JPH04134670U - Radial plunger pump device - Google Patents

Abstract

(57) [Summary] [Purpose] The hydraulic fluid supplied from the liquid tank is filtered in the liquid storage chamber of the casing to prevent foreign matter from entering the suction port, and the filter is used to filter the pump housing. Absorbs and suppresses vibrations. [Configuration] A filter 36 for filtering the liquid sucked into the suction port 24 is installed in the liquid reservoir chamber 26 in the casing 2 where the suction port 24 opens, and a synthetic resin filter body 37 of the filter 36 has a casing 2 and a synthetic resin liner 38 that fits between the opposing peripheral surfaces of the pump rotor 17.
are installed in succession.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention can be used as a hydraulic pressure source for various hydraulically operated devices such as automobile anti-lock brakes. Regarding radial plunger pump devices that are Fit the pump housing of the radial plunger type hydraulic pump into the housing recess. Attach the electric motor bearing bracket to the casing so as to close the opening, and , the output shaft of this electric motor is connected to the pump rotor of the hydraulic pump, and the output shaft of the electric motor is connected to the pump rotor of the hydraulic pump. The inlet of the suction port of the hydraulic pump is opened between the housing and the bearing bracket. A liquid storage chamber is defined for the liquid tank, and the liquid from the liquid tank is introduced into this liquid storage chamber. Concerning improvements.

0002

[Conventional technology]

Such a pump device is disclosed, for example, in Japanese Patent Laid-Open No. 104167/1983. It is already known that

0003

[Problem that the idea aims to solve]

Conventionally, the liquid reservoir chamber of such pump devices is not equipped with a filter, and the liquid tank is Only the working fluid that has been filtered within the tank is supplied.

0004 Therefore, in the unlikely event that a foreign object is present in the liquid supply pipe connecting the liquid tank and the liquid storage chamber of the pump device, If present, the foreign material may enter the suction port of the pumping device with the hydraulic fluid. There is a risk that

[0005] This invention was developed in view of the above circumstances, and it is necessary to remove foreign substances inside the liquid supply pipe. The hydraulic fluid can be filtered by a filter in the liquid storage chamber, and this filter This makes it possible to absorb and suppress vibrations in the pump housing, resulting in high durability. It is an object of the present invention to provide a hydraulic pump device which is easy to use, and has less vibration and noise. .

[0006]

[Means to solve the problem]

In order to achieve the above object, the present invention provides the pump housing and the bearing block. between the opposing surfaces of the racket, with both ends in contact with these opposing surfaces, and the inlet of the suction port. An annular synthetic resin filter body that surrounds the filter body and a window hole in the peripheral wall of this filter body. A filter is interposed between the filter body and the casing. The synthetic resin liner fitted between the opposing peripheral surfaces of the pump housing and the pump housing are connected together. It is characterized by having been established.

[0007]

【Example】

Embodiments of the present invention will be described below with reference to the drawings.

[0008] First, a first embodiment shown in FIGS. 1 to 7 will be explained.

[0009] In FIG. 1, a casing 2 housing a radial plunger type hydraulic pump 1 is shown. On the right side, there is an electric motor 3 that drives the hydraulic pump 1 and the electric motor 3 that drives the hydraulic pump 1. An accumulator 4 is attached to the left side of the casing 2 to store the hydraulic pressure. is an anti-lock brake (not shown) using the hydraulic pressure of accumulator 4 as the control hydraulic pressure. A hydraulic conduit 5 supplying the device is connected. The upper surface of the casing 2 also has an inlet pipe. 6 is removably attached, and this inlet pipe 6 is connected to the liquid tank T via a liquid supply pipe L. and then connected.

0010 In FIGS. 2 to 4, the casing 2 has a large-diameter accommodation recess opened on its right end surface. 2a and a small-diameter accommodation recess 2b opened at the bottom of the recess 2a. A radial plunger type hydraulic pump 1 is housed in the parts 2a and 2b. and large diameter yield A bearing bracket for the electric motor 3 is installed in the casing 2 so as to close the opening of the recess 2a. The nut 7 is fitted with an inro through an O-ring 8 and is fixed with a bolt 9. .

