JP3049964U - Fluid pressure equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To obtain a fluid pressure device which reduces processing cost. SOLUTION: A main body 100 having an inner hole 100a 'having a circular cross section, a cylinder main body having a circular cross section supported by a part of the main body 100 inserted into the inner hole, and a lid for covering an open end of the main body. A body 50 and sealing means mounted on the outer periphery of the lid 50, and the sealing means allows the outside and the inside of the inner hole 100 a ′ of the main body 100 to be fluidly isolated from each other on both sides thereof. In the hydraulic pump, the open end of the main body 100 is plastically deformed, and the plastically deformed portion 100c is pressed against the end of the lid 50 'to form the sealing means.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to a fluid pressure device.

[0002]

[Prior art]

 At present, various anti-skid brake devices using a hydraulic pump have been developed to prevent a vehicle from skidding. An example of this is an anti-skid brake device as shown in FIG. In FIG. 2, a drive rod of a brake pedal 2 is connected to a booster portion of a master cylinder 1 with a booster, that is, a booster unit 3. The hydraulic pressure is generated in two hydraulic pressure generating chambers in the cylinder body 4. In the cylinder body 4, a reservoir 5 for integrally storing a brake hydraulic fluid is mounted.

[0003] Pipelines 7a and 7b are connected to both hydraulic pressure generating chambers of the cylinder body 4, and one of the pipelines 7a is connected to a right front wheel 15a and a left rear wheel via various members described later. The wheel cylinder 16a is connected, and the wheel cylinders of the left front wheel 15b and the right rear wheel 16b are connected to the other pipeline 7b via similar members. That is, in the conventional example, the X pipe is employed.

[0004] Since the same members are connected to the two systems by the same structure, only one system, that is, a member connected to the pipe 7a side will be described (note that the corresponding system of the other system is not included). Structural members are given the suffix b instead of the suffix a). Wheel cylinders of the wheels 15a and 16a are connected to the pipe 7a via supply valves 11a and 12a. These wheel cylinders are connected to discharge valves 13a and 14a, and their discharge ports are connected to a slack pipe. In this conventional example, they are first connected to a reservoir 18a. This is configured in a known manner, and a piston 19 having a seal member 20 mounted in a main body 22 is urged upward by a spring 21 and fitted slidably. On both sides of the piston 19, an air chamber containing the above-mentioned spring 21 and a reservoir chamber for storing hydraulic fluid are defined, which are connected to the suction side of the pump section Pa of the hydraulic pump P and the pipe 6a. Connected through. Further, the discharge side of the pump unit Pa is connected to a pipe 7a via a pipe 8a.

The pump section Pa is configured as shown in FIG. 3, and the check valve 39 does not allow the flow to the pipe 6a but only the flow to the pipe 8a. The hydraulic pump unit Pa includes, for example, a piston 25 made of metal such as bearing steel (SUJ), and a cylinder body 24 having an inner hole 24a into which the piston 25 is slidably fitted. One end of the inner hole 24a of the cylinder body 24 is closed, and a discharge chamber 36 is defined on the closed side of the inner hole 24a. The discharge chamber 36 communicates with the pipeline 8a via a check valve 39. A spring 37 for pressing the piston 25 rightward is provided in the discharge chamber 36 .

On the other hand, the piston 25 reciprocates in the left-right direction in FIG. 3 by the movement of the eccentric cam 26 driven by the motor M and the pressing force of the spring 37 described above. An annular groove 25f is provided in the center of the piston 25 in the drawing, so that the suction chamber is formed in the inner hole of the cylinder body 24.46Is defined. The piston 25 is provided with a through hole 31 extending in the axial direction.36And suction chamber 46 And are in communication. The discharge chamber of the through hole 3136A valve seat 33 is formed at the end on the side. Further, a spring case 35 having a plurality of holes 38 is attached to the left end of the piston 25. In the spring case 35, a ball 32 that is detachably seated on the valve seat 33 and a spring 34 that urges the ball 32 toward the piston 25 are provided. In addition, the piston 25 slides rightward, and the discharge chamber36Discharge chamber36When the pressure in the inside becomes lower than the pressure of the pipe 6a, the ball 32 is separated from the valve seat 33 by the pressure of the pipe 6a, and the brake fluid flows from the pipe 6a. In addition, the piston 25 slides to the left,36Volume of the discharge chamber36When the pressure inside the pipe becomes higher than the pressure of the pipe line 6a, the ball 32 sits on the valve seat 33. That is, the discharge chamber36Acts as a check valve that allows only flow to

