JPH0538252Y2 - - Google Patents

Description

[Detailed explanation of the invention] A. Purpose of the invention (1) Industrial application field The present invention is a hanger pin retaining structure for disc brakes used mainly in vehicles, and in particular a pair of friction pads facing each other on both sides of a brake disc. A pin hole extending in the direction of the rotational axis of the brake disc is provided in the first and second pinch arms of the brake caliper that sandwich the brake disc so that a hanger pin can be freely inserted and removed between them, and both friction pads are suspended on the hanger pin. This invention relates to improvements in the hanger pin retaining structure of disc brakes.

(2) Prior art The applicant previously developed this type of retaining structure,
We are proposing the one described in Utility Model Publication No. 62-6997.

The retaining structure is such that an annular groove is provided on the outer circumferential surface of one end of the hanger pin protruding from the outer surface of the brake caliper, and the retaining groove of the retaining plate is engaged with the annular groove, and the retaining plate is attached to the brake with a screw. It is stuck to the caliper. In this case, the other end of the hanger pin is provided with a stopper that engages with the edge of the pin hole of the brake caliper.

(3) Problems to be solved by the invention However, according to the above-described retaining structure, it is possible to reliably prevent the hanger pin from being withdrawn. If a gap is created between the hanger pins, problems such as rattling of the hanger pins in the axial and radial directions and generation of abnormal noises will occur.

In view of the above, an object of the present invention is to provide a structure for preventing the hanger pin from coming off, which is capable of preventing not only the hanger pin from coming off, but also from wobbling.

B. Structure of the invention (1) Means for solving the problem The invention provides a hanger pin between the first and second pinching arms of the brake caliper that sandwich a pair of friction pads facing each other on both sides of the brake disc. In the hanger pin removal prevention structure for a disc brake, in which a pin hole extending in the rotational axis direction of the brake disk is provided so that the brake pad can be freely inserted and removed, and both friction pads are suspended on the hanger pin, the hanger pin of the brake caliper An annular groove is provided on the outer peripheral surface of the end protruding from the outer surface, and a retaining plate disposed on the outer surface of the brake caliper is connected to a locking piece extending perpendicularly to the hanger pin and the locking piece. The locking piece includes a U-shaped locking groove that engages with the annular groove of the hanger pin and prevents the hanger pin from moving in the axial direction. and a large-diameter hole that extends to the open end of the locking groove and allows the hanger pin to pass therethrough, and fixes the fixing piece to the brake caliper with a screw perpendicular to the hanger pin, and It is characterized in that the tip portion is pressed against the outer circumferential surface of the hanger pin within the pin hole.

(2) Effect According to the above configuration, the hanger pin is prevented from coming off by the cooperation of the annular groove of the hanger pin, the locking groove of the retaining plate, and the screw.

Further, since the hanger pin can be pressed against the inner circumferential surface of the pin hole by the screw, rattling of the hanger pin in the axial direction and the radial direction is prevented.

(3) Embodiment The drawing shows a reaction force disc brake D for an automobile.

1 to 4, the brake disc 1 rotates together with the wheels in the direction of arrow a when the vehicle is moving forward, and in the direction of arrow b when the vehicle is moving backward. facing both sides of brake disc 1,
First and second friction pads 3 ₁ , 3 ₂ are arranged, and these friction pads 3 ₁ , 3 ₂ are sandwiched between first and second pinch arms 5 ₁ , 5 ₂ of the brake caliper 4 . Both ends of the brake caliper 4 in the circumferential direction of the brake disc 1 are supported by a bracket 6 on the outer periphery of the brake disc 1 so as to be slidable in the direction of its rotational axis c.
The bracket 6 is fixed to a knuckle 7 which is a fixed member.

As shown in FIGS. 1 to 3 and 5, the bracket 6 has a frame shape with a closed cross section, and has first and second side portions 8 with intermediate portions facing both sides of the brake disc 1, respectively. ₁ , 8 ₂ and brake disc 1
third and fourth side portions 8 3 and 8 ₄ that mutually connect the sliding pin support portions 9 ₁ and 9 ₂ that exist at both ends of the first and second side portions 8 ₁ and _{8 2} in the radial direction outward; has.

