JP2001090651A - Hydraulic pump device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hydraulic pump device provided with construction capable of facilitating the hydraulic pump device assembling process of providing two bearing on the pump side to make the whole compact. SOLUTION: The hydraulic pump device is provided with a pump housing 3 having a pump part 7 for feeding fluid under pressure, and an insertion hole 5, a first bearing 17 provided in the insertion hole 5, a motor 19 provided with a motor body 25 and an output shaft 27 which extends from the motor body to the insertion hole 5 side and which has a tip part supported by the first bearing 17, a pump-driving part 31 which is positioned on the output shaft 27 on the base end side from the tip and which is fixed to a position connectable to the pump part 7, a second bearing 32 which is fixed on the output shaft 27 on the more and more base end side from the pump-driving part, and an end plate 39 which is provided on the periphery of the second bearing 33 to hold the second bearing on the output shaft and which is forced in an inlet part 41 of the insertion hole to position the output shaft in the insertion hole. The motor 19, the pump-driving part 31, the second bearing 33, and the end plate 39 are integrally assembled to form a motor assembly 45.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an antilock brake system (ABS), a traction control system (ASR), and an eletronic stability system.
Program (ESP) and Electronic Hydro
The present invention relates to a hydraulic pump device that is used for a booster (EHB) or the like and that pumps oil or the like.

[0002]

2. Description of the Related Art In a conventional hydraulic pump device, the distance between two bearings is increased, and the output shaft is bent by a pump load. Therefore, a high-strength member is required to support the load applied to the motor, and there is a problem that the motor cannot be made large or light. In order to solve such a problem, Japanese Patent Publication No. 2503065 discloses that two output bearings of a motor are not supported on both sides of the motor but an eccentric cam for driving the pump is sandwiched between the pumps. Is disclosed.

[0003]

However, the structure of the present invention complicates the process of assembling the motor to the pump housing. That is, as shown in FIG.
When the motor 103 is mounted on the first bearing 10, the first bearing 10
5. The eccentric cam 107 for driving the pump, the second bearing 109 and the washer 111 are connected in this order to the output shaft 11 of the motor 103.
3 to connect the output shaft 113 to the pump housing 10.
One central hole 115 must be inserted.

For this reason, as shown in FIG. 5, the inner race of the first bearing 105 is supported by a jig 117 having a through hole at the center, and the jig 117 is inserted into the through hole of the jig 117 by a rod-shaped jig 119. In this method, the positions of the first bearing 105, the second bearing 109, and the eccentric cam 107 are determined, and the output shaft 113 is press-fitted into the bearings 105, 109 and the eccentric cam 107. However, due to the complexity of such techniques,
There is a disadvantage that the production efficiency is poor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hydraulic pump device having a structure in which two bearings are provided on the pump side to facilitate the assembly process of a hydraulic pump device which is made compact as a whole, and a motor assembly incorporated therein. Is to provide.

[0006]

According to a first aspect of the present invention, there is provided a hydraulic pump device according to the first aspect of the present invention, comprising: a pump housing having a pump portion for pumping a fluid and an insertion hole; A motor including a first bearing provided in the insertion hole, a motor main body, an output shaft extending from the motor main body to the insertion hole side and having a front end supported by the first bearing; A pump drive section fixed on the output shaft on the base end side and connectable to a pump section, and a second bearing fixed on the output shaft on the base end side further than the pump drive section; An end plate that is provided around the second bearing, holds the second bearing on the output shaft, and is press-fitted into an inlet of the insertion hole to position the output shaft in the insertion hole. And the mode , Pump driving portion, the second bearing and the end plate is characterized in that it constitutes a motor assembly are assembled integrally.

According to the present invention, a motor, a pump driving unit,
Since the second bearing and the end plate are integrally assembled, the tip of the output shaft of the motor can be inserted into the first bearing without holding the pump drive unit and the bearing using a jig as in the related art. The hydraulic pump device can be easily assembled simply by inserting the end plate into the inlet of the insertion hole at the same time as the insertion. Also, at the time of assembly, the core of the output shaft is naturally positioned simply by pressing the end plate into the inlet of the insertion hole.

According to a second aspect of the present invention, in the hydraulic pump device according to the first aspect, the end plate includes a flange, and the flange abuts on an inlet end of the insertion hole. An axial position of the output shaft in the insertion hole is defined.

According to the present invention, when the end plate is press-fitted into the insertion hole, the press-fitting operation is completed by the flange of the end plate abutting against the inlet end of the insertion hole. When received in the first bearing, the pump drive will be positioned in a position that is aligned with the pump component.

According to a third aspect of the present invention, in the hydraulic pump device according to the first or second aspect, at least the vicinity of the insertion hole of the pump housing is made of aluminum, and the second bearing is provided. At least the outer race and the end plate are made of iron, and a clearance is formed between the cylindrical portion of the end plate and the inner surface of the insertion hole.

