JPS6346294Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is suitable for trucks, mixer trucks, crane trucks, etc., and is equipped with a fluid-operated service brake and parking brake, and also provides sufficient operating force to the parking brake. The present invention relates to a brake system for an automobile that enables the use of a fluid-operated service brake in combination with the brake system.

Traditionally, trucks, mixer trucks, crane trucks, etc. equipped with fluid-operated service brakes are often parked on steeply sloping roads or slopes, so
Alternatively, if the vehicle is parked on a steep road or slope, the parking brake may be engaged and the fluid-operated service brake may be engaged.
The brakes are locked in a braking state by various means to ensure that the truck, mixer truck, crane vehicle, etc. is in a braking state.

However, if you consider the safety of using a fluid-operated service brake in conjunction with a parking brake, it is important to consider the safety of using a fluid-operated service brake in conjunction with a parking brake. The parking brake requires sufficient operating force to be applied to the brake and then to place the fluid-operated service brake in a braking state to assist the parking brake in braking. According to conventional means, such as detecting the stroke of a parking lever in a vehicle and placing a fluid-actuated service brake in a braking state, if the parking lever is pulled up with a predetermined stroke, the fluid-actuated service brake is activated.・While the brake is placed in a braking state, in the case of a parking brake whose original purpose is to stop and park the vehicle,
Sufficient operating force is not necessarily applied, and therefore, it has been difficult to satisfy the above-mentioned requirements.

The purpose of this invention is to apply sufficient operating force to the parking brake, and use the fluid-operated service brake in conjunction with the parking brake to provide a predetermined braking force. A locking means for ensuring the braking condition and restricting the movement of the pedal hook hooked to the brake pedal, in particular in the depressed position, is provided.
To provide a brake system for an automobile that securely stops the movement of a pedal/hook in the hooking direction under normal conditions, prevents the brake pedal from being depressed, and improves safety.

Hereinafter, preferred specific examples of the automobile brake system according to this invention will be explained with reference to the drawings.

1 and 3 show an automobile brake system 10 of this invention applied to a mixer truck.

The brake system 10 of the automobile includes an air service brake 11 as a fluid-operated service brake, a parking brake 16, a pedal hook 22, and a hook operating rod 24.
It is comprised of a pneumatic locking device 26, an electrical control valve 34, and a load sensor 40.

Since the air service brake 11 is configured in the same manner as the existing air service brake, a description of its configuration 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 22 pivotally connected to the cab floor 86 side.

That is, the pedal hook 22 has a reverse abbreviation T.
It is formed in a letter shape, and its lower end is pivotally connected to a bracket 23 fixed to the upper surface of the cab floor 86, and the lower end of the brake pedal 13 is hooked onto the pedal hook 22. A pin 15 is attached via a bracket 14.

Of course, the pedal hook 22 can be used to
It is configured so that it is always returned to its normal state by a spring.

The pedal hook 22 configured in this way is
It is rotated by a hook operating rod 24.

The hook operating rod 24 has one end rotatably attached to the tip of the pedal hook 22, and the other end supported so as to be able to reciprocate and slide toward the vehicle body via a bracket 87. A knob 25 is attached to the other end projecting outward.

A pneumatic locking device 26 is fixed in front of the bracket 23 that pivotally connects the pedal hook 22 described above so as to lock the pedal hook 22 in a normal state.

The pneumatic locking device 26 has air inside.
a chamber 28, a rod hole 3 connected to the air chamber 28 and formed in the rod cover wall;
3, a casing 27 having a port 29 connected to the air chamber 28 and formed near the rod hole 33, and a piston fitted into the air chamber 28 of the casing 27 so as to be able to reciprocate and slide. 30, and a locking rod having one end fixed to the piston 30 and fitted into the rod hole 33 with the other end movable in and out of the casing 27 so as to lock the pedal hook 22 under normal conditions. It consists of a rod 31 and a return spring 32 disposed within its air chamber 28 to bias its piston 30 to one side.

That is, the piston 30 has its locking rod 31 inserted into the rod hole 33 of the casing 27.
A return spring 32 is disposed on the other side of the piston 30, and a return spring 32 is disposed on the other side of the piston 30.
A plug 38 is fitted into the open end of the air chamber 28 so as to press the return spring 32 against the piston 30 side.

