JPS6211695B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is suitable for trucks, mixer trucks, crane trucks, etc., and includes an air service brake and a parking brake.
The present invention relates to a brake system for an automobile that allows the air service brake to be used in conjunction with the parking brake when sufficient operating force is applied to the parking brake.

Conventionally, trucks, mixer trucks, crane trucks, etc. equipped with air service brakes have been used for vehicles parked on steeply sloping roads or steeply sloped surfaces. The parking brake is placed in the braked position for the purpose of work, and the air service brake is locked in the braked position by various means to ensure that the truck, mixer truck, crane vehicle, etc. is in the braked position. I have to.

However, if you consider the safety of using the air service brake in conjunction with the parking brake, it is important to consider the safety of using the air service brake in conjunction with the parking brake when the original purpose is to stop and park the truck, mixer truck, crane truck, etc. , sufficient operating force is applied, and then the parking
The air service brake is required to be in a braking state so that it can assist in braking, but the air service brake detects the stroke of the parking lever on the parking brake and
According to conventional means such as placing the service brake in the braking condition, if the parking lever is pulled up with a predetermined stroke, the air service brake is placed in the braking condition while the parking and parking lever is pulled up with a predetermined stroke. In parking brakes whose original purpose is to do so, sufficient operating force is not necessarily applied, and therefore it has been difficult to satisfy the above-mentioned requirements.

An object of the present invention is to apply sufficient operating force to the parking brake and use the air service brake in combination with the predetermined braking force applied to the parking brake to prevent the vehicle from stopping or parking. The purpose of the present invention is to provide an automobile brake system that ensures reliable braking conditions and increases safety.

Hereinafter, preferred specific examples of the automobile brake system of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show a specific example 10 of the brake system of the present invention applied to a mixer truck.

The brake system 10 is pivotally connected to an air service brake 11, a parking brake 16, and a cab floor 60 side, and
The air service brake 11 brake
A pedal hook 23 that locks the pedal 13 in a predetermined depression position, an air actuator 24 that is pivotally connected to the cab floor 60 side and drives the pedal hook 23, and a brake for the parking brake 16. - a valve casing 26 connected to the lever 19 and having an air inlet 29 and an air outlet 30, for opening and closing a valve port 32 formed in a valve bore 31 of the valve casing 26;
Poppet 3 located in the valve bore 31
3. The poppet return spring 34 is disposed in the valve bore 31, and the poppet return spring 34 is incorporated into the valve casing 26 and connected to the parking lever 17 side of the parking brake 16. A parking brake operating force detection valve 25 consisting of a valve driving element 37 that drives its poppet 33 when the brake operating force is exceeded, and its air service
A parking brake operating force detection valve 25 is provided on the outlet side of the brake valve 12 of the brake 11.
and an actuator control pipe 50 that connects the air outlet 30 of the parking brake operating force detection valve 25 to the air actuator 24.
and an exhaust type switching valve 51 provided on the actuator control piping 50.

The air service brake 11 is composed of independent front and rear service brake systems, and includes a pair of front and rear air tanks (not shown), a pair of front and rear relays, and a pair of front and rear air tanks (not shown). Valve (not shown)
It is a dual circuit type equipped with
Therefore, the brake valve 12 incorporated in the air service brake 11 is of a dual type.

Since the air service brake 11 is constructed in the same manner as the existing dual circuit type air service brake, a description of its construction will be omitted.

In the air service brake 11,
A brake pedal 13 attached to the brake valve 12 is configured to be locked at a predetermined depression position by a pedal hook 23 pivotally connected to the cab floor 60 side.

That is, the pedal hook 23 has its lower end pivotally connected to a bracket 46 fixed to the upper surface of the cab floor 60, and the lower end of the brake pedal 13 has a pedal
A pin 15 hooked onto the hook 23 is attached via a bracket 14.

The pedal hook 23 thus mounted is actuated by an air actuator 24.

The air actuator 24 is similar to existing actuators driven by compressed air, and one end, the cylinder side, pivots on a bracket (not shown) fixed to the top surface of the cab floor 60. connected, and the other end,
That is, the tip of the operating rod is pivotally connected to approximately the center of the pedal hook 23.

In addition, the parking brake 16 is
It is composed of a parking lever 17 attached to the upper surface of the floor 60 via a ratchet 20, a parking brake body 18, a connecting mechanism 22, etc., and one end of the connecting mechanism 22 is connected to the base side of the parking lever 17. and the other end is the parking brake operating force detection valve 2.
5, the parking brake body 18
The brake lever 19 is connected to the brake lever 19.

The parking brake operating force detection valve 2
5, as shown in FIG. 2, the valve casing 26, poppet 33, poppet return
It is composed of a spring 34 and a valve driving element 37.

That is, the valve casing 26 has a valve bore 31 formed at one end so that a poppet 33, a valve driving element 37, etc. can be incorporated therein, and a valve communicating with the valve bore 31 at the other end. It consists of a casing body 27 forming a driving element storage chamber 36 and a cover 28 bolted to the other end of the casing body 27 and having a hook hole 43.

