JPH05288143A - Motor-driven pump - Google Patents

Abstract

PURPOSE:To provide a motor-driven pump allowing a motor and in its turn the whole pump to be made compact in the axial direction of the output shaft of the motor and also enabling the improvement of assembling work performance. CONSTITUTION:The pump housing 44 of a motor-driven pump 10 is divided into a first pump housing 40 and a second pump housing 42. The first pump housing 40 is provided with wiring combined plates 66, 68 embedded therein by insertion-molding, and also a support bearing 38, a brush 76, and the like mounted thereto. Parts are not therefore disposed on the bottom face side of the yoke 16 of a rotor 26, so that a motor and in its turn the whole pump can be made axially compact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pump that pumps fluid by driving a motor.

[0002]

2. Description of the Related Art Conventionally, in an electric pump, for example, an oil pump used for a vehicle brake device, a plunger is operated in a radial direction of an output shaft of a motor. This type of electric pump is constructed by assembling a motor as a single unit and coupling it to the pump side.

In this case, the output shaft of the motor is supported on both ends by the motor yoke and the pump housing via bearings fixed to both ends in the axial direction. Therefore, the shaft length of the output shaft of the motor becomes long, and the electric pump in which such a motor is assembled also becomes large in size, which makes it difficult to mount the motor in a narrow space.

In order to solve this problem, the applicant of the present invention has already devised a structure in which the output shaft of the motor is cantilevered to reduce the size of the motor and thus the size of the electric pump. (For example, Japanese Patent Application No. 2-1
51890 gazette).

The structure disclosed in the above publication will be described below with reference to FIGS. As shown in FIG.
In this electric pump 150, the shaft 1 of the motor 152 is
A rotor 156 is fixed to the middle portion of 54 and a commutator 158 is fixed to the rear end portion. This commutator 15
The brushes 160 to 166 pressed against the peripheral surface of No. 8 are assembled to the brush substrate 172 together with the wiring / combining plates 168 and 170 (see FIGS. 6A to 6C). Further, the brush substrate 172 is It is adapted to be assembled inside the rear end of the yoke 174. Further, on the outside of the rear end portion of the yoke 174, the electrode terminals 168A and 170A of the wiring and wiring plates 168 and 170, and the holder 17 for holding them.
6, a lead wire 180, and a cap 184 for closing the rear end central opening of the yoke 174 are provided.

On the other hand, a bearing 186, an eccentric bearing 188, and a support bearing 190 are fixed to the tip of the shaft 154 in this order.
By mounting the support bearing 190 on the pump housing 192, the motor 152 cantilevers on the pump housing 192.

The procedure for assembling the motor 152 of the above-described electric pump 150 into the pump housing 192 is as follows.

First, as shown in FIGS. 6A to 6C, the wiring plate 16 having a predetermined insulating gap.
The brush 160 on the brush substrate 172 provided with
˜166 are assembled, and in this state, they are fixed in advance to the rear end of the yoke 174. Then, as shown in FIG.
Brush temporary pressing jig 194 and removal guide jig 19
6, the brushes 160 to 166 are temporarily held.
As a result, each of the brushes 160 to 166 is held in the regular position in the motor assembly completed state.

Next, the rotor 156, which is cantilevered by the pump housing 192 by the bearing 186 and the support bearing 190, is inserted into the yoke 174 and fitted to the tip of the temporary brush pressing jig 194. As a result, the axis of the shaft 154 of the rotor 156 and the axis of the temporary brush pressing jig 194 are aligned.

The yoke 174 is pushed into the pump housing 192 side together with the brush substrate 172 while maintaining this axial line coincidence state. During this pressing, the commutator 15 is replaced with the brush temporary pressing jig 194.
The peripheral surface of 8 presses against the brushes 160 to 166 to hold them. Then, the opening side end of the yoke 174 is assembled to the pump housing 192. Finally, the brush temporary pressing jig 194 and the pulling-out guide jig 196 are removed, and the cap 184 closes the central opening of the rear end of the yoke 174 to complete the assembling work. The temporary brush pressing jig 194 and the pulling guide jig 196 are repeatedly used.

In the electric pump 150 assembled through the above assembling procedure, the shaft 1 of the motor 152 is
Since 54 is supported in a cantilever manner, its axial length is shortened, and the motor 152 and thus the electric pump 150 can be miniaturized.

