JP2006138285A - Pump device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact pump device with a filter member arranged in a housing. <P>SOLUTION: The pump device comprises a pump chamber 2c formed in the housing, a pump part arranged in the pump chamber, a driving shaft 7 for driving the pump part, a suction passage formed in the housing 2 for communicating a reservoir with the pump chamber. The filter member 12 is arranged in the suction passage. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a pump device that is suitably used as a hydraulic pressure source such as a vehicle brake device, and more particularly to a filter disposed in a suction passage.

Conventionally, for example, a technique disclosed in Patent Document 1 has been disclosed as a pump device. In the pump device described in this publication, a pump assembly including a drive shaft that pivotally supports a drive gear and a driven shaft that pivotally supports a driven gear is housed in a main body case. In addition, a filter is provided in the reservoir for storing the liquid supplied to the pump assembly.
2001-342971 (refer FIG. 6)

  However, in the above-described prior art, since the filter and the pump assembly that are each completed as one part are separately arranged, there is a concern that the size of the pump device may be increased.

  The present invention has been made paying attention to the above-mentioned conventional problems, and aims to provide a compact pump device.

  In order to achieve the above-mentioned object, a gear pump according to the present invention is formed in a pump chamber formed in a housing, a pump portion disposed in the pump chamber, a drive shaft for driving the pump portion, and the housing. In the pump device including a suction passage that communicates the reservoir and the pump chamber, a filter member is disposed in the suction passage.

  Therefore, it becomes possible to arrange | position a filter member in a housing, and a compact pump apparatus can be provided, without causing the enlargement of an apparatus.

  The best mode for carrying out the present invention will be described below with reference to the drawings as an embodiment.

  First, the configuration will be described with reference to FIGS. 1 is a perspective view of the gear pump, FIG. 2 is a partial cross-sectional view of the gear pump along AA, FIG. 3 is a cross-sectional view of the gear pump along BB, and FIG.

  The gear pump according to the first embodiment includes a motor 1 for driving a pump, a housing 2 cut out from an aluminum alloy, and a cover member 3. Hereinafter, each component will be described in detail.

(About housing)
On the motor side surface 21 of the housing 2, a circular recess 2d for fixing the position of the motor 1 and a drive shaft insertion hole 2e into which the motor drive shaft 1a is inserted at the center of the recess 2d are formed. A seal member 14 that seals the cylinder hole 2c and the drive shaft insertion hole 2e in a liquid-tight manner and a holding member 13 that holds the seal member 14 are press-fitted into the drive shaft insertion hole 2e. The seal member 14 is disposed between a drive shaft 7 and a drive shaft insertion hole 2e described later. The holding member 13 has a bottomed cylindrical shape having an opening on the motor 1 side and a through hole through which the drive shaft 7 penetrates on the seal member 14 side, and is frictionally held between the cylindrical portion and the drive shaft insertion hole 2e. The position of the seal member 14 in the axial direction is regulated by the bottom.

  A cover side surface 22 of the housing 2 is formed with a cylinder hole 2c in which a pump assembly to be described later is accommodated, and two locate holes 2g for positioning the housing 2 and the cover member 3. A first suction passage 2a and a discharge passage 2b are formed in the upper surface 23 of the housing 2 in the direction of the cylinder hole 2c. The first suction passage 2a is formed on the axial motor 1 side from the bottom surface of the cylinder hole 2c, and is connected to a second suction passage 2f formed in the axial direction and perpendicular to the bottom surface of the cylinder hole 2c. . The discharge passage 2b is connected to the cylindrical side surface of the cylinder hole 2c.

