JPS6212489A - Car-body front sinking preventive device for minicar - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

The present invention utilizes the braking torque of the brake to prevent the phenomenon (nose dive phenomenon) in which the front fork contracts and the front of the vehicle body sinks during braking in motorcycles and tricycles. This invention relates to a device for preventing sinking of the front part of a single batting body.・'j8 In motorcycles and three-wheeled motorcycles, when a telescopic front fork consisting of a fork vibrator and a bottom case that slide against each other in the axial direction is used to support the front wheel, the inertia force is reduced during braking. This causes the front fork to sink as the front fork contracts. In order to prevent this phenomenon, that is, the nose dire phenomenon, various types of anti-sinking devices (
Anti-nose dia device) has been proposed. As an example, as disclosed in Japanese Unexamined Patent Application Publication No. 59-49587, there is known a mechanism that uses a plurality of link members to transmit braking torque to the operating part of the contraction motion regulating means. However, when the link member Ia is used, the structure becomes complicated and the number of parts increases, which causes an increase in vehicle manufacturing costs. SUMMARY OF THE INVENTION An object of the present invention is to provide a device for preventing the front body of a small vehicle from sinking, which has a simplified operating mechanism. The purpose of this is to have a caliper swingably supported on the front axle in a small vehicle equipped with a telescopic front fork with a built-in reducing force generation mechanism and a disc brake device for braking the front wheels. A connecting rod is provided on a protruding piece protruding from the back of the bottom case at an outer position so as to be swingable in the longitudinal direction of the vehicle body, and the intermediate portion of the connecting rod is swingably connected to the caliper using a shaft member. This is achieved by tightening the connecting rod and connecting the tip end of the connecting rod to the operating part of the contraction movement restricting means. According to such a configuration, during braking, the braking torque that swings the caliper toward the front of the vehicle body using the front axle as a fulcrum is transmitted to the connecting rod via the shaft member, and the connecting rod is connected to the bottom case rear surface. It swings forward of the vehicle using the connection point with the protruding part as a fulcrum. As a result, the moving shaft piece is pushed by the lower end of the connecting rod, the contraction movement regulating means is operated, the main communication oil passage of the reducing force generation mechanism is disconnected, and the contraction movement of the front fork is restricted. . Point JLJI Hereinafter, an embodiment of the present invention shown in FIGS. 1 and 2 will be described. Figure 1 shows the left front 1-fork 30L of a motorcycle.
The contraction motion regulating means 60 accompanying this is shown as a schematic side view with main parts cut away, and FIG. 2 shows this as a schematic cross-sectional view as seen from the front side of the vehicle body. Left and right foot fork 301-. A front axle 10 is supported at the lower end of the 3OR by interconnecting them.
A disk plate D is screwed onto the side surface of a hub 14 of a front wheel 12 rotatably supported by the front axle 10. Further, on the front axle 10, a hydraulic caliper 20, which together with the disc plate D constitutes a disc brake device, is swingably supported so as to be located inside the left front leaf A-30L. Caliper 20ha, opposed type (opp
(Osed type) and 1 mo caliper body 2
Caliper pistons 24 are fitted into and retractably into two sets of four caliper cylinders 23 formed in FIG. seems to be pressing down. The left and right front forks 3OL and 30R are of a telescopic type, but since it is the left front fork 301 that is equipped with the vehicle body front sinking prevention device according to the present invention, the front fork 30L will be described below. The front fork 30L is formed mainly of a bottom case 34 and a noak vibe 32 that is slidably fitted into the bottom case 34. bottom case 3
A protruding piece 36 is integrally provided on the back surface of the connecting rod 4, and a connecting rod 70 is swingably supported by the protruding piece 36 at its upper end 72. The upper end 12 of the connecting rod 10 has a bifurcated shape, and the upper end 12 connects the protruding piece 36 to its left side.
A screw 76 that is inserted into the upper end portion 72 from both right sides passes through the support hole of the protruding piece 36 into which the cylindrical body 78 is inserted. Therefore, the connecting rod 70 can freely swing in the longitudinal direction of the vehicle body using the screw 76 as a support shaft. In the opening formed in the middle part of the connecting rod 70,
A cylinder 80 whose inner wall shape has an oval cross section (symbol A@Sho) is press-fitted and fixed, and a circle n84 is fitted into the cylinder 80 via a pair of O-rings 82, and the circle n84 is roughly inserted into the cylinder body. An arm member 2 extending from 22 so as to straddle the connecting rod 70
A screw 86 passing through 2a and through the cylinder 84 in a tight fit is screwed into the caliper body 22 between the caliper cylinders 23 and 23. Further, the lower end portion 74 of the connecting rod 70 is formed into a bifurcated shape, and a cylinder 88 and a flange are attached to an opening formed in the operating piece 64 of the contraction motion regulating means 60 described later, with the outer end thereof being located between the bifurcated portions. A cylinder 90 is fitted and a screw 9 passes through the cap.