An air inlet 29 and an air outlet 30 are formed at one end of the casing body 27, respectively.
The air inlet 29 and air outlet 30 are configured to be able to be communicated by the valve bore 31.

Further, bolt holes 41 and 42 are formed on the outer side of the casing body 27 at approximately the center thereof, respectively.

The casing body 27 configured in this way
A valve driving element 37 is installed in the valve driving element housing chamber 36 of the valve driving element.

The valve drive element 37 has a spring seat portion at one end and an operating rod 39 at the other end.
is integrally formed, and its operating rod 39
A ring-shaped poppet pressing portion 38 is formed at the base side.

The valve drive element 37 so formed is
Spring 4 set in the spring seat part
The casing body 27 is assembled into the valve driving element storage chamber 36 of the casing body 27 so that one end of the casing body 27 is in contact with the valve driving element storage chamber 36, and the other end of the casing body 27 is closed by fixing the cover 28 via bolts 44 and 45. be done.

Of course, the tip of the operating rod 39 of the valve drive element 37 projects outward from one end of the casing body 27, ie, from the valve bore 31.

A poppet 33 is installed in the valve bore 31 of the casing body 27, in which the valve drive element 37 is thus installed.

The poppet 33 is formed in the shape of a sleeve with a sealing surface on one side, and is passed through the operating rod 39 of the valve drive element 37 described above, and its sealing surface is connected to the valve port of the valve bore 31. 32 is installed in the valve bore 31 so that it can be opened and closed.

The poppet 33 is connected to the plug 3 by applying one end of the poppet return spring 34 to the back side of its sealing surface and pressing the other end of the poppet return spring 34.
5 into its valve bore 31 is configured to normally close its valve port 32.

The parking brake operating force detection valve 25 configured as described above has its casing body 2
At the bolt holes 41 and 42 of 7, the parking
It is rotatably supported on the brake lever 19 of the brake body 18 and also has a valve drive element 37 thereof.
The operating rod 39 is the parking brake 16
is connected to the other end of the connecting mechanism 22 at.

Of course, the brake lever 19 of the parking brake main body 18 is formed into a clevis type so that the parking brake operating force detection valve 25 can be rotatably supported on both sides.

Further, one end of a telesion spring 62 is attached to the hook hole 43 formed in the cover 28 of the parking brake operating force detection valve 25, and the other end of the spring 62 is attached to the transmission case. It is attached to a fixed bracket 61.

The air inlet 29 of the parking brake operating force detection valve 25 installed in this manner and the outlet side of the brake valve 12 described above are connected by a brake valve piping 47.

Of course, one end of the brake valve piping 47 and the brake valve 12 may be connected to either the front or rear outlet side of the brake valve 12, and when connected to the front outlet side, The other end of the brake valve piping 47 is connected to a front relay valve (not shown) via a connector 48, and when connected to the rear outlet side, the brake valve piping 47 is connected to the front relay valve (not shown) via a connector 48. The other end of the valve pipe 47 is similarly connected to a rear relay valve (not shown).

Further, the air outlet of the parking brake operating force detection valve 25 and the above-mentioned actuator 24 are connected by an actuator control pipe 50.

In addition, the actuator control piping 50 includes
An exhaust type switching valve 51 is installed, and the exhaust type switching valve 51 is mounted on an instrument panel (not shown) in the cab.
etc. will be incorporated into.

That is, the exhaust type switching valve 5
1 is the actuator control pipe 50 in normal state.
By blocking the compressed air sent into the interior and pulling the rib 52, the blocked compressed air is sent to the actuator 24 side.With the knob 52 pulled, the actuator When the pressure of the compressed air in the control pipe 50 is reduced to a certain level or less, it is configured to be automatically exhausted.

Also, on the upstream side of the exhaust type switching valve 51, the actuator control piping 5
0 is fitted with a pressure switch 53, one contact side of which is connected to a lamp 54 indicating that the brake pedal 13 is placed in a state in which it can be locked, and the other contact side is connected to a battery 56 via an electric circuit 55.

Further, the bracket 46 pivotally connecting the pedal hook 23 described above is biased by being connected to the pedal hook 23 when the brake pedal 13 is locked by the pedal hook 23. Push button type switch 63
One contact side of the push button switch 63 is connected to the lamp 59 which indicates that the brake pedal 13 is in the locked state, and the other contact side connects the electric circuit 64. It is connected to the battery 56 side through.

Of course, the electrical circuits 55 and 64 incorporate fuses 57 and 58.

Next, the locking operation of the brake pedal 13 in the automobile brake system 10 of the present invention will be explained.

First, the brake pedal 13 is depressed to place the air service brake 11 in a braking state.

Next, when the parking lever 17 is pulled up, the brake lever 19 is pulled through the coupling mechanism 22 and the parking brake operating force detection valve 25.