As clearly shown in FIGS. 1 and 6, a sliding pin 11 is installed between two sets of opposing sliding pin support portions 9 ₁ and 9 ₂ , respectively. The male screw portion 11a at the base end of each sliding pin 11 is connected to each sliding pin support portion 9 ₁ on the first side 8 ₁ .
It is screwed into a female screw hole 12 formed in the second side part 82, and each tip part is fitted into a pin hole 13 formed in each sliding pin support part ₉₂ of the second side part ₈₂ . As a result, each sliding pin 11 is arranged so as to extend from one side of the brake disc 1 to the other side.

The brake caliper 4 has ears 14 at both ends in the circumferential direction of the brake disc 1.
is slidably fitted onto each sliding pin 11. In each sliding pin 11, both exposed portions from each ear portion 14 are covered by elastic dustproof boots 15 ₁ and 15 ₂ , respectively.

The brake caliper 4 has first and second pinching arms 5 ₁ ,
The first _{and second} blocks 16 are connected by a pair of bridge portions 18 that connect the circumferential ends of the brake disks 5 and 2.
The blocks 16 ₁ and _{16 2} each have two connecting bolts 19 ₁ and 1 at both bridge portions ₁₈ .
9 Fixed by ₂ .

The ear portion 14 is provided on the bridge portion of the second block ₁₆₂ , so that the second block ₁₆₂ is slidably supported on both sliding pins 11.

First and second pinch arms 5 ₁ , 5 ₂ and both bridge parts 18
A window 21 is defined, and stepped portions 22 extending in the direction of the rotational axis c are formed at both inner ends of the window 21 in the circumferential direction of the brake disk.

Each of the friction pads 3 ₁ , 3 ₂ consists of a back plate 23 and a lining 24 joined to it, and has seventh and eighth friction pads.
As clearly shown in the figure, the hook-shaped portions 23a existing at both ends in the circumferential direction of the brake disk 1 of each back plate 23 are attached to both stepped portions 22 via the retainer 25 to the rotation axis c.
It is suspended so that it can slide freely in the direction.

As shown in Figures 1 and 9, a pin hole 26 is formed in the first and second clamping arms ₅₁ , ₅₂ at the center of the window 21 in the circumferential direction of the brake disc so as to extend in the direction of the rotation axis c, and a hanger pin 27 is installed in the pin hole 26 so as to be freely inserted and removed.

On the back plate 23 of both friction pads 3 ₁ and 3 ₂ , a protrusion 23b is provided at the center in the circumferential direction of the brake disk, and a hanger pin 27 is inserted into a through hole 28 formed in the protrusion 23b. As a result, both friction pads 3 ₁ and 3 ₂ are suspended on the hanger pin 27 .

The following retaining structure is provided between the brake caliper 4 and the hanger pin 27.

As clearly shown in FIGS. 9 and 10, a stopper 29 that engages with the edge of the pin hole 26 is provided at the end of the hanger pin 27 on the second pinch arm ₅₂ side.
On the other hand, a first annular groove 30 ₁ is formed on the outer peripheral surface of the end portion protruding from the outer surface of the first pinching arm 5 ₁ , and in the vicinity of the first annular groove 30 ₁ , a portion of the outer peripheral surface facing the inner peripheral surface of the pin hole 26 is formed. A second annular groove 30 ₂ is formed in the portion.

