JPH05976U - Electric pump - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent hydraulic fluid from entering the motor easily and to prevent problems with the electric motor. [Constitution] In an electric pump 1, an inner diameter d _p of a crank chamber 2a is set to be larger than an inner diameter d _m of an opening 5a of a motor housing 5. As a result, a step portion 8 is formed at the bottom of the crank chamber 2a and the opening 5a. Therefore, the hydraulic fluid leaked into the crank chamber 2a is not supplied to the electric motor unit M.
Even if an attempt is made to infiltrate into the electric motor unit M side, it becomes difficult for the hydraulic fluid to permeate into the electric motor unit M side through the opening 5a because of the stepped portion 8. In this way, the hydraulic fluid is less likely to enter the electric motor section M side, so that the malfunction such as the electric motor 6 not working does not occur.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is applicable to a hydraulic pressure control circuit such as an anti-skid brake control circuit. The present invention relates to a pump, and more particularly to a pump that is rotationally driven by an electric motor.

[0002]

[Prior art]

  For example, in an anti-skid brake control device mounted on a car, If the wheels tend to skid during rake operation, the hydraulic fluid in the brake cylinder will be To the skid device and reduce the pressure of the brake cylinders And the hydraulic fluid discharged to the sump device is mastered by a pump. It flows back to the binder, and the working fluid of the master cylinder that contains the returned working fluid is re-blended. The brake cylinder is re-pressurized by feeding to the rake cylinder. So In the case of, the pump for returning this hydraulic fluid is generally an electric piston pump. Is often used.

[0003]   As shown in FIGS. 4 and 5, the electric piston pump 1 has a pump portion P and an electric power source. And a moving motor section M. The pump part P includes the crank chamber 2a and A pump housing 2 having an elongated hole 2b communicating with the rank chamber 2a, and the pump housing 2 And a piston pump 3 disposed in the pump housing 2. piston The pump 3 includes a rotating shaft 3a arranged eccentrically with respect to the center of the crank chamber 2a, Cylinder housing fitted in the long hole 2b and fixed to the pump housing 2 3b and a plunger slidably inserted in the hole of the cylinder housing 3b. 3c and a check valve 3d arranged in a passage formed in the plunger 3c, A check valve 3e arranged in the cylinder housing 3b is provided.

[0004]   Further, an eccentric cam 3f is fixed to the rotating shaft 3a, and the spring causes the plunge to move. One end of the cam 3c is always in contact with the cam surface of the eccentric cam 3f. But Thus, when the rotating shaft 3a rotates, the eccentric cam 3f also rotates, and the eccentric cam 3f rotates. Causes the plunger 3c to slide back and forth in the hole of the cylinder housing 3b in the left-right direction. Become so.

[0005]   In the figure, 2c is a suction passage, 2d is a discharge passage, and 4 is a sump device. Also , Cylinder housing 3b, plunger 3c, check valves 3d, 3e, suction passage 2c, the discharge passage 2d, and the sump device 4 are also arranged on the opposite side of the rotary shaft 3a. It is set up.

[0006]   On the other hand, as shown in FIG. 4, the electric motor M is fixed to the pump housing 2. , A motor housing 5 having an opening 5a communicating with the crank chamber 2a, and a motor housing 5 The electric motor housing 5 is provided in the motor housing 5. And mo Through the opening 5a of the motor housing 5, the output rotary shaft 6a of the electric motor 6 and the pump The rotary shaft 3a of the pump 3 is connected to the rotary shaft 3a (in the illustrated example, both rotary shafts 3a and 6a are Is formed integrally). In that case, the rotary shaft 3a is eccentric to the output rotary shaft 6a. Are arranged. Further, the output rotary shaft 6a is attached to the bearing 7 at the opening 5a. More rotatably supported.