In this way, when the parking lever 19 is pulled and the operating force reaches a predetermined force, only the valve driving element 37 of the parking brake operating force detection valve 25 is pulled out slightly, and therefore its poppet is Portion 38 is moved up poppet 33 against poppet return spring 34 to separate the sealing surface of poppet 33 from valve port 32 and to bring air inlet 29 and air outlet 30 into communication.

That is, the setting spring 4 incorporated in the parking brake operating force detection valve 25
0 is set so that it can deform when the operating force applied to the parking brake 16 reaches a predetermined force, and therefore, when the predetermined operating force is not applied to the parking brake 16, , its air inlet 29 and air outlet 30 cannot be communicated.

Thus, when the air inlet 29 and the air outlet 30 are in communication, the brake valve 1
Compressed air sent from the 2 side is sent to the exhaust type switching valve 51 side.

At this time, the pressure switch 53 is energized and the lamp 54 lights up, indicating that a predetermined operating force is being applied to the parking brake 16 and that the brake pedal 13 is in a state where it can be locked. Recognized.

After confirming that the lamp 54 is lit,
Pull the knob 52 of the exhaust type switching valve 51.

When its nozzle 52 is pulled, compressed air is sent into the actuator 24 via the actuator control line 50, thus rotating the pedal hook 23 towards the brake pedal 13, in such a state that When you take your foot off the brake pedal 13, the pin 15 attached to the back of the brake pedal 13 is hooked to the tip of the pedal hook 23, and the brake pedal 13 is connected to the air service brake 11. is locked to maintain the braking condition.

Further, in order to release the lock of the brake pedal 13, the parking lever 17 is simply pushed down.

That is, by pushing down the parking lever 17, the operating force applied to the parking brake 16 gradually becomes smaller, and when the force becomes less than a predetermined operating force, the parking brake is activated.
The setting spring 40 of the brake force sensing valve 25 returns the valve actuating element 37 to its original state, so that the poppet 33 closes the valve port 32 by means of the poppet return spring 34.

In this manner, when the valve port 32 is closed, the compressed air upstream of the exhaust-type switching valve 51 in the actuator control piping 50 is transferred from the air outlet 30 of the parking brake operating force detection valve 25 to the poppet. 3
3 and the operating rod 39 of the valve drive element 37.

Furthermore, when the pressure of the compressed air on the downstream side of the exhaust type switching valve 51 is reduced in the actuator control piping 50, the compressed air is automatically exhausted by the exhaust type switching valve 51, and the actuator Return spring incorporated within 24 (not shown)
As a result, the pedal hook 23 is disengaged from the pin 15 of the brake pedal 13, and the brake pedal 23 is unlocked.

Brake system 10 for an automobile according to the invention described above
In order to properly operate the parking brake operating force detection valve 25 when a predetermined operating force is applied to the parking brake 16, adjustment is made by changing the spring constant of the setting spring 40. It is determined by considering vehicle weight, rear axle ratio, etc., but for example, if a braking force of 0.16g or more is required,
It is desirable to set the operating force to approximately 35 kg.

According to the present invention having the above configuration, when sufficient operating force is applied to the parking brake and a predetermined braking force is applied by the parking brake, the air service brake is also used, A braking system for an automobile that ensures braking conditions during stopping and parking and enhances safety can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a specific example of a brake system for an automobile according to the present invention, and FIG. 2 is a sectional view of a parking brake operating force detection valve. 10... Brake system of automobile, 11... Air service brake, 12... Brake valve, 13... Brake pedal, 16... Parking brake, 18... Parking brake body, 19... Brake・Lever, 23... Pedal hook, 24... Air actuator,
25... Parking brake operating force detection valve, 26... Valve casing, 29... Air inlet, 30... Air outlet, 31... Valve bore, 32... Valve port, 33... Poppet, 34 ...Poppet Return Spring,
37... Valve driving element, 47... Brake/valve piping, 50... Actuator control piping, 5
1...Exhaust type switching valve.

Claims (1)

[Scope of Claims] 1. An air service brake, a parking brake, which is pivotally connected to the vehicle body side, and whose air service brake is
A pedal hook that locks the brake pedal of the service brake in a predetermined depression position, an air actuator that is pivotally connected to the vehicle body side and drives the pedal hook, and a brake lever of the parking brake. a valve casing connected to the side and having an air inlet and an air outlet; a poppet disposed in the valve bore to open and close a valve port formed in the valve bore of the valve casing; A poppet return spring disposed in the valve bore, incorporated in the valve casing, and connected to the parking lever side of the parking brake, with a predetermined parking brake operating force or more,
A parking brake operating force detection valve consisting of a valve driving element that drives the poppet, and a brake valve that connects the air inlet of the parking brake operating force detection valve to the outlet side of the brake valve of the air service brake. A brake system for an automobile including piping, an actuator control piping that connects the air outlet of the parking brake operating force detection valve to the air actuator, and an exhaust type switching valve provided in the actuator control piping.