c
Can no longer tighten the outer circumference of the winding drum 2 and can release the braking.

[0005]

However, in such a conventional technique, when the winding drum 2 is relatively rotated with respect to the elastic coil member 1 during the braking operation, the winding tightening is particularly remarkable. The outer periphery of the drum 2 and the coil portion 1c of the elastic coil member 1 slide, the slip phenomenon and the stick phenomenon become unstable, and a squealing noise is generated, which makes the user uncomfortable and impractical. There was a problem.

Although the cause of the squeaking noise is not always clear, the inventors of the present invention have analyzed the phenomenon of squeaking noise and found that the free end 1b of the elastic coil member 1 on the free end 1b side is wound. It was found that there is some cause of squeaking noise near the portion outside the outer periphery of the drum 2, and it was found that squeaking noise can be suppressed by changing the sliding phenomenon or the vibration phenomenon.

The present invention has been made by paying attention to the problems of the conventional technique and the analysis result, and when the elastic coil member and the winding drum relatively rotate, an unpleasant squeal is generated. It is an object of the present invention to provide a manual brake device and a structure for preventing squealing noise that does not generate abnormal noise and has improved practicality.

[0008]

SUMMARY OF THE INVENTION To achieve the above object, the gist of the present invention resides in that a base of a brake lever (20) is pivotably supported on a base (11) fixed to a vehicle body. A manual brake device (10) in which the tip portion is extended to the vicinity of the operator, a force is applied to the tip portion, and the brake cable (23) is pushed and pulled according to the swing of the brake lever (20) to apply braking. ),
A winding drum (35) having a gear (36) pivotally supported on the base (11) side and meshed with sector teeth (22a) provided at the base of the brake lever (20), and the winding drum (35). ) Is elastically wound around the outer periphery of the brake lever, the fixed end (42) on one end side is locked to the base (11), and the other end side is not locked and is on the free end (45) side. An elastic coil member (40a) having a winding direction so that the direction in which 20) returns from the braking state is the winding tightening direction.
And a release member (50) that pushes and loosens the free end (45) side of the elastic coil member (40a) to form a locking mechanism, and divide the elastic coil member (40a) in the coil axial direction into two parts. Each of the split coil portions (40) is configured by a coil portion (40), and one end side of each split coil portion (40) is a fixed end (42), while the other end side is a free end (45) side, and each free end (4
5) The manual braking device (10) is characterized in that it has a structure for preventing noises by connecting together.

[0009]

When the brake lever (20) is in the released state, the braking reaction force is not applied to the base portion of the brake lever (20) and the brake cable (23) is loose.
When the brake lever (20) is rotated about the base in this state, the brake cable (23) is pulled and braking is applied. When the brake lever (20) rotates, the gear teeth (36) are rotated by the sector teeth (22a) at the base of the brake lever (20), and the winding drum (35) responds to the swing of the brake lever (20). Rotate.

The elastic coil member (40a) cannot rotate because the fixed end (42) on one end side is locked to the base (11), and the winding drum (35) is elastic coil member (40).
Rotate relative to a). Since this rotating direction is the loosening direction of the elastic coil member (40a), it easily rotates. When the brake lever (20) is swung sufficiently, the brake cable (23) is squeezed and a braking force is generated. When the winding drum (35) and the elastic coil member (40a) rotate relative to each other, the two rotate partially in weak contact with each other.

At this time, the free ends (45) of the split coil portions (40) of the elastic coil member (40a) are separated from the outer circumference of the winding drum (35), and the split coil portions (40) are separated from each other. Since the free ends (45) of the two cancel each other out and stabilize the behavior of the free ends (45), the stick phenomenon is less likely to occur, or the split coil portions (4)
The occurrence of squeaking noise is suppressed due to the difference in natural frequency of 0).

When the application of force to the brake lever (20) is stopped, the braking lever (20) tries to recover due to the braking reaction force from the brake cable (23), but the direction of returning from the braking state is the winding drum (35) and the elastic coil member ( The rotation with 40a) becomes the winding tightening direction of the elastic coil member (40a), a strong resistance is generated, the brake lever (20) cannot return, and the braking state is maintained.

To release the restraint of the brake lever (20), the release member (50) of the locking mechanism is operated to operate the free ends (45) of the split coil portions (40) of the elastic coil member (40a). Press to loosen the elastic coil member (4
0a) cannot tighten the winding drum (35), and the winding drum (35) and the elastic coil member (40)
a) rotates relative to each other, the brake lever (20) returns to the non-braking state, and the brake cable (23) relaxes.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 6 show an embodiment of the present invention.

