JP2014185577A - Tank-integrated pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tank-integrated pump device which can secure the fastening stability of a suction passage connecting part.SOLUTION: In the present tank-integrated pump device having a pump device and a reservoir tank, when an insertion direction at the insertion of a suction passage connecting part of the reservoir tank into a suction passage of the pump device is set as an axial direction, a line of the substantial center of the suction passage out of a virtual line extending to the axial direction is set as a reference axial line, and the direction of the axial line radially extending from the reference axial line is set as a radial direction, a pair of connecting parts are arranged so as to sandwich the suction passage connecting part at the outside the radiation direction rather than the suction passage connecting part and in the radial direction.

Description

  The present invention relates to a tank-integrated pump device in which a reservoir tank that stores hydraulic fluid and a pump device are integrated.

  Conventionally, the technique of patent document 1 is known as a tank integrated pump apparatus. In this publication, when the reservoir tank and the pump device are integrated, they are sandwiched by clips inserted from the outside to the inside of the housing, thereby integrating them.

JP 2008-121689 A

However, the fastening point for the clip is located away from the suction passage connection portion where the working fluid flows between the reservoir tank and the pump, making it difficult to secure the fastening force and the fastening stability of the suction passage connection portion. There was a problem that became low.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a tank-integrated pump device capable of ensuring the fastening stability of the suction passage connecting portion.

  In order to achieve the above object, in the tank-integrated pump device according to the present invention, in the tank-integrated pump device including the pump device and the reservoir tank, the reservoir tank suction passage connection portion is inserted into the suction passage of the pump device. Of the imaginary line extending in the axial direction as a reference axis and the direction of the axis extending radially from the reference axis as the radial direction. The pair of coupling portions are arranged so as to sandwich the suction passage connecting portion in the radial direction outside the radial direction.

  Therefore, since the reservoir tank and the pump device are fastened with the suction passage connection portion sandwiched from both sides, the connection stability of the suction passage connection portion can be improved.

1 is a perspective view illustrating a tank-integrated pump device according to Embodiment 1. FIG. 1 is a front view illustrating a tank-integrated pump device according to Embodiment 1. FIG. 1 is a plan view illustrating a tank-integrated pump device according to Embodiment 1. FIG. 1 is a schematic diagram illustrating a configuration of a metal bush of Example 1. FIG. 1 is a cross-sectional view of a pump device of Example 1. FIG.

[Example 1]
1 is a perspective view illustrating a tank-integrated pump device according to the first embodiment, FIG. 2 is a front view illustrating the tank-integrated pump device according to the first embodiment, and FIG. 3 is a plan view illustrating the tank-integrated pump device according to the first embodiment. It is. The tank-integrated pump device according to the first embodiment is a power steering pump device that is mounted in an engine room of a vehicle and generates an assist force by supplying hydraulic fluid to the power steering device. Needless to say, the present invention may be applied not only to the power steering device but also to other fluid utilization devices such as a transmission and a variable valve timing mechanism. The tank-integrated pump device includes a pump device 10 driven by an engine (not shown) and a reservoir tank 20 that stores hydraulic fluid.

  The pump device 10 is a variable displacement vane pump that increases the cam ring eccentricity up to the desired discharge pressure to increase the discharge capacity, and when the desired discharge pressure is reached, reduces the cam ring eccentricity to reduce the discharge capacity. Lower. FIG. 5 is a cross-sectional view of the pump device according to the first embodiment. The pump device 10 includes a pump housing including a front body 11 in which a bottomed cylindrical pump element accommodating portion 11a is formed, and a rear body 12 that closes an opening of the front body 11. The front body 11 and the rear body 12 are positioned by locating pins 13 inserted into both bodies, and both bodies are assembled with high accuracy. A pump element 14 including a rotor, a plurality of vanes, a cam ring, and the like is rotationally driven by a drive shaft 15 that is pivotally supported by the front body 11 and the rear body 12.

  A discharge passage 16 that discharges hydraulic fluid to the power steering device is formed on the bottom surface of the front body 11 forming the pump element accommodating portion 11a. Further, a suction passage 12a connected to the suction pressure chamber of the pump element 14 is formed in a direction orthogonal to the drive shaft 15 of the rear body 12, and a suction passage opening 12b is formed in the pump housing external opening of the suction passage 12a. Is formed.

  The reservoir tank 20 has a cup-shaped first body portion 21 having a cylindrical suction passage connection portion 21f inserted into the suction passage opening portion 12b at the bottom, and an upper surface opening side of the first body portion 21. And a second main body portion 22 having an oil supply port 23 that is attached at a predetermined angle and supplies hydraulic fluid into the reservoir tank 20, and the hydraulic fluid is welded together by opening both of them. A reservoir tank 20 having a volume chamber for storing the is configured. Hereinafter, the insertion direction when the suction passage connecting portion 21f is inserted into the suction passage 12a is defined as the axial direction, and the substantially central line of the suction passage 12a among the imaginary lines extending in the axial direction is defined as the reference axis line 02. The direction of the axis extending in the radial direction is defined as the radial direction.