2 is screwed onto the lower end portion 74 of the fork. Next, the internal groove jΔ of the front 1-fork 3OL and the contraction motion regulating means 60 attached to the front 1-fork 3OL will be explained. The lower ends of the seats 1 to 38 are fixed to the inner end of the bottom case 34 with screws 40, and the partition fittings 42 are fixed to the bottom of the bottom case 34 by means of screws 40. The upper end (not shown) is slidably and oil-tightly fitted into the fork pipe 32.The B chamber is defined by the bottom case 34 and the seat pipe 38, and the seat pipe 38 When the front fork 3OL expands and contracts, the opening 44 formed in the bottom case 34, the cylinder chamber E of the contraction motion regulating means 60, and the connection formed in the bottom case 34 are filled with buffer oil. The mi oil flows from chamber B to chamber C, or from chamber C to chamber B, through a main communication oil path consisting of the passage 46, the opening 48 formed in the partition fitting 42, and the opening 50 formed in the sheet pipe 38. In addition, contraction movement restriction means 60 are attached to the back and front surfaces of the upper end of the bottom case 34, and the contraction movement restriction means 60
a housing 62 that is oil-tightly screwed and fixed to a seat surface formed in the bottom case 34 and defines a cylinder chamber E;
An operating piece 64 whose inner end is made into anti-dive screws 1 to 66, a compression coil spring 68 that biases the operating piece 64 in the backward direction, and a rubber IJ 10 cylinder (boot) 69. A protrusion 34△ is formed on the lower end 1fff surface of the bottom case 34 and has an opening 44△ and a bypass oil passage 46A inside the raised part 34△, and a plurality of orifices having different diameters are inserted into the bypass oil passage 46△. At the same time, it is formed with a main body consisting of a flow & maintenance A refrigeration member 67 which is rotated by its gripping portion 67a. The anti-dive piston 66 moves forward and opens [around the periphery of 144].

[If the pull-bottom case 34 comes into contact with the wall surface, the main seat oil passage is cut off, and the 8th chamber and the C chamber are connected to each other through the selected orifice of the orifice 67 fitted into the bypass oil passage 46A. We will communicate. The present embodiment is configured as described above, and when pressure oil is discharged from the hydraulic master cylinder to the brake 115 and the hydraulic pressure in the caliper cylinder chamber increases by 1, each of the -r pistons 1 to 24 moves forward. Two sets of 12 cooling pad members 2G slide and displace along the hanger pin 28, and rub and press the disc plate D rotating in the direction of arrow F. This I
! i! Caliper 2 around the front axle 10 caused by frictional force
The rotational force of 0 is transmitted to the connecting rod 70 via the screw 86, and the connecting rod 70 swings in the direction of arrow G about the screw 76, and is applied to the lower end 14 of the connecting rod 10 via the screw 92. The connected operating piece 64 is moved, and its tip, ie, the anti-dia piston 66, comes into contact with the wall surface of the bottom case 34. In this way, the braking torque generated between the disc plate D and the friction pad members 26 is transmitted to the protruding piece 96 J3 of the bottom case 34 and the wall around the frontage 44 via the connecting rod 70, and desired braking is performed. Then, as the anti-dive piston 66 of the contraction motion regulating means 60 moves forward and comes into contact with the wall surface of the bottom case 34, the main communication oil passage consisting of the cylinder 44 → cylinder yE → communication passage 46 is changed to '1M1g1'. , despite the force exerted by the cup pipe 32 to move further into the bottom case 34, the buffer oil in chamber B gradually flows through the selected orifice of orifice G7 under great flow resistance. Because it flows into the C chamber, the front fork 30
L cannot be rapidly contracted, effectively preventing the front of the vehicle from sinking. The reason why the shape of the inner wall of the cylinder 80 is oval in cross section is as follows.
This is to ensure that the caliper 20 and the connecting rod 70 swing at different centers of swing. In addition, by changing the set angle θ) in the long diameter direction of the ellipse with respect to the center line of the connecting rod 70, the pressing force of the screw 86 on the connecting rod 70 and its direction of action can be changed, and the connecting rod 70 with respect to the operating part halo 4 can be changed. The pressing force can be changed, and the ratio of the axial distance fna between the screws 76 and 86 and the axial distance between the screws 86 and 92 can be changed, or the 7-inch
There is no need to adjust the surface pressure vA of the anti-dia piston 6G by changing the diameter of the dive piston 66, which has the advantage of increasing the degree of freedom in design. Furthermore, the dynamic mechanism of the contraction motion regulating means 60 using a single connecting rod 70 has a simpler structure and fewer parts than conventional ones, so it is possible to improve the efficiency of vehicle assembly and manufacturing. We aim to reduce costs. As is clear from the above description, in the present invention, in a small vehicle equipped with a telescopic front fork and a disc brake device for braking the front Q1 wheel, a caliper is swingably supported on the front axle, A connecting rod is provided on a protruding piece protruding from the back of the bottom case at a position outward from the outer periphery of the disc plate, and the intermediate portion of the connecting rod is attached to a caliper so as to be swingable with a shaft member. and the tip of the connecting rod is connected to the operating part of the contraction motion regulating means provided on the fork, so that the swinging force of the caliper due to braking is transferred to the operating part as the swinging force of the connecting rod. As a result, the main communication oil passage of the damping force generating mechanism is 'a'ffi' by the operation of the contraction motion regulating means, thereby regulating the contraction motion of the front fork. In this way, the structure in which the displacement of the caliper is transmitted to the contraction motion regulating device using the wooden connecting rod is simple and achieves a reduction in the number of parts, a reduction in the weight of the vehicle body, and a reduction in manufacturing costs. I can do it.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view of the main part of the left front 1-) A- of a motorcycle equipped with a contraction movement regulating means according to an embodiment of the present invention, and FIG. It is a schematic sectional view. DESCRIPTION OF SYMBOLS 10... Front axle, 12... Front wheel, 14... Hub, 20... Caliper, 22... Caliper body, 2
3... Caliper ring - 124... 1 spear piston, 26... friction pad member, 28... hanger bin, 3OL, 30R... front fork, 32
...Fork pipe, 34...Bottom case, 36
--Protruding piece, 38... Sheet pipe, 40... Screw, 42... Partition fitting, 44... Opening, 46...
・Communication path, 48...frontage, 50...opening, 60...
- Contraction motion regulating means, 62... housing, 64...
Operating part, 66...Anti-dive piston, 67
... Orifice member, 68 ... Compression coil spring, 69 ... Cover tube, 10 ... Connection rod, 72 ... Upper end, 74 ... Lower end, 76 ... Screw, 78 ...・・・
Cylindrical body, 80... Cylindrical body, 82... O-ring, 84
... cylinder, 86 ... screw, 88 ... cylinder, 90.
...Cylinder with flange, 92...Screw. Agents: Patent attorney Ehara and Mogai 2.h'
- Sanji City 11 Masami - I: 1986? Month 4H Special ii' to Director General Tadashi 1) Akio Tono 1st grade 111 display 1lfl, nl 60 years +r 9T petition No. 12
No. 8006 2, Title of invention Mid-term suspension of small vehicles 1) ri
Part subsidence prevention device 3 Supplementary information 1! I f7) Relationship special <1'! li M
1 person Address: Minami 15yama 2-chome, Mixed-ku, Tokyo [11-1 Name (532) Honda Motor Co., Ltd. Substitute and Koreshi Kume 4, Representative Person Address: 2-3 Toranomon, Minato-ku, Tokyo No. 3, No. 6, Number of inventions increased by amendment None 7. Pair of amendments (1) On page 2, line 18, [JP-A-59-119587] is corrected to ``JP-A-58-49587.'' (2) [Schematic sectional view seen from the gravity side] on page 4, line 13
[Corrected to [Cross-sectional view of main parts viewed from the back side 1]] (3) "Schematic cross-sectional view of the bamboo sword seen from the side" on page 12, lines 4 and 5 is replaced with "cross-sectional view of the main part of the bamboo sword from the back side"
I will correct it. (II) Drawings Figures 1 and 2 in the original drawings of the application were replaced with attached drawings.

Claims (1)

[Scope of Claims] A telescopic front fork with a built-in damping force generation mechanism, which blocks the main communication oil passage of the damping force generation mechanism during braking to prevent contraction of the front fork consisting of a fork pipe and a bottom case. In a small vehicle equipped with the front fork equipped with a contraction movement regulating means and a disc brake device for braking the front wheels, a caliper is swingably supported on the front axle, and the caliper is supported outwardly from the outer periphery of the disc plate. A connecting rod is provided on a protruding piece protruding from the rear surface of the bottom case at a position such that the connecting rod can swing freely in the longitudinal direction of the vehicle body, and the intermediate portion of the connecting rod is connected to the caliper so as to be swingable with a shaft member, and A device for preventing sinking of a front part of a vehicle body of a small vehicle, characterized in that a tip end of the connecting rod is connected to an operating part of the contraction motion regulating means.