JPS609091Y2 - master cylinder - Google Patents

Description

[Detailed Description of the Invention] The present invention is a hydraulic pressure generation source for a brake or a clutch mounted on a vehicle, etc., and relates to a mask cylinder equipped with a reservoir joint.

Generally, when a reservoir for storing working fluid for a mask cylinder is provided at a location separate from the mask cylinder, the reservoir and the fluid generating chamber of the mask cylinder are communicated via a pipe.

At this time, one end of the piping is connected to the reservoir, and the other end is connected to the reservoir joint connected to the mask cylinder, but the reservoir joint connected to the mask cylinder is required to have various characteristics. There is.

In other words, the direction in which the piping is attached to the reservoir joint must be changeable in various directions, the fluid-tight seal between the reservoir joint and the mask cylinder must be sufficiently achieved, and the air must be vented from the piping system after the piping is connected. Characteristics such as ensuring a sufficient connection between the reservoir joint and the mask cylinder when hydraulic fluid is pumped are required.

In order to satisfy these characteristics, various reservoir joint coupling structures or means have been proposed in the past, but in order to satisfy these characteristics, the conventional structures have become complicated, and the reservoir joints have been made too complicated. A problem arises in that the work of joining the mask cylinder itself becomes complicated.

In addition, most of the recent reservoir joints are made from high-resistance resin materials, and when a threaded part is formed on the reservoir joint and screwed onto the mask cylinder, cracks tend to occur in the threaded part. There is a problem in that it causes leakage of hydraulic fluid and reduces reliability.

The present invention was developed in view of the above problems, and provides a mask cylinder that satisfies the above-mentioned characteristics with a simple structure, has easy connection work for the reservoir joint, and is highly reliable. The purpose is to

The above objects, according to the present invention, include a cylinder body, a protrusion provided in the cylinder body and having a hole communicating with the inside thereof, and a protrusion fitted into the hole via a sealing member, a reservoir joint made of synthetic resin having a protrusion that abuts a part of the upper end surface; a first pressing part that abuts the upper surface of the protrusion and has a pair of protrusions that protrude downward; A second pressing part that comes into contact with the other part of the upper end surface, and a holding member having a screw insertion hole between the first pressing part and the second pressing part, and a screw is inserted into the screw insertion hole of the holding member. The first pressing part presses the projection of the reservoir joint, the pair of projections bite into the projection of the reservoir joint, and the second pressing part presses the projection of the reservoir joint. The other part of the upper end surface of the protruding part is pressed, and together with this, the protruding part of the reservoir joint is pressed between the first pressing part and a part of the upper end surface of the protruding part. A mask cylinder, characterized in that the reservoir joint is fixed to the protrusion;
distantly related to

Hereinafter, an embodiment of the present invention applied to a tandem master cylinder will be described with reference to the drawings.

Fig. 1 is a partially sectional side view of a tandem master cylinder according to an embodiment of the present invention, Fig. 2 is a plan view of a part of the mask cylinder shown in Fig. 1, and Fig. 3 is an exploded view of the main parts. FIG.

In the figure, the entire tandem master cylinder is indicated by 1, and a pair of boss parts 3, 3 are provided at the upper part of the cylinder body 2 of the tandem master cylinder 1 with a space therebetween.

The boss parts 3, 3 each have a main part 5 provided with an inner hole 4 that communicates with a hydraulic pressure generating chamber in the cylinder body 2, and a main part 5.
A sub-portion 6 which is provided integrally with the main portion 5 and extends upward from the main portion 5.
A flat guide surface 7 is provided at the outer periphery of the boundary area between both parts 5.6 (see FIG. 2).

A supply hole 8 and a return hole 9 are bored at the bottom of the inner hole 4, and the inner hole 4 communicates with the hydraulic pressure generating chamber in the master cylinder body 2 through these holes 8 and 9, respectively.
, 9 and their relationship with each other are the same as those of a conventional tandem master cylinder, so a detailed explanation thereof will be omitted in this section.

Note that the pair of left and right boss portions 3, 3 and their related parts are exactly the same on the left and right, so corresponding parts will be given the same reference numerals.

The reservoir joint 10, the shape of which is clearly seen in FIG. It has a flange part 12 integrally formed on the upper part of this insertion part 11, and a head part 13 integrally formed above this flange part 12, and the flange part 12 and the head part 13 A piping connection part 14 extends outward from a part of the peripheral side of the piping part 14, and an inverted S-shaped liquid passage 15 extends from the piping connection part 14 to the lower end of the insertion part 11. It is formed.

Note that a cylindrical protrusion 16 is integrally formed at the upper end of the head 13.

The holding member 17 is made of metal, for example, and is attached to the sub-portion 6 of the boss portion 3.
It is fixed to the boss part 3 by a bolt 18 that is screwed into the boss part 3, but this is fixed to the boss part 3 by a flat part 19 that engages with the bolt 18.
and is provided continuously on this plane portion 19, for example, with a cross section V.
The first part is formed with a pair of protrusions 20 facing downward in the shape of a letter.
A joint portion 21 as a pressing portion and a cylindrical projection 16 of the reservoir joint 10 formed upward from the joint portion 21.
The plane part 19 has a curved part 23 having a hole 22 for externally fitting into the boss part 3, a guide part 24 which is further bent and faces the guide surface 7 of the boss part 3, and a sub part 6 which is bent. A support part 25 is formed as a second pressing part that comes into contact with the upper end of the support part 25 .

