JPS61287845A - Disc brake device for compact vehicle - Google Patents

Abstract

PURPOSE:To easily replace a friction pad, by forming an opening through which a friction pad member is permitted to be removed toward an axle at a bottom wall of a friction pad member mounting space in a caliper body. CONSTITUTION:A hydraulic caliper together with a disc plate D is arranged inside a left front fork 40L and is supported to a front axle 10. A caliper body 24 is formed in a U-shape in such a manner as to straddle the disc plate D from its inner peripheral side. A pair of front and rear openings 31B are formed at a bottom wall 30 of a friction pad member mounting space 28 in the caliper body 24. A longitudinal width of the openings 31B is substantially equal to a width of friction pad members 34.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a disc brake device for small vehicles such as motorcycles and tricycles.

7-1 In a disc brake device that brakes the wheel by pressing a disc plate fixed to the wheel hub between the friction pad members of the caliper, the pads of the friction pad members wear out due to repeated use over a long period of time. Therefore, it is necessary to replace the friction pad member at an appropriate time.

However, if the caliper straddles the disc plate i~ from the outer circumferential side, the amm para member must be moved in the axle direction and removed from the caliper body, but the main 11 liper straddles the disc plate from the inner circumferential side. In the straddling type, the friction pad member must be removed in the radial direction. At that time, make sure that the wheel rim located on the outside of the caliper does not interfere with the friction pad member as shown in Figures 1 and 2.
Consideration as shown in the figure is required.

That is, in the illustrated example in FIG. 1, the protruding piece 03 of the wheel width portion 01 that supports the disc plate D protrudes largely in the width direction of the rim 02, so that the *m pad member 05.05 of the caliper 04 is When removing it from the body, interference with the wheel rim 02 can be avoided. Also,
In the example shown in FIG. 2, the distance between the protrusions of the protruding pieces 03a is small, but the protruding positions are moved closer to the axle, the diameter of the disc plate 1-0 is reduced, and the caliper body and wheel rim 0
Friction pad member 0 with a margin of -1 minute for the interval 2a
5a and 05a can be extracted.

However, in the case of front sound, the width of the wheel increases and that! 1
1! There is a problem in that this causes an increase in e and the amount of protrusion of the brake pad in the wheel width direction increases.In the latter case, since the diameter of the disc plate D is small, it is disadvantageous in obtaining the desired braking torque.

An object of the present invention is to provide an ice brake device in which the caliper straddles the disc plate from the inner circumferential side (inner straddle type), while keeping the width of the wheel including the caliper sufficiently small.
The point is to increase the diameter of the disc plate.

The purpose of this is to create a space on the bottom wall of the friction pad member installation space of the caliper body that straddles the disc plate in a U-shape in a caliper straddling type disc brake device, so that the friction pad member can be pulled out by moving it toward the shaft side. This is achieved by forming a .

Dog 1Jfl Hereinafter, an embodiment of the present invention shown in FIGS. 3 to 5 will be described.

FIG. 3 is a schematic diagram showing the disc brake device 20 installed on the front wheel 12 inside the left front fork 40L of a motorcycle, as seen from the left side of the vehicle body with the front fork removed. FIG. 4 is a schematic diagram showing the disc brake system 2!20 together with a left front fork 401, and FIG. 5 is a schematic cross-sectional view of this as seen from the front side of the vehicle body.

A disk plate D is screwed to the lower ends of the left and right front forks 40L and 40R, connecting these to each other and supporting the front width shaft 10. In addition, the front axle 10 is equipped with a disc brake device δ2 along with a disc plate D.
A hydraulic caliper 22 constituting 0 is located inside the left front fork 401 and is swingably supported.

The caliper 22 is of an opposed type.
Two sets formed in the caliper body 24,
Each of the four caliper cylinders 26 has a key of 1? A rib screw 1-32 is inserted and retracted so that the caliper piston 32 presses the back surface of two sets of friction pad members 34 supported by a hanger bin 36.

Further, the caliper body 24 is shaped to straddle the disc plays 1 to D from the inner peripheral side in a U-shape, and the J!
! Two pairs of openings 31A and 31B are formed in the front of the bottom wall 30 of the rubbing pad member installation space 28. The opening 31
A, 31B is a para member 34 whose width in the front direction is *mm.
．． 34, and the friction pad member 34.
34 can be pulled out or inserted along the openings 31A, 31B.

The caliper body 24 is a two-part body, and its base side 24Δ and opposing side 24B are aligned at a plane Δ and are integrally connected using three connecting bolts 25. Further, a friction pad member 3 is provided at the base of the caliper body 24.
A large window 24C through which 4 can pass is formed.

Furthermore, a telescopic front fork 401 is positioned further outward than the caliper 22 from the vehicle body. is formed mainly of a bottom case 44 and a fork vibrator 42 that is slidably fitted into the bottom case 44. A protruding piece 46 is integrally provided on the back surface of the bottom case 44, and the protruding piece 46 A connecting rod 90 is swingably supported on the piece 46 at its upper end 92. The upper end 92 of the connecting rod 90 has a bifurcated shape, and the upper end 92 is connected to the protruding piece 4.
A screw 96 that is screwed into the upper end portion 92 in such a manner as to sandwich G from both the left and right sides thereof passes through the support opening of the protruding piece 46. Therefore, the connecting rod 90 can swing in the front direction of the vehicle body using the screw 96 as a support shaft.

Further, the tip of the screw pin 98 that is screwed into the screw hole formed at the middle i1 of the connecting rod 90 is connected to the caliper cylinder 2.
6. In question 26, it is fitted into the caliper body 24.

The lower end portion 94 of the connecting rod 90 is formed into a bifurcated shape,
A screw 100, which passes through an opening formed in an operating piece 74 of the contraction movement restricting device 10 (described later), whose outer end is located between the two forks, is screwed into the lower end 94.

Next, the internal structure of the front fork 40L and the contraction motion regulating device attached to the front fork 40L @7
0 will be explained.

The lower end of the seat pipe 48 is fixed to the inner lower end of the bottom case 44 with a screw 50, and a cylindrical partition fitting 52 is fixed to the bottom of the bottom case 44 due to its attachment. The upper end portion (not shown) of the seat pipe 48 is connected to the fork pipe 42 with iF! Freely movable and oil-tightly fitted.

The B chamber defined by the bottom case 44 and the seat pipe 48 and the C chamber in the pipe 48 to the sea 1 are filled with buffer oil, but when the front fork 40L expands and contracts, the bottom case 44 Opening 54 formed. An opening 56 formed in the bottom case 44 of the cylinder chamber E1 and the chamber F1 of the contraction motion regulating device 10. An annular path 58 defined by the bottom case 44 and the partition fitting 52. Partition metal fittings 5
2 and an opening 62 formed in the sea 1-via 48.
The buffer oil will flow from the chamber to the C chamber or from the C chamber to the B chamber.

Further, a contraction movement restriction device 70 is provided on the back surface of the upper end of the bottom case 44, and the contraction movement restriction device 10 is
A housing 1 is oil-tightly screwed and fixed to a seat surface formed in a bottom case 44 and defines a cylinder chamber E and a chamber F.
2, an operating piece 74 whose inner end is connected to the cylindrical screws 1 to 16, a compression coil spring 18 that urges the operating piece 74 in the backward direction, and a rubber cover (boot) 8G. ,
A raised portion 44A formed on the front surface of the upper end of the bottom case 44 and having an opening 54A1 and a bypass oil passage 58A therein.
The flow is inserted into the bypass oil passage 5JIA, has a plurality of orinois having different diameters, and is rotated by the grip portion 77a, with the adjustment orifice member 17 as the main body. When the piston 76 comes into contact with the wall surface of the bottom case 44 in the vicinity of the opening 54, the main communication oil passage is cut off and the selected orifice member 77 inserted into the bypass oil passage 58A is closed. Chamber B and chamber C communicate with each other through the orifice.

This embodiment is constructed as described above, and when braking, pressure oil is discharged from the hydraulic master cylinder and the hydraulic pressure in the Kitoriba cylinder chamber increases, each caliper piston 32 moves forward, and the two sets of It! The ta pad member 34 slides along the hanger bin 36 and rubs and presses the disk plate D rotating in the direction of arrow G. The rotational force of the caliper 22 around the front axle 10 generated by this Ha force is transmitted to the connecting rod 90 via the screw pin 98, and the connecting rod 90 swings in the direction of arrow 1'' about the screw 96 as a support shaft. The operating piece 74 connected to the lower end 94 of the connecting rod 90 via the screw 100 is pushed, and its tip, ie, the piston 76, comes into contact with the wall surface of the bottom case 44. In this way, the braking torque generated between the disc plate D and the friction pad member 34 is transferred to the bottom case 4 via the connecting rod 90.
4 to the protruding piece 46 and the peripheral wall of the opening 54,
The desired braking takes place.

