JP3416683B2 - Side brake mechanism - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a side brake mechanism for an automobile which alleviates a large torque accompanied by an impact caused by a sudden side brake operation.

[0002]

2. Description of the Related Art In addition to normally used brakes (so-called foot brakes), automobiles are equipped with side brakes that are operated by a driver pulling a cable by hand during parking or emergency braking.

FIG. 7 is an exploded view showing an example of such an automobile side brake mechanism. In the figure, 1 is a brake drum connected to an axle 7, 2 is a brake shoe, 3 is a support plate for supporting the brake shoe 2, 4 is a housing on the axle side adjacent to the brake, and 5 is connected to the brake shoe 2. 6 is a cable for operating a brake shoe connected to a brake lever (not shown) in the cab, and 8 is a bolt for fixing the assembly of the brake shoe 2 and the support plate 3 to the housing 4. is there.

In an automobile equipped with the side brake mechanism as described above, the cable 6 of the side brake mechanism is pulled from the driver's cab during driving of the vehicle or during emergency braking such as malfunction of the foot brake which is constantly used. This allows
The brake shoe 2 is pressed against the inner circumference of the brake drum 1 via the operating lever 5, and the rotation of the axle 7 is braked.

[0005]

In the above-mentioned side brake mechanism, the cable 6 is suddenly pulled during emergency braking,
When the brake shoe 2 is brought into pressure contact with the brake drum 1 to brake the axle 7, a torsional force due to a large braking torque accompanied by this impact acts on the housing 4 via the support plate 3 and the bolt 8 to normally form an aluminum alloy casting ( Or housing 4 made by die casting)
May be destroyed starting from the bolt hole 4a. This problem is exacerbated especially by pulling the side brakes while driving.

An object of the present invention is to alleviate a large torque accompanied by an impact caused by a sudden side brake operation in a side brake mechanism of an automobile, and to reliably detect such a large torque operation to reduce or alleviate the large torque. Is to prevent the side brake from being damaged.

[0007]

SUMMARY OF THE INVENTION According to the present invention, in a side brake mechanism, a support member for supporting an actuating mechanism including a brake shoe is provided, and a cushion having an elastic body such as a spring is provided between the support member and the vehicle body. The gist of the present invention is that a shock-absorbing mechanism is provided so as to buffer the impact torque, and as a concrete means thereof, according to the invention of claim 1, a brake drive that rotates in conjunction with an axle is provided. in the produced side brake mechanism to more braking to the brake shoe over which is connected via a cable to the operating lever of the arm from the cab, the brake shoe and the actuating lever
A support member for supporting the brake shoe.
-Because of the impact when braking the axle by pressing it against the
Due to the twisting force caused by the
A support member in a relatively displaceably supported in direction, the housings
A stopper support fixed by bolts to the ring, and the stopper member projecting from the support member side to the stopper support, a pair of resilient members attached to said support member
A pair of elastic members of the buffering mechanism comprising comprising buffering mechanism and the
The receiving surface of the
So as to face each other in the tangential direction of the circumferential direction that is relatively displaced between
The damping mechanism is arranged on the support member to brake the axle.
The housing side of the axle is twisted due to the torsional force caused by the impact
When relative displacement occurs in the support member in the circumferential direction between the
The contact surface of the elastic member abuts on the stopper member.
A cushioning action is created to alleviate the torsional force caused by the impact.
It is characterized that you have configured to so that.

The invention according to claim 2 is the same as claim 1
In addition to the described invention, from the support member to the housing
A load detector for detecting the load transmitted to the vehicle body side where the load is fixed, a load comparator for calculating a load deviation between the detected load detected by the load detector and a set allowable load, and the load An alarm transmitter that inputs a load deviation from the comparator and issues an alarm when the detected load exceeds the allowable load.