The manual brake device 10 is a foot-operated type, and a base portion 21 of a brake lever 20 is rotatably supported by a pivot shaft 20a on a base 11 having mounting brackets 12a and 12b fixed to a vehicle body.
A sector plate 22 centered on the pivot shaft 20a is fixed to the end edge of the base portion 21 of 0 by a caulking pin 22b, and a locking mechanism 30 that engages with the sector teeth 22a of the sector plate 22 to restrain the brake lever 20 is provided. It is provided.

A brake cable 23 for transmitting a braking force is connected to a base portion 21 of the brake lever 20 by a connecting bracket plate 23a, and a tip end portion of the brake lever 20 extends to a foot near the operator, and the operator at the forefront is the operator. A pedal 24 having a tread surface 24a facing the leg is fixedly installed. The brake lever 20 is biased counterclockwise in FIG. 1 by the biasing spring 25. When a force is applied to the tread surface 24a of the pedal 24, the brake lever 20 swings, and accordingly the brake cable 23 is pushed and pulled. It is designed to apply braking. In addition, a damper 26 is installed between the brake lever 20 and the base 11 to buffer a sudden return when the brake is released.

The locking mechanism 30 is composed of a winding drum 35 pivotally supported on the base 11 side, an elastic coil member 40 wound around the winding drum 35, and a release member 50. The winding drum 35 is pivotally supported on the base 11 by a pivot 31, and integrally has on one side a gear 36 that meshes with sector teeth 22a provided on the base 21 of the brake lever 20.

As shown in FIGS. 1 and 5, the elastic coil member 40a is provided with a noise preventing structure.

That is, the elastic coil member 40a is divided in the coil axial direction to form two split coil portions 40, 40.
It is composed by. Each of the split coil portions 40 is wound so that the main coil portion 41 is elastically contacted with the outer circumference of the winding drum 35, and the fixed end 42 on one end side is locked to the base 11.
3, the other end side is not locked, and the free end 45 is formed.
The brake lever 20 is wound around the winding drum 35 with the winding direction arranged so that the direction in which the brake lever 20 returns from the braking state is the winding direction.

The winding directions of both split coil portions 40 are opposite to each other, and the free ends 45 that are close to each other are connected to each other.
As shown in FIG. 6, the free ends 45, which are relatively spaced apart from each other, may be connected in the same winding direction.

As shown in FIG. 2, the retaining member 43 has the holding studs 43a, 43a implanted in the base 11, and the holding studs 43a, 43a are pressed with washers 43b, 43b.
And the holding nuts 43c and 43c are screwed onto the holding studs 43a and 43a, respectively. The fixed end 42 of each split coil portion 40 has a press washer 43b,
It is firmly fixed by being held in the holding groove between 43b.

A pushed end 47 for release operation is formed at a portion where the free ends 45 of the split coil portion 40 are connected to each other.

As shown in FIG. 4, the release member 50 is pivotally attached to the side surface of the base 11 by a pivot pin 51, and a pushing end 52 for pushing and loosening a pushed end 47 which is a free end 45 of the split coil portion 40. , And a connection end 53 to which a release operation member (not shown) is connected.

Next, the operation will be described.

When the brake lever 20 is rocked by depressing the pedal, the brake cable 23 is pulled down and a braking force is generated.

When the brake lever 20 is in the released state shown by the solid line in FIG. 3, the braking reaction force is not applied to the base portion 21 of the brake lever 20, and the brake cable 23 is loose. When the brake lever 20 is rotated around the pivot shaft 20a of the base 21 by stepping on the tread surface 24a of the pedal 24 from this state, the brake cable 23 is pulled and braking is applied. When the brake lever 20 rotates, the gear 36 is rotated by the sector teeth 22a of the sector plate 22 fixed to the base portion 21 of the brake lever 20, and the winding drum 35 is rotated.
Rotates according to the swing of the brake lever 20.

In the elastic coil member 40a, each split coil portion 40 cannot rotate because the fixed end 42 on one end side is locked to the base 11 by the locking member 43, and the winding drum 35 is split coil. Attempts to rotate relative to the section 40. This rotation direction is the loosening direction of the split coil portion 40, and the free end 45 at the end of the main coil portion 41 tries to displace in the direction of expanding the diameter of the main coil portion 41, so that the main coil portion 41 moves the winding drum 35. It cannot be tightened, loosens, and rotates easily.

When the brake lever 20 is swung sufficiently,
The connecting bracket plate 23a fixed to the base 21 is displaced,
The brake cable 23 is pulled and a braking force is generated. When the winding drum 35 and the elastic coil member 40a rotate relative to each other, the split coil portion 40 and the outer periphery of the winding drum 35 rotate while weakly slidingly contacting each other.

At this time, the free ends 45 of the respective split coil portions 40 cancel each other's vibrations and the behavior is stabilized, so that a single free end is separated from the outer circumference of the winding drum 35. The local stick phenomenon is unlikely to occur, or the occurrence of squeaking noise is suppressed due to a difference in natural frequency of each split coil unit 40 or the like.