Further, seal rings 27 and 28 made of, for example, rubber are mounted on the outer periphery of the piston 25. The seal ring 27 separates the discharge chamber 36 and the suction chamber 46 from each other, while the seal ring 28 separates the suction chamber 46 from the atmosphere. That is, the seal rings 27 and 28 hold the pressure of the discharge chamber 36 and the pressure of the suction chamber 46 .

[0008] A conical opening is formed in the left end wall of the cylinder body 24, and forms a valve seat 24c of the valve ball 39a. The valve ball 39a is seated on the valve seat 24c by the valve spring 39b. The lid 50 made of aluminum is fixed to the opening end 12 of the mounting body 100 as described later, and is in contact with the end wall of the cylinder body 24. The anti-skid device includes reservoirs 18a, 18b, solenoid valves 11a, 11b, 12a, 12b, 13a, 13b, 14a, 14b, etc. as shown in FIG. 2, but these are generally made of aluminum together with the hydraulic pump P. And is integrally stored in the main body 100. FIG. 3 shows a part of such a main body 100, in which a circular stepped inner hole 100a is formed, and the above-mentioned cylinder main body 24 has rubber seal rings 98, 99 formed therein. Is inserted and inserted. However, the fixing of the lid 50 to the main body 100 is performed as follows.

That is, an annular groove is formed in the outer peripheral portion of the lid 50, a seal ring 51 is mounted on the annular groove, and fitted into the large-diameter portion 100 b of the stepped hole 100 of the main body 100. Then, an annular protrusion Q is formed by performing plastic deformation processing on the open end of the aluminum main body 100 using a caulking tool that forms an annular recess at the open end of the main body 100. Thereby, the cylinder main body 24 is prevented from falling out of the opening end of the main body 100 and the relative movement with respect to the main body 100 is prevented. To prevent this, the end opening of the main body 100 on the cam member side is fixed by step processing. The radial groove 50a formed on the inner end face of the lid 50 is for connecting the valve chamber 52 to the conduit 8a.

[0010]

[Problems to be solved by the invention]

 Forming an annular groove in the lid 50 and attaching the seal ring 51 to the annular groove increases the processing cost. In view of this, an object of the present invention is to provide a fluid pressure device which reduces processing costs.

[0011]

[Means for Solving the Problems]

 The above object is to provide a main body having an inner hole with a circular cross section, an insert having a circular cross section that is inserted into the inner hole and supported by a part of the main body, and a lid that covers an open end of the main body. A sealing device attached to the outer periphery of the lid, wherein the sealing device fluidly isolates the outside and the inside of the inner hole of the main body from each other on both sides thereof, The fluid pressure device is characterized in that an opening end of the main body is plastically deformed, and the plastically deformed portion is pressed against an end of the lid to form the sealing means.

With the above structure, it is not necessary to form an annular groove in the outer peripheral portion of the lid or attach a seal ring to the annular groove. After inserting the lid into the inner hole of the main body, the opening end of the main body is removed. The sealing means can be obtained simply by caulking with a caulking tool, so that the production cost can be greatly reduced.

[0013]

[Embodiment of the invention]

 FIG. 1 shows a first embodiment of the present invention. In the figure, parts corresponding to those in FIG. 4 are denoted by the same reference numerals, and detailed description thereof will be omitted.