[0011] The pump housing 10 of the hydraulic pump 1 has a circular shape that fits into the large diameter accommodation recess 2a. The cylindrical portion 10a and the small diameter accommodation recess 2 are connected to one end of the cylindrical portion 10a via the intermediate wall 10c. It has a support shaft portion 10b that is loosely engaged with the shaft portion 10b. The inner circumferential surface of this cylindrical portion 10a is The cam surface is eccentric by a certain amount ε downward with respect to the fixed shaft 12 press-fitted into the center of 0b. 11, and a radial roller bearing 13 is connected to this cam surface 11. The eccentric wheel 14 is rotatably supported. Therefore, this eccentric wheel 14 also has a cam surface 11 Similarly, it is eccentric by a certain amount ε with respect to the fixed shaft 12.

0012 A position embedded in the intermediate wall 10c to prevent the pump housing 10 from rotating. The setting pin 15 is fitted into the positioning hole 16 of the casing 2.

[0013] The fixed shaft 12 protrudes into the cylindrical portion 10a of the pump housing 10, and its protrusion The pump rotor 17 is rotatably supported by the input portion. This pump rotor 17 It has a plurality of (two in the illustrated example) cylinder holes 18, 18 arranged radially. These cylinder holes 18, 18 have a double cylinder whose outer end is brought into contact with the inner circumferential surface of the eccentric ring 14. Several plungers 19, 19 are slidably fitted.

[0014] The pump rotor 17 also has a connecting recess 20 on its right end surface. The tip of the output shaft 22 of the electric motor 3 is attached to the center of the joint member 21 that engages with the A square shaft portion 22a formed at the end is fitted. Therefore, the output shaft 22 The pump rotor 17 can be rotationally driven via the gate member 21.

[0015] As clearly shown in FIG. 4, each plunger 19 is When rotating, it can reciprocate with a stroke twice the eccentricity ε of the eccentric wheel 14. In this case, the radially outward movement stroke is the suction stroke S, and the radially inward movement stroke is the suction stroke S. The moving stroke is the discharge stroke D.

[0016] Each plunger 19 has a point between it and the outer peripheral surface of the fixed shaft 12 in each cylinder hole 18. A pump chamber 23 is defined, and this pump chamber 23 is used for the suction and discharge strokes S of the plunger 19. , D, the pressure is reduced and increased.

[0017] 2 to 6, the fixed shaft 12 includes a suction port 24 and a discharge port 2. 5 is provided, and the inlet 24a of the suction port 24 is connected from the right end surface of the fixed shaft 12. Opening toward the liquid reservoir chamber 26 defined in the large-diameter accommodation recess 2a by the bearing bracket 7 However, the outlet 24b is connected to the pump chamber 23 facing the suction stroke S from the outer peripheral surface of the fixed shaft 12. It opens in the shape of a notch. On the other hand, the inlet 25a of the discharge port 25 is connected to the fixed shaft 12. It opens in a notch shape from the outer circumferential surface toward the pump chamber 23 facing the discharge stroke D, and has an outlet. 25b indicates the through hole 27 of the support shaft portion 10a, the annular passage 28 of the casing 2, and the through hole 2. It communicates with the accumulator 4 and the hydraulic conduit 5 via 9. This discharge port 2 5 includes a check to prevent the pressure liquid from flowing backward from the outlet 25b side to the inlet 25a side. A valve 30 is interposed.

[0018] Hydraulic pressure is applied from the annular passage 28 through the loose part of the casing 2 and the support shaft 10a. In order to prevent leakage, there are a pair of left and right holes lined up with an annular passage 28 between them. An O-ring 32, which is an elastic member, is installed in a compressed state. Also, in case the left O-ring If the O-ring 32 is damaged, the fluid pressure leaking from the O-ring 32 will In order to prevent this from acting on the A communication hole 35 that provides constant communication between the small liquid chamber 34 and the liquid storage chamber 26 on the opposite side. is provided in the pump housing 10. Therefore, the liquid pressure leaked to the small liquid chamber 34 is released to the low-pressure liquid storage chamber 26 through the communication hole 35, and leaks to the small liquid chamber 34. It is possible to avoid applying a thrust load to the pump housing 10 due to the hydraulic pressure.