(About pump assembly)
The pump assembly includes a drive shaft 7 connected to the motor drive shaft 1a by a connecting portion 71, and a driven shaft 8 that rotates by driving of the drive shaft 7 and has a low-pressure passage 81 formed in the shaft center portion. The drive shaft 7 is provided with a drive gear 9 that engages with the drive pin 72 inserted in the radial direction and rotates integrally with the drive shaft 7. The driven shaft 8 is provided with a driven gear 10 that engages with a drive pin 82 inserted in the radial direction and rotates integrally with the driven shaft 8. The drive shaft 7 is rotatably supported by a common side plate 11 and a drive side plate 5 arranged on the motor 1 side. The driven shaft 8 is rotatably supported by a common side plate 11 and a driven side plate 6 arranged on the motor 1 side. A filter member 12 is disposed between the common side plate 11 and the housing 2 so as to face the cylinder hole 2c.

[About cover members]
5 and 6 are enlarged views of the cover member. The cover member 3 includes a sealing portion 3 a that is inserted into the housing 2 (inside the cylinder hole 2 c) after being assembled with the housing 2, and a cover portion 3 b that is outside the housing 2. A drive side support hole 33 for inserting and supporting the drive side plate 5 and a driven side support hole 34 for inserting and supporting the driven side plate 6 are formed on the upper surface of the sealing portion 3a. Between the bottoms of the drive side support hole 33 and the driven side support hole 34 and the end part on the cover member 3 side when the drive side side plate 5 and the driven side plate 6 are respectively inserted, the drive side low pressure chamber 7a. And the driven side low pressure chamber 8a is formed. Further, the driven side low pressure chamber 8 a and the filter housing portion 113 of the common side plate 11 are connected by a low pressure passage 81 formed in the axis of the driven shaft 8.

  A drive side discharge path 36 is formed in the vicinity of the bottom of the drive side support hole 33 and in the direction of the driven side support hole 34. The drive side discharge passage 36 is formed substantially obliquely downward so as to be drilled from above the drive side support hole 33 with a drill or the like. Similarly, a driven side discharge passage 37 is formed in the vicinity of the bottom of the driven side support hole 34 and in the direction of the drive side support hole 33. The driven side discharge path 35 is also formed substantially obliquely downward so as to be drilled from the upper part of the driven side support hole 34 with a drill or the like, and is connected to the drive side discharge path 36. The drive side low pressure chamber 7a and the driven side low pressure chamber 8a communicate with each other by the drive side discharge path 36 and the driven side discharge path 37.

  A seal housing groove 31a for housing a seal member 31 that seals between the cylinder hole 2c and the seal portion 3a is formed on the outer periphery of the seal portion 3a. Two locating holes 32 for positioning with the housing 2 are formed symmetrically in the cover portion 3b, and bolt holes 38 for fixing the bolts to the housing 2 are equally arranged at four locations. Yes. A positioning hole 35 into which a positioning pin 30 for positioning the seal block 4 is inserted is formed on the upper surface of the sealing portion 3a.

[About seal block]
7, 8, 9, and 10 are enlarged views of the seal block 4. The seal block 4 is disposed so as to straddle both the outer periphery of the plate portions 5a and 6a of the driving side plate 5 and the driven side plate 6 and the outer periphery of the driving gear 9 and the driven gear 10. On the shaft center side of the seal block 4, a drive-side curved surface 43 that forms a seal surface between the drive-side side plate 5 and the tooth tips of the drive gear 9, and the tooth tips of the driven-side side plate 5 and the driven gear 10. A driven-side curved surface 44 that forms a seal surface is formed therebetween. In addition, a seal block side suction passage 42 (corresponding to the first hydraulic chamber described in the claims) is provided on the common side plate 11 side of the top portion 45 where both the driving side curved surface 43 and the driven side curved surface 44 abut. ) Is formed.

  The seal block side suction passage 42 is connected to the suction hole 115 of the common side plate 11. A contact surface 4 a that is in liquid-tight contact with the common side plate 11 is formed on the side surface of the seal block 4 in the motor 1 direction. The seal block side suction passage 42 is formed at a position that overlaps the outer periphery of the drive gear 9 and the driven gear 10, and the top portion 45 is formed at a position that overlaps the outer periphery of the plate portions 5 a and 6 a. In addition, a locating hole 41 into which a positioning pin 30 having a backlash is inserted is provided on the side surface of the seal block 4 in the cover member 3 direction. Thereby, the seal block 4 is allowed to move slightly with respect to the cover member 3.