That is, according to the present embodiment, an annular protruding portion 99 a having a trapezoidal cross section is formed on the outer peripheral portion of the cylinder main body 99, and the horizontal portion A and the slope portion B form a stepped hole of the main body. It is in pressure contact with the inner wall. This seals the pipeline 8a side and the pipeline 6a side. Further, no annular groove is formed in the outer peripheral portion of the lid 50 ', and therefore, no seal ring is attached, and the open end of the main body 100 made of aluminum is swaged to form an annular inner flange portion 100c. It is formed and is strongly pressed against the outer peripheral edge of the lid 50 'to obtain a sealing action. During this caulking, the lid 50 ′ presses the cylinder body 99 inward in the axial direction, but when the slope B of the annular projection 99 a contacts the step of the main body 100, that is, this step Function as a stopper, and a sealing action is reliably obtained between the inner flange portion 100c and the outer peripheral edge of the lid 50 '. Note that the conventionally formed inner flange portion Q 'at the right end for retaining is unnecessary. Furthermore, since the mounting body 100 and the lid 50 are made of the same material (aluminum), airtightness can be ensured even when the temperature changes. If different materials are used for these materials, the hermeticity will be weaker depending on the difference in thermal expansion coefficient when the temperature changes.

FIG. 2 shows a second embodiment of the present invention. As shown in FIG. 2A, the left end 150a of the lid 150 is subjected to a diameter reduction process. On the other hand, as in the first embodiment, the inner flange portion 100'p is formed by caulking a tool having an annular blade at the open end portion 100'c of the main body 100 'made of aluminum. The inner flange portion 100p is pressed against the outer peripheral portion 150aa and the step portion 150ab of the reduced diameter portion 150a of the lid 150 as shown in FIG. 2B, and a sealing action is performed on these surfaces (as indicated by the dotted line). Is obtained.

Therefore, in the present embodiment as well, there is no need to process the annular groove on the outer peripheral surface of the lid and attach the seal ring to the outer peripheral surface of the lid, thus significantly reducing the production cost. it can. Since the lid 150 is also made of the same material (aluminum) as the main body 100 ', the same effects as those of the first embodiment can be obtained. The other parts are configured in the same manner as in the first embodiment.

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

For example, although the main body 100 ′ is made of aluminum, it may be made of another material, for example, a light metal such as Cu, and a sealing effect can be obtained even if it is made of steel.

In the above description, the present invention is applied to a hydraulic pump of an anti-skid device. However, the present invention can be applied to other hydraulic devices, for example, a general valve device.

[0020]

[Effect of the invention]

 As described above, according to the fluid pressure device of the present invention, the production cost can be significantly reduced. Further, not only is the sealing ring of the lid unnecessary, but also the fixing of the lid to the main body is performed at the same time.

[Submission date] June 3, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0002

[Correction method] Change

[Correction contents]

[0002]

[Prior art]

At present, various anti-skid brake devices using a hydraulic pump have been developed to prevent a vehicle from skidding. An example of this is an anti-skid brake device as shown in FIG . In FIG. 3 , a drive rod of a brake pedal 2 is connected to a booster portion of the master cylinder 1 with a booster, that is, a booster device 3, and when the brake pedal 2 is depressed, the booster device 3 assists the drive rod. The hydraulic pressure is generated in two hydraulic pressure generating chambers in the cylinder body 4. In the cylinder body 4, a reservoir 5 for integrally storing a brake hydraulic fluid is mounted.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004] Since the same members are connected to the two systems by the same structure, only one system, that is, a member connected to the pipe 7a side will be described (note that the corresponding other system is connected to the other system). Structural members are given the suffix b instead of the suffix a). Wheel cylinders of the wheels 15a and 16a are connected to the pipe 7a via supply valves 11a and 12a. These wheel cylinders are connected to discharge valves 13a and 14a, and their discharge ports are connected to a slack pipe. In this conventional example, they are first connected to a reservoir 18a. This is configured in a known manner, and a piston 19 having a seal member 20 mounted in a main body 22 is urged upward by a spring 21 and fitted slidably. On both sides of the piston 19, an air chamber containing the above-mentioned spring 21 and a reservoir chamber for storing hydraulic fluid are defined, which are connected to the suction side of the pump section Pa of the hydraulic pump P and the pipe 6a. Connected through. Further, the discharge side of the pump unit Pa is connected to a pipe 7a via a pipe 8a. Incidentally, 90a, 90b, 91a, 91b are check valves.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

