阅读说明：本技术 齿轮泵或马达 (Gear pump or motor ) 是由 金谷顕一 于 2017-10-13 设计创作，主要内容包括：一种齿轮泵或马达,包括：壳体,在内部包括将成对的齿轮加以收纳的齿轮收纳室；侧板,介隔存在于壳体与齿轮之间；以及垫片,设置在所述侧板的与朝向齿轮的一侧的面即滑动面为相反侧的面即非滑动面,且将所述非滑动面与壳体之间的空间划分为高压侧与低压侧,并且为了能够在早期发现侧板是以表背颠倒、高压部侧与低压部侧颠倒的错误姿势来安装,所述齿轮泵或马达构成为：在所述侧板的姿势为规定姿势以外的情况下,与所述侧板的姿势为规定姿势的情况相比较,流量效率下降。(A gear pump or motor comprising: a housing including a gear housing chamber for housing a pair of gears therein; a side plate interposed between the housing and the gear; and a gasket provided on a non-sliding surface that is a surface of the side plate opposite to a sliding surface that is a surface facing the gear, the gasket dividing a space between the non-sliding surface and the housing into a high-pressure side and a low-pressure side, and the gear pump or the motor being configured to be mounted in an early stage in such a manner that the side plate is mounted in an erroneous posture that the front and back are reversed and the high-pressure side and the low-pressure side are reversed: when the posture of the side plate is other than the predetermined posture, the flow rate efficiency is decreased as compared with the case where the posture of the side plate is the predetermined posture.)

1. A gear pump or motor, comprising: a housing including a gear housing chamber for housing a pair of gears therein; a side plate interposed between the housing and the gear; and a spacer that is provided on a non-sliding surface that is a surface of the side plate opposite to a sliding surface that is a surface facing the gear, divides a space between the non-sliding surface and the housing into a high-pressure side and a low-pressure side, and divides the space between the non-sliding surface and the housing into a high-pressure side and a low-pressure side

The structure is as follows: when the posture of the side plate is other than a predetermined posture, the flow rate efficiency is reduced as compared with the case where the posture of the side plate is the predetermined posture,

the side portion of the side plate to be disposed on the high-pressure side is provided with an abutting portion that abuts the gear housing chamber, and the side portion is configured to abut the gear housing chamber only at the abutting portion, and the abutting portion is shorter than one pitch of the gear.

Technical Field

The present invention relates to a gear pump (gear pump) or a motor (motor) that feeds a working fluid by utilizing tooth grooves of a drive gear and a driven gear that mesh with each other to form a gear pair.

Background

Previously, as shown in fig. 1 and 6, there was a gear pump or motor which includes: a housing 1 having a gear housing chamber 11a for housing a pair of gears 2 and 3; a side plate 6 interposed between the housing 1 and the gears 2 and 3; and a spacer 8 that is provided on a non-sliding surface 6b that is a surface of the side plate 6 opposite to a sliding surface 6a that is a surface facing the gear 2 or the gear 3, and that divides a space between the non-sliding surface 6b and the housing 1 into a high-pressure side and a low-pressure side, wherein the sliding surface 6a of the side plate 6 is widely machined in order to suppress friction between the gear 2 or the gear 3 and the side plate 6 in the gear pump or the motor. When the side plate 6 is mounted upside down, the following problems may occur after the gear pump or the motor is delivered: breakage occurs due to the sliding property of the gears 2, 3 and the side plate 6 being lowered, or loud noise is caused by abnormal sound generated by the gear pump or the motor resonating with the vehicle body of the vehicle on which the gear pump or the motor is mounted; such defects are ignored in the inspection before delivery.

In the side plate 6 of the gear pump, a flat surface portion 6p is provided at a portion of the side plate 6 corresponding to the meshing portion of the pair of the gear 2 and the gear 3, and the flat surface portion 6p is provided near the low-pressure portion in order to suppress leakage of the working fluid from the high-pressure side to the low-pressure side, but to suppress generation of abnormal noise due to compression of the working fluid in a space formed by the side plate 6 and the teeth of the gear 2 and the gear 3 in the space. When the high-pressure side and the low-pressure side of the side plate 6 are mounted upside down, the gear pump or the motor is delivered, and the following disadvantages occur: the working fluid in the space formed by the side plate 6 and the teeth of the gears 2 and 3 is compressed in the space to generate an abnormal sound which resonates with the vehicle body of the vehicle on which the gear pump or the motor is mounted to cause a loud noise, etc., but such a defect is also ignored in the inspection before delivery.

