JP6123308B2 - Hydraulic accumulator - Google Patents

Description

  The present invention relates to a hydraulic accumulator used in a vehicle brake device and the like.

  Liquid pressure consuming device that introduces liquid pressurized by a pump into a variable volume accumulator (accumulation chamber) and stores the pressure, and sends the pressure when the pressure of the hydraulic circuit communicating with the accumulator is insufficient A hydraulic accumulator to be supplied to a hydraulic booster or a hydraulically operated actuator is used for a vehicle brake device or the like.

  As a method for connecting the hydraulic accumulator to a pump or a hydraulic consuming device, for example, Patent Document 1 below arranges a pipe between an inlet hole, an outlet hole, an adapter having a fitting hole, and an accumulator. The structure which uses the clearance gap provided in a hole and pipe outer periphery as a channel | path is disclosed.

  In this structure, the pipe is press-fitted into the fitting hole of the adapter at the lower part of the pipe, and a cylindrical inlet portion provided at the lower end of the accumulator is screwed into an attachment hole formed in the adapter. Further, the upper end side of the pipe is inserted inside the cylindrical inlet portion, and the inlet hole is communicated with the pressure accumulating chamber of the accumulator through the hole of the pipe. Further, a gap provided at the outer periphery on the upper end side of the pipe is used as a throttle passage, and the pressure accumulation chamber is communicated with the outlet hole via the throttle passage.

Utility Model Registration No. 2589047

  As shown in Patent Document 1, a hydraulic accumulator having a structure in which a pipe is press-fitted into a connection partner member (adapter in the case of the same document), and a pressure accumulating chamber is connected to the pump and the hydraulic pressure consuming device using the pipe. There is a risk that the diameter of the pipe may be reduced by press fitting. When the diameter of the press-fitted portion of the pipe is reduced, the hole diameter of the pipe is partially reduced, thereby causing a problem of increase in flow resistance.

  In order to avoid this problem, using a thick pipe that does not easily change its inner diameter due to press fitting will lead to an increase in the size and weight of the accumulator.

  The equipment mounted on the vehicle is required to be further reduced in size and weight, and it is not preferable to use a thick-walled pipe from this aspect.

  Therefore, as disclosed in Patent Document 1, the present invention relates to a hydraulic accumulator having a structure in which a pipe is press-fitted into a connection partner member and a pressure accumulating chamber is connected to a pump and a hydraulic pressure consuming device using the pipe. The purpose is to make it possible to ignore the effects of pipe press-in and to make the pipe thinner.

  In order to solve the above-described problems, in the present invention, a pressure accumulating chamber, a main body having a passage hole also serving as an inlet / outlet communicating with the pressure accumulating chamber, a connection partner member for attaching the main body in a liquid-tight manner, and one end side of the main body A pipe in which the other end is press-fitted and fixed to the opening of the passage hole or a communication hole to a pump or a hydraulic pressure consuming device provided in the connection partner member. And a hydraulic accumulator in which a gap formed on the outer circumference of one end of the pipe serves as a hydraulic pressure introducing path to the pressure accumulating chamber and a hydraulic pressure sending path from the pressure accumulating chamber, the pipe is provided with an inner diameter enlarged portion, and the inner diameter enlarged The part was press-fitted into the communication hole or the passage hole.

Preferred forms of such a hydraulic accumulator are listed below.
1) On the outer periphery of the inner diameter enlarged portion of the pipe, an outer diameter enlarged portion having an outer diameter larger than the outer diameter of the inner diameter non-enlarged portion (part having a smaller inner diameter than the inner diameter enlarged portion) of the pipe is formed.
2) A step is provided at the boundary between the outer diameter enlarged portion of the pipe and the outer diameter non-expanded portion having a smaller outer diameter.
3) The pipe is press-fitted and fixed in the communication hole, and a drop-off prevention portion is provided in the main body to prevent the stepped portion of the pipe from falling off from the communication hole in the pipe withdrawal direction.
4) A flange projecting to the outer diameter side of the outer diameter enlarged portion is provided at the step portion of the pipe.
5) A tapered or curved inclined outer peripheral surface inclined with respect to the axial direction is provided between the outer diameter enlarged portion of the pipe and the outer diameter non-enlarged portion having a smaller outer diameter.
6) An opening of a hydraulic pressure passage communicating with a hydraulic pressure delivery path from the pressure accumulation chamber or a hydraulic pressure introduction path to the pressure accumulation chamber is formed at a position of the main body or the connection partner member facing the inclined outer peripheral surface of the pipe. To do.

