JPS6333727Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a parking brake operating load detection device.

Conventional parking brakes have a means for notifying the operator when the stroke of the operating rod exceeds a set value by operating the handle.
Lamps placed in appropriate locations are designed to light up. However, even if the operating rod is pulled beyond a predetermined stroke and the lamp lights up due to a parking brake assembly error, wear of the lining, or loosening of the cable, the lamp does not maintain the parking state safely. In some cases, the amount of operating load applied to the brake is not applied to the brake.

In contrast to the conventional detection using the stroke of the operating rod, the present invention has a structure in which a notification means (lamp) is activated to notify this when the operating load applied to the brake reaches a set value or more. To provide a parking brake operating load detection device that is simple and has little variation in performance.

Hereinafter, embodiments of the present invention will be described based on the drawings.

Please refer to FIG. Parking brake 1 is
The equalizer 2 is connected via a cable 6 to a lever 5 whose one end is pivotally attached to the vehicle body 4. The operation lever 5 is operated via the load detection means 7,
It is connected to a ratchet toothed operating rod 8. A pawl is incorporated into the bracket 3 which engages the ratchet teeth of the operating rod 8. Now, when the handle 9 is pulled and the operating rod 8 is operated, the lever 5 rotates about the fulcrum 10 and applies an operating force to the parking brake 1 via the cable 6. When this operating force exceeds a predetermined value, the load detection means 7 senses this value and generates a signal. Based on this signal, the operator senses that a necessary load is being applied to the parking brake 1.

An example of a specific configuration of the load detection means 7 is shown in FIGS. 2 to 5. Reference numeral 11 denotes a hollow sleeve having a large diameter portion 11a and a small diameter portion 11b, and an operating rod 8 is loosely fitted into the small diameter portion 11b of the sleeve to receive a pin 12 press-fitted into the operating rod 8. Elongated holes 11c are provided oppositely on the circumference. (See FIG. 5) The width of the elongated hole 11c is appropriately larger than the outer diameter of the pin 12, as indicated by the symbol F in FIG. In addition, the sleeve 1
The large diameter portion 11a of 1 is provided with a pin hole 11e for pivotally mounting the operating lever 5, and is also provided with a guide passage groove 11d for a member to be described later.

Reference numeral 13 denotes a collar, which is fitted onto the outside of a threaded portion provided at the tip of the operating rod 8 extending into the large diameter portion 11a of the sleeve, and is fixed with a washer 14 and a nut 15.

A seat plate 16 is disposed on the collar 13, and one end of the seat plate 16 extends outside the sleeve 11 through the passage groove 11d of the sleeve 11. A displacement take-out plate 17 to be taken out of the sleeve 11 is loosely fitted, and the displacement take-out plate 17 is guided by the passage groove 11d of the sleeve 11, and the large diameter part 1 of the sleeve 11
A coil spring 18 is stretched between the hole 1a and the bottom surface of the hole. The mounting load of this coil spring 18 is set to the operating rod tensile load required for the parking brake. Reference numeral 19 denotes a snap spring provided in the large diameter hole of the sleeve 11, which restricts the leftward movement of the seat plate 16 and the displacement extraction plate 17 by the coil spring 18.

Reference numeral 20 denotes an adjustment screw attached to the displacement extraction plate 17 with a nut 21, and a micro switch 22 is disposed on the sleeve 11 opposite to the adjustment screw 20. Then this adjustment screw 20 and switch 2
The distance H between the second protruding element 22a and the second protruding element 22a is adjusted to be smaller than the dimension indicated by the symbol F. The micro switch 22 is activated by pushing in its protruding member 22a and sends a signal to a notification means (not shown), and 23 is a switch cord and 24 is a clip. Reference numeral 25 denotes a torsion spring for returning the rotation of the operating rod 8, which is attached to the small diameter portion 11 of the sleeve 11.
b, and its one end is locked to the sleeve side and the other end is locked to the pin 12 (see FIG. 2), and urges the operating rod 8 in the clockwise rotation direction with respect to the sleeve 11.

The load detection device of the present invention is constructed as described above, and its effects will be described next.

Grip the handle 9 and insert the first and fourth
When a tensile load is applied in the direction of arrow B in the figure, this tensile load is transmitted to the sleeve 11 via the coil spring 18, the lever 5 rotates around the fulcrum 10, and a braking force is applied to the parking brake 1. Apply. When this tensile load exceeds the set value, the coil spring 18 is compressed, and the collar 13, seat plate 16, and displacement plate 17 fixed to the operating rod 8 are displaced relative to the sleeve 11 in the right direction as seen in FIG. , the adjustment screw 20 collides with the protruding piece 22a of the switch 22, pushes the protruding piece 22a, and the switch 22 is activated. The actuation of this switch 22 activates a notification means (not shown), which notifies the operator that a necessary operating load is being applied to the parking brake 1.