Furthermore the invention of claim 3, wherein, in addition to the invention of claim 1, wherein from said support member Haujin
A load detector that detects the load transmitted to the vehicle body side where the gear is fixed , and a load comparator that calculates a load deviation between the detected load detected by the load detector and the set allowable load,
Load deviation from該荷heavy comparator is input, when said detected load exceeds the allowable load, that and a brake control device that outputs an operation signal of the service brake in the service brake drive mechanism for driving the service brake In
It

Further, if the present invention is applied to a drum type center brake, which is liable to malfunction when the side brake mechanism is operated unreasonably, a higher effect can be obtained.

[0011]

Since DETAILED DESCRIPTION OF THE INVENTION The present invention is constructed as described above, prior to
The axle is driven by the torsional force caused by the shock when braking the axle.
Displacement relative to the support member in the circumferential direction between the housing on the side
In the event of occurrence of a
Slow contact with a member to alleviate the torsional force caused by the impact
It was constructed so that an impulse action occurs. The torsional force due to the large torque accompanied by the shock generated when the side brake is suddenly actuated during emergency braking is transmitted to the cushioning mechanism arranged in the support member, and the cushioning mechanism receives the one elastic member.
Twisting force caused by the impact when the surface contacts the stopper member
Is transmitted to the vehicle body side.

As a result, an excessive impact force does not act on the housing of the side brake, and damage to the housing is prevented.

According to the second aspect of the invention,
Transmission from the support member to the vehicle body side where the housing is fixed
With a load detector that detects the load that is
Load deviation between the detected load detected and the allowable load set
And a load deviation from the load comparator
Is input and an alarm occurs when the detected load exceeds the allowable load.
Since the alarm transmitter for transmitting the alarm is provided , the driver can promptly detect an unreasonable braking operation by issuing an alarm when the detected load exceeds the allowable load. Therefore, it is possible to prevent the occurrence of a failure. The allowable load in the invention of the present application indicates a numerical value set in advance to prevent the load in consideration of the strength of each member of the side brake mechanism.

According further to the invention of claim 3, wherein
Transmission from the support member to the vehicle body side where the housing is fixed
With a load detector that detects the load that is
Load deviation between the detected load detected and the allowable load set
And a load deviation from the load comparator
Is input and the detected load exceeds the allowable load, the
Service brake drive mechanism that drives the service brake
Brake control device that outputs the service brake operation signal
Because of a location, it becomes possible to service brake when the load detected exceeds the allowable load is actuated, adjacent to the brake
Excessive impact force on the axle side housing
And the occurrence of damage to the housing is prevented.

[0015]

Embodiments of the present invention will be described in detail below with reference to FIGS. However, the dimensions, materials, shapes, relative positions, etc., of the components described in this embodiment are not intended to limit the scope of the present invention thereto, unless there is a specific description, and are merely illustrative examples. Nothing more than.

FIG. 1 is an exploded schematic view of an automobile side brake mechanism according to an embodiment of the present invention, FIG. 2 is a sectional view taken along the axle center line of the side brake, and FIG. 3 is a sectional view taken along line AA of FIG. 4 shows the B arrow view of FIG.

In FIGS. 1 to 4, 7 is an axle, 1 is a brake drum fixed to the axle 7 and rotating therewith, 2
Is a pair of brake shoes, 5 is an operating lever connected to the brake shoe, 6 is a cable having one end connected to the operating lever 5 and the other end connected to a brake lever (not shown) in the cab. is there.

Numeral 19 is a stopper support, which is formed in an annular shape and is fixed to the housing by four bolts 20, and a plurality of stopper supports are provided at equal intervals in the circumferential direction toward the brake shoe 2 side (in this embodiment, 4 Individual stoppers 18 are provided.

Reference numeral 16 is a support member formed in an annular shape,
Braking members such as the brake shoe 2 and the operating lever 5 are attached, and a buffer mechanism 10 abutting against the stopper 18 is provided on the inner peripheral side of these braking members.
The same number is provided.

Further, the load cell 3 is provided at a plurality of locations (two locations in this embodiment) in the circumferential direction on the outer periphery of the support member 16.
The zero detection member 17 is fixed.

