JP6402862B2 - Gear pump or gear motor - Google Patents

Description

  The present invention relates to a gear pump or gear motor including a drive gear and a driven gear configured as, for example, a spur gear.

  Conventionally, some gear pumps include a driving gear and a driven gear that mesh with each other. In the gear pump, the gap between the side surface of the gear and the casing facing the side surface is preferably narrow because the internal leakage of the pump is reduced. In order to achieve this purpose, a pressure balance type side plate is currently employed, and the gap is actively narrowed. In the conventional gear pump, as shown in FIGS. 6 and 7, the side plate 121 has a shaft hole 121a through which the shafts of the drive gear and the driven gear pass, and are in sliding contact with the end surfaces of the drive gear and the driven gear. A groove portion 12ba is formed on the surface of the bearing members 12, 112 on the side plate 121 side, and an inner space of the casing is formed in the groove portion 12ba between the side plate 121 and the bearing members 12, 112 of the drive gear and the driven gear. A gasket 12bb that partitions the low-pressure space 10a and the high-pressure space 10b is disposed.

Japanese Patent Laying-Open No. 2015-83831

  In the conventional gear pump, as shown in FIG. 7 (cross section seen from the line AA in FIG. 6), a part of the working fluid leaking on the side surface of the drive gear causes the drive gear shaft 4b of the drive gear to move. It is supplied to the bearing portion of the supported bearing member 12, passes through the passage 9 a, flows into the low pressure space 10 a (shown by a solid line arrow), and the remaining working fluid passes through the gap between the side plate 121 and the bearing member 12. 10a (indicated by dotted arrows). Thus, in the gear pump, it is better that the leakage of the working fluid on the side surface of the gear is better, but part of the leaked working fluid flows into the bearing portion of the gear, which is useful for lubrication and cooling of the bearing portion. On the other hand, the remaining working fluid flows into the low-pressure space 10a through the gap between the side plate 121 and the bearing member 12, and is not useful for lubricating and cooling the bearing portion.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a gear pump or a gear motor that improves the lubricity of the bearing portion by oil leaking from the end face of the gear.

A gear pump or a gear motor according to a first aspect of the present invention includes a drive gear that meshes with each other in an internal space of a casing and that abuts against an inner peripheral surface of the internal space to partition the internal space into a high-pressure space and a low-pressure space, and a driven gear, a bearing member for supporting the shaft of the drive gear and the driven gear, wherein disposed between the drive gear and an end face of the driven gear and the bearing member, the shaft of the drive gear and the driven gear and a side plate having a shaft hole that passes between the bearing member and the side plate includes a first gasket for partitioning said high pressure space and the low-pressure space, the in the low-pressure space side of the first gasket communicating axial bore and said and a second gasket is arranged that partitions the low-pressure space, said casing, a gap between the end of the said casing axis, and said low-pressure space Characterized in that it is the passage to be formed.

  In this gear pump or motor, the oil leaked between the end faces of the drive gear and the driven gear and the side plate can be prevented from passing between the side plate and the bearing member and flowing into the low pressure space. Therefore, oil leaking between the end faces of the drive gear and the driven gear and the side plate passes through the bearing portions of the drive gear and the driven gear, flows into the low pressure space, and the lubricity of the bearing portion is improved.

A gear pump or gear motor according to the second invention, the bearing member, the side plates and the opposed groove is formed, the second gasket is disposed in the groove, characterized in Tei Rukoto.

  In this gear pump or motor, the second gasket can be easily disposed between the side plate and the bearing member by disposing the second gasket in the groove portion of the bearing member.

  In the first invention, it is possible to prevent oil leaking between the end faces of the drive gear and the driven gear and the side plate from passing between the side plate and the bearing member and flowing into the low pressure space. Therefore, oil leaking between the end faces of the drive gear and the driven gear and the side plate passes through the bearing portions of the drive gear and the driven gear, flows into the low pressure space, and the lubricity of the bearing portion is improved.

  In 2nd invention, a 2nd gasket can be easily arrange | positioned between a side plate and a bearing member by arrange | positioning a 2nd gasket in the groove part of a bearing member.

It is a figure explaining the whole gear pump composition concerning an embodiment of the present invention. It is sectional drawing in the II-II line of FIG. It is sectional drawing in the III-III line of FIG. 1, and is a figure of a bearing member. It is sectional drawing of the principal part of the gear pump of FIG. It is a figure explaining the whole gear pump composition concerning other embodiments of the present invention. It is a figure of the bearing member of the conventional gear pump. It is sectional drawing of the principal part of the conventional gear pump.

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

  As shown in FIG. 1, the gear pump 1 includes a driving gear 2 and a driven gear 3 that mesh with each other, driving gear shafts 4 a and 4 b and driven gear shafts 5 a and 5 b that respectively support the driving gear 2 and the driven gear 3. A drive gear 2, a driven gear 3, a drive gear shaft 4a, 4b, and a casing 6 that houses the driven gear shafts 5a, 5b are provided. The gear pump 1 according to the present embodiment sucks and pressurizes the working fluid supplied from a tank that stores the working fluid (for example, working oil), discharges the working fluid, and supplies it to the hydraulic equipment.

  The casing 6 includes a main body 7 having an internal space 10 having a cross-sectional shape of approximately eight, a mounting 8 screwed to one end face of the main body 7, and a cover 9 screwed to the other end face of the main body 7. have. In the gear pump 1, the internal space 10 formed inside the main body 7 is closed by the mounting 8 and the cover 9. The casing 6 includes bearing members 11 and 12 and bearing members 111 and 112 that support the drive gear 2 and the driven gear 3 inserted into the internal space 10.

  As shown in FIGS. 1 and 2, the drive gear 2 and the driven gear 3 are each configured as a spur gear and inserted into an internal space 10 formed inside the casing 6. In the internal space 10, the drive gear shafts 4 a and 4 b extend from both end surfaces of the drive gear 2 along the axial direction, and the driven gear shafts 5 a and 5 b extend from both end surfaces of the driven gear 3 along the axial direction. Established. The drive gear shaft 4a is inserted through an insertion hole 8a formed in the mounting 8, and a drive means (not shown) is connected to the end of the drive gear shaft 4a.

  In the gear pump 1, the drive gear 2 and the driven gear 3 are accommodated in the internal space 10 in a state of being engaged with each other, and the tooth tips thereof are in sliding contact with the inner peripheral surface of the internal space 10. Thereby, the drive gear 2 and the driven gear 3 rotate while meshing in the internal space of the casing 6. When the drive gear 2 and the driven gear 3 are rotated, they abut against the inner peripheral surface of the internal space of the casing 6 to divide the internal space 10 into a low pressure space 10a and a high pressure space 10b.

  In FIG. 1, the casing 6 supports a bearing member 11 that supports a drive gear shaft 4 a extending leftward from the drive gear 2, and a drive gear shaft 4 b extending rightward from the drive gear 2. And a bearing member 12 to be used. The bearing member 11 has a bearing 11a that is a bearing of the drive gear shaft 4a, and the bearing member 12 has a bearing 12a that is a bearing of the drive gear shaft 4b. Similarly, in FIG. 1, the casing 6 includes a bearing member 111 that supports a driven gear shaft 5 a that extends leftward from the driven gear 3, and a driven gear shaft that extends rightward from the driven gear 3. And a bearing member 112 that supports 5b. The bearing member 111 has a bearing 111a that is a bearing of the driven gear shaft 5a, and the bearing member 112 has a bearing 112a that is a bearing of the driven gear shaft 5b.

  Therefore, the bearing member 11 rotatably supports the drive gear shaft 4a by the drive gear shaft 4a being inserted through the bearing 11a, and the bearing member 12 is configured such that the drive gear shaft 4b is inserted through the bearing 12a. The drive gear shaft 4b is rotatably supported. Similarly, the bearing member 111 rotatably supports the driven gear shaft 5a by inserting the driven gear shaft 5a into the bearing 111a, and the bearing member 112 has the driven gear shaft 5b inserted through the bearing 112a. The driven gear shaft 5b is supported rotatably.

  Two side plates 20 and 21 are arranged on both sides of the drive gear 2 and the driven gear 3. The side plate 21 is an 8-shaped plate member in which two through holes 21a are formed. The side plate 21 is fitted into the internal space 10 and is disposed between the end surfaces of the drive gear 2 and the driven gear 3 and the bearing members 12 and 112. The side plate 21 is in contact with the end surfaces of the drive gear 2 and the driven gear 3 in a state where the drive gear shaft 4b and the driven gear shaft 5b are inserted through the two through holes 21a. The side plate 20 has the same configuration as the side plate 21. Accordingly, the two side plates 20 and 21 are disposed between the end surfaces of the drive gear 2 and the driven gear 3 and the bearing members 11 and 111 and the bearing members 12 and 112, respectively. Is in sliding contact. The area of the high-pressure part on the non-sliding surface side of the side plates 20 and 21 is slightly larger than the area of the high-pressure part on the sliding surface side, and the sliding surface is pressed against the side surfaces of the drive gear 2 and the driven gear 3, Is made as narrow as possible.

  A groove portion 11ba is formed on the surface of the bearing members 11 and 111 on the side plate 20 side, and an elastic gasket 11bb is provided inside the groove portion 11ba. The gasket 11bb divides a gap between the bearing members 11 and 111 and the side plate 20 into a low pressure space 10a and a high pressure space 10b. Similarly, a groove 12ba is formed on the surface of the bearing members 12, 112 on the side plate 21 side, and an elastic gasket 12bb is provided inside the groove 12ba. The gasket 12bb divides a gap between the bearing members 12, 112 and the side plate 21 into a low pressure space 10a and a high pressure space 10b.

  In the gear pump 1, a suction hole (not shown) that communicates with the low pressure space 10 a of the internal space 10 is formed on one side surface of the main body 7, and the high pressure of the internal space 10 is formed on the other side surface opposite to the suction hole. A discharge hole (not shown) leading to the space 10b is formed.

  Therefore, in the gear pump 1, piping from the tank that stores the working fluid is connected to the suction hole of the casing 6, and piping to the hydraulic equipment is connected to the discharge hole, so that the driving gear shaft of the driving gear 2 is connected. 4a is rotated by driving means (not shown). As a result, the driven gear 3 meshed with the drive gear 2 rotates, and the working fluid in the space surrounded by the inner peripheral surface of the internal space 10 and the tooth surfaces of the drive gear 2 and the driven gear 3 is discharged by the rotation of the gear. The discharge hole side becomes the high-pressure side and the suction hole side becomes the low-pressure side with the meshing portion of the drive gear 2 and the driven gear 3 as a boundary.

  When the working fluid is discharged to the discharge hole side and the suction hole side becomes negative pressure, the working fluid in the tank is sucked into the internal space 10 on the low pressure side through the pipe and the suction hole, and the inside of the internal space 10 The hydraulic fluid in the space surrounded by the peripheral surface and the tooth surfaces of the drive gear 2 and the driven gear 3 is transferred to the discharge hole side by the rotation of the gear, pressurized to a high pressure, and discharged through the discharge hole and piping. Sent to.

  Moreover, as shown in FIG. 3, the groove part 12ca is formed in the surface at the side plate 21 side of the bearing members 12 and 112. An elastic gasket 12cb is disposed inside the groove 12ca. The gasket 12cb partitions the two through holes 21a and the low pressure space 10a on the low pressure space 10a side from the gasket 12bb. The gasket 12cb is disposed along the outer periphery of the low pressure space 10a. The bearing members 11 and 111 have the same configuration as the bearing members 12 and 112.

  In the gear pump 1 of the present invention, the working fluid leaking from the side surface of the gear does not flow to the low pressure space 10a through the gap between the side plate 21 and the bearing members 12 and 112 by the gasket 12cb. Therefore, in the gear pump 1 of the present invention, as shown in FIG. 4 (cross section viewed from the line AA in FIG. 3), most of the working fluid leaking on the side surfaces of the gears is the bearing portion of the bearing members 12 and 112. , Passes through the passage 9a, and flows into the low-pressure space 10a (shown by a solid arrow). In FIG. 4, the oil flow around the drive gear shaft 4 b of the drive gear 2 has been described. However, the oil flow around the drive gear shaft 4 a of the drive gear 2 and around the driven gear shafts 5 a and 5 b of the driven gear 3. Is the same.

[Features of the gear pump of this embodiment]
The gear pump 1 of this embodiment has the following features.

  In the gear pump 1 of the present embodiment, oil leaking between the end faces of the drive gear 2 and the driven gear 3 and the side plates 20 and 21 passes between the side plates 20 and 21 and the bearing members 11, 111, 12 and 112. Passing through and flowing into the low-pressure space 10a can be prevented. Therefore, the oil leaked between the end faces of the drive gear 2 and the driven gear 3 and the side plates 20 and 21 passes through the bearing portions of the drive gear 2 and the driven gear 3 and flows into the low pressure space 10a, and the lubricity of the bearing portion. Will improve.

  In the gear pump 1 of the present embodiment, the gasket 12 cb can be easily disposed between the side plate 21 and the bearing member 12 by disposing the gasket 12 cb in the groove portion 12 ca of the bearing member 12.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  In the above-described embodiment, the case where the casing 6 includes the bearing members 11, 111, 12, and 112 has been described. However, as illustrated in FIG. 5, the bearing case 11 that is a separate bearing member from the casing 6. , 111, 12, 112 may be arranged in the casing 6.

  In the above-described embodiment, the case where the gasket disposed between the side plate and the bearing member is disposed inside the groove portion of the bearing member has been described, but the present invention is not limited thereto. Therefore, the gasket arrange | positioned between a side plate and a bearing member may be arrange | positioned inside the groove part of a side plate.

  Although the case where the present invention is applied to a gear pump has been described in the above-described embodiment, the present invention may be applied to a gear motor.

DESCRIPTION OF SYMBOLS 1 Gear pump 2 Drive gear 3 Driven gear 6 Casing 11, 12, 111, 112 Bearing member 12bb Gasket (1st gasket)
12ca groove 12cb gasket (second gasket)
20, 21 Side plate

Claims (2)

A driving gear and a driven gear that mesh with each other in the internal space of the casing, and abut against the inner peripheral surface of the internal space to partition the internal space into a high-pressure space and a low-pressure space;
A bearing member for supporting the shaft of the drive gear and the driven gear,
Wherein disposed between the drive gear and an end face of the driven gear and said bearing member, and a side plate having a shaft hole of the drive gear and the shaft of the driven gear passes,
Between the side plate and the bearing member,
A first gasket which partitions the said low pressure space and the high-pressure space,
Wherein the shaft hole and the and the second gasket that partitions the low pressure space is disposed in the low-pressure space side of the first gasket,
A gear pump or a gear motor characterized in that a passage is formed in the casing to communicate the gap between the casing and the end of the shaft and the low-pressure space . The bearing member is formed with a groove facing the side plate,
It said second gasket, gear pumps or gear motors according to claim 1, characterized in Tei Rukoto disposed within the groove.

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