Pumping device

Abstract

It is precisely positioned relative to the connected part to suppress leakage at the inlet or outlet. [Solution] The pump device 1 comprises a pump unit 6, a housing body 21 that houses the pump unit 6, and a cover 22 that covers the opening 21a of the housing body 21, and is fixed to the case 11 of the transaxle 10 in the housing body 21. The cover 22 has a fluid intake port 15 and an outlet port for the pump unit 6, and contacts the contact surface of the bottom surface 19 of the recess 13 of the case 11, so that the first port 17 provided on the contact surface communicates with the intake port 15, and the second port communicates with the outlet port. Furthermore, a pump-side pin hole is provided adjacent to the outlet port of the cover 22, into which a pin 41 for positioning the case 11 and the cover 22 is inserted.

Description

Technical Field

[0001] The present invention relates to an attachment structure of a pump device.

Background Art

[0002] For example, when connecting the suction port and the discharge port of a pump device to a connected part and fixing the pump device to the connected part, such as an electric pump attached to a transmission.

[0003] For example, in Patent Document 1, the suction port of the pump device protrudes outward, and a protruding portion (convex portion) of the suction port is inserted into the connected part side, and there is a hole provided with a port connected to the suction port. Further, a pin for locking the housing of the pump device and the connected part is provided, and the positioning of the pump and the connected part is achieved by the locking by the pin and inserting the convex portion into the hole of the connected part.

[0004] Also, in Patent Document 1, in order to prevent fluid leakage at the connection part between the hole of the connected part and the convex portion, an O-ring is arranged around the cylindrical convex portion.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in Patent Document 1, since the suction port of the pump has a protruding shape and the convex portion of the pump is inserted into the hole of the connected part, the shapes of the convex portion of the pump and the connected part are complicated and require accuracy, resulting in a problem of increasing the component cost.

[0007] Furthermore, even a slight misalignment between the pump and the connected part can cause the O-rings around the pump's protrusions to be unevenly compressed, compromising the airtight seal provided by the O-rings.

[0008] The present invention aims to provide a pump device that reduces component costs with a simple configuration while improving the airtightness of the connection part of the inlet or outlet. [Means for solving the problem]

[0009] To achieve the above objective, the pump device of the present invention comprises a pump section, a housing body section having an opening and housing the pump section inside, and a cover section covering the opening of the housing body section, wherein the pump device is fixed to a connected section in the housing body section, and the cover section is formed to communicate with a fluid port provided in the connected section, and comprises at least one of a fluid inlet and discharge port in the pump section, and a positioning section positioned adjacent to at least one of the inlet and discharge port for positioning relative to the connected section. [Effects of the Invention]

[0010] According to the pump device of the present invention, the cover portion and the case are positioned by the positioning portion, so that at least one of the suction port and discharge port adjacent to the positioning portion and the fluid port of the connected portion can be accurately positioned, and the airtightness at the connection portion of at least one of the suction port and discharge port can be ensured, thereby suppressing fluid leakage.

[0011] Furthermore, since at least one of the discharge port and the suction port, as well as the positioning part, are both located on the cover, there is no need to precisely align the housing body with the connected part. This reduces the precision requirements for the pump device's housing body and lowers the manufacturing cost of the housing body. [Brief explanation of the drawing]

[0012] [Figure 1] This is a perspective view showing the external shape of a pump device according to an embodiment of the present invention. [Figure 2] This is a bottom view of the pump device of this embodiment, showing the intake and discharge ports. [Figure 3] This is a cross-sectional view of the connection between the pump device and the transaxle of this embodiment. [Figure 4] This is an explanatory diagram showing the position of the positioning part in the cover section. [Figure 5] This is an explanatory diagram of the positioning part at the connection point of the transaxle. [Modes for carrying out the invention]

[0013] An embodiment of the present invention will be described below with reference to the drawings.