After the coil spring 18 is compressed, pin 1
Since the lever 2 transmits the load, a large load can be applied to the lever 5.

FIG. 6 shows another embodiment. (The same functional parts as in the previous embodiment are given the same numbers.) In other words, the collar 13, which is screwed onto the end of the operating rod 8, is provided with two pieces so that its mounting position with respect to the operating rod 8 can be adjusted. It is double tightened with nuts 15 and 15'.

As mentioned above, the present invention consists of a lever with one end rotatably connected to the vehicle body, a parking brake connected by a cable, a sleeve pivotally connected to the other end of the lever, and a handle attached to one end with ratchet teeth. inserting the other end of the operating rod into the sleeve, inserting a pin fixed to the other end of the operating rod so as to intersect with the operating rod into the elongated circumferential hole of the sleeve;
In a parking brake of a type in which the operating rod is urged to rotate in one direction relative to the sleeve by a return spring whose both ends are engaged with the pin and the sleeve, the width of the circumferential elongated hole is larger than the diameter of the pin. The setting allows the operating rod to move in the axial direction by a predetermined amount with respect to the sleeve, and a displacement extraction plate is provided in the sleeve to take out the axial displacement of the operation rod to the outside of the sleeve, and the displacement extraction plate and A coil spring tensioned between the operating rod and the sleeve transmits a load from the operating rod to the sleeve before transmitting a load to the pin, and when the coil spring is compressed, the coil spring is attached to the displacement extraction plate. A microswitch operated by an adjustment screw is fixed to the outside of the sleeve, and when the operating rod moves axially by a predetermined amount with respect to the sleeve, the pin transmits a load from the operating rod to the sleeve. By activating the notification means based on the signal emitted by the microswitch, it is possible to determine whether the parking brake has been applied sufficiently for safety. Furthermore, since the present invention detects the operating load of the operating rod using a coil spring, the operating load detection performance is stably obtained and the structure is simple. Furthermore, even if the operating stroke of the micro switch changes due to dimensional errors during processing or assembly, it can be adjusted using the adjustment screw, making it possible to compensate for those errors and improve detection accuracy. You can obtain a parking brake operating load detection device.

Further, according to the present invention, when an excessive operating load is applied to the handle and the operating rod, the coil spring is compressed and the operating rod moves a predetermined amount in the axial direction with respect to the sleeve, the pin moves in the circumferential direction of the sleeve. Since the load is directly transmitted from the operating rod to the sleeve through engagement with the elongated hole, no matter how strong, how quickly, and how shockingly the operating force is applied to the operating rod, it will not cause unnecessary damage to the coil spring and micro switch. No load is applied to the coil spring or micro switch, and the coil spring and micro switch are not deformed or damaged, resulting in excellent durability.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram showing an example of a parking brake mechanism, Fig. 2 is a front view of the main part of the parking brake load detection means according to the present invention, Fig. 3 is a plan view of Fig. 2, and Figs. 4 and 5 are FIG. 3 is a cross-sectional view taken along line AA and line B-B, respectively, and FIG. 6 is a cross-sectional view of a main part of another embodiment. 1: Parking brake, 5: Lever, 7: Load detection means, 8: Operation rod, 11: Sleeve,
12: Pin, 13: Collar, 17: Displacement extraction plate,
18: Coil spring, 20: Adjustment screw, 2
2: Switch, 25: Torsion spring.

Claims (1)

[Scope of utility model registration request] A parking brake is connected by a cable to a lever whose one end is pivotally connected to the vehicle body, a sleeve is pivotally connected to the other end of the lever, and the other end of a ratchet toothed operating rod with a handle attached to one end is connected to the sleeve. A pin that is fixed to the other end of the operating rod so as to intersect with the operating rod is inserted into the elongated circumferential hole of the sleeve, and a return spring that has both ends locked to the pin and the sleeve is used to tighten the operating rod. In a parking brake of the type in which the pin is rotationally biased in one direction with respect to the sleeve, the width of the circumferential elongated hole is set to be larger than the diameter of the pin, so that the operating rod moves in the axial direction by a predetermined amount with respect to the sleeve. A displacement extraction plate is provided in the sleeve to extract the axial displacement of the operating rod to the outside of the sleeve, and a coil spring tensioned between the displacement extraction plate and the sleeve allows the displacement of the operating rod to be removed from the sleeve. A micro switch is fixed to the outside of the sleeve and is actuated by an adjustment screw attached to the displacement plate when the coil spring is compressed. An operating load detecting device for a parking brake, wherein a load is transmitted from the operating rod to the sleeve by the pin when the operating rod moves axially by a predetermined amount with respect to the sleeve.