That is, an unnatural sliding contact force or the like is not applied to the free end 45 of the main coil portion 41, the behavior of the free end 45 is stable, and the occurrence of abnormal noise is suppressed.

When the application of force to the pedal 24 of the brake lever 20 is stopped, the brake lever 20 tries to recover due to the braking reaction force from the brake cable 23 that pulls the base portion 21 to rotate it in the reverse direction. In the returning direction, the rotation of the winding drum 35 and the elastic coil member 40a becomes the winding direction of the elastic coil member 40a.

When the winding drum 35 tries to rotate relative to the elastic coil member 40a, the free end 45 at the end of the main coil portion 41 tends to displace in the direction of reducing the diameter of the main coil portion 41. The coil portion 41 winds up the winding drum 35, a strong resistance is generated, the brake lever 20 cannot return, and the braking state is maintained.

To release the restraint of the brake lever 20, the release member 50 of the locking mechanism 30 is operated to push the free end 45 of the split coil portion 40 with the pushing end 52, whereby the diameter of the main coil portion 41 is expanded. And loosen. The elastic coil member 40a cannot tighten the winding drum 35, and the winding drum 35 and the main coil portion 41 of the elastic coil member 40a can rotate relative to each other.

The gear 36 integral with the winding drum 35 is rotatable, the braking reaction force is applied to the brake cable 23, and the urging force of the urging spring 25 causes the brake lever 20 to return to the non-braking state. Then, the brake cable 23 relaxes. When the brake lever 20 returns, the damper 26
Suppresses sudden recovery so that no impact occurs.

In the above-mentioned embodiment, a foot-operated type manual brake device is shown, but a manual type brake device may be used, and the squeaking noise prevention structure is not limited to the manual brake device, but may be a mutually rotating winding. It can be widely applied to the combination of the tightening drum and the elastic coil member.

[0037]

According to the manual brake device of the present invention, the winding drum and the elastic coil member are fitted to each other, and by utilizing the action of not rotating in the winding direction and rotating in the loosening direction, When restraining each other, since the elastic coil member is divided into two and the free ends of the split coils are connected to each other, when the winding drum and the elastic coil member rotate relatively, A highly practical manual braking device that cancels out vibrations and stabilizes its behavior, does not generate squeaking noises due to stick phenomena, etc., suppresses the generation of unpleasant squeaking noises, and does not cause user discomfort. Can be provided.

[Brief description of drawings]

FIG. 1 is a plan view showing a mounted state of an elastic coil member in a manual brake device showing an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of the vicinity of a locking member that fixes a fixed end of an elastic coil member according to an embodiment of the present invention.

FIG. 3 is a front view of a manual brake device showing an embodiment of the present invention.

FIG. 4 is a manual brake device showing an embodiment of the present invention and is a view taken in the direction of arrow IV in FIG.

FIG. 5 is a plan view showing a mounted state of the elastic coil member in the manual brake device showing the embodiment of the present invention.

6 is a manual brake device showing an embodiment of the present invention, and is a view taken in the direction of arrow VI in FIG. 1. FIG.

FIG. 7 is a plan view showing a mounted state of an elastic coil member in a manual brake device according to another embodiment of the present invention.

FIG. 8 is an explanatory view showing a conventional technique and showing a relative relationship between a winding drum and an elastic coil member.

[Explanation of symbols]

 10 ... Manual braking device 11 ... Base 20 ... Brake lever 21 ... Base 22 ... Sector plate 22a ... Sector teeth 23 ... Brake cable 30 ... Locking mechanism 35 ... Winding drum 40a ... Elastic coil member 40 ... Split coil part 41 ... Main Coil part 42 ... Fixed end 43 ... Locking member 45 ... Free end 47 ... Pushed end 50 ... Release member

Claims (1)

[Claims] 1. A base portion of a brake lever pivotably supported on a base fixed to a vehicle body, a tip portion of the brake lever is extended to the vicinity of an operator, and a force is applied to the tip portion so that the brake lever swings. In a manual brake device for applying a brake by pushing and pulling a brake cable, a winding drum that is pivotally supported on the base side and that has a gear that meshes with sector teeth provided at the base of the brake lever,
It is wound so as to elastically contact the outer periphery of the winding drum, the fixed end on one end side is locked to the base, the other end side is a free end side without locking, and the direction in which the brake lever returns from the braking state is set. A locking mechanism is configured by an elastic coil member whose winding direction is arranged so as to be the winding tightening direction and a release member which pushes and loosens the free end side of the elastic coil member, and the elastic coil member is divided in the coil axial direction. It is composed of two split coil parts, one end side of each split coil part is a fixed end, the other end side is a free end side, and the squeaking noise prevention structure is formed by connecting each free end Manual braking device characterized by.