[0014] Figure 1 is a perspective view showing the external shape of a pump device 1 according to an embodiment of the present invention. Figure 2 is a bottom view of the pump device 1 of the embodiment, showing the inlet 15 and outlet 16. Figure 3 is a cross-sectional view of the connection between the pump device 1 and the transaxle 10 of this embodiment. Note that Figure 3 is a cross-sectional view of part AA shown in Figure 2. Figure 4 is an explanatory diagram showing the position of the positioning part in the cover part 22. Figure 5 is an explanatory diagram showing the position of the positioning part in the connection part of the transaxle 10.

[0015] As shown in Figures 1 to 3, the pump device 1 of the embodiment of the present invention is a device for circulating lubricating and cooling oil (ATF) to, for example, a vehicle transaxle 10, and is an electric pump equipped with an electric motor unit 5 and a pump unit 6.

[0016] The pump device 1 is fixed to the case 11 (the connected part) of the transaxle 10 by a plurality of bolts 12. The pump device 1 has a suction port 15 for sucking ATF which is a fluid, and a discharge port 16 for discharging the ATF. The case 11 of the transaxle 10 is provided with a recess 13 in which the pump device 1 is housed. The bottom surface 19 (the connecting part) of the recess 13 is provided with a first port 17 (fluid port) connected to the suction port 15 and a second port 18 (fluid port) connected to the discharge port 16 of the pump device 1.

[0017] The pump device 1 is configured by housing an electric motor part 5 and a pump part 6 in a housing 20.

[0018] The housing 20 has a cylindrical housing main body part 21 and a cover part 22.

[0019] The housing main body part 21 has an open end. One opening 21a of the housing main body part 21 is covered by the cover part 22. The pump part 6 and the electric motor part 5 are arranged side by side on the axis La of the housing main body part 21, and the pump part 6 is arranged on the opening 21a side of the housing main body part 21.

[0020] An outer peripheral part of an end portion of the housing main body part 21 on the side opposite to the opening 21a is provided with a flange part 23 protruding radially outward. The flange part 23 protrudes so as to overlap with an edge part of the recess 13 of the case 11. A plurality of bolt holes 24 for inserting the bolts 12 are formed in the flange part 23, and the housing main body part 21 is fixed to the surface of the case 11 of the transaxle 10 by the bolts 12.

[0021] The cover part 22 is a plate-like member and is provided with a suction port 15 and a discharge port 16.

[0022] As shown in FIGS. 4 and 5, the suction port 15 is provided in a boss part 30 protruding outward (toward the bottom surface 19 of the case 11) of the cover part 22, and the discharge port 16 is provided in a boss part 31 (the second boss part) protruding outward of the cover part 22 in the same manner as the boss part 30.

[0023] The bottom surface 19 of the recess 13 provided in the case 11 has an annular contact surface 32a that contacts the protruding surface 30a of the boss portion 30 when the pump device 1 is fixed to the case 11 of the transaxle 10 by bolts 12, and an annular contact surface 33a that contacts the protruding surface 31a of the boss portion 31. The first port 17 is open in the contact surface 32a, and the second port 18 is open in the contact surface 33a.

[0024] The protruding surface 30a and the contact surface 32a, and the protruding surface 31a and the contact surface 33a are all planes perpendicular to the axis La of the pump device 1 fixed to the case 11.

[0025] An annular plate-shaped seal ring 38 is sandwiched between the protruding surface 30a of the boss portion 30 and the contact surface 32a, and between the protruding surface 31a of the boss portion 31 and the contact surface 33a.

[0026] As shown in Figure 4, the intake port 15 and the discharge port 16 are arranged side by side, with the center C of the cover portion 22 in between.

[0027] The cover portion 22 and the housing body portion 21 are fixed together by three bolts 35. Three bolt holes 36 are provided near the outer circumference of the cover portion 22 into which the bolts 35 are inserted. One bolt hole 36 (36a) is provided on one side of the line connecting the intake port 15 and the discharge port 16, and two bolt holes 36 (36b, 36c) are provided on the other side. The bolt holes 36a, 36b, and 36c are arranged in the cover portion 22 as far apart as possible from each other.