[About the drive side plate]
11, 12, and 13 are enlarged views of the driving side plate 5. Since the basic configuration is the same as that of the driven side plate 6, only the driving side plate 5 will be described in detail. In addition, each component (5a: plate part, 5b: insertion part, 51: support hole, 52: seal member, 53: pin hole, 54: seal surface, 55: notch part, 56: pedestal of drive side plate 5 In the driven side plate 6, the following components (6a: plate portion, 6b: insertion portion, 61: support hole, 62: seal) 63, pin hole, 64: seal surface, 65: notch, 66: pedestal, 67: seal receiving groove, 68: gear seal surface).

  The drive side plate 5 is formed of an iron-based sintered material having excellent wear resistance, and has a support hole 51 that rotatably supports the drive shaft 7 and penetrates in the axial direction. Further, it has a plate portion 5 a that slides into contact with the side surface of the drive gear 9 to form a gear seal surface 58, and an insertion portion 5 b that is inserted into the cover member 3.

  The plate portion 5a has a cylindrical shape formed to have the same diameter as the outer diameter of the drive gear 9, and includes a seal surface 54 that is a cylindrical side surface, a cut portion 55 that is partially cut from both sides of the cylindrical side surface, A pedestal 56 is sandwiched between the portions 55.

  A pin hole 53 is formed in the pedestal portion 56 in the radial direction, and the connecting pin 50 is inserted with some backlash. The insertion portion 5b is formed with a seal housing groove 57 for housing a seal member 52 that seals between the cover member 3 and the outer periphery of the driving side plate 5. The driven side plate 6 having the same shape as the driving side plate 5 is coupled so that the base portions 56 come into contact with each other while allowing play by the connecting pins 50, thereby forming a side plate having a glasses shape.

  The driving side plate 5 and the driven side plate 6 form a notch 55 and a pedestal 56 by cutting a cylindrical member. Therefore, it is possible to perform surface processing of the outer periphery of the cylinder by rotational polishing before cutting, and achieve high-precision surface processing while ensuring ease of processing.

[About the common side plate]
14, 15, and 16 are enlarged views of the common side plate 11. The common side plate 11 has a cylindrical shape formed to have the same diameter as the inner diameter of the cylinder hole 2c, and is formed of an iron-based sintered material having excellent wear resistance. Further, on the side surface of the common side plate 11 on the motor 1 side, a filter housing portion 113 (corresponding to a concave portion described in the claims) having a diameter slightly smaller than that of the cylinder hole 2c and housing the filter member 12 is formed. ing.

  Further, a support hole 111 that rotatably supports the drive shaft 7 and penetrates in the axial direction, a support hole 112 that rotatably supports the driven shaft 8 and penetrates in the axial direction, and a suction hole 115 that sucks fluid are formed. . Further, a seal housing groove 114a for housing the seal member 114 is formed on the outer periphery of the common side plate 11, and seals between the outer periphery of the common side plate 11 and the cylinder hole 2c. A gear seal surface 116 is formed on the pump assembly side of the common side plate 11 and is in sliding contact with the side surfaces of the drive gear 9 and the driven gear 10 and in liquid-tight contact with the seal block 4.

  The gear seal surface 116 that forms a seal surface between the common side plate 11 and the seal block 4, the drive gear 9, and the driven gear 10 has a planar shape, and thus a highly accurate surface while ensuring ease of processing. Processing has been achieved.

[Filter members]
17, 18, and 19 are enlarged views of the filter member 12. The filter member 12 supports the circular frame 124 having the same diameter as the inner periphery of the filter housing portion 113 of the common side plate 11, the shaft outer frame 123 through which the drive shaft 7 passes, and the shaft outer frame 123 supported by the circular frame 124. The support frame 122 is arranged in a substantially cross shape. The support frame 122 is arranged in a substantially cross shape in the first embodiment, but may have other shapes as long as the shaft outer peripheral frame 123 can be held with respect to the circular frame 124 and is not particularly limited.

