JP4730156B2 - Fluid unit - Google Patents

Description

  The present invention relates to a fluid unit such as a vehicle hydraulic unit, and more particularly to a fluid unit in which a filter member is disposed in a flow path that opens to a damper chamber.

  As a fluid unit, there is known a vehicle hydraulic unit in which a damper chamber is formed in a housing and a filter member is disposed in a flow path opening to the damper chamber. For example, in Patent Document 1 below, regarding a hydraulic system unit for a brake system, a filter member is disposed in a passage that opens in an “arrangement hole that acts as a buffer chamber”, and dust particles enter the hole of the “throttle”. It is stated to prevent this. Although the phrase “arrangement hole” itself is difficult to understand, with reference to FIG. 3 of Patent Document 1, if the “arrangement hole” corresponds to the damper chamber and the “throttle” corresponds to the orifice, the damper chamber Thus, the orifice and the filter member are disposed in the flow path that opens to the bottom.

  Patent Document 2 below proposes an ABS actuator that increases the damper capacity and reduces noise during operation. A cup member is inserted into a recess that forms a damper chamber, and an orifice is inserted into the cup member. Is formed. Note that Patent Document 2 describes that a duct extending in an oblique direction from the inner wall of the recess is formed.

Japanese National Patent Publication No. 08-502007 JP 2001-260846 A

  Since the actuator described in Patent Document 2 is not provided with a filter member as described in Patent Document 1, it cannot cope with the dust particles pointed out in Patent Document 1 at least near the orifice. On the other hand, as described in Patent Document 1, it is not solved by simply adding a filter member. In the hydraulic unit described in Patent Document 1, for example, when vacuum filling of brake fluid is performed, The filter member may fall into the damper chamber due to the flow of the filled brake fluid. Therefore, it is necessary to take some measures to prevent the slipping, but neither of Patent Documents 1 and 2 mentions a problem at the time of vacuum filling of the brake fluid, and of course, no appropriate measures are found. For example, when the filter member is press-fitted into the flow path and fixed, it is necessary to press-fit to the extent that the filter member can be prevented from falling off, and the filter member itself is required to have high strength. .

  Accordingly, an object of the present invention is to provide a fluid unit in which a filter member is disposed in a flow path that opens in a damper chamber so that the filter member can be prevented from dropping off easily and inexpensively.

  To achieve the above object, according to the present invention, as described in claim 1, a damper chamber having a bottomed cylindrical space is formed in a housing, and a flow path opening to the damper chamber is formed. A fluid unit comprising: a filter member accommodated in the flow path; and a lid inserted into the opening of the damper chamber in a state where the filter member is accommodated in the flow path. The longest distance between the opening end surface of the filter member and the lid body is such that when the one axial end portion of the filter member abuts on the lid body, the other axial end portion of the filter member is located in the flow path. The lid is fixed to the opening of the damper chamber.

  In particular, as described in claim 2, the damper has a positional relationship in which the central axis of the flow path interferes with the central axis of the bottomed cylindrical space including the center of the opening end surface of the damper chamber. The chamber and the flow path may be formed in the housing. In this case, as described in claim 3, the positional relationship and the positional relationship of torsion where the central axis of the flow path intersects the central axis of the bottomed cylindrical space including the center of the opening end surface of the damper chamber It is good to be either.

  According to a fourth aspect of the present invention, the lid body may have an outer surface facing the opening end surface of the flow path in a state of being inserted into the opening of the damper chamber. Further, as described in claim 5, the flow path may be formed so as to open near the opening end face of the damper chamber.

  Furthermore, as described in claim 6, it is preferable that an orifice disposed in the flow path is provided, and the filter member is accommodated in the flow path between the orifice and the damper chamber. . The orifice is formed in a bottom portion of a cup member accommodated in the flow path, and the cup member is disposed on a side opposite to the side facing the damper chamber with respect to the filter member. It is good to arrange. And as described in Claim 8, it is good to accommodate in the said flow path so that the said filter member may contact | abut with respect to the said cup member press-fit in the said flow path.