[0012]

However, in the case of this structure, the brush substrate 172 having the wiring / combining plates 168 and 170 is disposed inside the rear end of the yoke 174, and the outside of the rear end of the yoke 174 is disposed. Holder 176,
Since the lead wire 180, the cap 184 and the like are protruded, it is disadvantageous when the axial dimension of the shaft 154 of the motor 152 is further strictly required.

Further, in the case of such a multi-pole motor, since the wiring / combining plates 168 and 170 are arranged in close proximity to the bottom surface of the yoke 174, the bottom surface of the yoke 174 and the wiring are arranged to avoid a short circuit. Combined plate 16
It is necessary to secure an insulation gap with 8, 170 to some extent.

Further, in the case of this structure, since the assembling work using the temporary brush pressing jig 194 and the brush removing guide jig 196 is required as described above, the assembling work becomes complicated. Points also occur.

In consideration of the above facts, the present invention has an object to obtain an electric pump which can reduce the size of the motor and hence the entire pump in the axial direction of the output shaft of the motor and can improve the workability of assembling. is there.

[0016]

According to a first aspect of the present invention, there is provided an electric pump having a commutator fixed to an output shaft, and a commutator side end portion of the output shaft. A first bearing portion, an eccentric cam portion that is fixed to the output shaft adjacent to the first bearing portion and that performs eccentric movement, and that holds the first bearing portion and accommodates the eccentric cam portion, A first pump housing having a pumping means for pumping a fluid by the eccentric movement of the eccentric cam part, and a wiring path through which a feeder line for feeding power to the outside is wired; the eccentric cam part and the commutator. And a power supply means for holding a second bearing portion disposed between the power supply line and the power supply line for supplying power via a brush pressed against the peripheral surface of the commutator. Second pump assembled to the housing to form a pump section Is characterized by comprising a Ujingu, the.

According to a second aspect of the present invention, there is provided the electric pump according to the first aspect, wherein the second pump housing is made of an insulating material and the power feeding means is insert-molded in the second pump housing. It is characterized by being provided by.

[0018]

The operation of the present invention will be described below with reference to the procedure for assembling the electric pump according to the present invention.

First, the second bearing portion is held by the second pump housing. Further, the second pump housing is provided with a power feeding means that is connected to a power feeding line and feeds power via a brush pressed against the peripheral surface of the commutator.

Next, in this state, the second pump housing is fixed to the output shaft of the rotor. After that, the eccentric cam portion and the first bearing portion are fixed to the output shaft in this order. In a state where both are fixed to the output shaft, the commutator side end portion of the output shaft is pivotally supported by the first bearing portion, and the eccentric cam portion is disposed adjacent to the output shaft on the output shaft. The second bearing portion is arranged between the commutator and the commutator.

Next, the second pump housing is assembled to the first pump housing so that the first bearing portion is held and the eccentric cam portion is accommodated. This first pump housing is provided with a pumping means for pumping the fluid by the eccentric movement of the eccentric cam portion, and a wiring path through which a feeder line for feeding power to the outside is wired. Therefore, the pump portion is formed by assembling the second pump housing with the first pump housing. Therefore, when power is supplied by the power supply means, the output shaft rotates, and the eccentric cam portion eccentrically moves accordingly. As a result, the fluid is pumped by the pumping means.

In the electric pump thus assembled, the output shaft is cantilevered by the first pump housing and the second pump housing.

As described above, according to the present invention, the pump housing is constituted by the first pump housing and the second pump housing, and the second bearing portion holds the second bearing portion and the brush housing. Since the power feeding means for feeding power via the is provided, the space on the side opposite to the commutator of the rotor (the space at the bottom of the yoke) can be reduced. Furthermore, since it is not necessary to provide a space for insulation between the power feeding means and the bottom surface of the yoke as in the conventional case, the space at the bottom of the yoke can be reduced also from this point. Therefore, as a synergistic effect of these, it is possible to reduce the size of the electric pump in the axial direction of the output shaft as much as the space is reduced.

Also, the first wiring path is the one through which the power supply line is wired.
Since it is provided in the pump housing, the power supply can be taken out from the first pump housing side, that is, the fluid discharge side and the fluid suction side. Therefore, the peripheral space of the electric pump and the degree of freedom of arrangement can be increased.