  The hydraulic accumulator of the present invention is provided with an inner diameter enlarged portion in a pipe for forming a passage, and the inner diameter enlarged portion is provided in a communication hole to a pump or a hydraulic pressure consuming device provided in a connection partner member or in the main body. And press fit into the opening of the passage hole. Therefore, even if the inner diameter enlarged portion of the pipe is deformed so that the inner diameter becomes smaller, the influence thereof hardly propagates to the internal passage of the pipe, and the increase in flow resistance is suppressed.

  If the inner diameter expansion allowance compared with the inner diameter of the other part of the inner diameter enlarged portion is set to be larger than the press-fitting allowance of the pipe to the communication hole, the inner diameter of the inner diameter enlarged portion is reduced by press-fitting. However, the increase in flow path resistance is suppressed to zero.

  As described above, in the hydraulic accumulator of the present invention, the influence of the pipe press-fitting does not directly lead to an increase in the channel resistance. Therefore, it is possible to reduce the thickness of the passage forming pipe.

  The hydraulic accumulator according to the above 1) in which the outer diameter enlarged portion larger in diameter than the outer diameter of the non-inner diameter enlarged portion is formed on the outer periphery of the inner diameter enlarged portion of the pipe can reduce the thickness of the pipe. The lightening effect by can also be expected.

  Also, for pipes with the same outer diameter as those using thick pipes, the pipe diameter is larger than that using thick pipes, and the flow resistance can be reduced. In addition, for pipes that have the same pipe inner diameter as those using thick pipes, the non-expanded portion of the outer diameter of the pipe is thinner compared to those using thick pipes, making it easier to reduce the size. Become.

  In addition, in the case where a step portion is provided at the boundary between the outer diameter enlarged portion of the pipe and the outer diameter non-expanded portion of the pipe, the step portion can be used as a force point (pressing load application point) during press fitting work. The press-fitting work becomes easier.

  Further, the pipe is press-fitted and fixed in the communication hole, and the main body is provided with a drop-off prevention portion for preventing the pipe from dropping out from the communication hole of the stepped portion of the pipe. Omission does not occur.

  In addition, if the flange of the pipe step is provided with a flange projecting to the outer diameter side of the pipe outer diameter enlarged portion, the shaft of the part where the force point is press-fitted when the step is used as the force point during press-fitting work Even when the outer diameter enlarged portion of the pipe is thin, it is possible to eliminate the problem that the outer diameter enlarged portion is bent by press-fitting.

  In addition, when an inclined outer peripheral surface that is inclined with respect to the axial direction is provided between the outer diameter enlarged portion and the outer diameter non-expanded portion of the pipe, it is necessary to cause a diameter difference in the pipe due to drawing processing accompanied by plastic deformation. The stress generated at the boundary between the outer diameter enlarged portion and the outer diameter non-expanded portion is alleviated in comparison with a mode in which the outer diameter enlarged portion and the outer diameter non-expanded portion are connected in a state where there is no inclined outer peripheral surface.

  Further, the connection partner member, in which the opening of the hydraulic pressure passage leading to the hydraulic pressure delivery path from the pressure accumulation chamber or the hydraulic pressure introduction path to the pressure accumulation chamber is formed at a position facing the inclined outer peripheral surface of the pipe, The inclined outer peripheral surface acts as a liquid flow guide surface between the hydraulic pressure passage formed on the outer periphery and the hydraulic pressure passage formed on the connection partner member. Therefore, the liquid flow from the pressure accumulation chamber to the opening or the liquid flow from the opening to the pressure accumulation chamber is smoothed, and the flow of the hydraulic pressure becomes more stable.

Broken front view showing an example of the hydraulic accumulator of the present invention Sectional drawing which shows the principal part of the other example of a pipe Sectional drawing which shows the principal part of another example of a pipe The perspective view which shows an example of the external appearance of the pipe of FIG. Broken front view showing another example of the hydraulic accumulator of the present invention

  An embodiment of a hydraulic accumulator of the present invention will be described based on FIGS. 1 to 5 of the accompanying drawings.