Regarding the present invention, the vicinity of the insertion hole of the pump housing has conventionally been made of aluminum, and the outer race of the second bearing has also been made of iron. In this case, if the outer race is press-fitted into the insertion hole of the pump housing as it is, the press-fit state of the outer race changes due to the difference in the thermal expansion coefficient between iron and aluminum, and there is a possibility that the shaft of the output shaft may be shaken.

In this respect, in the present invention, since the outer race made of iron is held inside the end plate made of iron, the relative positional relationship between the end plate and the outer race does not change even if the end plate and the outer race both expand thermally. In addition, the problem of shaft deflection of the output shaft does not occur. Further, since a clearance is formed between the cylindrical portion of the end plate and the inner surface of the insertion hole, even if there is a difference in thermal expansion between the vicinity of the insertion hole and the end plate, the difference is absorbed by the clearance, and the axis of the end plate is removed. The problem of blurring does not occur.

According to a fourth aspect of the present invention, there is provided a motor assembly according to the first aspect. By thus assembling the motor, the pump driving section, the second bearing, and the end plate to form a motor assembly, the effects of the first aspect of the present invention can be obtained.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a partially cutaway side view showing a hydraulic pump device 1 according to the present invention. Hydraulic pump device 1
Has a pump housing 3, in which an insertion hole 5 is formed and a pump section 7 is provided. FIG. 1 shows only a part of the pump unit 7, but FIG. 2 shows details of the pump unit 7. As shown in FIG. 2, the pump unit 7 includes a reciprocally movable plunger 9 having a distal end facing the insertion hole 5 in the plunger support 6. In addition, the pump unit 7 urges the plunger 9 into the insertion hole 5. Spring 11 and ball 13 constituting a check valve
And a seal member 15 and the like. Since such a pump unit 7 is conventionally known, a detailed description thereof will be omitted.

Returning to FIG. 1, a first bearing 17 is fixedly provided near the distal end of the insertion hole 5 of the pump housing 3. A motor 19 is provided outside the insertion hole 5. The motor 19 includes a motor body 25 including a rotor 21 and a yoke 23, and an output shaft 27 extending from the center of the motor body 25 toward the center of the insertion hole 5. And In addition,
The opposite side (the right side in FIG. 1) of the output shaft 27 is not extended as shown by a dashed circle 28 in FIG. This is because, in the hydraulic pump device 1 of the present invention, the motor 19 is supported at two places on the output shaft 27 extending toward the insertion hole 5 as described later, so that the output shaft 27 is shortened as much as possible to eliminate bending. And output shaft 2
The purpose of this is to reduce the weight and size of the entire apparatus by omitting the support member on the side opposite to the side 7.

The tip 18 of the output shaft 27 of the motor 19 is rotatably received in the first bearing 17. Further, an eccentric cam 31 corresponding to a pump driving unit is fixed to the output shaft 27 at a position slightly proximal to the distal end 18 (right side in FIG. 1). The eccentric cam 31 is positioned so as to abut the tip of the plunger 9 of the pump section 7. Incidentally, the rotation of the eccentric cam 31 causes the plunger 9 to reciprocate, and the pump unit 7 is driven by the pump.

A second bearing 33 is fixed to the output shaft 27 at a position further proximal to the output shaft 27 than the eccentric cam 31. As described above, according to the present invention, the bearings 17 and 33 are provided on both sides of the output shaft 27 with the eccentric cam 31 serving as the pump driving unit therebetween only on one side of the insertion hole 5 as viewed from the motor 19.
The motor 19 is supported. As described above, it is possible to reduce the weight and size of the entire apparatus.

Around the second bearing 33, a cylindrical portion 35 formed so as to surround the second bearing 33 in a cylindrical shape, and a base end side (motor side) of the cylindrical portion 35 is turned outward by 90 degrees. And an end plate 39 having a flange 37 formed by the following. The cylindrical portion 35 of the end plate 39 has a shape and a size that can be fitted into the cylindrical inner peripheral surface of the inlet 41 of the insertion hole 5. As shown in FIG. 2, the flange 37 of the end plate 39 is located at a position where the tip 18 of the output shaft 27 of the motor 19 is received in the first bearing 17 and the eccentric cam 31 contacts the plunger 9 of the pump unit 7. At this time, the output shaft 27 is in contact with the end face 43 of the entrance 41 of the insertion hole 5 to restrict the output shaft 27 from being inserted further.

Here, the cylindrical portion 35 of the end plate 39,
The relationship between the outer race 34 of the second bearing 33 and the entrance 41 will be described. Both the cylindrical portion 35 of the end plate 39 and the outer race 34 of the second bearing 33 are made of iron. Therefore, even if these members expand due to heat, their thermal expansion coefficients are the same. The core does not shake. On the other hand, the pump housing 3 is made of aluminum for weight reduction. A clearance 45 is formed between the inner wall of the insertion hole 5 and the cylindrical portion 35 of the end plate 39. Therefore, the aluminum pump housing 3 and the iron end plate 39 expand differently due to the difference in thermal expansion coefficient. However, the clearance 45 absorbs the displacement due to the difference in expansion between the two. The core does not shake.