  The axial thickness of each frame 122, 123, 124 is formed slightly thicker than the axial depth of the filter housing portion 113. Thereby, the sealing performance in each frame portion is improved, and the sucked fluid is configured to always pass through the filter. Between the circular frame 124 and the shaft outer peripheral frame 123, a mesh 121 for filtering foreign matter in the fluid is provided.

  The mesh 121 is disposed substantially at the center in the axial direction of each frame 122, 123, 124. Here, the reason why it is arranged at substantially the center in the axial direction will be described. A second suction passage 2f is formed on the filter member 12 on the motor 1 side, while a suction hole 115 is formed on the pump assembly side. When the fluid is sucked by driving the pump, the mesh 121 becomes a resistance of the fluid. At this time, if the mesh 121 is disposed on the motor 1 side of each of the frames 122, 123, 124, for example, only fluid that has passed through the mesh 121 portion corresponding to the opening area of the second suction passage 2f can be sucked, and suction efficiency decreases. To do.

  On the other hand, if the mesh 121 is disposed on the pump assembly side of each frame 122, 123, 124, only the fluid that has passed through the mesh portion corresponding to the opening area of the suction hole 115 can be sucked, and the suction efficiency is also lowered.

  On the other hand, when the mesh 121 is disposed substantially at the center in the axial direction of each of the frames 122, 123, 124, the fluid sucked from the second suction passage 2f passes through the area portion of the circular frame 124, and from the same area portion, the suction hole Fluid is drawn into 115. That is, when the fluid passes through the mesh 121, it can be passed through a region having a wide opening area, and the suction resistance can be reduced as much as possible.

(About pump drive action)
Next, the pump driving action will be described. When the motor 1 is driven, the drive gear 9 is driven by the drive shaft 7, and the driven gear 10 is driven accordingly. Then, the fluid is sucked from the first suction passage 2 a and the second suction passage 2 f, and the fluid is introduced into the filter housing portion 113 provided in the common side plate 11. The introduced fluid passes through the entire mesh 121 of the filter member 12. The fluid that has passed through the mesh 121 is introduced into the seal block side suction passage 42 from the suction hole 115 provided in the common side plate 11, and a high pressure is introduced into the cylinder hole 2 c through the engagement of the drive gear 9 and the driven gear 10. Fluid is discharged.

  While the high pressure fluid acts on the entire outer periphery of the pump assembly, the seal block side suction passage 42 acts on the seal block side suction passage 42, so that the components of the pump assembly are aggregated around the seal block side suction passage 42. Specifically, the common side plate 11, the driving side plate 5, the driven side plate 6, and the seal block 4 are aggregated.

  Therefore, the liquid tightness of the drive gear 9 and the driven gear 10 and the gear seal surface 116 of the common side plate 11 is improved. Further, the driving side plate 7 and the driven side plate 8 are independent members, and are pin-coupled with backlash. Further, since the seal block 4 is also pin-coupled to the cover member 3, the drive side curved surface 43, the driven side curved surface 44 and the seal surface 54 of the seal block 4 are at positions where the sealing performance is most enhanced. It is prescribed. Therefore, the liquid tightness between the drive gear 9 and the seal surface 54 of the drive side plate 7 is improved, and the liquid tightness between the driven gear 10 and the seal surface 64 of the driven side plate 8 is improved.

  Further, the liquid tightness between the tooth tip of the drive gear 9 and the drive side curved surface 43 of the seal block 4 is improved. Further, the liquid tightness between the tooth tip of the driven gear 10 and the driven curved surface 44 of the seal block is improved. Further, the liquid tightness between the contact surface 4a of the seal block 4 and the gear seal surface 116 of the common side plate is improved.

  A seal member 114 provided on the outer periphery of the common side plate 11, a seal member 31 provided on the outer periphery of the sealing portion 3a of the cover member 3, a seal member 52 provided on the driving side plate 5, and a driven side The cylinder hole 2 c is liquid-tight by a seal member 62 provided on the side plate 6. Therefore, the high-pressure fluid in the cylinder hole 2c outputs the high-pressure fluid from the discharge passage 2b connected to the cylindrical portion of the cylinder hole 2c to a fluid pressure operating device (not shown) disposed outside the housing 2.

(Leakage action)
Next, the action of the leaked fluid when the pump is driven will be described. When the pump is driven, the outer periphery of the pump assembly is at a high pressure, and the seal block side suction passage 42 is at a low pressure, so that fluid leaks from the side surfaces of the drive gear 9 and the driven gear 10 toward the drive shaft 7 and the driven shaft 8. To do. The leaked fluid is guided to the drive-side low-pressure chamber 7 a through the gap between the support hole 51 of the drive-side side plate 5 and the drive shaft 7. Similarly, it is guided to the driven side low pressure chamber 8a through the gap between the support hole 61 of the driven side plate 6 and the driven shaft 8.

  The fluid leaking to the driving side low pressure chamber 7a is guided to the driven side low pressure chamber 8a through the driving side discharge path 36 and the driven side discharge path 37. The fluid introduced into the driven side low pressure chamber 8 a is introduced into the filter housing portion 113 via the low pressure passage 81. Thus, by circulating the leaked fluid, it is possible to improve the lubrication and cooling effect of the sliding portion, and to improve the durability of the bearing function.

  Further, since the driving side low pressure chamber 7a and the driven side low pressure chamber 8a are in communication with the filter housing portion 113 on the suction side, a low pressure can always be ensured. Therefore, a portion through which the leaked fluid passes can always be secured at a low pressure. That is, since the outer periphery of the pump assembly is at a high pressure, the contact pressure acting on the portion through which the leaked fluid passes (ensuring low pressure) can be controlled. Further, by circulating the leaked fluid, the vacuum filling property can be improved and the remaining air can be reduced.

As described above, in the configuration of the first embodiment, the following effects can be obtained.
(1). The filter member 12 was disposed facing the cylinder hole 2c. Therefore, it becomes possible to install the pump assembly in the cylinder hole 2c at the same time, and the assembling property can be improved. Moreover, the processing only for filter installation etc. is not required.

  (2) The common side plate 11 is provided with a suction hole 115 communicating the suction passage and the seal block side suction passage 42, and the filter member 12 is disposed adjacent to the suction hole 115. Therefore, it becomes possible to arrange the filter member 12 on the common side plate 11, and the cost can be reduced by reducing the number of processing steps.

  (3) A filter housing portion 113 that is a recess having an area larger than the cross-sectional area of the suction passage 2 f is formed on the surface of the common side plate 11 facing the housing 2, and the filter member is disposed on the filter housing portion 113. Therefore, when the fluid passes through the filter member 12, the cross-sectional area of the flow path can be increased, and the suction efficiency can be improved by preventing an increase in flow path resistance.

  (4) The axial thickness of each frame 122, 123, 124 is formed slightly thicker than the axial depth of the filter housing portion 113. Thereby, the sealing performance in each frame part is improved, and the sucked fluid can always pass through the filter.

  (5) The mesh 121 is disposed at the approximate center in the axial direction of each of the frames 122, 123, and 124. Therefore, the fluid sucked from the second suction passage 2f passes through the area portion of the circular frame 124, and the fluid is sucked into the suction hole 115 from the same area portion. That is, when the fluid passes through the mesh 121, it can be passed through a region having a wide opening area, and the suction resistance can be reduced as much as possible.

  (6) The common side plate 11 is provided with a planar gear seal surface 116 that forms a seal surface between the seal block 4, the drive gear 9 and the driven gear 10. In a well-known gear pump having a so-called seal block, a seal surface is formed between the outer periphery of the spectacle-shaped side plate and the seal block. It was necessary to process, leading to an increase in processing cost. On the other hand, since the common side plate 11 has a planar shape, highly accurate surface processing can be achieved while ensuring ease of processing.