[0028] Furthermore, the cover portion 22 and the case 11 are positioned relative to each other at two points by two rod-shaped pins 41.

[0029] The cover portion 22 is provided with pump-side pin holes 43 (43a, 43b) (hole portion, positioning portion) into which the end of the pin 41 is inserted, and the bottom surface 19 of the case 11 is provided with case-side pin holes 42 (42a, 42b) into which the end of the pin 41 is inserted.

[0030] The case-side pin holes 42 and pump-side pin holes 43 face each other in pairs, their axes are on the same line, and they are formed parallel to the axis La of the housing body 21. The length of the pin 41 and the depth of the case-side pin hole 42 are set so that when one end of the pin 41 is inserted all the way into the case-side pin hole 42, the other end of the pin 41 protrudes from the case-side pin hole 42.

[0031] Then, with one end of the pin 41 inserted into the pin hole 42 on the case side, the other end of the pin 41 is inserted into the pin hole 43 on the pump side, thereby positioning the case 11 and the cover portion 22, that is, positioning the transaxle 10 and the pump device 1.

[0032] The pump-side pin holes 43 are located near the outer circumference of the cover portion 22, and one hole (43a) is provided on one side (43a) and one hole (43b) on the other side of the line connecting the inlet 15 and the outlet 16 of the cover portion 22.

[0033] Furthermore, the pump-side pin holes 43 (43a, 43b) are provided on the boss portion 44 (first boss portion) that protrudes outward from the cover portion 22.

[0034] One of the two pump-side pin holes 43, pump-side pin hole 43a, is positioned adjacent to the discharge port 16, and the boss portion 31 around the discharge port 16 and the boss portion 44 around the pump-side pin hole 43a are positioned so that they partially overlap each other.

[0035] As described above, in this embodiment, when fixing the pump device 1 to the case 11 of the transaxle 10, the pump device 1 is positioned so that the inlet 15 of the pump device 1 and the first port 17 of the case 11 are connected, and the pump device 1's outlet 16 and the second port 18 of the case 11 are connected, and then fixed with bolts 12.

[0036] The inlet 15 and outlet 16 of the pump device 1 are provided on a cover portion 22 fixed to the housing body portion 21. The relative positions of the cover portion 22 and the case 11 are defined by a pin 41.

[0037] In this way, the pin 41 positions the cover portion 22 and the case 11, allowing for precise positioning of the intake port 15 and the first port 17, and the discharge port 16 and the second port 18. This suppresses twisting of the seal ring 38 at the connection points between the intake port 15 and the first port 17, and between the discharge port 16 and the second port 18, allowing the seal ring 38 to function properly and suppress liquid leakage.

[0038] In this embodiment, the discharge port 16 and the inlet port 15, as well as the pump-side pin holes 43a and 43b, are all located on the cover portion 22, and the case 11 and the cover portion 22 are not directly fixed to each other, so there is no need to accurately align the housing body portion 21 with respect to the case 11.

[0039] As a result, in order to align the inlet 15 and outlet 16 of the pump device 1 with respect to the case 11, only the cover portion 22 needs to be manufactured with high precision, and there is no need to manufacture the housing body portion 21 with high precision, thus reducing the manufacturing cost of the housing 20.

[0040] Furthermore, since the suction port 15 and discharge port 16 and the positioning portion by the pin 41 are located adjacent to each other in the cover portion 22, the suction port 15 and discharge port 16 can be aligned more accurately.

[0041] In this embodiment, the inlet 15 and outlet 16 are arranged side by side on the cover portion 22 with the central part C in between, and two positioning points by pins 41 are provided on either side of the line connecting the inlet 15 and the outlet 16. Therefore, the positioning of both the inlet 15 and the outlet 16 can be accurately performed while limiting the installation of positioning points by pins 41 to just two locations.