[ Prior art documents ]

[ patent document ]

Patent document 1: japanese patent laid-open No. 2007-239621

Disclosure of Invention

[ problems to be solved by the invention ]

The present invention has been made in view of the above circumstances, and an object thereof is to enable mounting of a side panel in an early stage with an erroneous posture in which the front and back sides are reversed and the high pressure side and the low pressure side are reversed.

[ means for solving problems ]

In order to solve the above problems, the gear pump or the motor of the present invention has the following configuration. That is, the gear pump or the motor of the present invention includes: a housing including a gear housing chamber for housing a pair of gears therein; a side plate interposed between the housing and the gear; the gasket is arranged on a surface, facing to one side of the gear, of the side plate, namely a sliding surface, is a non-sliding surface opposite to the sliding surface, and divides a space between the non-sliding surface and the shell into a high-pressure side and a low-pressure side; and the gear pump or motor is configured to: when the posture of the side plate is other than the predetermined posture, the flow rate efficiency is reduced as compared with the case where the posture of the side plate is the predetermined posture, and an abutting portion that abuts against the gear housing chamber is provided at a side portion of the side plate to be disposed on the high pressure side, the side portion being configured to abut against the gear housing chamber only at the abutting portion, and the abutting portion being shorter than one pitch of the gear.

In the gear pump or the motor as described above, when the high-pressure portion side and the low-pressure portion side of the side plate are incorporated in an inverted manner, if the space between the teeth reaches the abutment portion, the space on the high-pressure side and the space on the low-pressure side with respect to the abutment portion communicate with each other, and the working fluid leaks from the high-pressure portion side to the low-pressure portion side, which leads to a decrease in flow rate efficiency.

[ Effect of the invention ]

According to the present invention, the reduction in the flow rate efficiency makes it possible to detect at an early stage that the side plate is mounted in an incorrect posture in which the front and back are reversed and the high pressure side and the low pressure side are reversed.

Drawings

Fig. 1 is a schematic diagram showing a gear pump according to a first embodiment of the present invention.

Fig. 2 is a sectional view taken along line a-a in fig. 1.

Fig. 3 is a cross-sectional view corresponding to fig. 2 in a state where the side plate of the first embodiment is mounted with the front and back thereof reversed.

Fig. 4 is a sectional view corresponding to fig. 2 showing a gear pump according to a second embodiment of the present invention.

Fig. 5 is a cross-sectional view corresponding to fig. 4 in a state where the high-pressure side and the low-pressure side of the side plate of the second embodiment are mounted upside down.

Fig. 6 is a sectional view corresponding to fig. 2 showing a conventional gear pump.

[ description of symbols ]

1: shell body

11 a: gear storage chamber

2. 3: gear wheel

2a, 3 a: side surface

4: drive shaft

5: driven shaft

6: side plate

6 a: sliding surface

6 b: non-slip surface

6 p: plane part (on sliding surface side)

6 q: plane part (on non-sliding surface side)

6 e: (of the low pressure side) edge

6 f: (of the high pressure side) edge

6f 1: abutting part

6x, 6 y: communicating hole

6 z: with bottom groove

7: bushing

8: gasket

11: main body

12: front cover

13: back cover

12x, 12y, 13x, 13 y: shaft hole

d1, d 2: width dimension

X: suction inlet

Y: discharge port

Detailed Description

Referring to fig. 1 to 3, a first embodiment of the present invention is shown below.

As shown in fig. 1, the gear pump of the present embodiment mainly includes: a housing 1 in which a main body 11, a front cover 12 and a rear cover 13 are joined, the main body 11 including a gear housing chamber 11a therein, the front cover 12 closing the gear housing chamber 11a of the main body 11 from the front, the rear cover 13 closing the gear housing chamber 11a of the main body 11 from the rear; a drive gear 2 and a driven gear 3 as external gear pairs, which are housed and held in a gear housing chamber 11a of the housing 1 and are engaged with each other; a drive shaft 4 and a driven shaft 5 that support the drive gear 2 and the driven gear 3, respectively; side plates 6 respectively fitted to the side surfaces of the driving gear 2 and the driven gear 3; bushings 7 as bearing portions disposed between the inner surfaces of the shaft hole 12x, the shaft hole 12y, the shaft hole 13x, and the shaft hole 13y of the housing 1 for housing the drive shaft 4 and the driven shaft 5, respectively, and the drive shaft 4 and the driven shaft 5; and a gasket 8 disposed between the side plate 6 and the case 1.

