JPH04132462U - hydraulic pump device - Google Patents

Abstract

(57) [Summary] [Purpose] To press and hold the pump housing against the bottom surface in the axial direction within the casing without play, thereby suppressing its vibration. [Configuration] An annular pressure chamber 29 that communicates with the outlet hole 28 through which the pressure fluid passes is formed between the opposing peripheral surfaces of the casing 2 and the pump housing 10 by first and second seal members 31 and 32 arranged on both sides thereof. The first seal member 31 is installed in the annular groove 33 on the inner peripheral surface of the casing 2, and the second seal member 32 is installed in the annular groove 34 on the outer peripheral surface of the pump housing 10. The pressure acting on the pump housing 32 presses and holds the pump housing 10 at a position where it contacts the bottom surface of the casing 2.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention can be used as a hydraulic pressure source for various hydraulic devices such as anti-lock brakes in automobiles. Regarding hydraulic pump devices, especially the pump housing is placed in the housing recess of the casing. This is fitted so that it abuts the bottom of the recess, and the pump is inserted into this pump housing. The hydraulic pressure generated by the rotation of the rotor is transferred from the pump housing to the casing. This invention relates to an improvement in which the liquid can be taken out through an outlet hole provided over the entire length.

0002

[Conventional technology]

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

0003

[Problem that the idea aims to solve]

Conventionally, in such hydraulic pump devices, the axial movement of the pump housing is restricted. For bundling, the casing and pump housing are fitted with radially extending fasteners. A fixed pin is fitted, but the fixed pin and the casing and pump housing are Because there is an unavoidable gap between the pin hole and the pin hole, the pump may Uzing may cause vibration within the casing.

0004 This invention was made in view of the above circumstances, and the pump housing is located inside the casing. The above-mentioned liquid is capable of pressing and holding the ring in the axial direction without play and preventing its vibration. The purpose is to provide a pressure pump device.

[0005]

[Means to solve the problem]

In order to achieve the above object, the present invention provides the casing and the pump housing. A pressure chamber communicating with the outlet hole is formed between the opposing surfaces of the The pressure is applied so that the pump housing is biased in the direction of contact with the bottom surface of the housing recess. The first feature is that a pressure receiving part facing the chamber is provided in the pump housing.

[0006] In addition to the above-mentioned features, the present invention also provides for While the first seal member is installed in the annular groove on the inner circumferential surface of the accommodation recess, the first seal A second sealing member that is spaced apart from the member in the axial direction and in close contact with the inner circumferential surface of the accommodation recess is inserted into the port. It is installed in the annular groove on the outer circumferential surface of the pump housing, and the front A second feature is that the pressure chamber is defined and the second seal member is used as the pressure receiving part. Ru.

[0007]

【Example】

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

[0008] First, in FIG. 1, a case housing a radial plunger type hydraulic pump 1 is shown. An electric motor 3 for driving the hydraulic pump 1 and an electric motor 3 for driving the hydraulic pump 1 are mounted on the right side of the housing 2. An accumulator 4 is installed to store the hydraulic pressure generated in the casing 1. On the left side of 2, there is an anti-lock (not shown) that uses the hydraulic pressure of accumulator 4 as control hydraulic pressure. A hydraulic conduit 5 supplying the brake system is connected. Also, the top surface of the casing 2 An inlet pipe 6 for introducing a liquid tank (not shown) into the hydraulic pump 1 is attached to the It will be done.

[0009] In FIGS. 2 to 4, the casing 2 has a large-diameter accommodation recess opened on its right end surface. A storage recess consisting of a small-diameter storage recess 2b opened at the bottom of the recess 2a. The radial plunger type hydraulic pump 1 is accommodated in these recesses 2a and 2b. Ru. Then, the electric motor is installed in the casing 2 so as to close the opening of the large-diameter accommodation recess 2a. The bearing bracket 7 of the motor 3 is inro-fitted via the O-ring 8, and the bolt 9 It is fixed by

0010 The pump housing 10 of the hydraulic pump 1 is fitted into the large diameter accommodation recess 2a. A cylindrical portion 10a, and the above-mentioned cylindrical portion connected to one end of the cylindrical portion 10a via a partition wall 10c. It has a support shaft part 10b that is fitted into the small diameter accommodation recess 2b, and the support shaft part 10b is usually a small diameter accommodation recess 2b. The end surface is brought into contact with the bottom surface of the diameter accommodation recess 2b. This cylindrical part 10a The inner circumferential surface of A radial roller is formed on the cam surface 11 which is eccentric by the amount ε. An eccentric wheel 14 is rotatably supported via a bearing 13. Therefore, this bias Like the cam surface 11, the core ring 14 is also eccentric by a certain amount ε with respect to the fixed shaft 12. Become.

[0011] A shaft installed in the partition wall 10c to prevent the pump housing 10 from rotating. The positioning pin 15 in the direction is removably inserted into the positioning hole 16 of the casing 2. It will be done.

0012 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.

[0013] 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.

[0014] 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.