  Since this invention is comprised as mentioned above, there exist the following effects. That is, in the fluid unit according to the first aspect, the filter member is accommodated in the flow path that opens in the damper chamber, and the longest distance between the opening end surface of the flow path into the damper chamber and the lid body is that of the filter member. Since the other end in the axial direction is set in the flow path when one end in the axial direction comes into contact with the lid, the lid is fixed to the opening of the damper chamber. Even if foreign matter is present, it can be blocked by the filter member. Moreover, if one end of the filter member in the axial direction is in contact with the lid, the other end of the filter member in the axial direction is located in the flow path, so that the filter member can be prevented from falling off, and a simple configuration. Thus, it is possible to provide an inexpensive device that can reliably perform so-called retaining.

  According to the second and third aspects of the present invention, even if one end of the filter member in the axial direction comes into contact with the lid, the other end of the filter member in the axial direction is located in the flow path. Therefore, it is possible not only to prevent the filter member from falling off, but also to secure a sufficient opening area.

  According to the fourth aspect of the present invention, since the one end portion in the axial direction of the filter member is surely brought into contact with the outer surface of the lid, it is possible to prevent the filter member from falling off. Furthermore, if it comprises as described in Claim 5, the outer surface part of a cover body can be formed short, the insertion operation of the filter member in a flow path, and the insertion of a cover body to the opening of a damper chamber Work becomes easy.

  According to the sixth aspect of the present invention, even if foreign matter is present in the damper chamber, it can be blocked by the filter member, the function of the orifice can be reliably maintained, and the reliability can be improved. Can be secured. Furthermore, if it comprises as described in Claim 7, an orifice can be arrange | positioned easily and cheaply. And if comprised as described in Claim 8, a filter member can be appropriately arrange | positioned with respect to an orifice.

  Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 show a part of a fluid unit according to an embodiment of the present invention, which is used in a hydraulic unit in the vehicle brake control device shown in FIG. In the housing 1, a damper chamber 1 d having a bottomed cylindrical space is formed, and a downstream flow path P 1 and an upstream flow path P 2 that open to the damper chamber 1 d are formed. The orifice member 2 is disposed in the downstream flow path P1, and the filter member 3 is accommodated in the flow path P1 between the orifice member 2 and the damper chamber 1d. And the cover body 4 is inserted in the opening 1a of the damper chamber 1d in the state which the filter member 3 was accommodated in the flow path P1.

  In the present embodiment, the lid 4 is a bottomed cylinder made of metal, and has a small gap with respect to the opening end surface of the flow path P1 in a state of being inserted into the opening 1a of the damper chamber 1d as shown in FIG. The outer surface 4a is opposed to each other, and a communication hole 4b for venting air is formed in a part thereof. In this embodiment, the damper chamber 1d and the flow path P1 are arranged such that the central axis Cp of the flow path P1 intersects the central axis Cd of the bottomed cylindrical space including the center of the opening end face of the damper chamber 1d. It is formed in the housing 1, and in FIG. 1, the central axis Cd and the central axis Cp are acute angles. Therefore, when the lid 4 is fixed to the opening 1a of the damper chamber 1d, the longest distance d between the opening end surface 1e of the flow path P1 into the damper chamber 1d and the lid 4 is a filter having an axial dimension L. Even when one axial end portion of the member 3 abuts against the lid body 4, the other axial end portion of the filter member 3 is located in the flow path P1.

  An annular protrusion 4c for locking is formed on the bottom part (upper part in FIG. 1) of the lid body 4. After the annular protrusion 4c is fitted into the stepped opening 1b of the housing 1, a punch (not shown) is formed. Z)). That is, the stepped opening 1b of the housing 1 is plastically deformed to form the locking portion 1c, thereby holding the annular protrusion 4c.

  As shown in FIG. 1, the flow path P1 is formed in a stepped shape, and after the orifice member 2 is press-fitted into the small diameter portion, the filter member 3 is accommodated in the large diameter portion. The orifice member 2 of the present embodiment has an orifice 2b formed at the bottom of a metal cup member 2a. The orifice member 2 is disposed on the opposite side of the filter member 3 from the side facing the damper chamber 1d, and is located in the flow path P1. Press fit. And the filter member 3 is accommodated in the flow path P1 so that it may closely_contact | adhere to the opening end surface of this orifice member 2. FIG. The flow path P1 communicates with the flow path P1x orthogonal to this, and a downstream flow path is formed with respect to the damper chamber 1d. And since the flow path P1 is formed so that it may open in the opening end surface vicinity of the cover body 4, the outer surface 4a part of the cover body 4 which opposes this can be formed short. Also, the operation of inserting the orifice member 2 and the filter member 3 into the flow path P1 and the operation of inserting the lid 4 into the opening 1a of the damper chamber 1d are facilitated. In addition, it is good also as forming an orifice directly in the flow path P1, without providing the orifice member 2, and it is good also as providing an orifice in the downstream of the flow path P1 separately. Furthermore, an orifice may be provided in the flow path P1x, or an orifice may be provided on the downstream side of the flow path P1x.

  The filter member 3 is formed as shown in FIG. That is, a plurality of leg portions (also referred to as ribs, which are represented by 3b representatively) extend in the axial direction from the cylindrical portion 3a fitted in the flow path P1, and the leg portions 3b. A support portion 3c is formed so as to connect the two, and a holding container is configured. And the filter 3f comprised, for example by a mesh filter is inserted through the stepped hole 3d of the cylindrical part 3a, and is hold | maintained by the leg part 3b in the state contact | abutted to the support part 3c.

  Thus, the fluid flowing into the stepped hole 3d is filtered by the filter 3f, and the orifice member 2 (via the gap between the plurality of legs 3b and these and the inner wall surface of the flow path P1 (FIG. 1). It is supplied into the cup member 2a of FIG. As a result, since pressure is normally applied to the filter member 3 in the direction of the orifice member 2, the filter member 3 is not pressed in the direction of the damper chamber 1d. However, as will be described later, even if the filter member 3 is pressed in the damper chamber 1d direction, the filter member 3 and the lid 4 are in the above-described dimensional relationship, so the filter member 3 is placed on the outer surface 4a of the lid 4. The filter member 3 does not fall out from the flow path P1 into the damper chamber 1d. Therefore, it is not necessary to use a metal for the filter member 3, and it can be formed inexpensively with a synthetic resin as described above.

  The fluid unit having the above-described configuration is applied to, for example, the vehicle brake control device shown in FIG. 3, the downstream flow path P1 is connected to a control system (not shown), and the upstream flow path P2 is a pump. Connected to HP. Since the vehicular brake control device shown in FIG. 3 is well known, the reference numerals in FIG. 1 are given to members constituting the fluid unit, and description of other components is omitted.

  Thus, the brake fluid discharged from the pump HP is supplied to the damper chamber 1d via the upstream flow path P2, and via the downstream flow path P1, the filter member 3, the orifice member 2, and the flow path P1x. It is supplied to a control system (not shown). At this time, even if foreign matter is present in the damper chamber 1d, the filter member 3 can prevent entry into the orifice member 2, so that there is no possibility that the orifice 2b is clogged with foreign matter. In addition, as shown in FIG. 1, the central axis Cp of the flow path P1 intersects with the central axis Cd, and the filter member 3 is held in the flow path P1. Even when one axial end of 3 abuts against the lid 4, a sufficient opening area is ensured between the outer surface 4 a of the lid 4 compared to the case where the central axis Cd and the central axis Cp are vertical. The desired effect by the orifice member 2 can be obtained.

  On the other hand, when the brake fluid is vacuum-filled from the downstream flow path P1x, the filter member 3 may move toward the damper chamber 1d due to the flow of the brake fluid toward the damper chamber 1d. 3 and the lid 4 are in the above-described dimensional relationship, so that even if the filter member 3 is pressed in the damper chamber 1d direction, the movement of the filter member 3 is allowed on the outer surface 4a of the lid 4. Therefore, the filter member 3 does not fall out of the flow path P1 into the damper chamber 1d, and the filter member 3 can be reliably prevented with the simple structure as described above. The member 3 can be made of an inexpensive synthetic resin.

  In FIG. 4, for example, a disc-shaped lid 4x is used instead of the lid 4 described above, and the filter member 3 between the opening end surface 1e into the damper chamber 1d of the flow path P1 and the lid 4x is used. An embodiment in which the longest axial distance d is longer than that in FIG. 1 is shown. Also in this case, the longest distance d between the opening end surface 1e into the damper chamber 1d of the flow path P1 and the lid 4x is such that one end in the axial direction of the filter member 3 is as indicated by a two-dot chain line in FIG. Since the other axial end of the filter member 3 is set in the flow path P1 when it comes into contact with the lid 4x, the lid 4x fixed to the opening 1a causes the filter member 3 to Drop off can be prevented. In FIG. 4, the filter member 3 is arranged so that the large-diameter cylindrical portion 3 a side is positioned below, and is arranged in the upside down direction with respect to the filter member 3 in FIG. 1. Accordingly, even when the filter member 3 moves as indicated by a two-dot chain line in FIG. 4, the cylindrical portion 3a is located in the flow path P1, so that the filter member 3 is reliably held in the flow path P1.

  In the above embodiment, the damper chamber 1d and the flow are arranged such that the central axis Cp of the flow path P1 intersects the central axis Cd of the bottomed cylindrical space including the center of the opening end surface of the damper chamber 1d at an acute angle. Although the path P1 is formed in the housing 1, it may not be an acute angle, and may be formed so as to have a twisted positional relationship without intersecting the two axes. In short, it is only necessary that the damper chamber 1d and the flow path P1 be formed in the housing 1 so that the center axis Cp interferes with the center axis Cd. In the above embodiment, the orifice member 2 is provided. However, as described above, the orifice may be provided at a position different from that shown in FIG. 1, and the orifice is not essential in the present invention. And in said embodiment, although the flow path P1 is formed so that it may open near the opening end surface of the cover body 4, as this invention, it does not necessarily restrict to the structure where a flow path opens near an opening end surface. Absent.

  Further, the central axis Cd and the central axis Cp in FIG. 1 may be parallel or coincide with each other (not shown). In this case, too, the opening end face of the flow path into the damper chamber, the lid, Is set so that the other axial end of the filter member is located in the flow path when one axial end of the filter member abuts the lid. It is necessary to fix to the opening. Note that the fluid unit is not limited to the above-described hydraulic unit, and there are various modes such as a pneumatic unit.

It is sectional drawing which shows a part of fluid unit which concerns on one Embodiment of this invention. It is a perspective view of the filter member provided to the fluid unit of one embodiment of the present invention. It is a lineblock diagram showing an example of a brake control device for vehicles to which a fluid unit concerning one embodiment of the present invention is applied. It is sectional drawing which shows a part of fluid unit which concerns on other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Housing 1d Damper chamber 2 Orifice member 2b Orifice 3 Filter member 3f Filter 4, 4x Lid P1, P1x, P2 Flow path

Claims (8)

  A damper chamber having a bottomed cylindrical space is formed in the housing, and a channel opening to the damper chamber is formed. A filter member accommodated in the channel, and the filter member accommodated in the channel In a fluid unit including a lid inserted into the opening of the damper chamber in a state of being in a state of being in contact, the longest distance between the opening end surface of the flow path into the damper chamber and the lid is determined by the axis of the filter member. It is set so that the other axial end of the filter member is positioned in the flow path when one end in the direction comes into contact with the lid, and the lid is fixed to the opening of the damper chamber. A fluid unit characterized by   The damper chamber and the flow path are formed in the housing such that the central axis of the flow path interferes with the central axis of the bottomed cylindrical space including the center of the opening end surface of the damper chamber. The fluid unit according to claim 1, wherein the fluid unit is formed.   3. The positional relationship between the central axis of the bottomed cylindrical space including the center of the opening end surface of the damper chamber and the central axis of the flow path and the positional relationship of torsion. The fluid unit described.   4. The fluid unit according to claim 2, wherein the lid body has an outer surface facing the opening end surface of the flow path in a state of being inserted into the opening of the damper chamber. 5.   5. The fluid unit according to claim 4, wherein the flow path is formed so as to open in the vicinity of an opening end surface of the damper chamber.   The fluid unit according to claim 1, further comprising an orifice disposed in the flow path, wherein the filter member is accommodated in a flow path between the orifice and the damper chamber.   The orifice is formed at the bottom of a cup member accommodated in the flow path, and the cup member is disposed on the opposite side of the filter member from the side facing the damper chamber. The fluid unit according to claim 6. 8. The fluid unit according to claim 7, wherein the fluid member is accommodated in the flow path so that the filter member comes into contact with the cup member press-fitted into the flow path.

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