  The first main body portion 21 has a first convex portion 21a extending in the axial direction at a portion located in the axially upper portion of the tank side passage 25 formed in the suction passage connecting portion 21f, and the first convex portion 21a The right and left first recesses 21b and 21c are provided on both sides in the radial direction. Similarly, the second main body portion 22 has a second convex portion 22a at a position that is located above the tank side passage 25 in the axial direction and faces the first convex portion 21a. 1 Forms substantially the same plane as the right and left first recesses 21b, 21c formed in the main body 21. A passage 40 communicating with the tank side passage 25 is formed inside the second convex portion 22a and the first convex portion 21a. As described above, when the passage 40 is formed above the tank side passage 25, both the first main body portion 21 and the second main body portion 22 are formed so that one of the passages 40 is opened. When molding with a mold, the mold can be easily removed.

  Also, as shown in FIG. 3, in the plan view of the first main body 21, a second recess 21d is formed at a position facing the right and left first recesses 21b, 21c across the volume chamber. Yes. Metal bushing in which the first main body 21 is insert-molded (molded by embedding during resin molding) in the right and left first concave portions 21b, 21c and the second concave portion 21d formed in the first main body portion 21. Have 30. FIG. 4 is a schematic diagram illustrating the configuration of the metal bush of the first embodiment. The metal bush 30 is a cylindrical forged metal member having a through hole 31 into which bolts 1a, 1b, and 1c described later are inserted. Thereby, when the first main body 21 is assembled to the pump device 10, the axial force of the bolt 1 can be received by a metal material instead of a resin, and even if a large axial force is applied, excessive deformation of the bush can be suppressed. . In addition, a double-sided width 32 is formed on the outer periphery of the metal bush 30 and the resin sufficiently wraps around the double-sided width 32 during resin molding, so the metal bush 30 moves relative to the resin when tightened with the bolt 1. This prevents the joint around the bolt 1 and secures the mounting stability.

  The through holes 31 of the metal bush 30 of the right and left first recesses 21b and 21c are formed at positions facing the bolt holes formed in the radial direction of the rear body 12. Similarly, the through hole 31 of the metal bush 30 of the second recess 21d is formed at a position facing a bolt hole formed in the radial direction of the front body 11. As described above, since the front body 11 and the rear body 12 are positioned by the locate pin 13, the through hole 31 and the bolt hole can be made to coincide with each other with high accuracy. The bolt hole formed in the rear body 12 may be a bolt hole that has been conventionally used for fastening the connector hose. In this case, the addition of bolt holes can be suppressed to a minimum, processing costs and material costs can be reduced, and weight reduction can be achieved.

  On the bottom surface side of the second main body portion 22 where the oil supply port 23 is formed, there is a mounting horizontal surface 22b substantially parallel to a plane perpendicular to the direction 01 in which the oil supply port 23 extends. The oil supply port 23 is formed to extend vertically upward when the vehicle is mounted in order to avoid oil leakage during traveling and to facilitate oil supply during factory shipment or vehicle maintenance. Therefore, the plane perpendicular to the direction 01 extending vertically upward is a horizontal plane (hereinafter referred to as an on-board horizontal plane) when the vehicle is mounted. If there is a storage portion that protrudes above the horizontal plane when the vehicle is mounted, air easily accumulates there, which may lead to a decrease in pump performance. Therefore, by cutting a portion that protrudes upward from the in-vehicle horizontal plane, the in-mount horizontal plane 22b is formed to suppress the mixing of air.

(Assembly of pump device and reservoir tank)
Next, the assembling action of the pump device 10 and the reservoir tank 20 will be described. Here, description will be made using the vertical direction in the embodiment shown in FIG. An assembly surface for assembling the reservoir tank 20 is formed on the upper surface side of the pump device 10. In this assembly surface, a suction passage opening 12b connected to the suction passage 12a is formed in the rear body 12. A suction passage connecting portion 21f protruding downward from the reservoir tank 20 is inserted into the suction passage opening 12b from above. At this time, as shown in the enlarged sectional view of FIG. 2, the seal ring 27 is inserted between the suction passage opening 12b and the end face of the suction passage connection portion 21f to ensure the sealing performance.