The housing 1, the drive gear 2, the driven gear 3, the drive shaft 4, the driven shaft 5, and the bushing 7 all have the same configurations as those of well-known components used in such a gear pump, and therefore, detailed descriptions thereof are omitted.

As shown in fig. 1, the side plates 6 are disposed at two portions to be fitted to the side surfaces 2a and 3a of the drive gear 2 and the driven gear 3, respectively, and seal the side surfaces 2a and 3a of the drive gear 2 and the driven gear 3, respectively. As shown in fig. 2 and 3, the outer peripheral edge of the side plate 6 has a shape corresponding to the inner surface of the gear housing chamber 11a, and the edges on the suction port X side, which is a low pressure side, and the discharge port Y side, which is a high pressure side. The sliding surface 6a of the side plate is machined to reduce friction generated between the side plate 6 and the drive gear 2 or the driven gear 3. In the present embodiment, the side plate 6 is configured such that a portion thereof corresponds to the meshing portion between the drive gear 2 and the driven gear 3. A total of two communication holes 6X and 6Y are provided at positions close to the suction port X and the discharge port Y, and the communication holes 6X and 6Y are provided to cross the side plate 6 and guide the working fluid to the side opposite to the gears 2 and 3. In order to prevent the working fluid from leaking from the high pressure side (the discharge port Y side) to the low pressure side (the suction port X), the portions between the communication holes 6X and 6Y are formed in a flat plate shape as flat surface portions 6p and 6q facing the meshing portions of the gear 2 and the gear 3.

However, in the present embodiment, the configuration is such that: the flat surface portion 6p on the sliding surface 6a side is larger than the flat surface portion 6q on the non-sliding surface 6b side. Specifically, as shown in fig. 2 and 3, a bottomed groove 6z, which opens on the non-sliding surface 6b side, is continuously provided at an end edge of the low-pressure-side communication hole 6X on the opposite side to the suction port X. That is, at the portion where the undercut 6z is provided, the surface on the sliding surface 6a side is continuous with the surface of the adjacent portion to form the flat surface portion 6p, whereas the surface on the non-sliding surface 6b side is the groove bottom of the undercut 6z and does not form the flat surface portion 6q, and therefore the width d1 of the flat surface portion 6p on the sliding surface 6a side is larger than the width d2 of the flat surface portion 6q on the non-sliding surface 6b side. In other words, the area of the flat surface portion 6p on the sliding surface 6a side is larger than that of the flat surface portion 6q on the non-sliding surface 6b side by only the area corresponding to the bottom surface of the bottomed groove 6 z.

When the side plate 6 configured as described above is incorporated such that the sliding surface 6a and the non-sliding surface 6b are inverted, the following phenomenon occurs.

That is, when the sliding surface 6a and the non-sliding surface 6b of the side plate 6 are inverted, the area of the flat surface portion 6q facing the portion corresponding to the meshing portion of the drive gear 2 and the driven gear 3 is smaller than the area of the flat surface portion 6p when the side plate 6 is incorporated in the correct direction. Therefore, when the gear pump is operated, the amount of the working fluid leaking from the discharge port Y to the suction port X increases, and the flow rate efficiency decreases.

That is, according to the present embodiment, with the above-described configuration, it is possible to urge the side plate 6 to be mounted with the front and back thereof reversed by the reduction in the flow rate efficiency at the time of the trial operation. Therefore, the following problems can be prevented from occurring: in the gear pump, the side plate 6 is mounted upside down, and the gear pump is shipped, and after the shipment, the gear pump is damaged along with the reduction of the sliding property of the gear 2, the gear 3 and the side plate 6; or, the abnormal sound generated by the gear pump may resonate with a vehicle body of a vehicle on which the gear pump is mounted, thereby causing a loud noise.

Next, referring to fig. 4 and 5, a second embodiment of the present invention is shown below.

The gear pump of the present embodiment has the same configuration as that of the gear pump of the first embodiment except for the shape of the side plate as described below. The parts corresponding to the gear pump of the first embodiment are given the same names and symbols, and detailed description thereof is omitted.