First pinching arm 5 ₁ Removal prevention plate 3 arranged on the outer surface
1 is composed of a locking piece 23 extending perpendicularly to the hanger pin 27 and a fixing piece 33 connected to the locking piece 23 and extending parallel to the hanger pin 27. The locking piece 32 has a U-shaped locking groove 34 and a large diameter portion 35 continuous to the open end thereof. The large diameter hole 35 allows insertion of the hanger pin 27,
Further, the locking groove 34 is the first annular groove 3 of the hanger pin 27.
0 ₁ to prevent the hanger pin 27 from moving in the axial direction. The fixing piece 33 has a screw insertion hole 36, and a screw 37 that is inserted through the screw insertion hole 36 and is perpendicular to the hanger pin 27 is inserted into the first pinching arm 5.
By screwing into the female threaded hole 38 of ₁ , the fixing piece 33 is fixed to the first pinching arm ₅₁ . Further, the female screw hole 38 communicates with the pin hole 26, and the tip of the screw 37 is pressed against the bottom surface of the second annular groove ₃₀₂ of the hanger pin 27, so that the hanger pin 27 is connected to the pin hole 26.
6 Pressed against the inner peripheral surface.

As clearly shown in FIGS. 1, 7, and 8, a pad spring 39 is engaged with the hanger pin 27, and each end of the pad spring 39 is connected to the first and second friction pads 3 ₁ and 3 ₂ . Each hook-shaped portion 23a is connected to the stepped portion 22.
This prevents the friction pads 3 ₁ and 3 ₂ from wobbling.

As clearly shown in FIGS. 5 and 7, on the first side ₈₁ of the bracket 6, a braking torque bearing part 40 is provided protrudingly in the vicinity of both sliding pin bearing parts ₉₁ , respectively.
A first friction pad 3 ₁ is attached to both braking torque bearing parts 40 .
Both end surfaces of the back plate 23 in the circumferential direction of the brake disc are in contact with each other.

As shown in FIG. 8, both braking torque bearing portions 41 of the second friction pad 3 ₂ are provided protruding from the base ends of both component parts of the bridge portion 18 in the second block 16 ₂ . Both end surfaces of the back plate 23 of the second friction pad 3 ₂ in the circumferential direction of the brake disk are in contact with each other.

In the above arrangement, the exchange of both friction pads 3 ₁ , 3 ₂ takes place through the window 21 .

As clearly shown in FIGS. 2 and 4, the first pinching arm 5 ₁ is located between both connecting bolts 19 ₂ located on the inside.
A pair of cylinders 42 with openings facing the first friction pad ₃₁ are formed along the circumferential direction of the brake disc, and one cylinder 42 is connected to the pressure oil introduction hole 4.
3 to a known master cylinder, and the insides of both cylinders 42 communicate through a communication hole 44.

A piston 45 serving as a pressing member for pressing the first friction pad 3 ₁ against the brake disc 1 is slidably fitted into each cylinder 42 . As shown in FIG. 2, the center of pressure O ₁ by both pistons 45 is
The first friction pad ₃₁ is located at the center in the circumferential direction of the brake disk, and in the illustrated example, is located at the bisecting point of the straight line connecting the axes of both pistons 45.

Thus, both blocks 16 are connected to each other by at least one pair of connecting bolts 19 ₁ and 19 ₂ (two pairs in the illustrated example) arranged on both sides of the brake disk circumferential direction of the piston 45.
₁ , 16 ₂ are fixed, and a pair of sliding pins 11 are arranged on both sides of the brake disk of the piston 45 in the circumferential direction.
It is provided on a fixed bracket 6 of the brake caliper 4 so as to be slidable in the direction of the rotational axis c of the brake disc 1 via the brake caliper 4. Moreover, each connecting bolt 19 ₁ ,
19 ₂ is disposed close to the piston 45, while
Each sliding pin 11 is arranged farther from the piston 45 than each connecting bolt 19 ₁ , 19 ₂ .

As clearly shown in FIG. 2, the pair of fixing points of the bracket 6 to the knuckle 7, in the example shown, the center _O2 of the fixing bolt insertion hole 46 passes through the pressing center _O1 and the brake disc rotation center _O3. On a second straight line _l2 that intersects the first straight line l1 on one side of the brake disc 1 and is located closer to _the brake disc rotation center _O3 than the pressing center _O1 , and on the first straight line l1 _. They are placed on both sides.

In addition, the pair of sliding pin support points of the bracket 6, in the illustrated example, the center _O4 of the female threaded hole 12 (and pin hole 13), is pressed from the second straight line _l2 in parallel to the second straight line _l2 . They are respectively arranged in the area up to the third straight line _l3 passing through the center _O1 .