[0019] In FIGS. 2 and 7, a filter 36 is installed in the liquid storage chamber 26. This fi The rotor 36 is an annular synthetic resin filter that surrounds the right end of the pump rotor 17. A filter body 37 and a filter stretched through a large number of window holes 40, 40, . It consists of nets 41, 41... The filter body 37 is connected to the pump housing 10 and the flanges 37a and 37b that abut the opposing surfaces of the bearing bracket 7, respectively, on the left side. Both flanges 37a, 37b are provided with a large number of ribs 37c, 3. 7c... are interconnected. Also, at the outer peripheral end of the left flange 37a, A cylindrical synthetic tree that fits tightly between the opposing peripheral surfaces of the pump housing 10 and the casing 2 A fat liner 38 is integrally provided. That is, the filter body 37 and liner 38 are It is integrally molded from synthetic resin.

[0020] Referring again to FIG. 2, the inlet pipe 6 projects into the upper part of the liquid storage chamber 26. and This inlet pipe 6 is in contact with the left flange 37a, and the filter 36 and pump The housing 10 is temporarily fixed to the casing 2. Therefore, the bearing bracket 7 Even when separated from the casing 2, the filter 36 and pump housing 10 cannot be removed. It can prevent falling. Filter 36 and pump for maintenance etc. When removing the housing 10, first pull out the inlet pipe 6 from the casing 2. Ku.

[0021] Next, the operation of this embodiment will be explained.

[0022] The electric motor 3 is operated, and its output shaft 22 causes the electric motor to move through the joint member 21. When the pump rotor 17 is rotated around the fixed shaft 12, the plunger 19 inside it , 19... are urged radially outward by centrifugal force and come into contact with the inner peripheral surface of the eccentric wheel 14. It rotates together with the pump rotor 17. At this time, the eccentric wheel 14 is connected to the plunger 19, It rotates along the roller bearing 13 while being dragged by the pump roller 19. Since the rotation centers of the rotor 17 and the eccentric ring 14 are eccentric from each other by ε, each plunger The roller 19 has a stroke twice the eccentricity ε every time the pump rotor 17 makes one revolution. The pump chamber 23 is depressurized and pressurized by reciprocating the cylinder hole 18.

[0023] Therefore, when the pressure in the pump chamber 23 is reduced by the suction stroke S of the plunger 19, the liquid reservoir is The working fluid in the chamber 26 is sucked into the pump chamber 23 through the suction port 24 of the fixed shaft 12. It will be done. Furthermore, when the plunger 19 pressurizes the pump chamber 23 during the discharge stroke D, the plunger 19 The hydraulic fluid pressurized in the pump chamber 23 is discharged to the discharge port 25 of the fixed shaft 12, and The water is guided to the accumulator 4 through the through hole 27 and the like by opening the lock valve 30.

[0024] During this time, the liquid is introduced from the liquid tank T to the liquid storage chamber 26 through the liquid supply pipe L and the inlet pipe 6. The working fluid is filtered by the filter net 41 of the filter 36 and then flows into the suction port 24. do. Therefore, even if there is a foreign substance in the liquid supply pipe L etc. upstream of the liquid storage chamber 26, it can be removed. It can be removed to prevent entry into the suction port 24. Also, filter like this A portion of the drained hydraulic fluid is also supplied to the roller bearing 13 and used for lubrication thereof. Ru.

[0025] Therefore, vibrations caused by the rotation of the pump rotor 17 are transmitted to the pump housing 10. If so, the vibration is caused by elastic deformation of the synthetic resin liner 38 on the cylindrical portion 10a side. , and is absorbed and suppressed by the elastic deformation of the O-rings 32, 32 on the support shaft portion 10b side. Therefore, vibration transmission to the casing 2 can be suppressed as much as possible. Moreover, the above la The inner 38 is integrally molded with the filter body 37 made of synthetic resin. There is no increase in the number of parts due to this.

[0026] 8 and 9 show a second embodiment of the present invention, in which the liner 38 is arranged on each independent axis. It is composed of a plurality of liner pieces 38a, 38a... in the direction, and each liner piece 38 A locking pawl 38c that engages with the outer surface of the intermediate wall 10c of the pump housing 10 is provided at the tip of a. The configuration is the same as that of the previous embodiment except that .