[0042] Furthermore, the cover portion 22 is a substantially disc-shaped member, and the pump-side pin holes 43 into which the pins 41 are inserted are provided in two locations adjacent to the outer peripheral end of the cover portion 22, flanking the center C of the cover portion 22. This allows for a large distance between the two pump-side pin holes 43 in the cover portion 22, enabling the cover portion 22 to be positioned with high overall accuracy by the two pins 41. In particular, since one of the pump-side pin holes 43a is positioned adjacent to the discharge port 16, the positioning of the discharge port 16 and the first port 17 can be performed with even greater accuracy.

[0043] The cover portion 22 and the case 11 are positioned by the case-side pin holes 42 (42a, 42b) provided in the case 11, the pump-side pin holes 43 (43a, 43b) provided in the cover portion 22, and the pin 41. This configuration allows for positioning of the case 11 and the cover portion 22 with a simple configuration, thereby reducing the cost of parts required for positioning.

[0044] The pump-side pin holes 43a and 43b provided in the cover portion 22 are located on cylindrical boss portions 44 formed in the cover portion 22 to ensure sufficient insertion depth for the pin 41. The suction port 15 is also located on a cylindrical boss portion 30 formed in the cover portion 22. Boss portions 44 and 30 overlap each other to some extent. This further reduces the distance between the discharge port 16 and the pump-side pin hole 43a, improving the alignment accuracy at the discharge port 16, and also reduces the total volume of boss portions 44 and 30 in the cover portion 22, thereby reducing the weight of the cover portion 22.

[0045] This concludes the description of the embodiments, but the aspects of the present invention are not limited to these embodiments. The details of the control in these embodiments may be modified as appropriate.

[0046] For example, in the above embodiment, the cover portion 22 is provided with an intake port 15 and an outlet port 16, but only one of these may be provided on the cover portion 22. In this case, the intake port 15 or the outlet port 16 provided on the cover portion 22 can be precisely positioned by the pin 41 at adjacent positions.

[0047] In the cover portion 22, the number and position of the pins 41, i.e., the positioning parts, may be changed as appropriate. Also, the positioning parts that position the cover portion 22 and the case may be made of something other than pins. In this invention, it is sufficient that at least one positioning part is arranged adjacent to either the intake port 15 or the discharge port 16.

[0048] Furthermore, the pump device of the present invention may be fixed to a device other than a transaxle. [Explanation of symbols]

[0049] 1. Pumping device 6. Pump section 11 Case (connected part) 15 Inlet 16 Outlet 17. First port (fluid inlet) 18. Second port (fluid inlet) 21 Housing main body 22 Cover section 31 Boss Section (Second Boss Section) 32a, 33a contact surface 41 pins 43 Pump-side pin hole (hole section, positioning section) 44 Boss Section (First Boss Section) C center

Claims

1. Pump section and A housing body having an opening and housing the pump unit inside, A cover portion that covers the opening of the housing body, A pump device having, which is fixed to the connected portion in the housing body, The aforementioned cover portion is A fluid inlet and outlet of the pump section, formed to communicate with the fluid port provided in the connected section, A positioning unit is positioned adjacent to at least one of the aforementioned intake port and discharge port, and is used to position the connected portion. A pump device characterized by having the following features.

2. The cover portion has the intake port and the discharge port arranged side by side. The pump device according to claim 1, characterized in that the positioning portion is provided in two locations on either side of the line connecting the inlet and the outlet.

3. The cover portion is a plate-shaped member, The positioning portion is provided in two locations adjacent to the outer peripheral end of the cover portion, sandwiching the center of the cover portion. The pump device according to claim 1, characterized in that one of the positioning parts is located adjacent to either the inlet or the outlet.

4. The pump device according to claim 1, characterized in that the positioning portion is composed of a hole into which a pin is inserted.

5. The cover portion has a first boss portion provided with the hole portion and a second boss portion provided with either the intake port or the discharge port, The pump device according to claim 4, characterized in that the first boss portion and the second boss portion partially overlap each other and are formed in the cover portion.

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