  Then, the positions of the through holes 31 of the metal bush 30 provided in the right first recess 21b and the left first recess 21c and the bolt holes formed in the rear body 12 are aligned, and the metal bush 30 provided in the second recess 21d. The through holes 31 and the bolt holes formed in the front body 11 are aligned, and the bolts 1a, 1b, 1c are tightened and assembled. At this time, the head portions of the bolts 1a, 1b, and 1c are internal hexagonal bolts or Torx bolts having recesses formed on the inner peripheral side. Therefore, there is no need to mount a tightening socket on the outer periphery of the bolt head, so there is no need to secure a space around the bolt head, and the entire apparatus can be made compact. Since there is no obstacle above the recesses 21b, 21c, 21d, the tool can be easily used during assembly.

  In addition, the bolts 1a and 1b are tightened into the right first concave portion 21b and the left second concave portion 21c to constitute a pair of coupling portions, and by arranging the pair of coupling portions and the first convex portion 21a in proximity, Ensuring the fastening stability of the seal part. Further, since the bolts 1a and 1b are fastened so as to sandwich the first convex portion 21a from both sides by the pair of connecting portions, the fastening stability of the seal portion can be further ensured. In addition, the right and left first recesses 21b and 21c and the second recess 21d are arranged at a position straddling the volume chamber of the reservoir tank 20. The volume chamber becomes heavy when it is filled with hydraulic oil, but this volume chamber is not cantilevered but is supported by both ends, so the fastening stability of the reservoir tank 20 and the pump device 10 is improved by tightening stability. Can be secured.

[Effect of Example 1]
Hereinafter, effects produced by the device 1 of the first embodiment will be listed.
(1) Front body 11 (pump housing) having a pump element accommodating portion 11a therein, a drive shaft 15 pivotally supported by the front body 11 and the rear body 12 (pump housing), and a rear body 12 provided on the outside of the rear body 12 A suction passage 12a having a suction passage opening 12b that opens to the front body 11, a discharge passage 16 that is provided in the front body 11, discharges hydraulic fluid to a fluid utilization device, and is provided in the pump element housing portion 11a. A pump device 10 that is rotationally driven and includes a pump element 14 that discharges hydraulic fluid sucked from the suction passage 12a to the discharge passage 16, and a first main body portion 21 and a second main body portion 22 that store the hydraulic fluid ( Main body part), and a reservoir tank 20 provided with a pair of bolts 1a and 1b for coupling with the pump device 10, and a reservoir tank 20 provided in the reservoir tank 20, formed in a cylindrical shape, and an intake passage opening Through 12b In the tank-integrated pump device including the suction passage connection portion 21f that is inserted into the suction passage 12a and supplies hydraulic fluid to the pump device 10, the insertion direction when the suction passage connection portion 21f is inserted into the suction passage 12a Of the imaginary line extending in the axial direction is a reference axis line 02, and the axial direction extending radially from the reference axis line 02 is the radial direction, a pair of coupling portions Is a tank-integrated pump device that is arranged radially outside the suction passage connecting portion 21f and sandwiching the suction passage connecting portion 21f in the radial direction.
Therefore, since the suction passage connection portion 21f is clamped from both sides by the bolts 1a and 1b as a pair of coupling portions, the connection stability of the suction passage connection portion 21f can be ensured.

(2) In the tank-integrated pump device according to (1), the reservoir tank 20 has a first convex portion 21a and a second convex portion 22a (convex shape) above the reference axis 02 of the suction passage 12a. A tank-integrated pump device comprising a right first concave portion 21b and a left first concave portion 21c on both sides of the first convex portion 21a.
Therefore, it is possible to prevent the tools from interfering with the reservoir tank 20 when tightening the bolts 1a and 1b while securing the connection stability between the suction passage connecting portion 21f and the suction passage 12a, and easily assembled. it can.
(3) The tank-integrated pump device according to (2), wherein the tank-integrated pump device has a second convex portion 22a above the first convex portion 21a in the axial direction.
Therefore, when the first main body portion 21 and the second main body portion 22 are molded, since the convex shape is open, the mold can be easily removed.
(4) The tank-integrated pump device according to any one of (1) to (3) above, wherein the bolts 1a, 1b, and 1c are internal hexagon bolts or Torx bolts. .
Therefore, since a socket or the like is not used at the time of bolt tightening, interference between the tightening tool and the reservoir tank 20 can be avoided and can be easily assembled.