The load cell 30 or load detector is shown in FIG.
As shown in FIG. 3, the detection member 17 of the support member 16 is disposed between the pair of outer detection members 31 and 31 having the piezoelectric element 32 fixed to the surface fixed to the housing 4 at an interval u. The piezoelectric element 32 detects the force acting between the brake shoe 2 side, that is, the support member 16 side and the housing 4 side when the braking torque is activated.

As shown in FIG. 3, the buffer mechanism 10 comprises a spring box 12 fixed to the support member 16, a spring 11 housed in the spring box, a retainer 13, an adjusting screw 14, and the like. The spring 11 is provided with a constant preset load by the adjusting screw 14.

The buffer mechanism 10 is provided so that the stopper 18 on the vehicle body side is positioned between the retainers 13 with a small fixed gap S, and a large torque due to the braking torque is applied to the brake shoe 2 side. When it acts on the support member 16, the gap S disappears, the retainer 13 and the stopper come into contact with each other, and the spring 11 described later has a buffering action by bending.

FIG. 5 shows the above load detector or load cell 3.
The block diagram of the alarm and brake control system in which the detection signal of the braking load from 0 is input is shown, and 42 is the allowable value FO of the braking load ( each part of the side brake mechanism).
Considering the strength of the material, it is set in advance to prevent damage.
Load value set with a numerical value ), 41 is an allowable value FO
And a load comparator for calculating a deviation ΔF (= F0-F) between the detected load F and 43, where the load is F> F0 (that is, ΔF <0 ).
When the alarm becomes, an alarm transmitter that issues an alarm, 45 is F> F
It is a brake control device that sends a service brake actuation signal to the drive mechanism 46 of the service brake 47 when it becomes O.

When the vehicle is equipped with the side brake constructed as described above, when the driver temporarily operates the side brake, the operating force of the driver passes through the cable 6 and the operating lever 5 and the brake shoe. 2, the brake shoe 2 and the brake drum 1 are pressed against each other, and the axle 7 is braked.

The large torque with shock generated at that time is
The brake shoe 2 is transmitted to a supporting member 16 attached thereto, which becomes a tangential force in the circumferential direction and is transmitted to the spring 11 via the spring box 12 and the adjusting screw 14 of the buffer mechanism 10, and further, the retainer 13 and the stopper 1.
When the tangential force exceeds the preset load of the spring 11, the spring 11 bends, and this bending absorbs and alleviates the impact.

As a result, no excessive impact force acts on the housing 4 on the axle side, and damage to the housing 4 is prevented.

In this case, since a fixed preset load is applied to the spring 11 and the spring 11 is housed in the spring box 12, the spring 11 is supported by the cushion mechanism 10 so as to be free to move in the circumferential direction on the vehicle body side. The member 16 is stably supported on the vehicle body side by the preset load.

Next, the operation of the alarm device and the service brake actuating device will be described based on the block diagram shown in FIG. 5 and the flow chart shown in FIG. 6 showing the flow from the load detection to the actuation of the service brake. The large torque is transmitted via the supporting member 16 to the detecting member 17 of the load cell (load detector) 30 fixed to the outer periphery of the supporting member 16 as a tangential force. This tangential force is detected by the piezoelectric element 32 attached to the outer detection members 31, 31 fixed to the housing 4 and sandwiching the detection member 17.

The tangential force detected by the load detector 30, that is, the load F is input to the load comparator 41.該荷from the load setter 42 in the heavy comparator 41, the parking brake mechanism
A permissible load F0 preset in order to prevent breakage in consideration of the strength of each member is input.

The load comparator 41 calculates and outputs the deviation .DELTA.F = FO-F between the load setting value F0 and the load detection value F.

When the deviation ΔF is negative, that is, when the detected load F exceeds the set load F0, the alarm transmitter 43 sends an alarm to the alarm device 44 to notify the driver.

At the same time, when the deviation Δ F is negative, that is, the detected load F exceeds the set load F ₀ , the brake control device 45 receives this and outputs an operation signal of the service brake 47 to the brake drive mechanism, and the service brake 47. Performs braking action.

By operating the service brake, it is possible to prevent occurrence of a failure due to excessive torque of the side brake.

[0035]

According to the present invention, when the side brake is suddenly actuated and a large torque is generated due to an impact, the impact force due to the large torque is applied to the buffer mechanism via the support member supporting the control member. The impact is softened.

As a result, an excessive impact force does not act on the housing on the vehicle body side unlike the conventional one, the damage of the housing can be prevented, and the durability of the entire side brake and its supporting portion can be prevented. The property is improved.

A pair of the cushioning mechanism according to claim 1.
By applying a preset load to each elastic member of
The effect of the present invention can be achieved more preferably.

According to the invention of claim 2, the load detector promptly detects an excessive load generated on the support portion of the brake by the above-mentioned emergency braking or an unreasonable braking operation, and issues an alarm. It is possible to prevent the occurrence of a failure due to the emergency braking or the excessive braking operation.

According to the third aspect of the present invention, when the load detector detects an excessive load, the service brake is activated to reduce the excessive load applied to the side brake, thereby preventing the side brake from being broken. It can be avoided.

[Brief description of drawings]

FIG. 1 is an exploded schematic view of an automobile side brake according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the axle center line of the side brake in the above embodiment.

FIG. 3 is a view on arrow AA of FIG.

FIG. 4 is a view on arrow B of FIG.

FIG. 5 is a block diagram of an alarm device and a service brake actuating device in the above embodiment.

FIG. 6 is a flowchart showing a flow from load detection to service brake operation in the above embodiment.

FIG. 7 is an exploded schematic view of a conventional automobile side brake.

[Explanation of symbols]

1 brake drum 2 brake shoes 4 housing 6 cables 7 axles 10 Buffer mechanism 11 spring 12 spring boxes 16 Support member 17 Detection member 18 stopper 19 Stopper support member 30 load cell (load detector) 31 Outside detection member 32 Piezoelectric element 41 load comparator 43 Alarm transmitter 45 Brake control device 47 Service brake

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Claims (3)

(57) [Claims] 1. A brake drive that rotates in conjunction with an axle.
TheOn the cable from the cabVia the actuating leverConnected
Brake shoeToA service configured to brake more
In the id brake mechanism,Support member for supporting the brake shoe and the operating lever
And press the brake shoe against the brake drum.
Due to the torsional force caused by the shock when braking the axle
Circumferentially between the housing on the axle side Relative displacement possible
A supported support member, The abovehousingStopper support fixed by bolts to
Body and On the stopper supportOn the support member sideThe protruding stopper
Wood andComprised of a pair of elastic members attached to the support member
A buffer mechanism, Equipped with The receiving surfaces of the pair of elastic members of the buffer mechanism are stopper parts.
Circumference of relative displacement between the material and the housing at a minute distance
The cushioning mechanism supports the supporting portion so that they face each other in a tangential direction.
Placed on the wood, The vehicle is driven by a torsional force caused by an impact when braking the axle.
Relative displacement in the circumferential direction of the support member between the housing on the shaft side
If the bearing surface of the first elastic member is
Abut on the member to reduce the twisting force caused by the impact.
Configured to create a cushioning effect Rhino characterized by
Brake mechanism. 2. The housing is fixed to the supporting member.
Load detector for detecting the load transmitted to the vehicle body, the load comparator for calculating the load deviation between the detected load detected by the load detector and the set allowable load, and the load comparator The side brake mechanism according to claim 1, further comprising: an alarm transmitter that outputs a warning when the detected load exceeds an allowable load when a load deviation from is input. 3. The housing is fixed to the supporting member.
Load detector for detecting the load transmitted to the vehicle body, the load comparator for calculating a load deviation between the detected load detected by the load detector and the set allowable load, and the load comparator And a brake control device that outputs a service brake actuation signal to a service brake drive mechanism that drives the service brake when the detected load exceeds the allowable load. The side brake mechanism according to claim 1.