[0015] 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.

[0016] 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. An inlet connected to the inlet pipe 6 is provided on the upper surface of the liquid reservoir chamber 26. Hole 27 opens.

[0017] On the other hand, the inlet 25a of the discharge port 25 is connected to the discharge stroke D from the outer peripheral surface of the fixed shaft 12. The outlet 25b is opened in the shape of a notch toward the pump chamber 23 facing the pump housing. The outlet hole 28 extends from the support shaft 10b of the gear 10 to the casing 2. It communicates with the accumulator 4 and the hydraulic conduit 5. The discharge port 25 has its outlet 25 A check valve 30 is interposed to prevent backflow of pressure fluid from b to the inlet 25a side.

[0018] An outlet hole 28 is provided between the outer circumferential surface of the support shaft portion 10b and the inner circumferential surface of the small diameter accommodation recess 2b. first and second sealing members 3 having an annular pressure chamber 29 disposed on both sides thereof communicating with the first and second sealing members 3; 1,32. At that time, the first seat located on the base side of the support shaft portion 10b The ring member 31 is attached to the annular groove 33 on the inner circumferential surface of the small diameter accommodation recess 2b and in close contact with the outer circumferential surface of the In addition, a second seal member located on the tip side of the support shaft portion 10b 32 is attached to the annular groove 34 on the outer peripheral surface of the support shaft portion 10b and is inserted into the inner periphery of the small diameter accommodation recess 2b. Close to the surface. This second seal member 33 constitutes the pressure receiving part of the present invention.

[0019] A small liquid chamber 35 is defined between the tip of the support shaft portion 10b and the bottom surface of the small diameter accommodation recess 2b. A communication hole 36 that communicates this small liquid chamber 35 with the liquid reservoir chamber 26 is provided in the support shaft portion 10b. drilled.

[0020] In addition, the pump housing 10 is provided with air bubbles accumulated inside the pump housing 10 at the entrance of the liquid reservoir chamber 26. A defoaming hole 37 and a guide groove 38 are provided for discharging air to the opening of the hole 27.

[0021] A shallow recess 39 is formed in the end surface of the cylindrical portion 10a of the pump housing 10. A retaining plate 40 facing the outer shoulder 17a of the pump rotor 17 is fitted into this recess 39. and fixed by caulking several places 39a on the circumferential wall of the recess 39. . Thus, the holding plate 40 has a slot on the fixed shaft 12 that comes into contact with the inner end surface of the support shaft portion 10b. The pump rotor 17 cooperates with the top plate 41 to restrict movement of the pump rotor 17 in the axial direction.

[0022] The retainer plate 40 includes a retainer protruding from one side toward the bearing bracket 7. A ring 42 is integrally connected, and a large number of through holes 43, 43 are bored in the peripheral wall of the ring 42. ing.

[0023] 2 and 7, the retaining ring 42 includes a ring that surrounds the right end of the pump rotor 17. A filter 44 is fitted therein. This filter 44 has a large number of window holes 45, 45... a body portion 46a having a body portion 46a; A pair of flanges 46b, 46 that are in close contact with the holding plate 40 and the bearing bracket 7, respectively. It has a filter body 46 made of synthetic resin consisting of 7 is stretched.

[0024] The inside part of the filter 44 is attached to the inner peripheral edge of the holding plate 40, and the inner part of the filter 44 is attached to the pump housing 10. A notch 48 communicating therein is provided.

[0025] Next, the operation of this embodiment will be explained.

[0026] 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. Rotates together with the pump rotor 17. At this time, the eccentric wheel 14 is connected to the plunger 19,1. The pump rotor rotates along the roller bearing 13 while being dragged by the pump rotor 9. Since the rotation centers of 17 and eccentric wheel 14 are eccentric from each other by ε, each plunger 19 has a stroke twice the eccentricity ε every time the pump rotor 17 rotates once. The pump chamber 23 is depressurized and pressurized by reciprocating the cylinder hole 18.

[0027] Therefore, when the pressure in the pump chamber 23 is reduced by the suction stroke S of the plunger 19, the The liquid is introduced from the liquid tank into the liquid storage chamber 26 through the inlet pipe 6 and the inlet hole 47. Dynamic fluid is sucked into the pump chamber 23 through the suction port 24 of the fixed shaft 12. Also When the pump chamber 23 is pressurized by the discharge stroke D of the plunger 19, the pump chamber 23 The pressurized hydraulic fluid is discharged to the discharge port 25 of the fixed shaft 12, and the check valve 30 is opened and led to the accumulator 4 through the outlet hole 28.

[0028] During this time, the working fluid introduced into the liquid reservoir chamber 26 is filtered by the filter net 47 of the filter 44. After that, it flows into the suction port 24. Also, part of the working fluid filtered in this way The water is supplied to the roller bearing 13 through the notch 48 of the retaining plate 40, and the moisture is supplied to the roller bearing 13. Served smoothly.

[0029] In addition, while the pressure liquid discharged from the discharge port 25 passes through the outlet hole 28, the 10b and the annular pressure chamber 29 between the casing 2, but the first and second seal parts The members 31 and 32 prevent pressure fluid from leaking from the pressure chamber 29.

[0030] Moreover, the first seal member 31 is inserted into the annular groove 33 of the casing 2, and the second seal member 31 is Since the members 32 are respectively attached to the annular grooves 34 of the support shaft portion 10b, the pressure chamber 2 The axial component of the pressure acting on the second seal member 32 from 9 causes the second seal member 32 to The signal is transmitted to the support shaft portion 10b through the support shaft portion 10b, and is directed toward the bottom surface of the small diameter accommodation recess 2b of the casing 2. That's biased. Thus, the pump housing 10 has its support shaft portion 10b as described above. It is pressed and held in contact with the bottom surface of the small-diameter accommodation recess 2b, and the rotation of the pump rotor 17 is No vibration occurs even during rolling.

[0031] In the unlikely event that the second seal member 32 is damaged, the support shaft 10b and the small diameter Even if pressure fluid leaks into the small liquid chamber 35 between the bottom surface of the container recess 2b, the pressure fluid is immediately communicated. The small liquid chamber 35 is still a liquid reservoir because it is released through the hole 36 to the low pressure liquid reservoir chamber 26. The pressure is maintained at the same pressure as 26. Therefore, the pressure chamber 29 acts on the second seal member 32. The pressure presses the pump housing 10 into contact with the bottom surface of the small-diameter accommodation recess 2b. can continue to hold it.

[0032] Note that the tip of the support shaft portion 10b of the pump housing 10 should be in contact with the bottom surface of the small diameter accommodation recess 2b. Instead of bringing the partition wall 10c of the pump housing 10 into contact with the bottom surface of the large-diameter accommodation recess 2a, The same effect as described above can be obtained even if it is brought into contact with.

[0033]

[Effect of the idea]

As described above, according to the first feature of the present invention, the casing and the pump housing A pressure chamber communicating with the outlet hole is formed between the opposing surfaces of the ring, and the pressure of this pressure chamber is used to and is biased in the direction of contact between the pump housing and the bottom surface of the housing recess. Since the pressure receiving part facing the pressure chamber is installed in the pump housing, the liquid pressure taken out from the outlet hole is This can be used to press and hold the pump housing in contact with the bottom of the casing. Therefore, it is possible to prevent vibration of the pump housing with a simple structure. Wear.

[0034] Further, according to a second feature of the present invention, the While the first seal member is installed in the annular groove on the inner circumferential surface of the accommodation recess, the first seal A second sealing member that is spaced apart from the member in the axial direction and in close contact with the inner circumferential surface of the accommodation recess is inserted into the port. It is installed in the annular groove on the outer circumferential surface of the pump housing, and the front Since the pressure chamber is defined and the second seal member is used as the pressure receiving part, the first and second seal members are The seal member can prevent leakage of pressure fluid from the pressure chamber, and also Since the two seal members also serve as the pressure receiving section, it can contribute to further simplification of the structure.

[Brief explanation of drawings]

[Fig. 1] Side view of a hydraulic pump device according to an embodiment of the present invention.

[Fig. 2] Enlarged vertical sectional side view of the hydraulic pump section in Fig. 1 (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] Cross-sectional view taken along line 7-7 in Figure 2

[Explanation of symbols]

2 Casing 10 Pump housing 17 Pump rotor 28 Exit hole 29 Pressure chamber 31 First seal member 32 Second seal member (pressure receiving part) 33,34 Annular groove

Claims (2)

[Scope of utility model registration request] [Claim 1] Housing recesses (2a, 2) of casing (2)
b), fit the pump housing (10) into the recess so that it abuts the bottom surface of the recess;
0), in which the hydraulic pressure generated by the rotation of the pump rotor (17) in the pump rotor (17) is taken out through an outlet hole (28) provided from the pump housing (10) to the casing (2), A pressure chamber (29) communicating with the outlet hole (28) is formed between opposing surfaces of the casing (2) and the pump housing (10), and the pressure of the pressure chamber (29) causes the pump housing (10) to A hydraulic pump characterized in that a pressure receiving part (32) facing the pressure chamber (29) is provided in the pump housing (10) so as to be biased in the direction of contact with the bottom surface of the accommodation recess (2a, 2b). pump equipment. 2. In the pump housing according to claim 1, the first sealing member (31) that is in close contact with the outer circumferential surface of the pump housing (10) is arranged in an annular groove (33) on the inner circumferential surface of the accommodation recess (2a, 2b). While the first seal member (3
The accommodation recesses (2a, 2b) are spaced apart from the housing recess (2a, 2b) in the axial direction from
A second sealing member (32) that is in close contact with the inner circumferential surface of the pump housing (10) is attached to the annular groove (34) on the outer circumferential surface of the pump housing (10), and these first and second sealing members (31, 32) close the pressure chamber ( 29), and the second seal member (32) serves as the pressure receiving portion.