JP2005337327A - Drum brake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drum brake device easily hooking a terminal hooking tool of a cable on a toggle lever. <P>SOLUTION: This drum brake device 1 is provided with a toggle mechanism 10 for expanding and opening a space between one ends of a pair of brake shoes 3, 4. The toggle mechanism 10 is provided with the toggle lever 8 and a strut 9, and the terminal hooking tool 23a of the cable 23 is inserted from the back face side of a back panel 23 into the front face side and hooked on the toggle lever 8. To make it possible to insert the terminal hooking tool 23a of the cable 23 from the back face side of the back panel 2 to the front face side without inserting the terminal hooking tool 23a into a member 30 in a vehicle body side, a cable insertion hole 2d into which the terminal hooking tool 23a is inserted is formed in a position of the back panel 2 in which part of the perimeter is not covered with the member 30 in the vehicle body side when the back panel 2 and an anchor member 7 are fixed to the vehicle body side. A cable casing 21 provided on the back side of the cable insertion hole 2d is mounted on the back panel 2 without interposing the member 30 in the vehicle body side. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drum brake device. In particular, a back plate fixed to the vehicle body side, a pair of brake shoes movably mounted on the back plate, and projecting between opposite ends of the brake shoe from the back plate in the wheel rotation direction of the brake shoe An anchor member that regulates the amount of movement of the brake shoe and a toggle mechanism that widens one end of the pair of brake shoes, and the toggle mechanism pushes one brake shoe toward the drum by operating the parking brake cable. It has a toggle lever and a strut that pushes the other brake shoe toward the drum in conjunction with the toggle lever, and the cable end latch is inserted from the back side of the back plate to the front side and hooked on the toggle lever. The present invention relates to a drum brake device to be stopped.

A drum brake device described in Patent Document 1 is conventionally known.
The drum brake device described in Patent Document 1 includes a back plate and a toggle mechanism operated by a cable for parking brake.
A cable insertion hole is formed in the back plate, and a cylindrical guide member is inserted in the cable insertion hole. The toggle mechanism is arranged on the front side of the back plate. A toggle lever that pushes one brake shoe toward the drum by operating the cable, and another brake shoe that points to the drum in conjunction with the toggle lever. And has a pushing strut.
When hooking the cable to the toggle lever, first, the back plate is fixed to a member (carrier or the like) on the vehicle body side, and the guide member is inserted into an insertion hole formed in the member on the vehicle body side. And the terminal latch provided at the terminal of the cable is inserted through the guide member. As a result, the terminal latching tool penetrates the member on the vehicle body side and the back plate in the thickness direction, and is hooked on the toggle lever disposed on the front side of the back plate.
JP-A-6-337027

However, as described above, the cable end hook needs to be inserted between the vehicle body side member and the back plate. The members on the vehicle body (such as a carrier) are generally thicker than the back plate. Therefore, the insertion path of the terminal latch is long, and it may not be easy to latch the terminal latch on the toggle lever.
Then, this invention makes it a subject to provide the drum brake device which is easy to latch the terminal latch of a cable on a toggle lever.

In order to solve the above-mentioned problems, the present invention is a drum brake device having a configuration as described in each claim.
According to the first aspect of the present invention, in order to enable insertion of the cable end latch from the back side of the back plate to the front side without passing through the member on the vehicle body side, the back plate includes: When the anchor member is fixed to the vehicle body side, a cable insertion hole is formed through which the terminal hook is inserted at a position where at least a part of the entire circumference is not covered by the vehicle body side member. And the cable casing provided in the back side of the cable penetration hole is attached to the back plate without the member on the vehicle body side.

Therefore, the cable end latch is inserted from the back side of the back plate to the front side through the cable insertion hole formed in the back plate, without being inserted through the body side member (for example, carrier, knuckle, etc.). Is done. Thus, the insertion path of the terminal latch is shortened, and the terminal latch is easily latched on the toggle lever.
Further, the back side of the cable insertion hole is covered by a cable casing that is attached to the back plate without a member on the vehicle body side. Therefore, the cable insertion hole can be easily and reliably covered with the cable casing.