The positional relationship of each ear portion 14 of the brake caliper 4 with respect to each sliding pin 11 is set as follows.

That is, as clearly shown in FIG. 1, the bisecting point d of the both ear portions 14 in the direction of the brake disk rotation axis c indicates that the brake disk is located between the two friction pads 3 ₁ and 3 ₂ from the initial stage of wear to the wear limit. Each ear portion 14 is supported by each sliding pin 11 so as to move from one side vicinity f ₁ of the thickness direction bisecting point e of ₁ to the other side vicinity f 2 .

As clearly shown in FIG. 3, a pair of straight reinforcing ribs 47 are formed parallel to each other on the outer surface of the second pinching arm ₅₂ so as to extend near both ends in the circumferential direction of the brake disk.

Next, the operation of this embodiment will be explained.

While the automobile is moving forward, when pressure oil is supplied from a master cylinder (not shown) to both cylinders 43 through the pressure oil introduction hole 43 by operating the brake pedal or the like, both pistons 45, which move forward due to the oil pressure, push the first friction pad _31. The friction pad ₃₁ slides on the stepped portion 22 and the hanger pin 27 of the brake caliper 4 and presses the brake disc 1.
is pressed against one side of the Due to the reaction caused by the pressure, the brake caliper 4 slides on both sliding pins 11 in the opposite direction to both pistons 45, and the second friction pad ₃₂ is moved by the second pinching arm ₅₂ to the other side of the brake disc 1. It is pressed against the side, thereby applying braking to the brake disc 1.

During this braking, the braking torque of the first friction pad 3 ₁ is supported by one of the braking torque bearing portions 40 of the bracket 6, and the braking torque of the first friction pad 3 ₁ is supported by the braking torque bearing portion 40 of the bracket 6.
The braking torque is applied to the brake caliper 4, and therefore to one of the braking torque bearing parts 4 of the second block ₁₆₂ .
Supported by 1.

In this case, since each sliding pin 11 is installed on the frame-shaped bracket 6 with a closed cross section, the sliding pins 11 are given rigidity by being supported on both sides, and thereby the second friction pad 3 ₂ is supported. Even if the braking torque is supported by the second block ₁₆₂ , each sliding pin 11 does not bend, and each sliding pin 11 can be made smaller in diameter. Furthermore, since the bracket 6 is constructed as a rigid frame, it has sufficient rigidity even if its weight is reduced, and this, together with the reduction in the diameter of each sliding pin 11, makes it possible to reduce the weight of the disc brake D.

Furthermore, the first and second blocks 16 ₁ ,
Since no force due to braking torque acts on each connecting bolt 19 ₁ , 19 ₂ that fixes 16 ₂ ,
It is possible to avoid a decrease in the strength of the connection structure between both blocks 16 ₁ and 16 ₂ .

Moreover, the brake caliper 4 has each connecting bolt 1
Since it is made into a unit by ₉₁ and ₁₉₂ , it is easy to handle when performing brake maintenance and inspection.

In addition, since each ear portion 14 of the brake caliper 4 is always present on the outer periphery of the brake disc 1 from the initial wear stage to the wear limit of both the friction pads 3 ₁ and 3 ₂ , the brake caliper 4 is not twisted during braking. This does not occur, and together with the improved rigidity of the sliding pin 11, the brake caliper 4 can slide smoothly.

Also, the sliding pin support point O ₄ in the bracket 6
If the arrangement relationship between the fixed point O2 and the fixed point _O2 is specified as above, the distance between them will be shortened, so the rotational moment generated around the fixed point _O2 due to the braking torque will be reduced, which will cause the bracket to 6 can be improved.

Furthermore, since both connecting bolts 19 ₁ and 19 ₂ are disposed close to piston 45 as described above, both blocks 16 ₁ and 16 ₂ in brake caliper 4
This increases the strength of the connection between the two pinching arms 5 ₁ and 5 2 , thereby preventing the pinching arms 5 1 and 5 ₂ from opening when the piston 45 is actuated.