Further, the assembling work of the electric pump can be performed by the above assembling procedure without using the jigs such as the jig for temporarily pressing the brush and the guide jig for pulling out which have been conventionally used. Therefore, the workability of assembling the electric pump can be improved.

According to the electric pump of the present invention as set forth in claim 2, in the present invention as set forth in claim 1, the second pump housing is formed of an insulating material, and the power feeding means is insert-molded in the second pump housing. The number of parts is reduced and the reliability of insulation from the surroundings of the power feeding means is improved. Therefore, it is possible to reduce the number of assembly work steps and downsize the electric pump.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The first embodiment of the present invention will be described below with reference to FIGS.
The electric pump 10 according to the embodiment will be described.

As shown in FIG. 1, the electric pump 10
Is composed of a motor unit 12 and a pump unit 14.

The motor section 12 is a cylindrical yoke 1 having a bottom.
6 is provided, and the end portion on the opening side is fixed to the first pump housing 42 described later with the bolt 20 via the O-ring 18. An arc-shaped magnet 22 is fixed to the inner peripheral surface of the yoke 16. Further, a rotor 26 is arranged at the axial center of the yoke 16 so as to face the magnet 22.

The rotor 26 has a shaft 28 as an output shaft.
The commutator 30 is fixed to the intermediate portion in the axial direction. Further, at the other end portion of the shaft 28 in the axial direction, a ball bearing 32 as a first bearing portion is provided.
Is fixed by press fitting. This ball bearing 3
An eccentric bearing 34 as an eccentric cam portion is fixed at a position adjacent to 2 (on the side of the commutator 30). The eccentric bearing 34 includes a ball bearing 35 and an eccentric bush 36 press-fitted into the inner ring of the ball bearing 35.
Is press-fitted and fixed to the shaft center of the eccentric bush 36. Therefore, when the shaft 28 rotates, the eccentric bearing 34 moves eccentrically. Further, an eccentric bearing 34 is provided at an intermediate portion of the shaft 28 in the axial direction.
A support bearing 38 serving as a second bearing portion is fixed between the rectifier and the commutator 30 by press fitting. The support bearing 38 will be described in more detail in relation to the second pump housing 40 described later.

On the other hand, the pump portion 14 is provided with a pump housing 44 consisting of a first pump housing 42 and a second pump housing 40.

The first pump housing 42 is formed with an accommodating portion 46 into which the ball bearing 32 and the eccentric bearing 34 described above are inserted. This housing section 46
Has a substantially columnar shape with its diameter reduced, and the ball bearing 32 is tightly fitted into the diameter reduced portion 46A. Therefore, in the fitted state, the tip of the shaft 28 is pivotally supported. Further, an eccentric bearing 34 is eccentrically movably arranged at the center of the expanded diameter portion 46B of the housing portion 46.

On a part of the outer peripheral surface of the eccentric bearing 34, a plunger 50, which is tightly accommodated in the plunger support 48 so as to reciprocate, abuts. A flow path is formed in the center of the plunger 50 so that oil can flow in. Further, the plunger 50 itself is urged by the compression coil spring 52, and the check ball 56 urged by the compression coil spring 54 is in contact with the lower end of the plunger 50 in a separable manner. Further, another check ball 58 is pressed and biased by a compression coil spring 59 at a position facing the check ball 56.
The check valve is composed of eight.

Therefore, when the eccentric bearing 34 eccentrically moves, the plunger 50 reciprocates, and the check ball 5
6, 58 are open or closed, which causes the first
Oil is sucked and discharged from the suction hole 60 and the discharge hole 62 for oil pressure feeding formed in the pump housing 42. In addition, the plunger 50 and the check ball 5 described above.
6, 58, the suction hole 60, and the discharge hole 62 correspond to the pressure feeding means in the present invention according to claim 1.

Further, the first pump housing 42 includes
In the state shown in FIG. 1, a grommet 64 as a wiring path is mounted slightly above the eccentric bearing 34. In the grommet 64, a wiring / combined plate 6 described later
One end of each of the wiring / combining plates 66 and 68 in the longitudinal direction is accommodated on the left side of the first pump housing 42 in the state shown in FIG. And guides in the direction away from.

On the other hand, as shown in FIG. 2 (A) and FIG. 2 (B), the second pump housing 40 has a ring shape with a through hole 70 formed in the central portion, The collar 7 is tightly fitted in the pump housing 40 in this state.
A bolt 73 is screwed into 2. Further, the second pump housing 40 has the grommet 6 on a part of its peripheral edge.
4 is formed to connect to the grommet 64.

