JPS6144014Y2 - - 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. This invention relates to a hanger pin retaining device in a disc brake device in which a pair of hanger pins that are slidably suspended in the direction of the rotational axis of the brake disc are installed in a manner that they can be freely inserted and removed. The object of the present invention is to easily and reliably prevent the pair of hanger pins from coming off.

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). This bracket B is attached to the vehicle body 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 . Thus, the bracket B exists only on the brake disc rotation side of the brake caliper C.

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.
It is screwed onto the support hole 41 at the upper end of the bracket B and slid into the support hole ₄₁ at the upper end of the bracket B. 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 ₂
is formed into a hollow cylindrical shape as a whole, and is removably fixed to the side surface of the bracket B at a radially inward position of the brake disc D with a bolt 5, and is also attached to a support hole in the lower ear portion ₃₂ of the brake caliper C. 4 It is rubbed together with ₂ . 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 , 7 ₂ that straddle P ₁ , P ₂ , and is bridged between the arms 7 ₁ , 7 ₂ 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, each hanger pin 8 is provided with a positioning protrusion 20 on the outer periphery of one end, and an annular groove 21 on the outer periphery of the other end. ₁ to determine the installation position of the hanger pin 8, and expose the annular groove 21 to the outside of the second clamping arm ₇₂ (see FIG. 5). Both hanger pins 8, 8
One elastic retaining plate 22 is engaged with the annular grooves 21, 21 in the following manner and attached to the brake caliper C.

That is, as shown in FIG. 8, the retaining plate 22 is made of a thin spring steel plate, and has a pair of locking pieces 23,
and a connecting piece 24 that connects the upper ends of these locking pieces 23, 23 to each other, and both locking pieces 23,
23 have large diameter holes 25, 25, respectively, and U openings on the upper inner circumferences of these large diameter holes 25, 25, respectively.
The engagement protrusions 27, 27 are bent into hook-shaped cross sections at the lower portions of the large diameter holes 25, 25, and these engagement protrusions 27,
At the lower part of 27, hook portions 28, 28 are provided which respectively protrude in opposite directions. In this case, the distance between both large diameter holes 25, 25 and both locking grooves 26, 26 is the distance between both hanger pins 8, 8.
The large diameter holes 25 allow the hanger pin 8 to be inserted therethrough, and the locking grooves 26 are formed so as to be able to engage with the annular grooves 21 of the hanger pin 8. On the outer surface of the brake caliper C, a pair of protrusions 29, 29 are formed at the top of both hanger pins 8, 8, respectively, and a pair of engagement recesses 3 are formed at the bottom of both hanger pins 8, 8, respectively.
0,30 are formed. After inserting the ends of the hanger pins 8, 8 exposed from the outer surface of the second pinching arm ₇₂ into the large diameter holes 25, 25, respectively, the retaining plate 22 is pushed down to engage the two hanger pins 8, 8. Convex portion 27,2
7 into both the engagement recesses 30, 30, respectively, and engage them with elastic force, both the locking grooves 26, 26 will fit into the annular grooves 21, 21 of both the hanger pins 8, 8, respectively.
engage all at once. Thus, both engaging convex portions 27,2
7 and both engagement recesses 30, 30, the retaining plate 22 is attached to the outer surface of the brake caliper C without wobbling. The hanger pins 8, 8 are reliably engaged with the annular grooves 21 of the hanger pins 8, so that they do not come off, and both the hanger pins 8, 8 are prevented from moving in the axial direction by the locking pieces 23, 23 in the annular grooves 21, 21, that is, they are prevented from coming off. It will be done.

Also, since both protrusions 29, 29 abut against the inner surface of the upper part of the retaining plate 22 and press it outward, the upper part of the retaining plate 22 bends outward, and thus both retaining grooves 2
Since the peripheral edges of the annular grooves 21 and 26 press against the inner surfaces of the annular grooves 21 and 21 on the positioning protrusion 20 side, the engagement between the retaining plate 22 and the hanger pins 8 and 8 becomes even stronger, 8, 8 is prevented from shaking in the axial direction. Note that both hook portions 28, 28 are connected to both engaging recesses 30, 30, respectively.
It is exposed to the outside from the lower edge, which makes it easier to remove the retaining plate 22.