A groove 26 is formed on the outer peripheral surface of the insertion portion 11 of the reservoir joint 10, and a sealing member 27 is attached to the groove 26.

The tandem master cylinder 1 is further formed with a pair of holes 28 for attaching it to a vehicle body.

The reservoir joint 10 according to an embodiment of the present invention and the presser member 17 for fixing it to the cylinder body 2 are constructed as described above.
0 to the cylinder body 2 will be explained.

First, the sealing member 27 is attached to the groove 26 of the insertion part 11 of the reservoir joint 10, and then the insertion part 11 is fitted into the inner hole 4 of the boss part 3 so that the flange part 12 is a part of the upper end surface of the boss part 3. A reservoir joint 10 is arranged so as to come into contact with the upper end surface of a certain main portion 5.

Next, the cylindrical projection 16 of the reservoir joint 10 is fitted into the hole 22 of the curved portion 23 of the presser member 17, and the presser member 17 is moved so that the guide portion 24 of the presser member 17 faces the guide surface 7 of the boss portion 3. It is placed on the boss part 3.

At this time, the pair of protrusions 20 of the joint part 21 of the holding member 17 abut against the upper surface of the flange part 12 of the reservoir joint 10.
Further, the support portion 25 is in contact with the upper end surface of the subsidiary portion 6, which is the other portion of the upper end surface of the boss portion 3.

Furthermore, the direction of the piping connection part 14 of the reservoir joint 10 is
It is made to coincide with a predetermined direction (in the illustrated example, it is oriented in the direction A as seen in FIG. 2).

Finally, the bolt 18 is screwed into the screw hole of the sub-portion 6 of the boss portion 3.

Then, the holding member 17 is fixed to the boss part 3 by the bolt 18, and at the same time, the holding member 17 is fixed to the boss part 3 by the bolt 18, and the bolt 1
7, the joint part 21 of the presser member 17 is pressed toward the flange part 12 of the reservoir joint 10, and the flange part 12 is pressed against the upper end surface of the main part 5 of the boss part 3 by the joint part 21. You will be under pressure.

At this time, the pair of protrusions 20 of the joint part 21 bite into the upper surface of the flange part 12 while partially deforming it, so when the bolt 18 is fully screwed together, the reservoir joint 10 joins the presser member 17. At the same time that the flange portion 12 is pressed and fixed to the upper end portion of the main portion 5 of the boss portion 3 by the portion 21,
It is firmly coupled to the cylinder body 2 with rotation prevention.

In the above connection work, the reservoir joint 10 was connected to the cylinder body 2 so that the direction of the piping connection part 14 of the reservoir joint 10 was in the axial direction A of the cylinder body 2 as shown in FIG. From the structure of the reservoir joint 10 and the holding member 17 described above, it is clear that the direction of the piping connection part 14 of the reservoir joint 10 can be changed to directions B and C perpendicular to the axial direction A of the cylinder body.

That is, in this embodiment, the direction of the piping connection part 14 can be freely set over a range of 180 degrees from B to C.

Further, since the sealing member 27 is installed in the groove 26 of the insertion portion 11 of the reservoir joint 10, the sealing between the inner circumferential surface of the inner hole 4 of the boss portion 3 and the insertion portion 11 is reliably performed.

Furthermore, according to the embodiment of the present invention, since no threaded portion is formed in the reservoir joint 10, there is a very small possibility that cracks will occur unlike in conventional reservoir joints having threaded portions. The reliability of the joint with the main body is further improved.

Further, when the reservoir joint 10 is connected to the cylinder body 2, the presser member 17 and the boss portion 3 are connected to the presser member 1.
By the guide part 24 of 7 and the guide surface 7 of the boss part 3,
Since the relative position is configured to be constant, the holding member 17 does not move following the screwing of the bolt 18, and the hole 22 of the curved portion 23 of the holding member 17 is aligned with the reservoir joint 10. Because it fits into the cylindrical projection 16 of
Not only is the movement of the holding member 17 further prevented, but even if some external force is applied to the reservoir joint 10 via the piping connected to the piping connection part 14 after the reservoir joint 10 is connected, the reservoir joint 10 Since the reservoir joint 10 is fixed at two points, the joint portion 21 and the curved portion 23 of the holding member 17, the entire reservoir joint 10 does not tilt excessively from a predetermined position, improving safety.

Even when hydraulic fluid is pumped, a considerable force acts on the holding member 17 via the reservoir joint 10, but since the guide portion 24 functions as a reinforcing member, the holding member 17 is easily deformed.
It is unbreakable and has excellent reliability.