On the surface of the second pump housing 40 (on the side of the rotor 26 in the state shown in FIG. 1), the 4-pole brush 7 is provided.
6, 78, 80, and 82 are radially arranged at equal intervals in the circumferential direction. Each of these brushes 76, 78, 80, 82 is constantly urged toward the center of the through hole 70, and in the state before the shaft 28 penetrates the through hole 70, the tip of each brush is the peripheral edge of the through hole 70. It is in a state in which it is slightly projected. Also, pigtails 76A, 78A, 80A, 82A extend from the upper end surface of each brush.

Wiring plates 66 and 68 as power feeding means are embedded in the second pump housing 40 by insert molding with an insulating resin. The wiring / combining plate 66 has an intermediate portion in the longitudinal direction formed in an arc shape (a lower semicircle in the state shown in FIG. 2A) along the peripheral edge of the through hole 70, and both ends thereof are bent in a direction in which they are separated from each other. Has been done. Further, one end of the wiring / cumulative plate 66 in the longitudinal direction is slightly bent toward the connecting portion 74 side, and then penetrates through the connecting portion 74 toward the grommet 64 side.
It functions as a power supply line (see FIG. 2B). Further, one end of the wiring / combining plate 66 in the longitudinal direction is
It rises from near this side toward the brush 76 side and projects onto the surface of the second pump housing 40.
And in this part, the pigtail 76 of the brush 76
The tip of A is fixed. Also, the wiring and plate 6
The other end portion in the longitudinal direction of 6 also rises toward the brush 80 side and projects onto the second pump housing 40. The tip of the pigtail 80A of the brush 80 is fixed to this portion. That is, the wiring / combining plate 66 connects the pair of brushes 76 and 80 located on one diagonal line in the second pump housing 40.

The other wiring / combining plate 68 is arranged at a position slightly lower than the wiring / combining plate 66 toward the first pump housing 42 side (FIG. 2B).
(Refer to FIG. 4), the mutual wiring and wiring plates 66 and 68 are prevented from interfering with each other. In addition, these wiring and plate 6
A small gap between 6 and 68 is filled with an insulating resin during insert molding of these. The wiring / combining plate 68 connects the remaining pair of brushes 78 and 82 arranged on the other diagonal line. In addition, the wiring and plate 6
The configuration of 8 itself is the same as the configuration of the wiring / combining plate 66 described above, and thus the description thereof is omitted.

On the front surface side of the second pump housing 40, a pair of projections 84 are provided upright between the other ends of the wiring / combining plates 66 and 68 in the longitudinal direction, and between the projections 84. A noise prevention capacitor 86 is sandwiched.

A cylindrical bearing holding portion 88 is formed on the back surface (on the side of the first pump housing 42) of the second pump housing 40, and the shaft of the shaft 28 is formed in the bearing holding portion 88. A support bearing 38 that axially supports the intermediate portion in the direction is held and fixed by press fitting.

The operation of this embodiment will be described below through the procedure of assembling the motor unit 12 to the pump unit 14.

First, the commutator 30 is fixed to the axially intermediate portion of the shaft 28 of the rotor 26. In parallel with this, brushes 76, 78, 80, 82 are attached to the surface of the second pump housing 40 in which the wiring / combined plates 66, 68 are already embedded by insert molding, and the pigtails 76A, 78A, 80A, 82A. Connection work is performed. Further, the support bearing 3 is attached to the bearing holding portion 88.
8 is press-fitted and the condenser 86 is mounted.

Next, the second pump housing 40 is assembled to the axially intermediate portion of the shaft 28. That is, each of the brushes 76, 78, 8 that is slightly protruding
0, 82 are pushed in the direction opposite to the biasing direction (radial direction of the second pump housing 40), and in this state, the shaft 2 is inserted into the through hole 70 of the second pump housing 40.
8 is inserted from the tip side. Then, the support bearing 38 pivotally supports the axially intermediate portion of the shaft 28. Then, the coil springs and the caps are fitted from the rear of the brushes 76, 78, 80, 82, and each brush 76,
78, 80 and 82 are pressed against the commutator 30. afterwards,
The eccentric bearing 34 and the ball bearing 32 are mounted in this order.

Next, while inserting one end portion in the longitudinal direction of the wiring / cumulative plates 66, 68 into the grommet 64,
The second pump housing 40 is fitted to the first pump housing 42. At this time, the ball bearing 32 is connected to the reduced diameter portion 46A of the housing portion 46 of the first pump housing 42.
It is pressed in. Next, in this state, the bolt 73 is screwed into the collar 72 so that the second pump housing 40 becomes the first
Of the pump housing 42. After that, the yoke 16 is fitted through the O-ring 18 and assembled to the first pump housing 42 with the bolt 20. In the state after the assembly is completed, the shaft 28 is cantilevered by the ball bearing 32 and the support bearing 38.

The operation of the electric pump 10 assembled through the above assembling procedure will be briefly described below.

Wiring plates 66 and 68, brush 7
When powered via 6, 78, 80, 82, shaft 28 rotates. As a result, the eccentric bearing 34 moves eccentrically. Therefore, the plunger 50, which is in contact with a part of the peripheral surface of the eccentric bearing 34, reciprocates. As a result, the check balls 56 and 58 are regularly opened and closed, and oil is sucked and discharged from the suction hole 60 and the discharge hole 62.

As described above, in this embodiment, the pump housing 44 is divided into the second pump housing 40 and the first pump housing 42, and the wiring / combining plate 66 is provided on the divided second pump housing 40. Since 68 is insert-molded with an insulating resin, and the support bearing 38 and the brushes 76, 78, 80, 82 are formed into a mountable shape, and these are mounted, only the support bearing 38 is mounted in a state where both are assembled. Without brush 76,
78, 80, 82, commutator 30, wiring and plate 6
Conventionally, the functional components 6 and 68, which are disposed on one end side (the bottom side of the yoke 16) of the shaft 28 in the axial direction, are incorporated into the pump housing 44 side. Therefore, the portion protruding from the pump housing 44 is only the rotor 26 and the yoke 16, and the wiring / cumulative plates 66 and 68 and the yoke 16 do not face each other. Does not require space for insulation. Therefore, the axial size of the motor unit 12 can be reduced, and the electric pump 10 can be reduced in size.

Further, since the wiring / combining plates 66 and 68 are embedded in the second pump housing 40 by insert molding with an insulating resin, the wiring / combining plates 66 and 68 are arranged between each other (between each other along the axial direction of the shaft 28). An insulating resin is filled in the insulating gap. Therefore, both are not short-circuited by dust or the like, so that a slight insulation gap can be formed. Therefore, the motor unit 12 and thus the electric pump 10 can be downsized in the radial direction of the shaft 28. In addition, the number of parts is reduced, and the number of assembly work steps can be reduced. Furthermore, electric pump 1
For the assembly of 0, the conventional brush temporary pressing jig 194,
Since it is not necessary to use a jig such as the extraction guide jig 196, the assembling workability can be improved.

In this embodiment, the shaft 2 is conventionally used.
The brush 7 arranged on one end side in the axial direction of 8
Since 6, 78, 80, and 82 are attached to the second pump housing 40 (arranged on the pump portion 14 side), one end portion in the longitudinal direction of the wiring / combining plates 66 and 68 functioning as a power supply line is One can be guided to the pump housing 42 side. Therefore, the space around the electric pump 10 and the degree of freedom in arrangement can be increased.

Next, an electric pump 100 according to the second embodiment of the present invention will be described with reference to FIGS. 3 and 4. The same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In this embodiment, the spacer 102 to which the brush substrate 101 is fixed constitutes the second pump housing 104. That is, as shown in FIGS. 4 (A) and 4 (B), the spacer 102 is made of metal and has a disc shape. A cylindrical bearing holding portion 88 is integrally formed on the shaft center portion of the spacer 102 toward the first pump housing 42, and the support bearing 38 is press-fitted into the bearing holding portion 88. Further, on the surface of the spacer 102 on the rotor 26 side, a thin disk-shaped brush substrate 101 having a diameter slightly larger than that of the spacer 102 is coaxially arranged and fixed to the spacer 102 in this state. This brush substrate 10
Brushes 106, 108, 110, and 112 are fixed to the apparatus 1 at equal intervals in the circumferential direction. Assembling of the brushes 106, 108, 110, 112 to the brush substrate 101 is performed by the brush holders 106A, 108A, 110.
This is performed by the legs of A and 112A penetrating the brush substrate 101 in the thickness direction and caulking the tips.
In addition, the brush holders 106A, 108A, 110A, 1
The upper end surface of 12A (the surface on the side of the rotor 26) is bent at a right angle, and the pigtails 106B, 108B, 110B,
The front end portions of the 112B are respectively sandwiched. further,
The bent ends of the brush holders 106A and 110A of the brushes 106 and 110 facing each other and the bent ends of the brush holders 108A and 112A of the brushes 108 and 112 are connected to lead wires 114 and 1 as power feeding means.
16 are connected to each other. These lead wires 114,
116 is guided into a rectangular notch 118 formed in the peripheral portions of the brush substrate 101 and the spacer 102, and passes through a grommet 122 as a wiring path penetratingly arranged in the second pump housing 120 ( Therefore, the lead wires 114 and 116 in this portion function as power supply lines) and are guided to the side opposite to the motor section 12.