  As shown in FIG. 1, the hydraulic accumulator according to the present invention is composed of a main body 1, a connection partner member 2 for attaching the main body 1 in a liquid-tight manner, and a pipe 3 for forming a passage.

  The main body 1 includes a shell 1a having a variable volume accumulating chamber (chamber) 1b, a gas-filled chamber 1c in which pressurized gas is confined, a flexible film 1d and a movable plate 1e partitioning these chambers, The stay 1f that restricts the contraction of the flexible membrane 1d and the passage hole 1g that is also used as the entrance / exit leading to the pressure accumulating chamber 1b are illustrated. 1h is an annular seal member attached to the movable plate 1e.

  However, it is not limited to this structure. The illustrated flexible film 1d of the accumulator is a metal bellows, but a rubber film may be used.

  The connection partner member 2 is a housing of a hydraulic unit incorporating a pump (not shown), a relay adapter as shown in Patent Document 1, and the like. A communication hole 2a is provided that allows the pressure accumulating chamber 1b to communicate with a consuming device (also not shown, this hydraulic consuming device is a hydraulic booster, a hydraulic actuator, etc.).

  The pipe 3 is provided with an inner diameter enlarged portion 3a on the lower end side, and the portion provided with the inner diameter enlarged portion 3a is press-fitted into the communication hole 2a in the hydraulic accumulator of the first form in FIG. It is fixed to the member 2. Then, the upper side of the pipe 3 is inserted into the passage hole 1g of the main body, the hole of the pipe is formed as a hydraulic pressure introduction path 4 from the pump connected to the pressure accumulating chamber 1b, and the gap generated on the upper outer periphery of the pipe Is formed as a hydraulic pressure delivery path 5 from the pressure accumulation chamber 1b.

  Reference numeral 6 denotes a hydraulic pressure passage provided in the connection partner member 2. The opening 6a of the hydraulic pressure passage 6 communicates with a hydraulic pressure delivery path 5 formed on the outer periphery of the pipe 3, and the hydraulic pressure from the pressure accumulating chamber 1b passes through the hydraulic pressure delivery path 5 and the hydraulic pressure path 6 in this order to consume the hydraulic pressure. Supplied to the device.

  In the description here, the passage formed by the hole of the pipe 3 is considered as the hydraulic pressure introduction passage, and the passage formed by the clearance around the outer periphery of the pipe 3 is considered as the hydraulic pressure delivery passage. The introduction path and the hole of the pipe 3 may be used as a hydraulic pressure delivery path. It is preferable that the hole of the pipe 3 used as the hydraulic pressure introduction path and the hydraulic pressure delivery path and the gap on the outer periphery of the pipe can obtain a throttling effect because it can provide a pulsation damping function of the pump. Absent.

  Note that the pipe 3 provided in the hydraulic accumulator of FIG. 1 is a so-called deformed pipe in which a portion excluding the inner diameter enlarged portion 3a is formed as an inner diameter non-enlarged portion 3b. In this pipe 3, the outer diameter of the inner diameter enlarged portion 3a is made larger than the outer diameter of the inner diameter non-enlarged portion 3b so as to be thinner than the pipe without the inner diameter enlarged portion. The outer circumferences of the diameter enlarged portion 3c and the inner diameter non-enlarged portion 3b are formed as an outer diameter non-enlarged portion 3d.

  Weight reduction can be achieved by using such a thin pipe. The inner diameter enlarged portion 3a and the inner diameter non-enlarged portion 3b of the pipe 3 are formed by increasing the inner diameter of a part of the material pipe to form the inner diameter enlarged portion 3a, or by reducing the inner diameter of a part of the material pipe to reduce the inner diameter. It can form by the method of forming the part 3b. The thickness of the pipe 3 is determined in consideration of the type of material. The material is preferably stainless steel having excellent corrosion resistance.

  The pipe 3 provided in the hydraulic accumulator of FIG. 1 is provided with a step portion 3e perpendicular to the axis that absorbs the difference in diameter at the boundary between the outer diameter enlarged portion 3c and the outer diameter non-expanded portion 3d. It can be used as a power point for press-fitting work, and press-fitting work is easy.

  Further, in the hydraulic accumulator of FIG. 1, the cylindrical mouth portion 1i provided in the lower portion of the shell 1a is inserted into the mounting hole 2b provided in the connection partner member 2, and the end surface of the cylindrical mouth portion 1i is formed into the step portion 3e. A dropout prevention portion 7 is configured to prevent the stepped portion 3e from dropping in the upward direction in the drawing (dropping of the pipe from the communication hole 2a in the pulling out direction) by being opposed to the inner diameter enlarged portion 3a of the pipe 3. On the other hand, even if an internal pressure in the direction in which the pipe is pulled out from the communication hole 2a is applied, or the pipe fixing force is reduced due to the press-fitting due to the thinning of the pipe, the press-fitting length of the pipe 3 into the communication hole 2a (the length in the pipe axial direction) ) Is larger than the axial distance between the drop prevention part 7 and the step part 3e of the pipe 3, so that the pipe does not fall off.

  In addition, as shown in FIG. 2, the flange 8 which protrudes in the outer diameter side rather than the outer diameter expansion part 3c can be provided in the step part 3e of the outer periphery of the pipe 3. As shown in FIG.

  The illustrated flange 8 is formed by expanding the diameter of the pipe 3 and crushing the expanded diameter portion in the axial direction, but may be a flange formed by cutting. When the pipe 3 is press-fitted into the communication hole 2a with the stepped portion 3e as a power point, the one having the flange 8 is easily disposed on the axial extension of the portion to be pressed-in. For this reason, even if the outer diameter enlarged portion 3c of the pipe 3 is thin, the outer diameter enlarged portion is bent by press-fitting (if the force point is shifted in the radial direction with respect to the press-fitted portion, a bending moment is generated. ) Can be prevented.

  FIG. 3 shows an inclined outer peripheral surface 9 that is inclined with respect to the axial direction between an outer diameter enlarged portion 3c and an outer diameter non-expanded portion 3d of the pipe 3. The inclined outer peripheral surface 9 inclined with respect to the axial direction may be a tapered surface with a constant inclination angle, or may be a phase where the inclination angle gradually changes.

  Further, as shown in FIG. 4, the inclined outer peripheral surface 9 is formed by forming a step portion 3e perpendicular to the axis on the outer periphery of the pipe 3 and recessing a part of the step portion 3e, an outer diameter enlarged portion 3c, The outer peripheral surface of the predetermined axial length range between the outer diameter non-enlarged portion 3d is inclined over the entire circumference, a step is formed on a part of the outer periphery of the pipe 3, and the remaining portion is the inclined outer peripheral surface Any of the followings may be used.

  The pipe formed with the inclined outer peripheral surface over a wide range in the circumferential direction requires a special press-fitting jig having a pressure surface that is in close contact with the inclined outer peripheral surface. Compared with the case where the step part 3e perpendicular to the axis is formed at the boundary between the outer diameter enlarged part 3c and the outer diameter non-enlarged part 3d, the outer diameter enlarged part 3c and the outer diameter non-enlarged part 3d are formed. The stress generated at the boundary can be relaxed.

  As shown in FIG. 3, by forming the opening 6a of the hydraulic passage 6 provided in the connection partner member 2 at a position facing the inclined outer peripheral surface 9, the hydraulic passage formed on the outer periphery of the pipe and the connection counterpart member The slanted outer peripheral surface 9 can act as a liquid flow guide surface between the formed hydraulic pressure passages, and the liquid flow from the pressure accumulating chamber 1b to the opening 6a is the reverse of the above. The liquid flow in the direction is smoothed and the flow of hydraulic pressure becomes more stable.

  FIG. 5 shows a second embodiment of the hydraulic accumulator of the present invention. As in the second embodiment, the pipe 3 is held by a method in which the inner diameter enlarged portion 3a provided in the pipe 3 is press-fitted and fixed to the opening portion of the passage hole 1g also serving as the entrance / exit provided in the main body 1. it can.

  In this second embodiment, a part of the hydraulic passage 6 (on the opening 6a side) is formed inside the cylindrical mouth portion 1i of the main body 1, but the desired function of the hydraulic accumulator can be sufficiently secured even in this case. .

  The hydraulic accumulator of the second embodiment is also preferably provided with a step portion in the middle of the passage hole 1g serving as the entrance / exit of the main body 1 and functioning as the drop-off prevention portion 7.

  In the hydraulic accumulator of the second form, the main body 1 can be attached to the connection partner member 2 in a state where the outer diameter non-enlarged portion 3d of the pipe 3 is covered with the main body 1 and protected.

DESCRIPTION OF SYMBOLS 1 Main body 1a Shell 1b Pressure accumulating chamber 1c Gas enclosure chamber 1d Flexible film 1e Movable plate 1f Stay 1g Passage hole 1h Annular seal member 1i Cylindrical port 2 Connection partner member 2a Communication hole 2b Mounting hole 3 Pipe 3a Inner diameter expansion part 3b Inner diameter Non-enlarged portion 3c Outside diameter enlarged portion 3d Outside diameter non-enlarged portion 3e Step portion 4 Hydraulic pressure introduction path 5 Hydraulic pressure delivery path 6 Hydraulic pressure path 6a Opening 7 Fallout prevention portion 8 Flange 9 Inclined outer peripheral surface

Claims (3)

A main body (1) having a pressure accumulating chamber (1b), a passage hole (1g) also serving as an entrance / exit leading to the pressure accumulating chamber (1b), a coupling partner member (2) for attaching the main body (1) in a liquid-tight manner, One end side is inserted into the passage hole (1g) of the main body, and is connected to the communication hole (2a) to the pump or hydraulic pressure consuming device provided in the connection partner member (2) or the opening of the passage hole (1g). A pipe (3) whose other end is press-fitted and fixed, and a hydraulic pressure introducing path (4) to the pressure accumulating chamber (1b) through the hole of the pipe (3) and the gap formed on the outer periphery of the one end of the pipe. And a hydraulic pressure delivery path from the pressure accumulating chamber (1b) (
5) In the hydraulic accumulator
The pipe (3) has an inner diameter enlarged portion (3a), and the inner diameter enlarged portion (3a) is press-fitted into the communication hole (2a) or the passage hole (1g) ,
On the outer periphery of the inner diameter enlarged portion (3a) of the pipe (3), the inner diameter non-enlarged portion (
An outer diameter enlarged portion (3c) having an outer diameter larger than the outer diameter of 3b) is formed ,
The outer diameter expansion part (3c) of the pipe (3) and the outer diameter non-expansion part (3d) having an outer diameter smaller than that.
) To form a step (3e) at the boundary with
A hydraulic accumulator characterized in that the step (3e) of the pipe (3) is provided with a flange (8) projecting outward from the outer diameter enlarged portion (3c). The pipe (3) is press-fitted and fixed in the communication hole (2a), and the pipe (3
Claim 1, the stepped portion of) (the falling-off prevention portion for preventing detachment of the pipe exit direction from the communicating hole (2a) of 3e) (7) is characterized in that provided in the main body (1) The hydraulic accumulator described in 1. A main body (1) having a pressure accumulating chamber (1b), a passage hole (1g) also serving as an entrance / exit leading to the pressure accumulating chamber (1b), a coupling partner member (2) for attaching the main body (1) in a liquid-tight manner, One end side is inserted into the passage hole (1g) of the main body, and is connected to the communication hole (2a) to the pump or hydraulic pressure consuming device provided in the connection partner member (2) or the opening of the passage hole (1g). A pipe (3) whose other end is press-fitted and fixed, and a hydraulic pressure introducing path (4) to the pressure accumulating chamber (1b) through the hole of the pipe (3) and the gap formed on the outer periphery of the one end of the pipe. And a hydraulic pressure delivery path from the pressure accumulating chamber (1b) (
5) In the hydraulic accumulator
The pipe (3) has an inner diameter enlarged portion (3a), and the inner diameter enlarged portion (3a) is press-fitted into the communication hole (2a) or the passage hole (1g) ,
On the outer periphery of the inner diameter enlarged portion (3a) of the pipe (3), the inner diameter non-enlarged portion (
An outer diameter enlarged portion (3c) having an outer diameter larger than the outer diameter of 3b) is formed,
The outer diameter expansion part (3c) of the pipe (3) and the outer diameter non-expansion part (3d) having an outer diameter smaller than that.
)) Is provided with a tapered or curved inclined outer peripheral surface (9) inclined with respect to the axial direction ,
The inclined outer peripheral surface (9) is formed by forming a step (3e) on the outer periphery of the pipe (3) and denting a part of the step.
The hydraulic accumulator is characterized in that an opening (6a) of a hydraulic pressure passage (6) communicating with the hydraulic pressure introduction passage (4) is formed at a position facing the inclined outer peripheral surface (9) .

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