The pump Pa is configured as shown in FIG. 4 , and the check valve 39 does not allow the flow to the pipe 6a but only the flow to the pipe 8a. The hydraulic pump Pa includes a piston 25 made of a metal such as bearing steel (SUJ) , for example, and a cylinder body 24 having an inner hole 24a into which the piston 25 is slidably fitted. One end of the inner hole 24a of the cylinder body 24 is closed, and a discharge chamber 36 is defined in the inner hole 24a on the closed side. The discharge chamber 36 communicates with the pipe 8a via a check valve 39. A spring 37 for pressing the piston 25 rightward is provided in the discharge chamber 36 .

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction contents]

On the other hand, the piston 25 reciprocates in the left-right direction in FIG. 4 by the movement of the eccentric cam 26 driven by the motor M and the pressing force of the spring 37 described above. An annular groove 25f is provided in the center of the piston 25 in the drawing, and thereby a suction chamber 46 is defined in an inner hole of the cylinder body 24. The piston 25 is provided with a through hole 31 extending in the axial direction, through which the discharge chamber 36 and the suction chamber 46 communicate. A valve seat 33 is formed at the end of the through hole 31 on the side of the discharge chamber 36 . Further, a spring case 35 having a plurality of holes 38 is attached to the left end of the piston 25. In the spring case 35, a ball 32 that is detachably seated on the valve seat 33 and a spring 34 that urges the ball 32 toward the piston 25 are provided. Incidentally, the piston 25 is slid to the right, increasing the volume of the discharge chamber 36, the inside discharge chamber 36 is lower than the pressure in line 6a, unseated from the sphere 32 is the valve seat 33 by the pressure of the pipe 6a Then, the brake fluid flows from the pipeline 6a. Further, the piston 25 is slid to the left reduces the volume of the discharge chamber 36, the inside discharge chamber 36 becomes higher than the pressure in line 6a, the sphere 32 is seated on the valve seat 33. That is, it functions as a check valve that allows only the flow to the discharge chamber 36 .

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction contents]

[0008] A conical opening is formed in the left end wall of the cylinder body 24, and forms a valve seat 24c of the valve ball 39a. The valve ball 39a is seated on the valve seat 24c by the valve spring 39b. The lid 50 made of aluminum is fixed to the opening end of the mounting body 100 as described later, and is in contact with the end wall of the cylinder body 24. Anti-skid device reservoir 18a as shown in Figure 3, 18b, solenoid valves 11a, 11b, aluminum 12a, 12b, 1 3a, 13b , 14a, is provided with the like 14b, generally these with the hydraulic pump P And is housed integrally in a main body 100 composed of FIG. 4 shows a part of such a main body 100. The main body 100 has a circular stepped inner hole 100a formed therein, and the above-mentioned cylinder main body 24 is provided with a rubber seal ring 98. , 99 are inserted. However, the fixing of the lid 50 to the main body 100 is performed as follows.

[Procedure amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

That is, an annular groove is formed in an outer peripheral portion of the lid 50, a seal ring 51 is mounted on the annular groove, and is fitted into the large-diameter portion 100 b of the stepped hole 100 a of the main body 100. Then, an annular projection Q is formed by performing plastic deformation processing on the open end of the aluminum main body 100 using a caulking tool that forms an annular recess at the open end of the main body 100. As a result, the cylinder main body 24 is prevented from falling out of the opening end of the main body 100 and is prevented from moving relative to the main body 100. To prevent this, the end opening of the main body 100 on the cam member side is fixed by stepping. The radial groove 50a formed on the inner end surface of the lid 50 is for connecting the valve chamber 52 to the conduit 8a.

[Procedure amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

[0013]

[Embodiment of the invention]

Figure 1 shows a first embodiment of the present invention, the same reference numerals are given to portions corresponding to the conventional 4 in FIG, detailed description thereof will be omitted.