  (7) Since the seal block 4 is also a planar contact surface 4a, highly accurate surface processing can be achieved while ensuring ease of processing.

  (8) Since the common side plate 11 and the seal block 4 are brought into plane contact, the shape and size of the common side plate 11 are affected by the shape and size when the drive gear 9 and the driven gear 10 are engaged. Instead, it can be circular and have a large diameter. Therefore, processability can be ensured.

  Next, Example 2 will be described. Since the basic configuration is the same as that of the first embodiment, only different points will be described. FIG. 20 is a cross-sectional view of a pump device in which the filter member 15 is disposed in the suction passage formed in the housing 2. The housing 2 is connected to the first suction passage 2a by a third suction passage 20a formed in the same direction as the pump drive shaft 1a from the motor side surface 21. On the upper surface 23 side of the first suction passage 2a, a filter housing portion 21a having a diameter larger than that of the first suction passage 2a is formed.

  A cylindrical filter 15 in which a mesh is disposed in the cylindrical portion is inserted from the upper surface 23 into the filter housing portion 21a. The cylindrical filter 15 is sealed with a sealing member 151 fixed to the upper surface 23 of the housing 2 with a bolt 152. Thus, by arranging the cylindrical filter 15 in the housing 2, it is not necessary to separately provide pipe connection for the filter or a dedicated space, and the pump device as a whole can be reduced in size.

It is a perspective view showing the gear pump of Example 1. FIG. It is AA sectional drawing showing the gear pump of Example 1. FIG. It is BB sectional drawing showing the gear pump of Example 1. FIG. 1 is an exploded configuration diagram illustrating a gear pump according to Embodiment 1. FIG. 3 is a front view illustrating a cover member of Example 1. FIG. 3 is a cross-sectional view illustrating a cover member of Example 1. FIG. FIG. 3 is a front view illustrating a seal block according to the first embodiment. It is a rear view showing the seal block of Example 1. FIG. It is a bottom view showing the seal block of Example 1. FIG. FIG. 3 is a perspective view illustrating a seal block according to the first embodiment. FIG. 3 is a front view illustrating a driving side plate according to the first embodiment. FIG. 3 is a side view illustrating a driving side plate according to the first embodiment. FIG. 3 is a perspective view illustrating a driving side plate according to the first embodiment. 3 is a front view illustrating a common side plate of Example 1. FIG. FIG. 3 is a side view illustrating a common side plate according to the first embodiment. 3 is a perspective view illustrating a common side plate according to Embodiment 1. FIG. 3 is a front view illustrating a filter member of Example 1. FIG. 3 is a side view illustrating a filter member of Example 1. FIG. 3 is a perspective view illustrating a filter member of Example 1. FIG. It is sectional drawing showing the gear pump of Example 2. FIG.

Explanation of symbols

2 Housing 2c Cylinder hole (pump chamber)
7 Drive shaft 2a First suction passage 2f Second suction passage 12 Filter member 15 Cylindrical filter 20a Third suction passage

Claims (4)

A pump chamber formed in the housing;
A pump unit disposed in the pump chamber;
A drive shaft for driving the pump unit;
A suction passage formed in the housing and communicating between the reservoir and the pump chamber;
In a pump device comprising:
A pump device comprising a filter member disposed in the suction passage. The pump device according to claim 1,
The said filter member is arrange | positioned facing the said pump chamber, The pump apparatus characterized by the above-mentioned. The pump device according to claim 1,
The pump unit includes a driving side gear supported by the driving shaft, a driven side gear supported by the driven shaft, and a side plate provided on the axial side of the driving side gear and the driven side gear. And a seal block that seals the tooth tips of each gear and forms a first hydraulic chamber by contact with the seal surface with the side plate,
A pump device, wherein a communication passage that communicates the suction passage and the first hydraulic chamber is provided in the side plate, and a filter member is disposed in the communication passage. The pump device according to claim 3,
A pump device comprising: a concave portion having an area larger than a cross-sectional area of the suction passage formed on a surface of the side plate facing the housing; and a filter member disposed in the concave portion.

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