Of course, in this way, one end of the piston 30 fitted into the air chamber 28 is connected to the port 2.
The piston 30 is cut out in a ring shape so that the compression sent from the piston 9 can retract the piston 30 against the return spring 32.

Pneumatic locking device 26 so configured
is bolted to the bracket 23 so that its locking rod 31 can be hooked onto the tip of the aforementioned pedal hook 22, and further,
Port 29 of pneumatic locking device 26 is connected to air via locking device control piping 37.
It is connected to the air tank (not shown) of the service brake 11.

Therefore, under normal conditions, the tip of the pedal hook 22 is in contact with the locking rod 31 of the pneumatic locking device 26.
When the piston 30 and locking rod 31 are retracted, compressed air is sent into the air chamber 28 of the pneumatic locking device 26 to lock the pedal hook. 22 is configured to release the locked state.

Also, port 2 of the pneumatic locking device 26
9 and an air tank (not shown) of the air service brake 11, a lock device control pipe 37 is provided with an electric control valve 34 that is opened and closed by an electric signal.

In addition, the parking brake 16 is
A parking lever 17 and a parking lever are attached to the upper surface of the floor 86 via a ratchet 20.
It is composed of a brake body 18, a coupling mechanism 21, etc., and one end of the coupling mechanism 21 is connected to the parking
It is connected to the base side of the lever 17, and the other side is connected to the brake lever 19 of the parking brake main body 18 via a load sensor 40.

The load sensor 40 includes a sensor housing 4
1 is fitted into a bore 53 formed in the sensor housing 41 so as to reciprocate within a predetermined stroke range, and has one end extending outside the sensor housing 41 and a stopper 65 at the other end. A load plunger 42 is provided within the bore 53 such that the load plunger 42 is restrained at one end by the stopper 65 and biases the load plunger 42 to one side within the bore 53.
a load spring 43 disposed coaxially around the load plunger 43 and deflecting above a set load; and a threaded hole 62 opened in the sensor housing 41 at the other end of the load plunger 42.
a plug 63 screwed into the plug 63; a lead wire connector 71 connected to the plug 63;
A pushing plunger 44 pressed against the other end, and an electrical contact carrier 4 fitted to the pushing plunger 44 so as to be slidable back and forth.
5, a pair of fixed electrical contacts 46, 47 fixed in the plug 63, and the fixed electrical contacts 46,
a movable electrical contact 48 held in its electrical contact carrier 45 so as to be able to contact the electrical contact carrier 47; a movable electrical contact pushing spring 49 pushing the movable electrical contact 48 toward the fixed electrical contacts 46, 47 so as to force it into the carrier guide bore 66 of the plunger 44;
A compression spring 5 interposed between the pushing plunger 44 and the electrical contact carrier 45 to force the pushing plunger 44 and the electrical contact carrier 45 away from each other.
It consists of 0 and more.

The sensor housing 41 is closed at one end;
Cylindrical housing body 51 having an opening 56 at the other end
Then, a bolt 7 is attached to one end of the housing body 51, that is, the open end so as to close the opening 56.
5, and thus a bore 53 is formed in the housing body 51 thereof.
is formed.

The housing body 51 forms a pair of pin bosses 57 on a body wall 54, and the parking brake 1
6 brake lever 19 can be connected with a pin,
Additionally, a hole 58 is formed in the end wall 55 to allow one end of the load plunger 42 to extend outside the housing body 51 thereof. The housing main body 51 also has a hole 58 and one end 6 of the load plunger 42.
4, its hole 58 for a dust seal between
An annular groove 59 is formed on the inner surface of the ring, and an O-ring 60 can be fitted into the annular groove 59.

The lid plate 52 has a boss 61 protruding from its outer surface, a screw hole 62 formed in the boss 61, and a pushing
Plugs 63 for plungers 44, electrical contact carriers 45, fixed electrical contacts 46, 47, movable electrical contacts 48, etc. can be screwed in.

The load plunger 42 is connected to its sensor housing 4 so as to reciprocate within a predetermined stroke range.
1, a connecting rod 64 is integrally formed at one end, and the load spring 4
A flange 65 as a stopper for 3 is formed at the other end.

