JPH0558538U - Emergency braking device - Google Patents

Abstract

(57) [Summary] [Purpose] When the service brake of a vehicle fails,
To ensure that the emergency brake can be activated in the passenger compartment and to use a nylon tube for the air line of the service brake to prevent rust and reduce weight. [Structure] In an air-over-hydraulic brake, an emergency air line 22 connected from an emergency air tank 21 to a double check valve 6 of a rear wheel air master 5
Is provided with a 3-way magnet valve 25, and the 3-way magnet valve 25 can be opened by operating the switch 27 in the vehicle compartment when the air pressure in the service air tank 2 and the service air line 7 decreases.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to an emergency brake device for backing up a service brake of a truck or the like when the service brake fails.

[0002]

[Prior Art]

 The air-over-hydraulic service brakes of conventional vehicles often have steel air ducts, but if this is replaced with nylon tubing, rust resistance, weight reduction, and the ability to bundle and pipe them together are excellent. Advantages such as assembly workability can be obtained. However, nylon tubes have the drawback of being vulnerable to heat, and there was some hesitation in their adoption as an important safety component called a regular break.

[0003]

[Problems to be solved by the device]

 The present invention intends to easily realize the use of a nylon tube in the air line of the service brake by using the emergency brake device together.

[0004]

[Means for Solving the Problems]

 For this reason, the emergency braking device according to the present invention is provided in the emergency air tank provided separately from the service air tank, the emergency air line connected from the emergency air tank to the air master, and the emergency air line. It also has an opening / closing valve and a switch provided in the cab for operating the opening / closing valve.

Further, the emergency braking device according to the present invention includes an emergency air tank provided separately from the regular air tank, an emergency air pipeline connected from the emergency air tank to the air master, and an emergency air pipeline. It has an on-off valve provided and a regular air pressure drop detection mechanism for the regular air line connected to the air master from the regular air tank. When the above detection mechanism detects the regular air pressure drop, the on-off valve opens. It is configured to be done.

Further, the emergency braking device according to the present invention includes an emergency air tank provided separately from the regular air tank, an emergency air line connected to the emergency air tank and the air master, and an emergency air line. It has an open / close valve that is opened at the same time as the starter switch is closed.

[0007]

[Action]

 Therefore, even if the air pressure is released from the air line of the service air tank or service brake for some reason, it is possible to operate the switch provided in the cab or by the detection mechanism provided in the service air line. The emergency brake can be activated by opening the open / close valve in the emergency air pipeline and supplying the emergency air from the emergency air tank through the open / close valve to the air master.

On the other hand, the on-off valve in the emergency air line is opened in conjunction with the closing of the starter switch, and is closed until then, and the emergency air pressure is not supplied to the air master. Even if the vehicle is parked for a certain period, as long as the starter switch is open, the emergency brake will not be actuated without fail. There is no such problem as continuing.

[0009]

【Example】

 Hereinafter, embodiments of the present invention shown in the drawings will be specifically described. In the air-over-hydraulic all-wheel braking system for a truck shown in FIG. 1, a regular air pipeline 4 made of nylon tube for connecting a regular air tank 2 accumulated by the pump 1 and an air master 3 for the front wheel, and a regular air tank 2 A dual brake valve 9 operated by a brake pedal 8 is installed in a nylon tube service air line 7 that connects the rear wheel air master 5 via a double check valve 6, and a service upstream of the brake valve 9 is also used. The working air conduit 10 branched from the air conduit 4 is connected to the front wheel air master 3, and the working air conduit 11 branched from the regular air conduit 7 upstream of the brake valve 9 passes through the double check valve 12 for the rear wheels. Connected to Air Master 5.

On the other hand, the emergency air tank 21 accumulated from the regular air tank 2 through the check valve 20 has a decompression valve 23, a decompression valve 24, a three-way magnet valve 25 and a double check sequentially through a steel emergency air conduit 22. The rear wheel air master 5 is connected to the rear wheel air master 5 via the valve 6, and the operation air pipeline 26 branched from the emergency air pipeline 22 between the pressure reducing valves 23 and 24 passes through the double check valve 12 to the rear wheel air master 5. It is connected to the. A switch 27 installed facing the passenger seat in the cab is connected to the 3-way magnet valve 25.