According to the second aspect of the present invention, the anchor member is provided with a plurality of anchor attachment portions that penetrate from the front surface of the back plate to the back surface and are attached to the vehicle body side member. The vehicle body side member has a plurality of mounting holes through which each of the plurality of anchor mounting portions is inserted, and one end edge side of the vehicle body side member to expose the cable insertion holes positioned between the plurality of anchor mounting portions. To a plurality of mounting holes, a cut portion formed in a cut shape is provided.
Therefore, the cable insertion hole is exposed by the cut portion. The member on the vehicle body side is cut from one end edge side by the cut portion. Therefore, by using the cut portion, the terminal hook can be inserted into the cable insertion hole of the back plate while looking through the cable insertion hole. Thus, the cable can be inserted into the cable insertion hole without being affected by the thickness of the member on the vehicle body side.

According to the invention described in claim 3, the back plate is formed with a space portion with the anchor member provided on the surface side of the back plate by being squeezed to the back side toward the cut portion of the vehicle body side member. An aperture portion is formed. In the throttle portion, the head of the casing mounting bolt is disposed in the space, and the leg of the casing mounting bolt penetrates from the front surface to the back surface of the throttle portion, and the cable casing is attached to the leg portion. It has become.
Therefore, the casing mounting bolt can be attached to the head between the back plate and the anchor member by forming a throttle portion on the back plate. Therefore, the head of the casing mounting bolt can be disposed on the surface side of the back plate without providing a recess in an anchor member or the like that requires strength.

According to the invention described in claim 4, the cable casing is provided with one mounting hole into which the leg portion of the casing mounting bolt is inserted, and a protruding portion that protrudes toward the cable insertion hole and is inserted into the cable insertion hole. It has been.
Therefore, the cable casing is supported at two points with respect to the back plate by one mounting hole and the protruding portion. In this state, the nut can be tightened to the leg portion of the casing mounting bolt into which the mounting hole is inserted. Therefore, the cable casing can be attached to the back plate by a single nut tightening operation. Thus, the cable casing can be easily attached to the back plate.

According to the fifth aspect of the present invention, the cable casing is detachably attached to the back plate in a state where the back plate is attached to the member on the vehicle body side.
Therefore, the cable can be inserted into the cable insertion hole of the back plate in a state where the back plate is attached to the vehicle body side member and the cable casing is not attached to the back plate. The cable casing can then be attached to the back plate. Thus, it is easy to insert the cable into the cable insertion hole.

An embodiment according to the present invention will be described with reference to FIGS.
The drum brake device 1 is a drum-in-disc brake device as shown in FIGS. 1 and 2, and has a disc brake that generates a braking force by a pad 20 on the outer periphery, and a parking drum brake in the center. Yes.
As shown in FIG. 1, the drum brake of the drum brake device 1 includes a disc-like back plate (backing plate) 2 fixed to the vehicle body side, and a pair of brake shoes 3 movably mounted on the back plate 2. , 4.

Between the opposite lower ends of the brake shoes 3 and 4, a toggle mechanism 10 that widens one end of the brake shoe, a return spring 11 that elastically biases one end in the proximity direction, and a back plate An anchor member 7 is provided that restricts the amount of movement of the brake shoes 3 and 4 in the wheel rotation direction by projecting from one end to the other end.
Between the opposite upper ends of the brake shoes 3 and 4, there are an adjuster 12 for adjusting the distance between the upper ends of the brake shoes and a return spring 13 that is elastically biased in a direction in which the upper ends are brought close to each other. Is provided.