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 engaged 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 explained. 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 comes 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 2 ₁ , the support hole 4 ₁ , and the second sliding pin 2 _{2 .}
and the support hole ₄₂ while moving in the opposite direction to the piston 15, pressing the back surface of the second friction pad _P2 with the second pinching arm ₇₂ , and pushing it against the brake disc D. By pressing it 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 applied from the brake disc D to the friction pads P ₁ and P ₂ is supported by the torque bearing surface 11 of the bracket B. This braking torque may cause some bending deformation in the bracket B, but 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 will exist on the opening side of the brake caliper C that will not be interfered with by the bracket B or the axle (not shown). .
Therefore, a tool such as a flathead screwdriver is inserted between each hook portion 28, 28 of the retaining plate 22 and the outer surface of the second pinching arm ₇₂ , and the respective engaging convex portions 27, 27 are removed from each engaging concave portion. 30, 30, each locking piece 23,
23 through the large diameter holes 25, 25, and the hanger pin 8,
8 and pull out the hanger pins 8, 8 from the positioning protrusions 20, 20 side, the friction pads P ₁ and P ₂ can be easily taken out.Installing new parts to replace them can be done in the opposite way to the above. It is done according to the procedure.

As described above, according to the present invention, an annular groove 2 is formed on the outer periphery of the end protruding from the outer surface of the brake caliper C of the pair of hanger pins 8, 8 that suspend the friction pads.
1 and 21, and a pair of large diameter holes 25 and 25 that allow the insertion of both hanger pins 8 and 8, respectively, are formed in one elastic retaining plate 22 for preventing both hanger pins 8 and 8 from falling out. The annular grooves 21, 2 of both hanger pins 8, 8 are opened in the diameter holes 25, 25, respectively.
1, a pair of U-shaped locking grooves 26,
26, and the elastic retaining plate 22 is connected to the annular groove 21,
21 and the locking grooves 26, 26, the elastic retaining plate 22 is elastically engaged with the outer surface of the brake caliper C. The locking grooves 26, 26 can be engaged with the annular grooves 21, 21 of both hanger pins 8, 8 by simply moving the elastic retaining plate 22, and the elastic retaining plate 22 can be moved outside the brake caliper. To fix it to the side surface, it is sufficient to simply engage the concave and convex portions, and therefore the elastic retaining plate 22 can be attached without using any tools. Therefore, it is easy to assemble and disassemble the device, and the friction pad P ₁ ,
It is possible to speed up the replacement work with new parts of _P2 .

[Brief explanation of drawings]

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. 3 is a sectional view taken along the - line in Fig. 2. , 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 of Fig. 1, and Fig. 6
7 is a front view of the bracket, FIG. 7 is another side view of the brake device, and FIG. 8 is a perspective view of the retaining plate. 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, 21... Annular groove, 22...
...Preventing plate, 25...Large diameter hole, 26...Latching groove,
27... Engagement convex portion, 30... Engagement recess.

Claims (1)

[Scope of utility model registration request] The friction pads P 1 and P 2 are sandwiched between the first and second sandwiching arms 7 ₁ and 7 ₂ of the brake caliper C, which sandwich a pair of friction pads P ₁ and P ₂ that face and cooperate with both sides of the brake disc D. In a disc brake device in which a pair of hanger pins 8, 8 for slidably suspending pads _P1 , _P2 in the direction of the rotational axis of the brake disc D are removably installed, both the hanger pins 8,8
Annular grooves 21, 21 are provided on the outer periphery of the end protruding from the outer surface of the brake caliper C, and one elastic retaining plate 22 is provided to prevent both hanger pins 8, 8 from coming off.
A pair of large-diameter holes 25, 25 each allow the insertion of the two hanger pins 8, 8, and annular grooves 21, 21 of the two hanger pins 8, 8 open in the large-diameter holes 25, 25, respectively. A pair of U-shaped locking grooves 26, 26 that engage are provided, and the elastic retaining plate 22 is connected to the annular grooves 21, 21 and the locking groove 2.
6 and 26. A hanger pin slip-out prevention device for a disc brake device, in which the elastic retaining plate 22 is elastically engaged with the outer surface of the brake caliper C in a concave and convex manner so as to be held in each engagement position with the brake caliper C.