On the other hand, the sliding pin 11 is attached to the piston 4 as described above.
5, both sliding pins 11
The gap between the two is widened, so that the brake caliper 4 can be supported by the bracket 6 with good stability.

Moreover, the first annular groove 30 ₁ of the hanger pin 27,
The locking groove 34 of the retaining plate 31 and the screw 37 work together to ensure that the hanger pin 27 is prevented from coming off.

Moreover, since the hanger pin 27 can be pressed against the inner circumferential surface of the pin hole 26 by the screw 37, rattling of the hanger pin 27 in the axial and radial directions is prevented.

FIG. 11 shows the relationship between the disc brake D and the vehicle body B. The brake caliper 4 is disposed with the window 21 facing the front of the vehicle and the second pinching arm ₅₂ positioned on the wheel W side, and its bracket 6 is fixed to the knuckle 7. Brake disc 1 is wheel W
It is fixed to the hub 48 to which it is attached.

When the brake caliper 4 is arranged in this way,
Since the running wind is introduced into the brake caliper 4 through the window 21, and both reinforcing ribs 47 also function as cooling fins, both friction pads 3 ₁ and 3 ₂ and the brake caliper 4 can be efficiently cooled. .

C. Effects of the invention According to the invention, it is possible to provide a simple hanger pin retaining structure that prevents the hanger pin from slipping out and prevents it from rattling.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a plan view, FIG. 2 is a view taken in the direction of the arrow in FIG. 1, FIG. 3 is a view taken in the direction of the arrow in FIG. Figure 5 is a perspective view of the bracket, Figure 6 is a sectional view taken along the line of Figure 2, Figure 7 is a sectional view taken along the line of Figure 1, Figure 8 is a sectional view taken along the line of Figure 1, and Figure 9 is a sectional view taken along the line of Figure 1. Figure 1-
10 is a perspective view showing the relationship between the hanger pin, the retaining plate and the screw, and FIG. 11 is a perspective view showing the relationship between the vehicle body and the disc brake. 1... Brake disc, 3 ₁ , 3 ₂ ... 1st,
Second friction pad, 4...brake caliper, 5 ₁ ,
5 ₂ ...First and second pinch arms, 26...Pin hole, 2
7... Hanger pin, 30 ₁ ... First annular groove, 31
... Retention plate, 32 ... Locking piece, 33 ... Fixed piece, 34 ... Locking groove, 35 ... Large diameter hole, 37 ...
Screw, c...rotation axis.

Claims (1)

[Scope of utility model registration request] A hanger pin 27 is freely inserted and removed between the first and second pinching arms 5 ₁ , 5 ₂ of the brake caliper 4 that sandwich a pair of friction pads 3 ₁ , 3 ₂ facing both sides of the brake disc 1 . In a disk brake hanger pin slip-out prevention structure in which a pin hole 26 extending in the direction of the rotational axis c of the brake disc 1 is provided for erection, and both friction pads 3 ₁ and 3 ₂ are suspended on the hanger pin 27, the hanger pin 27
An annular groove 30 ₁ is provided on the outer peripheral surface of the end protruding from the outer surface of the brake caliper 4, and a retaining plate 31 is provided on the outer surface of the brake caliper 4,
It consists of a locking piece 32 extending perpendicularly to the hanger pin 27, and a fixing piece 33 connected to the locking piece 32 and extending parallel to the hanger pin 27. The hanger pin 27 is engaged with the annular groove 30 ₁ of 27.
a U-shaped locking groove 34 that prevents axial movement;
A large diameter hole 35 is formed in the open end of the locking groove 34 and allows the hanger pin 27 to be inserted therethrough, and the fixing piece 33 is fixed to the brake caliper 4 with a screw 37 perpendicular to the hanger pin 27. A hanger pin retaining structure for a disk brake, characterized in that the tip of the screw 37 is pressed against the outer peripheral surface of the hanger pin 27 within the pin hole 26.