A dust cover 14 is attached to the back side of the back plate 2 as shown in FIG. A disk member 26 is attached to the front side of the back plate 2, and the disk member 26 integrally includes a drum 26 b and a disk 26 c.
A cable insertion hole 2 d is formed in the back plate 2. A parking brake cable 23 is inserted from the back side to the front side of the back plate 2 through the cable insertion hole 2 d and connected to the toggle mechanism 10. A cable casing 21 is attached to the back surface of the back plate 2 at a position behind the cable insertion hole 2d.

As shown in FIG. 1, the back plate 2 has a donut disk shape and has a central hole 2 b through which the axle is inserted. An attachment portion 2a is formed around the central hole 2b, and the attachment portion 2a is fixed to the attachment portion 30a of the carrier (vehicle body side member) 30 shown in FIG.
The brake shoes 3 and 4 include webs 3a and 4a extending in a crescent shape along the outer periphery of the back plate, and a standing portion 3b standing on the webs 3a and 4a along the outer peripheral edges of the webs 3a and 4a. , 4b. And the linings 5 and 6 are provided in the outer peripheral surface of standing part 3b, 4b.

As shown in FIG. 1, hook portions 3e and 4e to which the adjuster 12 is hooked are formed on one end side of the webs 3a and 4a. The adjuster 12 adjusts the distance between the brake shoes 3 and 4 and the drum (15b shown in FIG. 3) by adjusting the distance between the upper ends of the webs 3a and 4a.
Overhang portions 3c and 4c and latching portions 3d and 4d are formed on one end side of the webs 3a and 4a.
The overhang portions 3 c and 4 c extend toward the anchor member 7. Therefore, when the brake shoes 3 and 4 rotate in the wheel rotation direction, the overhang portions 3c and 4c come into contact with the anchor member 7 to restrict the movement amount in the wheel rotation direction.
The latching portions 3d and 4d are latched with respect to the toggle lever 8 or the stat 9 of the toggle mechanism 10 laid horizontally between them.

  As shown in FIG. 3, the anchor member 7 is provided with a plurality of (for example, two) stat bolts (anchor attachment portions) 16 and 17. The stat bolts 16, 17 have a head portion that is attached to the surface of the anchor member 7, and leg portions that penetrate the anchor member main body and the back plate 2. The leg portions of the stat bolts 16 and 17 are inserted into mounting holes 30c and 30d formed in the carrier 30, and nuts 24 and 25 are attached to the tips thereof. Thus, the anchor member 7 is fixed to the carrier 30 via the plurality of stat bolts 16 and 17.

As shown in FIG. 4, the toggle mechanism 10 includes a toggle lever 8, a stat 9, and a guide member 18.
The toggle lever 8 is plate-shaped, has a latching portion 8a on one end side, and has a connecting portion 8c and an engaging groove 8b on the other end side.
A terminal hook 23a provided at the end of the cable 23 is hooked to the hook 8a. The connecting portion 8c is slidably connected to one end side of the stat 9 through the inserted pin 10a. The engaging portion 8d of the brake shoe 3 is engaged with the engaging groove 8b.

The toggle lever 8 is sandwiched between two plate-like stats 9.
A connecting portion 9a connected to the toggle lever 8 is formed on one end side of each stat 9, and an engaging groove 9b is formed on the other end side to engage the latching portion 4d of the brake shoe 4. Has been.
The lower edge of the stat 9 and the lower edge of the toggle lever 8 are in sliding contact with the upper surfaces of the heads of the stat bolts 16 and 17, respectively.

  As shown in FIG. 4, the guide member 18 is made of a leaf spring material, and includes a mounting portion 18a that is attached to the toggle lever 8, and a guide portion 18b that goes around the latching portion 8a from the mounting portion 18a. Yes. The guide part 18 b guides the terminal latch 23 a inserted from the direction of arrow I to the latch part 8 a of the toggle lever 8. Therefore, the terminal latch 23a can be latched with respect to the latching portion 8a simply by being inserted toward the toggle lever 8.

The back plate 2 has a throttle portion 2c as shown in FIG. A cable insertion hole 2d is formed in the throttle portion 2c.
The throttle portion 2 c has a throttle shape in which a part of the back plate 2 is narrowed to the back side, and forms a space portion between the surface side of the back plate 2 and the seating surface of the anchor member 7. In the space portion, as shown in FIG. 2, a head portion 15a of the casing mounting bolt 15 is disposed.
The casing mounting bolt 15 has a head portion 15a welded to the surface of the throttle portion 2c, and a leg portion 15b penetrating the throttle portion 2c. The cable casing 21 is inserted into the leg portion 15b, and the nut 22 is attached. Thus, the cable casing 21 is attached to the casing attachment bolt 15.

As shown in FIG. 3, the carrier 30 is formed with a plurality of mounting holes 30c, 30d and one notch 30e. The cut portion 30e is formed in a cut shape from one end edge side of the carrier 30 to between the plurality of mounting holes 30c, 30d. The notch 30e opens the cable insertion hole 2d and the back side of the cable casing 21 as shown in FIG. In other words, the cable insertion hole 2d and the cable casing 21 are provided in a region of the back plate 2 where at least a part of the entire circumference is not covered with the carrier 30 by the cut portion 30e.
The throttle portion 2c of the back plate 2 swells to the back side along the cut portion 30e. The cable casing 21 is directly attached to the throttle portion 2c without the carrier 30 interposed therebetween.

As shown in FIGS. 6 and 7, the cable casing 21 includes a main body portion 21 a, a cylindrical portion 21 b, and a protruding portion 21 c.
The main body 21a is plate-shaped and has a mounting hole 21d at a position closer to the lower side. As shown in FIG. 2, the mounting hole 21 d is formed in a through hole shape, and is inserted into the leg portion 15 b of the casing mounting bolt 15.
The cylindrical portion 21b extends from the main body portion 21a to the back side, and the protruding portion 21c protrudes from the main body portion 21a to the front side. The cylindrical portion 21b and the protruding portion 21c are each cylindrical and have a hollow portion through which the cable 23 is inserted. As shown in FIG. 4, the cable casing 21 is attached to the back plate 2 in a state where the protruding portion 21 c is inserted into the cable insertion hole 2 d.

As shown in FIG. 2, the disk member 26 has a mounting portion 26a, a drum 26b, and a disk 26c integrally.
The attachment portion 26a is formed in a donut disk shape on the center side, and is attached to the axle side. The drum 26b is formed in a cylindrical shape extending from the outer peripheral edge of the mounting portion 26a toward the back plate 2, and generates braking force by pressing the brake shoes 3 and 4 against the inner surface. The disk 26c is formed in a donut disk shape near the outer peripheral edge, extends from the outer peripheral surface of the drum 26b to the outer peripheral side, and generates a braking force by pressing the pad 20 shown in FIG.

  As shown in FIG. 1, the dust cover 14 is substantially donut-shaped, and has a notch 14a at a portion where the pad 20 is attached. As shown in FIG. 2, the dust cover 14 is attached to the back surface side of the back plate 2, and mud etc. is formed from the back surface side of the back plate 2 to the front surface side by covering the back plate 2 and the back surface side of the disk member 26. Prevent entry.

Next, a method for attaching the drum brake device 1 will be described.
First, as shown in FIG. 2, the back plate 2 to which the brake shoes 3 and 4 are attached is fixed to the carrier 30.
Next, the cable 23 is inserted from the back side to the front side of the back plate 2 through the cable insertion hole 2d, and the terminal hook 23a of the cable 23 is hooked on the toggle lever 8 (see FIG. 4).
Next, as shown in FIG. 2, the protruding portion 21c of the cable casing 21 is inserted into the cable insertion hole 2d, and at the same time, the mounting hole 21d is inserted into the leg portion 15b of the casing mounting bolt. Then, the nut 22 is attached to the leg portion 15b.
Then, the disk member 26 is attached to the axle.

