JPS6121620Y2 - - Google Patents

Description

[Detailed description of the invention] The invention provides two friction pads between the first and second sandwiching arms of the brake caliper, which sandwich a pair of friction pads that face and cooperate with both sides of the brake disc. The present invention relates to the hanger pin removal prevention device in a disc brake device in which a pair of hanger pins that are slidably suspended in the direction of the rotation axis of the brake disk are installed in a manner that they can be freely inserted and removed.

Conventionally, as shown in Utility Model Application No. 47-118681, a hanger pin retaining device has been used, for example, in which the retaining member has hooked ends at both ends of a wire made of spring wire. It is known that, after being hooked to the annular groove of the hanger pin, the hook end of the other pin is hooked to the annular groove of the other pin by utilizing the elasticity of the wire to prevent both hanger pins from coming out. There is.

However, the hooked end is merely bent toward the center of the wire, and has only the function of being hooked into a portion of the annular groove. Therefore, if a foreign object is present in the hooking portion or the hook end is caught on a foreign object, there is a risk that the hook end will immediately come off the annular groove and the retaining member will deviate from the pin.

The present invention has been developed in view of the above-mentioned problems, and its purpose is to make it possible to easily, reliably, and long-term prevent the pair of hanger pins from being removed by using a single removal-preventing member. .

In order to achieve the above object, the hanger pin removal prevention device of the present invention has a positioning protrusion on the outer periphery of one end of a pair of hanger pins that suspend friction pads that protrudes from the side surface of the brake caliper, and a positioning protrusion that protrudes from the other side surface. An annular groove is provided on the outer periphery of each end, a pair of coil springs are wound around the bottoms of these annular grooves with their winding directions being reversed, and one ends of these springs are integrally connected to each other via a wire, The other end is symmetrically opened and formed into an operating piece.

An embodiment of the present invention will be described below with reference to the drawings. The illustrated example is a disc brake device for a motorcycle. D is a brake disc that rotates in the direction of arrow R together with the wheels (not shown) when the vehicle moves forward; a bracket B is placed adjacent to one side of the disc; It is bent in a letter shape (see Figure 6). The vehicle body is attached to this bracket B by mounting bolts 1 and 1.
For example, it is fixed to the front fork F.

Bracket B has first and second brake calipers C parallel to the rotational axis of brake disc D.
They are connected via sliding pins 2 ₁ and 2 ₂ .

Therefore, bracket B is brake caliper C.
Exists only on the brake disc rotation side.

The first sliding pin ₂₁ has a mounting base formed in the form of a bolt, and the upper ear part ₃₁ of the brake caliper C at a radially outward position of the brake disc D.
The support hole 4 at the upper end of the bracket B is screwed into the bracket B.
₁ . In order to protect the sliding surface of the sliding pin ₂₁ , a telescopic boot ₆₁ is stretched between it and the ear portion ₃₁ . On the other hand, the second sliding pin ₂₂ has a hollow cylindrical shape as a whole, and is attached to the bracket B at a position in the radial direction of the brake disc D.
It is removably fixed to the side surface of the brake caliper C with bolts 5, and is slidably fitted into the support hole ₄₂ of the lower ear portion ₃₂ of the brake caliper C. In order to protect the sliding surface of the sliding pin ₂₂ , telescopic boots ₆₂ , ₆₂ are stretched between both ends thereof and the ears ₃₂ , respectively. Thus, as shown in FIG. 1, both sliding pins 2 ₁ , 2 ₂
are aligned approximately in the radial direction of the brake disc D.

The brake caliper C includes first and second friction pads arranged on both the left and right sides of the brake disc D.
It has first and second pinching arms 7 ₁ and 7 ₂ that straddle P ₁ and P ₂ , and the arms 7 ₁ and 7 ₂ are bridged so that they can be inserted and removed. Both friction pads P ₁ ,
The back plates 9 ₁ and 9 ₂ of P ₂ are slidably suspended.

Here, the two hanger pins 8, 8, which are the features of this invention,
To explain the retaining device, a positioning protrusion 20 is provided on the outer periphery of one end of each hanger pin 8, and an annular groove 21 is provided on the outer periphery of the other _end . The installation position of the hanger pin 8 is determined by contacting the side surface, and the annular groove 2
1 is exposed on the outside of the second pinching arm ₇₂ (see FIG. 5). A retaining member 22 is attached to both hanger pins 8, 8 as follows.

That is, as shown in FIGS. 5 and 7, the retaining member 2
2 consists of a pair of coil springs 23, 23 whose winding directions are opposite to each other, and both coil springs 23,
23 are integrally connected to each other via a wire 24 at one end, and the other ends are symmetrically opened to form operation pieces 25, 25. In this case, the distance between both coil springs 23, 23 is made equal to the distance between the axes of both hanger pins 8, 8, and each coil spring 23
is set so that its inner diameter is approximately equal to the bottom diameter of the annular groove 21 in a free state. Then, the operating pieces 25, 25 are rotated in a direction opposite to the winding direction of the corresponding coil springs 23, 23, respectively, and thereby both coil springs 23, 23 are rotated so that their inner diameters are aligned with the hanger pins 8, 8.
The second clamping arm ₇₂ is expanded to be larger than the outer diameter of the coil springs 23,
The coil springs 23, 2 are inserted into the annular grooves 21, 21 by fitting the ends of the hanger pins 8, 8 protruding from the outer surface of the
3, when the operating pieces 25, 25 are released, both coil springs 23, 23 contract by their own elasticity and wrap around the bottoms of the annular grooves 21, 21. In this way, the retaining member 22 is attached to both the hanger pins 8, 8, and cooperates with the positioning protrusions 20, 20 to prevent both the hanger pins 8, 8 from coming off.

Note that the positioning protrusion 20 on the hanger pin 8 may be replaced with a flange integrated with the hanger pin 8, a circlip attached to the hanger pin 8, or the like.

The through holes 10 ₁ , 10 ₂ of the hanger pin 8 provided in each back plate 9 ₁ , 9 ₂ are elongated holes so that each friction pad P ₁ , P ₂ can move slightly in the circumferential direction of the brake disc D. Each back plate 9 ₁ within its movable range,
The end face of the brake disc D on the rotation side of ₉₂ is brought into contact with a torque bearing surface 11 provided on the bracket B.

A pressure oil introduction hole 13 communicating with a known brake master cylinder (not shown) and a hydraulic cylinder 14 connected thereto are formed in the first clamping arm ₇₁ of the brake caliper C. A piston 15 that can press the back plate ₉₁ of the pad _P1 slides together, and a vibration-proof shim plate 16 is inserted between the back plate ₉₁ and the piston 15. The second pinching arm ₇₂ abuts against the back plate ₉₂ of the second friction pad _P2 .

In addition, 18 in the figure is a pad spring attached to the recessed part 17 inside the ceiling part of the brake caliper C.
The pressing protrusion 18a at the center of the lower surface of each back plate 9 ₁ , 9
₂ elastically engages with the positioning grooves 19, 19 at the center of the upper end surface, thereby holding the back plates 9 ₁ , 9 ₂ in position and pressing against the hanger pins 8, 8;
This prevents the friction pads P ₁ and P ₂ from moving inadvertently.

Next, the operation of this embodiment will be described. When pressure oil is supplied from a master cylinder (not shown) to the hydraulic cylinder 14 through the pressure oil inlet 13 by operating the brake pedal, the piston 15, which moves forward due to the oil pressure, is moved to the first friction pad. Since the back surface of P ₁ is pressed, the friction pad P ₁ slides on the hanger pins 8, 8 and is brought into pressure contact with one side of the brake disc D.
Then, due to the reaction, the brake caliper C moves between the first sliding pin ₂₁ , the support hole ₄₁ , and the second sliding pin 2.
₂ and the support hole ₄₂ while moving in the opposite direction to the piston 15, and presses the back surface of the second friction pad _P2 with the second pinching arm ₇₂ , thereby pushing it against the brake disc D. By pressing against the other side surface, it is possible to apply braking to the brake disc D rotating in the direction of arrow R.

During this braking, the braking torque acting from the brake disc D on the friction pads P ₁ and P ₂ is supported by the torque bearing surface 11 of the bracket B. Although this braking torque may cause some bending deformation in the bracket B, since the first and second sliding pins 2 ₁ and 2 ₂ on the bracket B are aligned approximately in the radial direction of the brake disc D, There is almost no change in the distance between the axes of both 2 ₁ and 2 ₂ . Therefore, braking torque is applied to brake caliper C and each sliding pin 2 ₁ , 2 ₂
Therefore, the brake caliper C can slide smoothly due to the reaction force of the piston 15, and the pressing force of both friction pads _P1 and _P2 against the brake disc D can be reliably balanced. As a result, effective braking action can be performed at all times.

Next, in order to replace the worn friction pads P ₁ and P ₂ with new parts, first remove the bolt 5 and separate the second sliding pin ₂₂ from the bracket B. Next, move the brake caliper C to the first position around the first sliding pin ₂₁ .
If the brake disc D is rotated outward in the radial direction as shown by the chain line in the figure, a wide working space exists on the opening side of the brake caliper C that will not be interfered with by the bracket B or the axle (not shown). , so both coil springs 23 of the retaining member 22,
23 from the hanger pins 8, 8 while expanding it in the same way as when attached, and pull out the hanger pins 8, 8 from the positioning protrusion 20 side to remove the friction pads.
P ₁ and P ₂ can be easily taken out, and new parts replacing them can be installed in the opposite manner to the above.

As described above, according to the present invention, a positioning protrusion is provided on the outer periphery of one end of a pair of hanger pins that suspend friction pads that protrude from the side surface of the brake caliper, and an annular groove is provided on the outer periphery of the other end that protrudes from the other side surface. , a pair of coil springs are wound around the bottom of these annular grooves with their winding directions reversed,
One end of these springs is integrally connected to each other via a wire, and the other end is symmetrically opened to form an operating piece, so the cooperation between the position projection and the coil spring ensures that each hanger pin is prevented from slipping out. be able to. In particular, since the coil spring that constitutes the retaining member is wrapped around and attached to the bottom of the annular groove of the hanger pin, the coil spring will naturally deviate from the pin unless an external force is applied to rotate it in the opposite direction to the winding direction. This does not occur, and since the retaining member does not come off, the pin can be prevented from being withdrawn for a long period of time. Moreover, the coil springs are integrally connected via a wire rod, and even if this wire rod were to break, each coil spring would individually wrap around the bottom of the annular groove of the pin, so the pin could not be used as a brake carrier. It never falls out of the pack. or,
Since a pair of coil springs whose one ends are connected to each other can be expanded by operating both operation pieces in opposite directions without providing a rotation prevention means, the coil springs can be expanded.
When attaching and detaching, both operating pieces can be operated at once from a bench or the like, and therefore they can be attached and detached from the hanger pin easily and easily, simplifying and speeding up the work of replacing the friction pad with a new part. be able to. Furthermore, since the pair of coil springs, each of which is a small component, is interconnected to form a single component of an appropriate size, that is, a retaining member, it is convenient to handle and there is no risk of loss when detached. It has the following effects.

[Brief explanation of the drawing]

The drawings show one embodiment of the device of the present invention, in which FIG. 1 is a side view of the brake device, FIG. 2 is a sectional view taken along the line - - in FIG. 1, and FIG. Fig. 4 is a partial plan view of the brake device with main parts cut away, Fig. 5 is a sectional view taken along the - line in Fig. 1, and Fig. 6
The figure is a front view of the bracket, and FIG. 7 is another side view of the brake device. C...brake caliper, D...brake disc, _P1 ...first friction pad, _P2 ...second friction pad, ₇₁ ...first pinching arm, ₇₂ ...second pinching arm , 8... hanger pin, 20... positioning protrusion,
21... annular groove, 22... retaining member, 23...
Coil spring, 24...wire rod, 25...operation piece.

Claims (1)

[Scope of utility model registration request] A pair of friction pads facing and cooperating with both sides of the brake disc are sandwiched between first and second pinching arms of the brake caliper, and the friction pads are slidably slidable in the direction of the rotational axis of the brake disc. In a disc brake device in which a pair of suspended hanger pins are installed in a manner that can be freely inserted and removed, each of the two hanger pins has a positioning protrusion on the outer periphery of one end protruding from the side surface of the brake caliper, and an annular groove on the outer periphery of the other end protruding from the other side surface. A pair of coil springs are wound around the bottoms of these annular grooves with their winding directions being opposite to each other. A hanger pin removal prevention device for a disc brake device, which is formed into an operating piece that opens to the outside.