The hydraulic pump device 1 according to the present invention has the above-described configuration. Hereinafter, the operation of assembling the hydraulic pump device 1 will be described. As shown in FIG. 3, before the assembly work is performed, the motor 19, the eccentric cam 31, which corresponds to a pump driving unit, the second bearing 33, and the end plate 39 are integrally assembled to form a motor assembly 45. Such a configuration of the motor assembly 45 is a characteristic configuration of the present invention, and as a result, the work of assembling the motor assembly 45 to the pump housing 3 can be performed extremely easily as compared with the related art.

That is, the tip 18 of the output shaft 27 protruding from the motor assembly 45 is inserted into the insertion hole 5 so as to be inserted into the first bearing 17. At this time, the cylindrical portion 35 of the end plate 39 is simultaneously inserted into the entrance 41 of the insertion hole 5.
Press-fit. The press-fitting is completed when the flange 37 of the end plate 39 contacts the end face 43 of the inlet 41. Thus, the axis of the output shaft 27 is automatically defined, and the eccentric cam 31 is positioned at the position of the plunger 9 of the pump unit 7. When assembling the motor assembly 45 to the pump housing 3, it is possible to easily assemble the motor assembly 45 in a short time without using any jig.

[0022]

According to the present invention, the motor, the pump driving section, the second bearing, and the end plate are integrally assembled to form a motor assembly. Therefore, the end plate of the motor assembly is inserted into the pump housing. Just by press-fitting the hole into the hole, it can be easily assembled in a short time without using a jig. Also, when the end plate is pressed into the inlet of the insertion hole, the axis of the output shaft is automatically determined.

Since the end plate has a flange, the eccentric cam is automatically positioned at the position of the plunger of the pump when the end plate is pressed into the insertion hole and the flange comes into contact with the inlet end of the insertion hole. Will be done.

Further, at least the vicinity of the insertion hole of the pump housing is made of aluminum, and at least the outer race and the end plate of the second bearing are made of iron, and the gap between the cylindrical portion of the end plate and the inner surface of the insertion hole is made. , The outer race and the end plate have the same thermal expansion coefficient even when each member is heated, so that there is no displacement between them. Although the end plate and the periphery of the insertion hole have different coefficients of thermal expansion, the degree of expansion is different. However, the clearance absorbs such a shift due to the difference in expansion, and does not affect the shaft deflection of the output shaft.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view showing a hydraulic pump device of the present invention.

FIG. 2 is an enlarged cross-sectional view of the periphery of a pump section, an eccentric cam, and first and second bearings.

FIG. 3 is a side sectional view showing the motor assembly before being assembled to the pump housing.

FIG. 4 is an exploded side view showing a state before components of a conventional hydraulic pump device are assembled.

5 is a side sectional view showing a state where components of the hydraulic pump device of FIG. 4 are assembled using a jig.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic pump device 3 Pump housing 5 Insertion hole 6 Plunger support 7 Pump part 9 Plunger 11 Coil spring 13 Ball 15 Seal member 17 First bearing 18 Output shaft tip 19 Motor 21 Rotor 23 Yoke 25 Motor body 27 Output shaft 28 Broken circle 29 Cover 31 Eccentric cam 33 Second bearing 34 Outer race 35 Cylindrical part 37 Flange 39 End plate 41 Inlet part 43 Inlet end face 45 Motor assembly

Claims (4)

[Claims] A pump housing for pumping a fluid and a pump housing having an insertion hole, a first bearing provided in the insertion hole, a motor body, and extending from the motor body to the insertion hole side;
A motor including: an output shaft having a distal end supported by the first bearing; and a pump driving unit fixed to a position connectable to a pump unit on the output shaft proximal to the distal end. A second bearing fixed on the output shaft further proximal to the pump drive unit, provided around the second bearing, holding the second bearing on the output shaft, and inserting the second bearing into the output shaft. An end plate that is press-fitted into an inlet of the hole to perform positioning of the output shaft in the insertion hole. The motor, a pump driving unit, a second bearing, and an end plate are integrally assembled, and a motor is provided. A hydraulic pump device comprising an assembly. 2. The device according to claim 1, wherein the end plate includes a flange, and the flange abuts on an inlet end of the insertion hole to define an axial position of the output shaft in the insertion hole. Characteristic hydraulic pump device. 3. The end according to claim 1, wherein at least a portion near the insertion hole of the pump housing is made of aluminum, and at least an outer race of the second bearing and the end plate are made of iron. A hydraulic pump device, wherein a clearance is formed between a cylindrical portion of a plate and an inner surface of the insertion hole. 4. The motor assembly according to claim 1, wherein: