JPH0547440U - pump - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent corrosion of the pump body due to electrochemical corrosion at the parts where the pump body and the joints and washers made of different materials come into contact with each other. [Structure] A seal member 13 is provided on the outer periphery of a pump body 1 and a washer 2 made of a material different from that of the pump body 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a pump capable of supplying hydraulic oil to a power steering device or the like of an automobile.

[0002]

[Prior Art]

 In this type of pump, a joint for guiding the hydraulic oil of the pump is attached to the discharge part of the pump body, and the hydraulic oil is guided to the actuator. At this time, the joint is attached to the pump body directly or via a metal washer.

[0003]

[Problems to be solved by the device]

 Generally, the conventional pump body is made of cast iron, and the joints and washers are made of iron-based material. Alternatively, the washer may be formed of a copper alloy material. By the way, as shown in, for example, Japanese Patent Laid-Open No. 64-8380, a pump body made of an aluminum alloy has been known in recent years for weight reduction. In this case, the material of the joint or washer that contacts the pump body is different from that of the pump body. Therefore, if water or salt water adheres to the parts that are in contact with different materials, electrochemical corrosion phenomenon may occur due to the difference in ionization tendency of each material, and the pump body made of aluminum alloy may be corroded. is there.

[0004]

[Means for Solving the Problems]

 Therefore, in the pump according to the first aspect, the seal member is provided on the outer peripheral portion of the metal washer whose material is different from that of the pump body. Further, in the pump of the second aspect, a seal member is provided on the outer circumference of the connecting portion between the pump body and the joint made of a material different from that of the pump body. Further, in the pump according to the third aspect, the electrical insulating member is provided between the pump main body and the metal washer whose material is different from that of the pump main body. Further, in the pump according to the fourth aspect, an electrically insulating member is provided between the pump body and the joint made of a different material. Further, in the pump of the fifth aspect, a metal washer made of a material different from that of the pump main body is housed and disposed in a recess formed in one or both of the members with which the washer contacts.

[0005]

[Action]

 The washer and joint made of metal, which is made of a different material from the pump body, is no longer exposed directly to the external environment.

[0006]

【Example】

 Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a plan view showing an embodiment of the pump according to the first aspect of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG.

In the figure, 1 is a pump body made of an aluminum alloy, 2 is a washer made of a material different from that of the pump body 1, for example, a washer made of a copper alloy, and 3 is a joint for introducing hydraulic oil of the pump to an actuator (not shown). As shown in FIG. 2, the joint 3 is attached to the opening of the spool accommodating hole 6 in which the spool 5 of the flow rate control valve 4 is accommodated by the connector 7 via the washer 2.

The flow control valve 4 includes a control orifice 11 provided between an introduction chamber 9 through which high pressure oil is introduced from an introduction hole 8 communicating with the high pressure chamber of the pump body 1 and a discharge passage 10 communicating with the joint. By controlling the opening and closing of the needle 12 attached to the spool 5 which responds to the differential pressure across the control orifice 11, the flow rate of the hydraulic oil introduced to the actuator (not shown) is controlled.

A seal member 13 is provided on the outer periphery of the washer 2. The seal member 13 is made of a rubber member or a synthetic resin material, and has a thickness larger than that of the washer 2 and has a main body. It is in close contact with 1 and the joint. As shown in FIG. 3, the seal member 13 can be integrated with the washer 2 by using an adhesive or by vulcanization.

Reference numeral 14 is an annular passage that connects the discharge passage 10 and a passage for guiding the working oil to an actuator (not shown) provided in the joint 3.

According to such a configuration, the connecting portion between the pump body 1 and the washer 2 made of a different material from the pump body 1 is covered with the seal member 13 and may be directly exposed to the external environment. Disappear. Therefore, it is possible to prevent water or salt water from adhering to this connecting portion, and advantageously prevent corrosion of the aluminum alloy pump body due to so-called electrolytic corrosion.

FIG. 4 is a view showing another embodiment. What is different from the above embodiment is that the seal member 13 is housed and arranged in an annular groove 15 provided in the pump body 1. In this case, the seal member 13 is in contact with the side surface of the annular groove 15 and the washer 2 without any gap.

In the case of this embodiment as well, the same operation and effect as in the above embodiment can be obtained, and the seal member 13 is in close contact with the side surface of the annular groove 15 and the washer 2 without a gap so that water, salt water, etc. It is more effectively prevented from adhering to the connection part with.

FIG. 5 shows an embodiment of the pump according to claim 2 of the present invention. In the description, the same components as those in the above embodiment are designated by the same reference numerals, and the duplicate description will be omitted.

That is, reference numeral 16 is a joint which is made of a material different from that of the pump body 1 and which guides the hydraulic fluid of the pump to an actuator (not shown). The joint 16 is screwed onto the open end of the spool housing hole 6. Reference numeral 17 is a seal ring provided between the inner periphery of the spool housing hole 6 and the joint 16. Reference numeral 18 denotes a seal member provided on the outer periphery of the connecting portion between the pump body 1 and the joint 16. The seal member 18 is made of a rubber material or a synthetic resin material and is housed in a groove 19 formed in the joint 16 without any gap. It The seal member 18 may be housed in a groove 20 provided in the pump body 1 as shown in FIG. 6, or a groove may be formed in both the pump body 1 and the joint 16, and It may be housed in.

According to this structure, the connecting portion between the pump body 1 and the joint 16 made of a material different from that of the pump body 1 is covered with the seal member 18 and is not directly exposed to the external environment. Therefore, it is possible to prevent water or salt water from adhering to this connection portion, and to prevent corrosion of the aluminum alloy pump body due to so-called electrolytic corrosion.

When the seal member in each of the above embodiments is made of a metal having a base potential with respect to the pump body 1, washer 2, joint 16 and the like, for example, a zinc alloy, contact with the seal member is made. Although the electrochemical corrosion phenomenon occurs in the part, the zinc alloy sealing member is first corroded, and the corrosion of the pump body 1 can be prevented by that much. Of course, the sealing member prevents water, salt water, etc. from adhering to the connecting portion, as in the above-described embodiment.

FIG. 7 is a view similar to FIG. 2, showing an embodiment of the pump according to claim 3 of the present invention. In the description, the same components as those in the above-mentioned embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

That is, an electrically insulating member 21 is provided between the pump body 1 and the metal washer 2 whose material is different from that of the pump body 1. The electrically insulating member 21 is formed of a rubber material or a synthetic resin material in a thin plate shape, and is preferably used by being bonded to the opening end 8 of the spool accommodating hole 6 or the washer 2.

According to this structure, electrical continuity between the pump body 1 and the washer 2 is prevented. Therefore, even if water, salt water, or the like adheres to the connection between the pump body 1 and the washer 2, corrosion of the aluminum alloy pump body due to so-called electrolytic corrosion is advantageously prevented.

FIG. 8 is a view similar to FIG. 2, showing an embodiment of the pump according to claim 4 of the present invention. In the description, the same components as those in the above-mentioned embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

That is, an electrically insulating member 22 is provided between the pump body 1 and the joint 16 made of a material different from that of the pump body 1. This electrically insulating member 22 is also made of a rubber material or a synthetic resin material as in the above-mentioned embodiment, and is preferably used by being bonded to the open end of the spool accommodating hole 6 or the joint 16.

According to this structure, electrical continuity between the pump body 1 and the joint 16 is prevented. Therefore, even if water, salt water, or the like adheres to the connection between the pump body 1 and the joint 16, corrosion of the aluminum alloy pump body due to so-called electrolytic corrosion is advantageously prevented.

FIG. 9 is a view similar to FIG. 2, showing an embodiment of the pump according to claim 5 of the present invention. In the description, the same components as those in the above-mentioned embodiment are designated by the same reference numerals, and the duplicated description will be omitted.

That is, the metal washer 2 made of a material different from that of the pump body 1 is housed in the recess 23 formed in the pump body 1 with which the washer 2 contacts. The recess 23 may be formed in the joint 3 as shown in FIG. 10, or may be provided in both the pump body 1 and the joint 3 by about ½ of the washer thickness.

With this configuration, the metal washer 2 made of a material different from that of the pump body 1 is housed in the recess 23, and the connecting portion is not directly exposed to the external environment. Therefore, it is possible to prevent water or salt water from adhering to the connecting portion, and advantageously prevent corrosion of the aluminum alloy pump body due to so-called electrolytic corrosion.

[0028]

[Effect of the device]

 As described in detail above, according to the present invention, the contact portion with the washer or joint having a gold attribute different from the material of the pump body is prevented from being directly exposed to the external environment. Further, the contact portion is electrically insulated. Therefore, even if water, salt water, or the like adheres to the connection between the pump body and the washer or joint, corrosion of the aluminum alloy pump body due to so-called electrolytic corrosion is advantageously prevented.

[Brief description of drawings]

FIG. 1 is a front view of a pump showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a cross-sectional view showing an embodiment in which a washer and a seal member are integrated by adhesion.

FIG. 4 is a view similar to FIG. 2, showing a second embodiment of the present invention.

FIG. 5 is a view similar to FIG. 2, showing a third embodiment of the present invention.

FIG. 6 is a view similar to FIG. 2, showing a fourth embodiment of the present invention.

FIG. 7 is a view similar to FIG. 2, showing a fifth embodiment of the present invention.

FIG. 8 is a view similar to FIG. 2, showing a sixth embodiment of the present invention.

FIG. 9 is a view similar to FIG. 2, showing a seventh embodiment of the present invention.

FIG. 10 is a view similar to FIG. 2, showing an eighth embodiment of the present invention.

[Explanation of symbols]

 1 Pump Main Body 2 Washer 3,16 Joint 13,18 Sealing Member 21,22 Electrical Insulation Member 23 Cavity

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masashi Oyaku 1370, Atsugi Unisia, Atsugi City, Kanagawa Prefecture (72) Inventor, Miyoko Hamao 1370, Atsugi City, Kanagawa Prefecture, Atsugi Unisia Corporation

Claims (5)

[Scope of utility model registration request] 1. A pump in which a joint for guiding hydraulic oil of the pump is connected to the pump body through a metal washer made of a material different from that of the pump body, wherein a seal member is provided on an outer peripheral portion of the washer. A pump characterized by. 2. A pump main body, which is made of a material different from that of the pump main body and is connected to a joint for guiding hydraulic oil of the pump, wherein a seal member is provided on an outer periphery of a connecting portion between the pump main body and the joint. And a pump. 3. A pump, wherein a joint is connected to the pump main body through a metal washer made of a material different from that of the pump, and a joint for introducing hydraulic oil of the pump is connected to the pump main body. An electrically insulating member is provided between the pump main body and the washer. A pump provided with. 4. A pump main body, which is made of a material different from that of the pump main body and is connected to a joint for guiding hydraulic oil of the pump, wherein an electrically insulating member is provided between the pump main body and the joint. And a pump. 5. A pump in which a joint for guiding hydraulic oil of the pump is connected to the pump main body through a metal washer made of a material different from that of the pump main body, wherein the washer is a member of each member with which the washer comes into contact. A pump characterized by being accommodated and arranged in a recess formed in either one or both.