[Procedure amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction contents]

That is, according to the present embodiment, an annular protrusion 99 ′ a having a trapezoidal cross section is formed on the outer peripheral portion of the cylinder main body 99 ′. It is in pressure contact with the inner wall surface of the hole. This seals the pipeline 8a side and the pipeline 6a side. Also, no annular groove is formed in the outer peripheral portion of the lid 50 ', so that no seal ring is attached, the opening end of the main body 100 made of aluminum is caulked, and the annular inner flange portion 100c is formed. Is formed, and is strongly pressed against the outer peripheral edge of the lid 50 'to obtain a sealing action. During this caulking, the lid 50 ′ presses the cylinder body 99 ′ inward in the axial direction, but the slope B of the annular projection 99 ′ a comes into contact with the step of the body 100, that is, The step portion functions as a stopper, and a sealing action is reliably obtained between the inner flange portion 100c and the outer peripheral edge of the lid 50 '. Note that the conventionally formed inner flange portion Q 'for preventing the right end from being removed is unnecessary. Furthermore, since the mounting body 100 and the lid 50 ' are made of the same material (aluminum), airtightness can be ensured even when the temperature changes. If different materials are used, the airtightness will be weaker depending on the difference in thermal expansion coefficient when the temperature changes. A groove 50'a is formed on the inner peripheral wall surface of the lid 50 '.

[Procedure amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction contents]

FIG. 2 shows a second embodiment of the present invention. As shown in FIG. 2A, the left end 150a of the lid 150 is subjected to a diameter reduction process. On the other hand, the inner end portion 100'p of the main body 100 'made of aluminum is formed by caulking a tool having a ring-shaped blade as in the first embodiment. As shown in FIG. 2B, the inner flange portion 100 ′ p presses against a part 150 aa of the outer diameter of the reduced diameter portion 150 a of the lid 150 and the step portion 150 ab, and a sealing action is performed on these surfaces (indicated by dotted lines). ) Is obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hydraulic pump unit according to a first embodiment of the present invention.

FIGS. 2A and 2B show a main part of a second embodiment of the present invention, wherein A is before caulking and B is after caulking;

FIG. 3 is a piping diagram of a conventional anti-skid device.

FIG. 4 is an enlarged sectional view of a part of a hydraulic pump in the same device.

[Explanation of symbols]

 99 Cylinder main body 100 Main body 100 'Main body 100c Inner flange portion obtained by caulking 100'p Inner flange portion obtained by caulking

[Procedure amendment]

[Submission date] June 3, 1997

[Procedure amendment 10]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 99 'Cylinder main body 100 Main body 100' Main body 100c Inner flange portion obtained by swaging 100'p Inner flange portion obtained by swaging

[Procedure amendment 11]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

[Procedure amendment 12]

[Document name to be amended] Drawing

[Correction target item name] Figure 2

[Correction method] Change

[Correction contents]

FIG. 2

[Procedure amendment 13]

[Document name to be amended] Drawing

[Correction target item name] Fig. 4

[Correction method] Change

[Correction contents]

FIG. 4

Claims (5)

[Utility model registration claims] A body having an inner hole with a circular cross section, an insert inserted into the inner hole and supported by a part of the main body, and a lid covering an open end of the main body; A sealing means attached to the outer periphery of the lid body, wherein the sealing means fluidly isolates the outside and the inside of the inner hole of the body from each other on both sides thereof, A fluid pressure device wherein an opening end portion is plastically deformed, and the plastically deformed portion is pressed against an end portion of the lid to form the sealing means. 2. An end portion of the lid is subjected to a diameter reduction process, and the plastically deformed portion is pressed into contact with a step portion formed by the diameter reduction process and an outer diameter reduction portion in an inner flange shape. The fluid pressure device according to claim 1. 3. The insert body is a cylinder body having an inner hole with a circular cross section, a piston is slidably fitted in the inner hole of the cylinder body, and the outer periphery of the piston is The fluid pressure device according to claim 1, further comprising a seal ring that fluidly isolates the inner hole from both sides. 4. The fluid pressure device according to claim 1, wherein the main body and the lid are made of the same material. 5. The plunger of a hydraulic pump for an anti-skid device, wherein the piston is in contact with a cam member driven by an electric motor at one end, and the other end is biased toward the cam member by a spring. Item 5. A hydraulic device according to any one of Items 1 to 4.