The connecting rod 64 extends outside the sensor housing 41 through a hole 58 formed in the end wall 55, has a threaded hole 76 at its tip, and connects to the threaded rod at the rear end of the parking brake cable. I'm trying to get screwed.

As such, the load plunger 42 is connected to the parking lever 17 via a coupling mechanism 21 such as a parking brake cable, idle lever, link rod, push rod, etc.

The load spring 43 has a predetermined load,
That is, the load plunger 42 is set to be bent by a predetermined brake operation force or more, and when no brake operation force is applied, the load plunger 42 is pressed against the cover plate 52 to create a clearance between the load plunger 42 and the end wall 55. There is. The clearance is determined by the distance between the fixed electrical contacts 46, 47 and the movable electrical contact 48.

The pushing plunger 44 is fitted into the guide bore 69 of the plug 63 so as to be able to slide back and forth, and keeps its tip in constant contact with the other end of the loading plunger 42 . The pushing plunger 44 also has a carrier guide bore 66 at its rear end, into which the tip of the electrical contact carrier 45 can fit.

The electrical contact carrier 45 is a carrier guide.
A stopper flange 67 is provided on the outer circumferential surface of the distal end side that is fitted into the bore 66 so as to be slidable back and forth, and a spring seat 68 is formed at the distal end. Furthermore, the electrical contact carrier 45 has a movable electrical contact 48 attached to its rear end.

The fixed electrical contacts 46 and 47 are fixed in advance to the tips of a lead wire connector 71, and lead wires 73 and 74 are connected to them respectively, and the lead wire connector 71 is inserted into the connector screw hole 70 of the plug 63. Once screwed in, it is secured within its plug 63.

The movable electrical contact 48 is connected to an electrical contact carrier 45
It is fixed to the rear end of the movable electric contact pushing spring 49 and is press-molded into the vertical cross-sectional shape shown, that is, a cap shape, so as to constitute one spring seat of the movable electric contact pushing spring 49.

Its movable electrical contact pushing spring 49
is positioned between the electrical contact carrier 45 and the lead connector 71, with one end seated on the movable electrical contact 48 and the other end seated on the spring seat 72 of the lead wire connector 71;
0 has one end attached to the bottom wall of the carrier guide bore 66 and the other end attached to the spring of the electrical contact carrier 45.
They each sit on a seat 68 and are arranged between the pushing plunger 44 and the electrical contact carrier 45.

The load sensor 40 configured in this manner is incorporated into the parking brake 16 by pin-coupling the housing body 51 to the brake lever 19 and screwing the load plunger 42 to the rear end of the parking brake cable; Further, the lead wire 73 is connected to the battery 35, and the lead wire 74 is connected to the electric control valve 3 mentioned above.
4 respectively.

Of course, the fuse 36 is incorporated into the lead wire 73.

Further, a pressure switch 77 is attached to the above-mentioned pneumatic lock device 26, and a lead wire 81 connected to one contact point of the pressure switch 77 is connected to the battery 35, and a lead wire 82 connected to the other contact point. is connected to a lamp 79 built into the bracket 87.

That is, the lamp 79 is activated by compressed air being directed into the air chamber 28 of the pneumatic locking device 26, and the piston 30 and locking rod 3
1 lights up when retracted, pulls the hook operating rod 24, and via the pedal hook 22,
To make the driver aware that the brake pedal 13 is in a state where it can be locked.

Of course, the pressure switch 77 can also be attached to the electrical control valve 34.

Furthermore, the bracket 23 pivotally connecting the pedal hook 22 described above is provided with a bracket 23 that contacts the pedal hook 22 when the brake pedal 13 is locked by the pedal hook 22;
A push button switch 78 that is energized when pressed is attached, and a lead wire 83 is connected to one contact point of the push button switch 78.
is connected to the battery 35, and a lead wire 84 connected to the other contact is connected to a lamp 80 built into a bracket 87.

That is, the lamp 80 lights up when the pedal hook 22 is rotated by pulling the hook operating rod 24 and the brake pedal 13 is locked, and indicates to the driver that the brake pedal 13 has been locked. Make them aware.

Of course, a fuse 85 is built into the lead wire 81.

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

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

In such a state, when the parking lever 17 is pulled up, the sensor housing 41 of the load sensor 40 is pulled by the coupling mechanism 21 while remaining connected to the load plunger 42 via the load spring 43, and the brake is applied. - Rotate the lever 19.

Furthermore, when the parking lever 17 is pulled up and reaches a predetermined operating force, the amount of deflection of the load spring 43 increases and is compressed in this way, and one end of the load plunger 42 is connected to the sensor.
It contacts the end wall 25 of the housing 41. Therefore,
The brake lever 19 is further rotated to generate a predetermined braking force on the axle, and the pushing plunger 44 and the electrical contact carrier 45 are integrally loaded by the movable electrical contact pushing spring 49 and the compression spring 50. Moving toward the plunger 42, the movable electrical contact 48 contacts the fixed electrical contacts 46 and 47.

Thus, when the movable electrical contact 48 contacts the fixed electrical contacts 46, 47, the closed electrical control valve 34 is actuated and opened, causing the air tank (not shown) of the air service brake 11 to open. Compressed air from the pneumatic locking device 26 is fed into the air chamber 28 of the pneumatic locking device 26 via the locking device control line 32.

Of course, since the pedal hook 22 is normally located, the tip of the pedal hook 22 is hooked onto the locking rod 31 of the pneumatic locking device 26, as shown in FIG. It is locked.

Therefore, when compressed air is delivered into the air chamber 28 of the pneumatic locking device 26 under such conditions, the piston 30 and the locking
The rod 31 is retracted against the return spring 32, and the locking rod 31 is disengaged from the tip of the pedal hook 22, so that the hook operating rod 24 can be pulled.

At this time, the pressure switch 77 attached to the pneumatic locking device 26 is energized and the lamp 79 lights up, indicating that a predetermined operating force is being applied to the parking brake 16 and that the hook operating rod 24 is being applied. This makes the driver aware that the brake pedal 13 is in a state where it can be locked.

After confirming that the lamp 79 is lit, pull the knob 25 of the hook operating rod 24.

When the hook operating rod 24 is pulled, the pedal hook 22 is rotated toward the brake pedal 13, and in this state, when the foot is released from the brake pedal 13, the brake pedal 13 is rotated.
A pin 15 attached to the back side of the air service brake is hooked onto the tip of the pedal hook 22, and the brake pedal 13 is locked to maintain the air service brake 11 in a braking state.

To release the locked state of the brake pedal 13, the parking lever 17 is pushed down and the hook operating rod 24 is pushed back.

That is, when the parking lever 17 is pushed down, the movable electrical contact 48 of the load sensor 40 separates from the fixed electrical contacts 46, 47 by an action opposite to that described above, and therefore the electrical control valve 34 is closed. The compressed air sent to the downstream side of the electric control valve 34 is exhausted in the lock device control piping 37.

Therefore, the piston 3 of the pneumatic locking device 26
0 and the locking rod 31 are pushed by the return spring 32, and in such a state, when the hook operating rod 24 is pushed back, the pedal hook 22 is pressed against the pin 1 of the brake pedal 13.
5 and the brake pedal 13 is unlocked.

Of course, when the compressed air in the air chamber 28 of the pneumatic locking device 26 is exhausted with the pedal hook 22 hooked on the pin 15 of the brake pedal 13, the locking rod 31 is The tip is pushed outward and contacts the side surface at the tip of the pedal hook 22, and when the pedal hook 22 is rotated by pushing back the hook operating rod 24, the pedal hook 22 is rotated. The tip of
When passing the position of the locking rod 31, the tip of the locking rod 31 is projected by the return spring 32 and hooked on the tip of the pedal hook 22, and the pedal hook 22 is Locked.

Brake system 10 of the above-mentioned automobile according to this invention
In , the fluid-operated service brake was explained as an air service brake 11.
A hydraulically operated service brake can also be applied, in which case a separate air tank is installed as a source of compressed air for the pneumatic locking device 26.

According to the above invention, a pneumatic locking device includes a casing fixed to the vehicle body, a piston fitted into an air chamber of the casing so as to be able to slide back and forth, and one end fixed to the piston.
and a locking rod whose other end can be moved in and out of its casing so as to normally lock the pedal hook, and a return spring disposed in its air chamber so as to bias its piston to one side. It consists of
Normally, when the car is running, in the depressed position, the movement of the pedal hook that is hooked on the brake pedal in the hooking direction is reliably stopped, and the brake pedal is never in the depressed state. The load sensor is fitted into a bore formed in the sensor housing so as to reciprocate with the sensor housing within a predetermined stroke range; a load plunger extending outside the sensor housing at one end and having a stop at the other end; and disposed within the bore such that the load plunger is restrained at one end by the stop and biases the load plunger to one side within the bore. a load spring which is deflected by a set load or more, a plug screwed into a threaded hole opened in the sensor housing at the other end of the load plunger, and a lead wire connector connected to the plug. a pushing plunger that is reciprocally slidably fitted in the guide bore of the plug and always pressed against the other end of the load plunger; a contact carrier and a fixed electrical contact secured within the plug;
a movable electrical contact held in the electrical contact carrier so as to be able to contact the fixed electrical contact; and a movable electrical contact disposed between the lead wire connector and the electrical contact carrier on the fixed electrical contact side. a movable electrical contact pushing spring for pushing the electrical contact; and a compression spring interposed between the pushing plunger and the electrical contact carrier to force the pushing plunger and the electrical contact carrier away from each other. As a result, temperature compensation means are omitted, and the actuation force of the parking lever is accurately sensed and converted into an electrical signal, so that its fixed electrical contact remains stable even under severe vibrations, especially when the actuation force is not applied. The movable electrical contacts are always kept separated from each other to avoid malfunctions and can be used under such severe vibrations, and with the use of the load sensor, the parking brake is sufficiently When a certain operating force is applied and a predetermined braking force is applied by the parking brake, the fluid-operated service brake is reliably used in combination with the parking brake, resulting in more reliable braking for stopping and parking. This improves the safety of the vehicle when stopping and parking.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a specific example of the automobile brake system of this invention, FIG. 2 is a vertical cross-sectional view of a pneumatic locking device, and FIG. 3 is a vertical cross-sectional view of a load sensor. 11...Fluid operated service brake, 13
... Brake pedal, 16 ... Parking brake, 17 ... Parking lever, 19 ...
Brake lever, 22...Pedal hook, 2
4... Hook operating rod, 26... Pneumatic locking device, 34... Electric control valve,
40...Load sensor.

Claims (1)

[Scope of claim for utility model registration] A fluid-operated service brake, a parking brake, and a pedal that is pivotally connected to the vehicle body and that locks the brake pedal of the fluid-operated service brake at a predetermined depression position. - a hook, a hook operating rod whose tip is attached to the pedal hook so that the pedal hook can be rotated, and which is supported so as to be able to slide back and forth on the vehicle body side; a casing fixed to the vehicle body side; A piston fitted in an air chamber of the casing so as to be slidable back and forth, one end fixed to the piston and the other end movable into and out of the casing so as to lock the pedal hook under normal conditions. Consists of a locking rod and a return spring placed in the air chamber to bias the piston to one side, and connect the air chamber to the air tank side via the pedal hook control piping. a pneumatic locking device, an electric control valve provided in the pedal hook control piping, a sensor housing, and a sensor housing that is fitted into a bore formed in the sensor housing so as to reciprocate within a predetermined stroke range. a load plunger mated and having one end extending outside the sensor housing and a stopper at the other end, the bore being restrained at one end by the stopper to bias the load plunger to one side within the bore; A load spring is located inside the spring and deflects when the load exceeds a set load, and the sensor
A plug screwed into a threaded hole opened in the housing, a lead wire connector connected to the plug, reciprocally slidably fitted into the guide bore of the plug, and always connected to the load plunger. a pushing plunger pressed against the other end, an electrical contact carrier slidably mated to the pushing plunger, and a fixed electrical contact fixed within the plug;
a movable electrical contact that is held in the electrical contact carrier so as to be able to contact the fixed electrical contact; a pushing movable electrical contact pushing spring; and a compression spring interposed between the pushing plunger and the electrical contact carrier to force the pushing plunger and the electrical contact carrier away from each other; In a brake, a load sensor is disposed either between the brake lever and the connecting mechanism or between the parking lever and its connecting mechanism, and is connected to the electric circuit of the electric control valve. Automobile brake systems, including