(5) In the tank-integrated pump device described in (4) above, the metal bush 30 is attached to the right and left first recesses 21b, 21c and the second recess 21d by insert molding.
That is, when tightened with an internal hexagon bolt or a Torx bolt, since the appropriate axial force is generally large, there is a concern about deformation of the resin. Therefore, by providing the metal bush 30 against this axial force, excessive deformation of the bush can be suppressed and fastening stability can be ensured.
(6) The tank-integrated pump device according to (5), wherein the metal bush 30 has a two-sided width 32 on the outer periphery.
Therefore, it is possible to restrict the relative movement between the metal bush 30 and the resin material of the first main body 21, and the effect of preventing rotation and retaining with respect to torque during bolt tightening can be obtained.
(7) In the tank-integrated pump device according to any one of (1) to (6) above, the bolts 1a, 1b, 1c are straddling both sides of the rear body 12 and the front body 11 positioned by the locate pin 13. A tank-integrated pump device characterized by being provided.
Therefore, since the accuracy of the relative position between the front body 11 and the rear body 12 is high, the mounting accuracy when the reservoir tank 20 is mounted can be improved.
(8) In the tank-integrated pump device according to any one of (1) to (7), the right and left first recesses 21b and 21c to which the bolts 1a and 1b are fastened, and the second to which the bolt 1c is fastened The recessed part 21d is a tank-integrated pump device characterized in that the recessed part 21d is disposed at a position straddling the volume chamber of the reservoir tank 20.
Therefore, the heavy volume chamber portion is not cantilevered but can be supported on both ends, and the mounting rigidity of the reservoir tank 20 can be improved.

(9) In the tank-integrated pump device according to any one of the above (1) to (7), only the oil supply port 23 is formed along a vertical direction when mounted on a vehicle. Body pump device.
That is, it is preferable that the oil supply port 23 is directed vertically upward so that oil can be easily supplied at the time of factory shipment after vehicle mounting or during vehicle maintenance. However, when the assembly angle and position of the pump device 10 to the engine are limited, the direction of the bolt holes formed in the pump device 10 is also limited. At this time, it is formed so that only the oil supply port 23 is directed vertically upward, and the bolts 1a, 1b, 1c and the suction passage connection portion 21f are formed according to the configuration on the pump device 10 side, so that the pump device 10 and Assembly with the reservoir tank 20 can be ensured.

(10) The tank-integrated pump device according to (9), wherein the tank-integrated pump has a mounting horizontal plane 22b substantially parallel to a plane orthogonal to the direction 01 in which the oil supply port 23 extends. apparatus.
If there is a volume chamber portion that protrudes from the horizontal plane when the vehicle is mounted, air accumulates there, which may cause deterioration in pump performance. Therefore, by forming the on-mounting horizontal surface 22b so that there is no portion protruding upward from the on-vehicle horizontal surface, mixing of air can be suppressed.
(11) In the tank-integrated pump device described in (1) to (10) above, the bolt holes of the pair of coupling portions provided on both sides of the suction passage connecting portion 21f are conventionally used for other purposes (for connector hose fastening). A tank-integrated pump device using the bolt holes used as
In this way, by using the existing configuration, it is possible to minimize the addition of new bolt holes, and it is possible to achieve a reduction in processing cost, weight reduction, and material cost reduction. The above-mentioned effects can be obtained by diverting the bolt holes used for other purposes as much as possible, not only for fastening the connector hose.

1a, 1b, 1c bolt
10 Pumping device
11 Front body
11a Pump element housing
12 Rear body
12a Suction passage
12b Suction passage opening
13 Locate pin
14 Pump elements
15 Drive shaft
16 Discharge passage
20 Reservoir tank
21 1st body part
21a 1st convex part
21b Suction passage connection
21b First recess on the right side (a pair of engaging parts)
21c Left first recess (a pair of engaging parts)
21d Second recess
21f Suction passage connection
22 Second body
22a Second convex part
22b Horizontal plane when mounted
23 Oil supply port
25 Tank side passage
27 Seal ring
30 metal bush
32 Width across flats

Claims (1)

A pump housing having a pump element housing therein;
A drive shaft pivotally supported by the pump housing;
A suction passage provided in the pump housing and having a suction passage opening that opens to the outside of the pump housing;
A discharge passage which is provided in the pump housing and discharges hydraulic fluid to the fluid utilization device;
A pump element that is provided in the pump element housing portion, is driven to rotate by the drive shaft, and discharges the working fluid sucked from the suction passage to the discharge passage;
A pump device comprising:
A reservoir tank comprising: a main body for storing hydraulic fluid; and a pair of coupling portions for coupling to the pump device;
A tank-integrated pump provided with the reservoir tank, and having a suction passage connection portion that is formed in a cylindrical shape, is inserted into the suction passage through the suction passage opening, and supplies hydraulic fluid to the pump device In the device
The insertion direction when the suction passage connection portion is inserted into the suction passage is defined as the axial direction, and of the virtual lines extending in the axial direction, the substantially central line of the suction passage is defined as the reference axis, and the radial direction extends from the reference axis. When the direction of the extending axis is a radial direction, the pair of coupling portions are arranged outside the suction passage connection portion and in the radial direction so as to sandwich the suction passage connection portion in the radial direction. A tank-integrated pump device.

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