[0027] According to this embodiment, the pump housing of the liner 38 is caused by the deflection of each liner piece 38a. The liner 38 can be easily fitted into the locking claw 38b of each liner 38. The filter 36 can be easily connected to the pump housing 10 by engaging the partition wall 10c. can be done. In this way, the pump housing 10 and filter 26 assembly is connected. These can be easily attached to the casing 2.

[0028] FIG. 10 shows a third embodiment of the present invention, in which the locking pawl 38b of each liner piece 38a is is engaged with the annular groove 43 formed on the outer periphery of the cylindrical portion 10a of the pump housing 10. The structure is the same as that of the second embodiment except for the above points. According to this embodiment, the liner Even if the piece 38a is formed relatively short, the pump housing 10 and the and filter 38 can be constructed.

[0029]

[Effect of the idea]

As described above, according to the present invention, the pump housing and the bearing bracket a ring surrounding the inlet of the suction port with both ends in contact with these opposing surfaces; A synthetic resin filter body with a shape, and a filter installed in a window hole in the peripheral wall of the filter body. A filter consisting of a net is interposed, and the filter body is provided with the casing and the port. Synthetic resin liners that fit between the opposing circumferential surfaces of the pump housing are integrally connected. The hydraulic fluid is filtered in the liquid reservoir chamber of the casing to remove foreign substances present in the liquid supply pipe, etc. can be removed. Moreover, the above filter is attached to the casing and pump housing. It has an integral synthetic resin liner that fits between the two, and due to the elastic deformation of this liner, Absorbs and suppresses vibrations in the pump housing to prevent vibrations from being transmitted to the casing as much as possible. Therefore, durability with less vibration and noise is achieved without increasing the number of parts. It is possible to provide a radial plunger pump device with high performance.

[Brief explanation of drawings]

FIG. 1 is a side view of a radial plunger pump device according to a first embodiment of the present invention.

[Fig. 2] Enlarged longitudinal sectional side view of the hydraulic pump section in the pump device (cross-sectional view taken along the line 2-2 in Fig. 4)

[Figure 3] Cross-sectional view taken along line 3-3 in Figure 4

[Figure 4] Cross-sectional view taken along line 4-4 in Figure 2

[Figure 5] Right side view of the fixed shaft in Figure 4

[Figure 6] Left side view of the fixed shaft

[Figure 7] Perspective view of the filter in Figure 2

FIG. 8 is a sectional view similar to FIG. 2 showing a second embodiment of the present invention;

[Fig. 9] Perspective view of the filter in Fig. 8

FIG. 10 is a sectional view similar to FIG. 2 showing a third embodiment of the present invention;

[Explanation of symbols]

1 Hydraulic pump 2 Casing 2a, 2b accommodation recess 3 Electric motor 10 Pump housing 12 Fixed axis 14 Eccentric wheel 17 Pump rotor 19 Plunger 21 Joint member 22 Output shaft 23 Pump room 24 Suction port 25 Discharge port 26 Liquid storage chamber 36 Filter 37 Filter body 38 Raina 40 window hole 41 Filter net 43 Annular groove L Liquid supply pipe T Liquid tank

Claims (1)

[Scope of utility model registration request] [Claim 1] Housing recesses (2a, 2) of casing (2)
b), fit the pump housing (10) of the radial plunger type hydraulic pump (1) into the housing recesses (2a, 2).
The bearing bracket (7) of the electric motor (3) is joined to the casing (2) so as to close the opening of the electric motor (3), and the output shaft (22) of the electric motor (3) is connected to the hydraulic pump (1). The inlet (24) of the suction port (24) of the hydraulic pump (1) is connected to the pump rotor (17) of the hydraulic pump (1), between the pump housing (10) and the bearing bracket (7).
In the radial plunger pump device, the pump housing (10) and An annular synthetic resin filter body (37) that surrounds the inlet (24a) of the suction port (24) with both ends abutting these opposing surfaces between the opposing surfaces of the bearing bracket (7); and this filter body. A filter (36) consisting of a filter net (41) stretched over a window hole (40) in the peripheral wall of (37) is interposed, and the filter body (37) is
7) A radial plunger pump device, characterized in that a synthetic resin liner (38) fitted between opposing peripheral surfaces of the casing (2) and the pump housing (10) is integrally provided.