The side plates of the gear pump of the present embodiment are disposed at two positions to be fitted to the both side surfaces 2a and 3a of the drive gear 2 and the driven gear 3, and seal the side surfaces 2a and 3a of the drive gear 2 and the driven gear 3, respectively. As shown in fig. 4, an end edge 6e of the outer peripheral edge of the side plate 6 on the low-pressure side, i.e., on the side of the suction port X, has a shape corresponding to the inner surface of the gear housing chamber 11 a. On the other hand, the edge 6f on the ejection port Y side, which is the high pressure side, has the following shape. A contact portion 6f1 that contacts the gear housing chamber 11a is provided at a portion of the end edge 6f on the ejection port Y side. This edge 6f is constituted by: only the contact portion 6f1 faces the inner surface of the gear housing chamber 11a with a slight gap therebetween, and is largely separated from the inner surface of the gear housing chamber 11a at other portions. The length of the contact portion 6f1 in the circumferential direction is set to be shorter than one pitch of the gears 2 and 3.

When the side plate 6 is correctly attached, as shown in fig. 4, the side plate 6 is pressed against the suction port X by the force from the hydraulic fluid pressure, and the end edge 6e on the suction port X side strikes the inner surface of the gear housing chamber 11a in a planar manner, thereby suppressing the hydraulic fluid from passing over the side plate 6 and leaking to the suction port X side.

On the other hand, when the side plate 6 configured as described above is operated in a state where the high-pressure side and the low-pressure side are mounted upside down, the following phenomenon occurs. That is, when the side plate 6 is pressed toward the suction port X by the force from the hydraulic fluid pressure, as shown in fig. 5, the end edge 6f located on the suction port X side hits the inner surface of the gear housing chamber 11a only at the contact portion 6f 1. On the other hand, as described above, the abutment portion 6f1 is shorter than one pitch of the gear. Therefore, when the spaces between the teeth of the gears 2 and 3 reach the position facing the contact portion 6f1, the space filled with the working fluid on the high-pressure side communicates with the low-pressure side (the suction port X side) via the spaces between the teeth. This reduces the flow rate efficiency during operation of the gear pump.

That is, according to the present embodiment, with the above-described configuration, it is possible to urge the side plate 6 to be mounted with the high-pressure side and the low-pressure side reversed by the reduction in the flow rate efficiency at the time of the test operation. Therefore, the following disadvantages can be prevented: such a gear pump is shipped in a state where the high-pressure side and the low-pressure side of the side plate 6 are mounted upside down, and after shipment, the abnormal sound generated by the gear pump resonates with a vehicle body of a vehicle on which the gear pump or the motor is mounted, and generates a large noise.

The present invention is not limited to the above-described embodiments.

For example, the features of the first and second embodiments may be applied to the same side panel at the same time. That is, the following form may be adopted: a bottomed groove is provided in a non-sliding surface opening of the side plate, and a contact portion that comes into contact with the gear housing chamber is provided in a part of an end edge on the high-pressure side, and the length of the contact portion in the circumferential direction is set to be shorter than one pitch of the gear.

The structure for promoting the finding of the mounting of the side plates with the front and back sides reversed due to the reduction in the flow rate efficiency is not limited to the structure of the first embodiment. However, according to the configuration of the first embodiment, as described above, the area of the flat surface portion facing the portion corresponding to the meshing portion of the drive gear and the driven gear is made smaller than the area of the flat surface portion in the case where the side plate is incorporated in the correct direction, whereby the difference in flow rate efficiency due to the orientation of the side plate can be effectively generated with a simple configuration.

On the other hand, the structure for promoting the finding of the upside-down mounting of the high-pressure side and the low-pressure side of the side plate by the reduction of the flow rate efficiency is not limited to the structure of the second embodiment. However, according to the configuration of the second embodiment, if the high-pressure side and the low-pressure side of the side plate are mounted upside down as described above, the length of the abutting portion to be arranged at the end edge of the high-pressure side is made shorter than one pitch of the gear, and thus, if the end edge and the abutting portion are arranged at the low-pressure side, the flow rate efficiency is greatly reduced, and therefore, a difference in flow rate efficiency due to the orientation of the side plate can be effectively generated with a simple configuration.

In addition, various modifications can be made within a range not to impair the gist of the present invention.