Then, the piston 16 of the contraction motion regulating device @70 moves forward and comes into contact with the wall surface of the bottom case 44, whereby the opening 54→cylinder chamber E→chamber F→interval 56→annular path 58→
As a result of the main communication oil passage from the opening 60 to the opening 62 being blocked,
Even though the fork vibrator 42 receives a force that tries to move further into the case 44, the [
7 oil gradually flows into the C chamber through the selected orifice of the orifice member 71 with a large flow path resistance,
Front lift A4 (IL) cannot be contracted rapidly and the sinking of the front of the vehicle body is effectively restricted.

Therefore, in this embodiment, although the caliper 22 is of the internal straddling type, the hanger bin 36 is Removed friction pad member 34.3
4 to the front axle 10 side through the openings 31A and 31B, and then taken out to the outside through the window 24A, and a new friction pad member 34 can be installed by reversing the procedure. Even if the disc plate D is formed to have a sufficiently large diameter and the caliper 22 is spaced apart from the front axle 10, the rim 16 will still be large! 2 without interfering with the removal of the pad member 34, and a large braking I
・The front middle wheel assembly including the front fork 1 to the fork can be made narrower by 3゜l by reducing the distance between the front fork 40L and the front wheel 12 by ~1 minute. As is clear from the above description, in the present invention, in a caliper straddling type disc brake device, a friction pad is installed on the bottom wall of the friction pad member installation space of the caliper body that straddles the disc plate in a U-shape. Since we have formed an opening that allows the member to be removed by moving it toward the axle, please consider interference with the wheel rim when removing and installing the J9 rubbing pad member! +! By making the diameter of the disc plate attached to the width of the middle wheel sufficiently large, the caliper can be moved far away from the axle, thereby obtaining large braking torque. By locating the caliper on the inside, the width of the wheel assembly including the caliper can be set small, and the unsprung weight can be reduced.

[Brief explanation of drawings]

Figures 1 and 2 are schematic cross-sectional views showing the relationship between a known inner straddle type 1 caliper and a wheel, respectively, and Figure 3 is a schematic cross-sectional view showing the relationship between a known inner straddle type caliper and a wheel, and Figure 3 shows a caliper located on the inside of a motorcycle. Fig. 4 is a schematic diagram showing the disc brake V device together with the left front fork, and Fig. 5 is a schematic diagram showing the disc brake device J3 and the left side front fork. It is a schematic cross-sectional view of the left side front 1-F taken from the front side of the vehicle body. 10... Front axle, 12... Front wheel, 14... Width part, 16... Rim, 18... ... Projection piece, 20... Disc brake device, 22... Caliper, 24... Caliper body, 24C... Window, 25... Connection bolt,
26... Caliper cylinder, 28... Friction pad member arrangement space, 30... Bottom wall, 31A, 31B...
・Opening 32...Caliper piston, 34...*12
Pad member, 36...hanger bin, 40m,
40R...Front fork, 42...Fork vibe, 44...Bottom case, 46...Protruding piece, 4
8... Sheet pipe, 50... Screw, 52... Partition fitting, 54... Opening, 56... Opening, 58...
・Annular path, 60...opening, 62...opening, 70...
- Contraction motion regulating device, 72... housing, 74...
Operating part, 76... Piston, 77... Orifice member, 78... Compression coil spring, 80... Cover tube, 90... Connection rod, 92... Upper end portion, 94...
]・End part, 96...Screw, 98...Screw bottle, 10
009. Screw.

Claims (1)

[Claims] In a small vehicle equipped with a disc brake device in which a caliper straddles a disc plate fixed to a wheel hub from the inner peripheral side, a friction pad member is provided in a caliper body that straddles the disc plate in a U-shape. A disc brake device for a small vehicle, characterized in that an opening is formed in the bottom wall of the space so that the friction pad member can be removed by moving it toward the axle.