In the above device, when the brake pedal 8 is constantly depressed, the dual brake valve 9 opens, and the instruction air pressure is first applied to the rear wheel air master 5 from the regular air tank 2 through the regular air pipe lines 4 and 7. Since the command air pressure is sent to the air master 3 for the front wheels, the working air is first sent to the air master 5 for the rear wheels by the working air conduit 11 to transmit the brake oil pressure to the rear wheels (not shown). The working air is sent to the front wheel air master 3 through the pipeline 10, the brake hydraulic pressure is transmitted to the front wheels (not shown), and the brakes are applied to all the wheels.

However, if for some reason the service air tank 2 and the service air pipe 7 upstream of the dual brake valve 9 fall below a certain pressure, an alarm lamp (not shown) or a buzzer will be activated. Even if 8 is stepped on, the normal command air pressure and operating air pressure are not supplied to the front and rear wheel air masters 3 and 5.

However, when the occupant operates the switch 27 to open the 3-way magnet valve 25, the instruction air adjusted to an appropriate pressure by the decompression valves 23 and 24 from the emergency air tank 21 passes through the pipe line 22 and doubles. At the same time as being sent to the rear wheel air master 5 via the check valve 6, the operating air pipe 26 operates from the air pressure reducing valve 23, 24 between the air pipe 22 and the double check valve 12 to the rear wheel air master 5. Since air is sent, a brake hydraulic pressure having an appropriate strength is transmitted to a brake mechanism (not shown) of the rear wheels to apply an emergency brake to the rear wheels.

That is, even if a failure occurs in the service brake system, the emergency brake can be applied to the truck by operating the switch 27 in the cab, so that the safety of the vehicle can be easily increased. Therefore, it is possible to use the nylon tube air pipelines 4 and 7 for the piping of the regular brake system without anxiety, and obtain benefits such as rust prevention, weight reduction, and improvement in assembly workability.

Note that the 3-way magnet valve 25 can be replaced with an air valve that operates by air pressure, and the above-mentioned valves can be opened in a multistage or stepless manner by operating a switch in the cab to prevent an emergency in the truck. The braking force can be adjusted appropriately. Further, the emergency braking mechanism for the rear wheels can be provided alongside the front wheels to increase the emergency braking force of the vehicle.

In the other embodiment shown in FIG. 2, the same reference numerals are given to the same parts as the above-mentioned embodiment, and the parts different from the above-mentioned embodiments will be mainly described. In this emergency brake device, a stop lamp switch 31 for turning on / off the stop lamp 30 is provided in the regular air pipe 7 downstream of the dual brake valve 9, and the stop lamp switch 31 is turned on / off in response to opening / closing. A relay 32 and a pedal switch 33 that closes when the brake pedal 8 is depressed are connected in series to the 3-way magnet valve 25.

Therefore, when the service air tank 2 and the service air pipe 7 upstream of the dual brake valve 9 drop below a certain pressure for some reason, even if the brake pedal 8 is depressed, the service air pipe 7 is removed from the service air pipe 7. Since the normal command air pressure is not supplied to the rear wheel air master 5, the stop lamp switch 31 is opened and the relay 32 is closed, while the pedal switch 33 is closed, so the 3-way magnet valve 25 is opened. As in the case of the above-described embodiment, the instruction air of appropriate pressure is sent from the emergency air tank 21 to the rear wheel air master 5 through the emergency air pipeline 22 and the double check valve 6, and at the same time, the working air pipeline 26 is provided. Since the working air is sent to the rear wheel air master 5 through the double check valve 12 and the double check valve 12, the rear wheel not shown Braking oil pressure of appropriate strength is transmitted to the rake mechanism to apply an emergency brake to the rear wheels.

That is, in this embodiment, if the brake pedal 8 is depressed even when a failure occurs in the service brake system, the emergency brake can automatically operate in place of the service brake. The safety can be further enhanced. In place of the stop lamp switch 31, a pressure switch is separately provided to detect when the inside of the regular air pipe 7 downstream of the dual brake valve 9 drops below a certain pressure, and is linked to the pressure drop. Needless to say, the valve in the emergency air line 22 may be opened.