Furthermore, when fixing the presser member 17 to the boss part 3 with the bolts 18, it is possible that a considerable stress acts on the support part 25 and deforms the support part 25. Since the position of the upper end face is higher than the position of the upper end face of the main part 5 and the distance between the flat part 19 of the presser member 17 and the upper end face of the sub part 6 is reduced, the height of the support part 25 is The strength of the small supporting portion 25 is sufficient even if the entire holding member 17 is formed from a relatively thin plate material, and there is no problem in terms of strength or durability of the parts.

According to the embodiment of the present invention, various effects can be achieved with a simple structure as described above, and in particular, the entire operation of connecting the reservoir joint 10 can be performed in a simple procedure, which improves the work efficiency.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various modifications can be made based on the technical idea of the present invention.

For example, in the above-described embodiment, the level of the upper end surface of the secondary section 6 of the boss section 3 is the level of the reservoir joint 1 which is brought into contact with the upper end surface of the main section 5.
A support part 25 with a height equal to S is formed integrally with the flat part 19, and the bolt 18 is lower than the level of the upper end surface of the flange part 12 of the sub part 6. When screwing into the screw hole, the support part 25 is pressed against the upper end surface of the sub-part 6, but this support part 25 is omitted and the left end part in the drawing of the flat part 19 is designated as the second pressing part, and the sub-part The left end portion of the flat portion 19 may be pressed against the upper end surface of the secondary portion 6 when the bolt 18 is screwed into the screw hole of the secondary portion 6 .

In this case, the level of the upper end surface of the flange portion 12 of the reservoir joint 10 that is in contact with the upper end surface of the main portion 5 of the boss portion 3 is equal to or slightly higher than the level of the upper end surface of the secondary portion 6. A height of 6 is determined.

Even in this case, it is clear that the reservoir joint 10 can be fixed to the cylinder body 2 by screwing the bolt 18 into the threaded hole of the sub-portion 6.

Further, in the above-described embodiment, the base of the piping connection part 14 is located in the boundary area between the flange part 12 and the head part 13, and the flange part 12 is not formed in a perfect circular shape. Alternatively, the base portion of the piping connection portion 14 may be located completely above the flange portion 12 at the head portion 3, and the flange portion 12 may be formed into a completely circular shape.

In this case, the holding member 17 has a configuration in which the curved portion 23 is omitted in the above-described embodiment, and the flange portion 12 is pressed by the joint portion 21 when the bolt 18 is screwed into the secondary portion 6. , the direction of the piping connection 14 is approximately 360 degrees.
Can be adjusted within a range of degrees.

Further, in the above embodiment, by screwing the bolt 18 into the secondary part 6, the joint part 21 of the presser member 17 is pressed against the flange part 12 of the reservoir joint 10, thereby fixing the reservoir joint 10 to the cylinder body 2. The curved portion 23 is configured to guide the protrusion 16 of the head 13 of the reservoir joint 10 through its hole 22, but instead of this, the curved portion 23 also guides the head 13 downward. It may be configured to press.

In this case, for example, the curved portion 23 is configured to have a downwardly inclined shape, and its elastic force allows the reservoir joint 10 to
to the cylinder body 2.

In this case, the curved portion 23 has an auxiliary fixing action to the joint portion 21, but its fixing force acts along the axis of the insertion portion 11 and flange portion 12 of the reservoir joint 10. Therefore, it is very effective.

As mentioned above, according to the mask cylinder of the present invention,
It has a simple structure that satisfies various required characteristics, and it is easy to connect the reservoir joint to the cylinder body, maintains stability against vibrations and external forces, and has excellent reliability. It has various effects, and its practical value is extremely high.

[Brief explanation of drawings]

FIG. 1 is a partial cross-sectional side view of a mask cylinder according to an embodiment of the present invention, FIG. 2 is a plan view of a portion of the mask cylinder, and FIG. 3 is an exploded perspective view of essential parts of the mask cylinder. In the figure, 2... cylinder body, 3...
... Boss part, 10 ... Reservoir joint, 12
...Flange part, 17... Pressing member,
18... Bolt, 19... Flat part.

Claims (1)

[Scope of utility model registration request] A cylinder body, a protrusion provided in the cylinder body and having a hole communicating with the inside thereof, and a protrusion fitted into the hole via a sealing member and abutting a part of the upper end surface of the protrusion. a reservoir joint made of synthetic resin, a first pressing part that contacts the upper surface of the protruding part and has a pair of protrusions that protrude downward, and a second pressing part that contacts the other part of the upper end surface of the protruding part. and a holding member having a screw insertion hole between the first pressing part and the second pressing part, and a screw is inserted into the screw insertion hole of the holding member and screwed and tightened to the protrusion. As a result, the first pressing part presses the protruding part of the reservoir joint, the pair of protrusions bite into the protruding part of the reservoir joint, and the second pressing part presses the other part of the upper end surface of the protruding part. The protruding portion of the reservoir joint is pressed between the first pressing portion and a portion of the upper end surface of the protruding portion, thereby fixing the reservoir joint to the protruding portion. A mask cylinder characterized by: