JPH038524Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to a lateral vibration control device for a reservoir of a master cylinder.

b. Prior Art Conventionally, this type of master cylinder has a pair of oil supply ports 2 and 3 in a cylinder body 1, as shown in FIG.
A pair of communicating tubular portions 6 and 7 on the lower surface of the reservoir 5 are inserted into the reservoir 5 with a grommet seal 4 interposed therebetween. For details, see the grommet seal 4 as shown in Figure 5.
An annular engagement groove 8 is formed on the outer periphery of the oil supply port 2 , and this engagement groove 8 fits into an annular engagement projection 9 formed on the inner periphery of the oil supply ports 2 and 3 . On the other hand, a hook-shaped portion 10 is provided at the lower end of the communicating tubular portions 6 and 7 of the reservoir 5.
is formed, and this hook-shaped portion 10 engages with the lower opening edge of the grommet seal 4.

c Problems to be solved by the invention The reservoir 5 of the master cylinder is attached to the cylinder body 1 as described above, but this reservoir 5 is resistant to vibrations and shocks in the longitudinal direction (horizontal direction in Fig. 4). Although it is relatively strong, it is generally weak against vibrations in the left-right direction (front-to-back direction in Fig. 4, left-right direction in Fig. 5), and is generally weak against vibrations of a certain magnitude or more from the left and right directions on the reservoir 5. In this case, as shown by the arrow in FIG. 5, a force is applied to pull out the reservoir 5 upward, and there is a risk that the communicating tubular portions 6 and 7 may unexpectedly come off from the oil supply ports 2 and 3. Therefore, in practice, it is necessary to take measures such as reinforcingly fastening the cylinder body 1 and the reservoir 5 with screws 11, and such measures increase the number of steps required to assemble the master cylinder. There was also the problem of increased manufacturing costs. Furthermore, when the horizontal amplitude of the reservoir 5 increases, the grommet seal 4
There was also a problem that its durability deteriorated due to excessive deformation of the material.

The present invention was devised in view of the above-mentioned circumstances, and its purpose is to prevent horizontal vibration of the reservoir with an extremely simple structure without using complicated fastening means such as screws. The purpose of the present invention is to provide a lateral vibration control device that is capable of controlling lateral vibration.

The gist of the present invention is to provide a master cylinder in which a pair of connecting tubular portions on the lower surface of the reservoir are inserted into an integral oil supply port of the master cylinder body with a grommet seal interposed therebetween. The reservoir of the master cylinder is characterized in that the reservoir extends toward both sides of the master cylinder main body in a direction that forms a . It's in the lateral vibration control device.

d. Means for Solving the Problems An embodiment of the present invention will be described below with reference to FIGS. 1 to 3. As shown in FIG. 1, the master cylinder is composed of a master cylinder body 1 and a reservoir 5. A pair of oil supply ports 2 and 3 are provided on the upper surface of the cylinder body 1, and a pair of oil liquid discharge ports 15 and 16 are provided on the side surface of the cylinder body 1. Grommet seals 4 are provided on the inner periphery of the pair of oil supply ports 2 and 3, as in the conventional example shown in FIG.
are fitted, and the communicating tubular portions 6, 7 of the reservoir 5 are forcibly inserted into the inner periphery of the grommet seal 4.

The upper surface of the cylinder body 1 at the intermediate portion of the pair of oil supply ports 2 and 3 and the lower surface of the reservoir 5 facing thereto are each formed to be raised in a convex shape. These convexly raised portions 1a, 5
a extends in a direction substantially perpendicular to the axis of the master cylinder body 1 and toward both sides of the master cylinder body 1, and brings the opposing surfaces of both sides close to each other so that the restriction portion 17 is placed therein. , 18 respectively. In particular, a portion of the regulating portion 17 utilizes the boss 19 of the oil discharge port 16 and has a flat upper surface. In addition, the regulation part 17,1
The direction 8 does not necessarily have to be exactly perpendicular to the axis of the cylinder body 1, and may be arranged somewhat obliquely. It is preferable that the lengths of the regulating parts 17 and 18 extend as far as possible from the straight line connecting the pair of oil supply ports 2 and 3, and if necessary, as described above, In addition to being used as a part of the regulating part 17, the regulating part 18 on the reservoir 5 side may be extended as shown by the chain line in FIG. 3 in correspondence with this.

e Function The lateral vibration regulating device for the reservoir 5 of the master cylinder is constructed as described above, and when the reservoir 5 is slightly tilted due to a force acting on the reservoir 5 in the left-right direction in FIG. 3, the pair of regulating parts 17, 18 are in contact with each other. Therefore, the degree of inclination of the reservoir 5 is suppressed, and generation of a strong component of force to pull out the reservoir 5 upward is avoided, thereby making it possible to prevent the reservoir 5 from coming off. Further, since the degree of deformation of the grommet seal 4 can be suppressed to a small level, deterioration of the grommet seal 4 over time can be reduced and its durability can be improved.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in various ways. For example, in the above embodiment, the pair of restricting parts 17 and 18 are formed linearly and parallel to each other as shown in FIG. Therefore, the intermediate portions of the regulating portions 17 and 18 may be concave, and in this case, material costs and weight can be reduced.

f. Effects of the invention As described above, the invention is provided with a pair of restricting parts that extend in a direction substantially perpendicular to the axis of the master cylinder body and are close to each other on the surface of the master cylinder body facing the reservoir. Therefore, when the reservoir tries to tilt in the left-right direction, the ends of the pair of regulating parts come into contact with each other, thereby suppressing the degree of inclination of the reservoir, and thus preventing the generation of a strong component force that pulls the reservoir upward. It is possible to prevent the reservoir from coming off. Furthermore, since the reservoir does not tilt significantly, the degree of deformation of the grommet seal can be reduced, and its durability can be improved. Furthermore, since the present invention has an extremely simple structure that only includes a pair of regulating parts on the opposing surfaces of the cylinder body 1 and the reservoir 5, it does not require an increase in the number of man-hours required for assembling the master cylinder. Since the number of parts does not increase unlike the fastening means such as the above, it can be realized at low cost.

[Brief explanation of the drawing]

Figures 1 to 3 show one embodiment of the present invention, in which Figure 1 is a vertical sectional view of the master cylinder, Figure 2 is a plan view of Figure 1, and Figure 3 is a cross-sectional view of the master cylinder. It is a cross-sectional view taken along the line - in the figure. 4 is a longitudinal cross-sectional view of a conventional master cylinder, and FIG. 5 is a cross-sectional view taken along the line -- in FIG. 4, showing a state in which the reservoir is tilted. DESCRIPTION OF SYMBOLS 1... Master cylinder main body, 2, 3... Oil supply port, 6, 7... Communication tubular part, 17, 18... Regulating part.

Claims (1)

[Scope of utility model registration request] In a master cylinder in which a pair of connecting tubular portions on the lower surface of the reservoir are inserted into a pair of oil supply ports of the master cylinder body through a grommet seal, the master cylinder body and a part of the reservoir are connected to the master cylinder body. It extends in a direction substantially perpendicular to the axis of the master cylinder body, and extends toward both sides of the master cylinder body, and the opposing surfaces of both side walls are brought close to each other, and restriction portions are provided thereon. Master cylinder reservoir lateral vibration control device.