JPH0230381Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a negative pressure booster used in vehicles and the like, particularly to one that assists the operation of a clutch or brake master cylinder.

Conventionally, a check valve assembly of this type is fitted into the opening of a shell defining a negative pressure chamber via a sealing member, and a negative pressure conduit is connected to the check valve assembly. There is.

However, in the conventional check valve assembly, the check valve assembly rotates, causing vibrations and vibrations that occur when the vehicle is running.
There was a problem in that the negative pressure conduit fluctuated greatly due to impact or the like, leading to damage or decreased durability. also,
If the assembly rotates easily, there is a problem in that workability during installation on an actual vehicle decreases.

For this reason, it is necessary to apply a rotation stopper to the check valve assembly, but there is a problem that a rotation stop that simply engages has a weak ability to prevent rotation and cannot sufficiently prevent rotation. be.

The present invention was made in view of these problems, and aims to provide a negative pressure booster that can sufficiently prevent the check valve assembly from rotating.
To achieve this purpose, a base plate fixed by welding to the shell outer wall near the check valve assembly and a protrusion formed protruding from the check valve assembly are capable of engaging with each other.

An embodiment of the present invention will be described below with reference to the drawings.

In FIGS. 1 and 2, 10 indicates the entire negative pressure booster, and the interior of the shell 13 consisting of a front shell wall 11 and a rear shell wall 12 is communicated through passages 16 and 17 by a movable wall 14 and a diaphragm 15. It is divided into a negative pressure chamber A and a high pressure chamber B, and a preload spring 18 is interposed between the movable wall 14 and the shell front wall 11. This booster 10 normally introduces negative pressure into both chambers A and B, and for example, when the operating rod 19 linked to the brake pedal is driven forward against the elasticity of the first spring 20. , valve piston 2
1 slides forward and pushes the push rod 23 via the reaction plate 22, and the valve member 24 moves forward under the action of the second spring 26 integrally formed with the first spring 20, pushing the valve seat 27. The valve piston 2 is brought into contact with the valve piston 2 to cut off the negative pressure chamber A and the high pressure chamber B.
1 advances, the valve piston 21 is removed from the valve member 24.
This is a type in which the atmosphere is introduced into the high pressure chamber B by separating the chamber. 28 is a filter, and 29 is a boot.

Reference numeral 30 denotes a check valve assembly, which has a thin plate-like projection 32 that projects laterally from the base of the valve hole wall 31, as shown in an enlarged view in FIG. 33 is a valve body, 34 is a valve spring, and 35 is a joint for connecting a negative pressure pipe.

Shell front wall 11 of shell 10 of negative pressure booster
An opening 101 for attaching the check valve assembly 30 is formed therein, and one end of a substrate 36 is fixed by welding such as spot welding. A screw hole is formed at the other end of this substrate 36.

As shown in an enlarged view in FIG. 3, the check valve assembly 30 has a sealing member 37 fitted to the valve hole wall 31 and press-fitted into the opening 101 of the shell 10. It is connected to the other end of the substrate 36 with a screw 38.

Therefore, even if rotational force is applied to the check valve assembly 30, the rotation of the check valve assembly 30 is prevented by the substrate 36.

In this embodiment, the protrusion 32 of the check valve assembly 30 is screwed to the base plate 36, and the base plate 36 is fixed to the outer wall of the shell, so that the check valve assembly 30 and the base plate 36 may be disconnected from each other. Since the check valve assembly 30 is replaced with a screw, this connection can be made without damaging the base plate 36 when the check valve assembly 30 is replaced. I can solve it.

In this way, in the present invention, the check valve assembly is connected to the shell outer wall via the substrate to prevent rotation of the check valve assembly, so that the direction of the negative pressure conduit is changed when the vehicle is running. Since there is no fluctuation, damage to the negative pressure conduit and decrease in durability can be prevented, and workability during installation on an actual vehicle can be improved. In particular, in the present invention, since the substrate is fixed to the shell outer wall by welding,
By simply changing the welding position of the substrate to the shell outer wall, the mounting direction of the check valve assembly can be changed, and the mounting direction of the negative pressure conduit relative to the check valve assembly can be changed to any desired direction. Therefore, various mounting directions can be changed without changing the shape of the shell or the check valve assembly, so parts can be shared.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view of an embodiment of the negative pressure booster according to the present invention, Fig. 2 is a front view of the above embodiment, and Fig.
The figure is an enlarged sectional view of the main part of the above embodiment. 10... Ciel, 30... Check valve assembly, 32
... Protrusion, 36 ... Substrate, 101 ... Opening.

Claims (1)

[Scope of utility model registration request] In a negative pressure booster, a check valve assembly is fitted into an opening of a shell defining a negative pressure chamber via a sealing member, and a negative pressure conduit is connected to a joint of the check valve assembly. A negative pressure booster in which a substrate fixed to an outer shell wall near the check valve assembly by welding and a protrusion formed protruding from the check valve assembly can be engaged with each other.