Further, in the embodiment shown in FIG. 3, the same reference numerals are given to the same portions as those of the above-mentioned embodiment, and the portions different from the above-mentioned respective embodiments will be described below. In this emergency brake device, a differential pressure valve 40 is installed in the emergency air line 22 between the pressure reducing valves 23 and 24, and the normal air line 7 upstream of the dual brake valve 9 is connected to the differential pressure valve 40. The emergency air line 22 connected to the differential pressure valve 40 is normally closed and the downstream side is opened to the atmosphere, and when the air pressure in the normal air line 7 decreases, the emergency air line 22 is closed. 22 is connected to the upstream and downstream. The starter switch 41 of the vehicle is connected to the 3-way magnet valve 25.

Therefore, when the air pressure of the regular air tank 2 is released due to parking for a long time, etc., the air pressure is sent from the emergency air tank 21 to the emergency air pipeline 22 by the operation of the differential pressure valve 40. As long as the starter switch 41 of the vehicle is off, the 3-way magnet valve 25 is closed, so the command air pressure is sent from the emergency air line 22 to the rear wheel air master 5 via the double check valve 6. Therefore, the brake hydraulic pressure is not automatically transmitted to the brake mechanism (not shown) of the rear wheels, and the emergency braking is not applied to the rear wheels.

That is, even if the service brake system fails during parking, the emergency brake is not wastefully applied, and it is possible to reliably prevent a high hydraulic pressure from being applied to the brake hydraulic equipment and hydraulic piping for a long time. Therefore, the reliability of these safety components is not impaired, and the safety of the vehicle can be improved. Further, as long as the starter switch 41 is closed, the 3-way magnet valve 25 is opened, so that the emergency air tank 21, the emergency air line 22 and the like can be smoothly backed up in case of failure of the regular brake system, and the emergency brake can be performed. Can be activated. Needless to say, the emergency braking device may be configured by appropriately combining the above-described embodiments.

[0022]

[Effect of the device]

 The emergency braking device according to the present invention opens the opening / closing valve in the emergency air pipeline to open the emergency air from the emergency air tank to the air master even when the air pressure is released from the regular air tank or the regular air pipeline for some reason. Since it can be supplied and the emergency brake can be operated accurately to enhance the safety of the vehicle easily, use a nylon tube for the regular air pipeline to prevent corrosion and reduce the weight of the regular air pipeline. In addition, the open / close valve in the emergency air line is opened in conjunction with the closing of the starter switch, so even if the vehicle is parked for a long period of time, the abnormal brake will operate as long as the starter switch is open. It is possible to prevent the malfunction of the brake hydraulic equipment, etc. from taking a long time due to high hydraulic pressure, and prevent the safety performance of each part from deteriorating. It can be.

[Brief description of drawings]

FIG. 1 is a layout view of an embodiment of the present invention.

FIG. 2 is a layout view of another embodiment of the present invention.

FIG. 3 is a layout view of another embodiment of the present invention.

[Explanation of symbols]

 2 Service air tank 5 Air master for rear wheel 6 Double check valve 7 Service air line 9 Dual brake valve 21 Emergency air tank 22 Emergency air line 25 3-way magnet valve 26 Operating air line 27 Switch 31 Stop lamp switch 32 Relay 33 Pedal switch 40 Differential pressure valve 41 Starter switch

Claims (3)

[Scope of utility model registration request] 1. An emergency air tank provided separately from a regular air tank, an emergency air line connected from the emergency air tank to an air master, an opening / closing valve and a cab provided in the emergency air line. An emergency braking device provided with a switch for operating the on-off valve. 2. An emergency air tank provided separately from the service air tank, an emergency air line connected to the air master from the emergency air tank, an opening / closing valve provided in the emergency air line, and the service air tank. An emergency braking device comprising a service air pressure drop detection mechanism for a service air line connected to the air master, and the opening / closing valve being opened when the detection mechanism detects the service air pressure drop. 3. An emergency air tank provided separately from a service air tank, an emergency air line connected to the emergency air tank and an air master, and a starter switch provided in the emergency air line in conjunction with closing of the starter switch. Emergency braking device with open / close valve.