Also in this embodiment, similar to the first embodiment, the effect of axial miniaturization of the motor portion 12 can be obtained.

[0054]

As described above, in the electric pump according to the present invention as set forth in claim 1, the pump housing is composed of the first pump housing and the second pump housing, that is, divided into the second pump housing. Since the second bearing portion is held on the housing side and the power feeding means is provided, and the second pump housing is assembled to the first pump housing to form the pump portion, the electric pump can be mounted in the axial direction of the output shaft. It has an excellent effect that the size can be reduced and the assembling workability can be improved.

The electric pump according to a second aspect of the present invention is the electric pump according to the first aspect of the present invention, in which the second pump housing is made of an insulating material and the power feeding means is insert-molded in the second pump housing. Since it is provided by the above, there is an excellent effect that the electric pump can be further downsized in the axial direction of the output shaft.

[Brief description of drawings]

FIG. 1 is a sectional view showing an electric pump according to a first embodiment of the present invention.

2 shows the second pump housing of FIG. 1,
2 (A) is a plan view thereof, and FIG. 2 (B) is a sectional view taken along line (B)-(B) of FIG. 2 (A).

FIG. 3 is a sectional view showing an electric pump according to a second embodiment of the present invention.

FIG. 4 shows the second pump housing of FIG.
4 (A) is a plan view thereof, and FIG. 4 (B) is its (B)-
It is a (B) line sectional view.

FIG. 5 is a sectional view showing a conventional electric pump.

6 shows the brush substrate and the like of FIG. 5, and FIG.
Is a plan view thereof, and FIG. 6B is (B)-of FIG.
6B is a sectional view taken along the line (B) and FIG. 6C is a bottom view thereof.

FIG. 7 is a sectional view corresponding to FIG. 5, mainly showing a jig or the like used when assembling the electric pump of FIG.

[Explanation of symbols]

 10 Electric Pump 14 Pump Section 26 Rotor 28 Shaft (Output Shaft) 30 Commutator 32 Ball Bearing (First Bearing Section) 34 Eccentric Bearing (Eccentric Cam Section) 38 Support Bearing (Second Bearing Section) 40 Second Pump housing 42 First pump housing 46 Housing portion 50 Plunger (pressure feeding means) 56 Check ball (pressure feeding means) 58 Check ball (pressure feeding means) 60 Suction hole (pressure feeding means) 62 Discharge hole (pressure feeding means) 64 Grommet (wiring path) ) 66 wiring common plate (power supply means, power supply line) 68 wiring common plate (power supply means, power supply line) 76 brush 78 brush 80 brush 82 brush

Claims (2)

[Claims] 1. A rotor having a commutator fixed to an output shaft, a first bearing portion pivotally supporting a commutator-side end portion of the output shaft, and the first bearing portion adjacent to the first bearing portion. An eccentric cam portion that is fixed to the output shaft and that moves eccentrically; a pumping means that holds the first bearing portion and accommodates the eccentric cam portion, and that pumps fluid by eccentric movement of the eccentric cam portion; A first pump housing provided with a wiring path through which a power feeding line for feeding the electric power is provided; and a second bearing portion arranged between the eccentric cam portion and the commutator. A second pump housing that is connected to a power supply line and that supplies power through a brush that is pressed against the peripheral surface of the commutator and that is assembled to the first pump housing to form a pump portion; An electric pump characterized by having. 2. The electric pump according to claim 1, wherein the second pump housing is made of an insulating material, and the power feeding means is provided in the second pump housing by insert molding.