The drum brake device 1 is formed as described above.
That is, when the back plate 2 and the anchor member 7 are fixed to the carrier 30 as shown in FIG. 4, the terminal latch 23 a is provided at a position where at least a part of the entire circumference is not covered by the carrier 30. A cable insertion hole 2d through which is inserted is formed. A cable casing 21 provided on the back side of the cable insertion hole 2d is attached to the back plate 2 without the carrier 30 interposed therebetween.

Therefore, the terminal hook 23 a of the cable 23 is inserted from the back side to the front side of the back plate 2 through the cable insertion hole 2 d formed in the back plate 2 without being inserted through the carrier 30. Thus, the insertion path of the terminal latch 23a is shortened, and the terminal latch 23a is easily latched on the toggle lever 8.
The cable insertion hole 2d is covered on the back side by a cable casing 21 that is attached to the back plate 2 without the carrier 30 interposed therebetween. Therefore, the cable insertion hole 2 d can be easily and reliably covered with the cable casing 21.

  As shown in FIG. 4, the anchor member 7 is provided with a plurality of (for example, two) stat bolts (anchor attachment portions) 16 and 17 that penetrate the back plate 2 from the front surface to the back surface and are attached to the carrier 30. As shown in FIG. 5, the carrier 30 has a plurality of mounting holes 30 c and 30 d through which the plurality of stat bolts 16 and 17 are inserted, and a cable insertion hole 2 d located in the plurality of stat bolts 16 and 17. In order to do so, a notch 30e formed in a notch shape is provided between the plurality of mounting holes 30c and 30d from one end edge side of the carrier 30.

  Accordingly, the cable insertion hole 2d is exposed by the cut portion 30e. The carrier 30 is cut from one end edge side by a cut portion 30e. Therefore, by using the cut portion 30e, the terminal hook 23a can be inserted into the cable insertion hole 2d while looking through the cable insertion hole 2d of the back plate 2. Thus, the cable 23 can be inserted into the cable insertion hole 2d without being affected by the thickness of the carrier 30.

As shown in FIG. 5, the back plate 2 is narrowed to the back side toward the notch 30 e of the carrier 30 as shown in FIG. 5, so that it is between the anchor member 7 provided on the front side of the back plate 2 as shown in FIG. 2. An aperture 2c that forms a space is formed. In the throttle portion 2c, the head portion 15a of the casing mounting bolt 15 is disposed in the space, the leg portion 15b of the casing mounting bolt 15 penetrates from the front surface to the back surface of the throttle portion 2c, and the cable is connected to the leg portion 15b. The casing 21 is configured to be attached.
Therefore, the casing mounting bolt 15 can have the head portion 15 a attached between the back plate 2 and the anchor member 7 by forming the throttle portion 2 c on the back plate 2. Therefore, the head 15a of the casing mounting bolt 15 can be disposed on the surface side of the back plate 2 without providing a recess in the anchor member 7 or the like that requires strength.

As shown in FIG. 2, the cable casing 21 has one mounting hole 21d into which the leg portion 15b of the casing mounting bolt 15 is inserted, and a protruding portion that protrudes toward the cable insertion hole 2d and is inserted into the cable insertion hole 2d. 21c is provided.
Therefore, the cable casing 21 is supported at two points with respect to the back plate 2 by one mounting hole 21d and the protruding portion 21c. In this state, the nut 22 can be tightened to the leg portion 15b of the casing mounting bolt 15 into which the mounting hole 21d is inserted. Therefore, the cable casing 21 can be attached to the back plate 2 by a tightening operation of one nut 22. Thus, the cable casing 21 can be easily attached to the back plate 2.

The cable casing 21 is detachably attached to the back plate 2 with the back plate 2 attached to the carrier 30 as shown in FIG.
Therefore, the cable 23 can be inserted into the cable insertion hole 2 d of the back plate 2 in a state where the back plate 2 is attached to the carrier 30 and the cable casing 21 is not attached to the back plate 2. The cable casing 21 can then be attached to the back plate 2. Thus, it is easy to insert the cable 23 into the cable insertion hole 2d.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and may be the following form.
(1) In the above embodiment, the drum brake device is attached to the carrier. However, the drum brake device may be attached to a member on the vehicle body side such as a knuckle.
(2) In the above embodiment, as shown in FIG. 4, the cable is attached in a substantially vertical direction with respect to the back plate. However, the cable may take any form as long as it is a so-called right-angle pull type drum brake device that is inserted in the thickness direction of the back plate from the back side to the front side of the back plate. It may be in the form of being inserted into the surface side.

It is a front view of a drum brake device. FIG. 2 is a cross-sectional view taken along arrow AA in FIG. 1. It is a front view of a carrier (member on the vehicle body side). It is the arrow BB sectional view taken on the line of FIG. It is a partial rear enlarged view of the drum brake device around the cable insertion hole in a state where the drum brake device is attached to the carrier. It is a side view of a cable casing. It is a rear view of a cable casing.

Explanation of symbols

1 ... Drum brake device 2 ... Back plate (backing plate)
2c ... Drawing part 2d ... Cable insertion hole 3,4 ... Brake shoe 7 ... Anchor member 8 ... Toggle lever 9 ... Stat 10 ... Toggle mechanism 12 ... Adjuster 14 ... Dust cover 15 ... Casting bolts 16, 17 ... Stat bolt ( Anchor mounting part)
21 ... Cable casing 21c ... Projection 21d ... Mounting hole 23 ... Cable 23a ... Terminal hook 26 ... Disc member 26b ... Drum 26c ... Disc 30 ... Carrier (member on the vehicle body side)

Claims (5)

A back plate fixed to the vehicle body side, a pair of brake shoes movably mounted on the back plate, and a wheel rotation of the brake shoe protruding from the back plate between opposite ends of the brake shoe An anchor member that regulates the amount of movement in the direction, and a toggle mechanism that widens one end of the pair of brake shoes, and the toggle mechanism moves the one brake shoe by operating a cable for a parking brake. A toggle lever that pushes toward the drum, and a strut that pushes the other brake shoe toward the drum in conjunction with the toggle lever, and the terminal latch of the cable is from the back side to the front side of the back plate A drum brake device that is inserted into the hook and is latched on the toggle lever,
The back plate and the anchor member are provided on the back plate so that the cable end latch can be inserted from the back side of the back plate to the front side without passing through the vehicle side member. A cable insertion hole through which the terminal latch is inserted at a position where at least a part of the entire circumference is not covered by the vehicle body side member when fixed to the side, and the back side of the cable insertion hole A drum brake device, wherein a cable casing provided on the back plate is attached to the back plate without any member on the vehicle body side. The drum brake device according to claim 1,
The anchor member is provided with a plurality of anchor attachment portions that penetrate from the front surface of the back plate to the back surface and are attached to the vehicle body side member.
The vehicle body side member includes a plurality of mounting holes through which each of the plurality of anchor mounting portions is inserted and a cable insertion hole positioned between the plurality of anchor mounting portions. The drum brake device is provided with a cut portion formed in a cut shape from one end edge side to the plurality of mounting holes. The drum brake device according to claim 2,
The back plate is formed with a narrowed portion that forms a space portion with the anchor member provided on the surface side of the back plate by being narrowed to the back side toward the notch portion of the member on the vehicle body side,
A head portion of a casing mounting bolt is disposed in the space portion in the throttle portion, a leg portion of the casing mounting bolt penetrates from the front surface to the back surface of the throttle portion, and a cable casing is attached to the leg portion. A drum brake device characterized in that it is configured. The drum brake device according to claim 3,
The cable casing is provided with one mounting hole into which a leg portion of the casing mounting bolt is inserted, and a protruding portion that protrudes toward the cable insertion hole and is inserted into the cable insertion hole. Brake device. The drum brake device according to any one of claims 1 to 4,
A drum brake device, wherein the cable casing is detachably attached to the back plate in a state where the back plate is attached to a member on the vehicle body side.

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