[0007]   When the electric motor 6 is driven to rotate, the eccentric cam 3f rotates and the plunger 3 c reciprocates left and right, and by the left and right reciprocating motion of the plunger 3c, the inside of the sump device 4 is The hydraulic fluid is sucked in through the suction passage 2c and discharged through the discharge passage 2d. Growls

[0008]

[Problems to be solved by the device]

  By the way, in such an electric piston pump 1, the liquid of the plunger 3c is When the tightness is lowered, the hydraulic fluid is discharged from the hole of the cylinder housing 3b into the crank chamber 2a. It will leak to people. Then, the hydraulic fluid leaked into the crank chamber 2a is pumped. It is configured to be discharged from a drain passage 2e formed in the housing 2 for use.   However, in this conventional electric piston pump 1, as is clear from FIG. The inner diameter of the opening 5a of the motor housing 5 is equal to the inner diameter of the crank chamber 2a. The inner diameter of the opening 5a is the inner diameter of the crank chamber 2a. Is set larger than. Therefore, the hydraulic fluid leaked into the crank chamber 2a Through the opening 5a and the bearing 7 to enter the motor housing 5. There is When the hydraulic fluid enters the motor housing 5, the electric motor 6 operates. Problems such as not working will occur.

[0009]   The present invention has been made in view of these problems, and its purpose is to Of the electric motor described above by making it difficult for hydraulic fluid to penetrate into the motor. It is to provide an electric pump capable of suppressing the above.

[0010]

[Means for Solving the Problems]

  In order to solve the above problems, the present invention provides a pump housing and a pump housing. A pump portion provided with a piston pump disposed in the pump housing; Motor housing coupled to pump housing and motor housing Electric motor provided with an electric motor for driving the piston pump. An electric pump including a pump housing and a motor. Between the housing and the housing, the hydraulic fluid in the pump housing is connected to the motor housing. Is provided with a hydraulic fluid infiltration suppressing means for suppressing infiltration into the ring. I am trying. In that case, as the hydraulic fluid invasion suppressing means, as in the invention of claim 2, The bottom part of the pump housing is lower than the bottom part of the motor housing. In addition, the pump housing and the motor can be configured as in the invention of claim 3. It can be configured with a hydraulic fluid infiltration suppression plate that is interposed between the It

[0011]

[Action]

  In the electric pump of the present invention having such a configuration, the hydraulic fluid infiltration suppressing means is The hydraulic fluid on the pump side can be suppressed from entering the electric motor side. It Therefore, problems such as inoperability of the electric motor caused by the intrusion of hydraulic fluid may occur. Can be prevented.

[0012]

【Example】

  Embodiments of the present invention will be described below with reference to the drawings.   FIG. 1 is a partial sectional view showing an embodiment of an electric pump according to the present invention. It is a figure similar to. The same components as those of the above-mentioned conventional example should be assigned the same reference numerals. Therefore, the description thereof will be omitted.

As shown in FIG. 1, in the electric pump 1 of this embodiment, the inner diameter d _p of the crank chamber 2 a is set larger than the inner diameter d _m of the opening 5 a of the motor housing 5. That is, d _p > d _m is set. As a result, a step portion 8 whose opening 5a side is higher than the crank chamber 2a side is formed at the bottom of the crank chamber 2a and the opening 5a. Therefore, even if the hydraulic fluid leaking into the crank chamber 2a tries to infiltrate into the electric motor portion M side, this step portion 8 makes it difficult for the hydraulic fluid to permeate into the electric motor portion M side through the opening 5a. That is, the step portion 8 constitutes the hydraulic fluid invasion suppressing means of the present invention. As a result, most of the hydraulic fluid in the crank chamber 2a is discharged through the drain passage 2e.

[0014]   Since it becomes difficult for the hydraulic fluid to enter the electric motor M side as described above, Problems such as 6 not working do not occur.

[0015]   FIG. 2 is a partial sectional view showing another embodiment of the electric pump according to the present invention. It is a figure similar to FIG. Similarly, the same components as those of the above-described conventional example are designated by the same reference numerals. Therefore, the description thereof will be omitted.

[0016]   As shown in FIG. 2, in this embodiment, a pump housing 2 and a motor housing are used. A hydraulic-fluid infiltration suppression plate 9 is interposed between the valve 5 and the valve 5. As shown in FIG. The hydraulic fluid invasion suppressing plate 9 is formed by an annular plate having a hole 9a formed in the center thereof. In that case, the inner diameter of the central hole 9a is smaller than the inner diameters of the crank chamber 2a and the opening 5a. The size is set so that the right end side of the output rotary shaft 6a can penetrate. did Therefore, the hydraulic fluid intrusion suppressing plate 9 prevents the hydraulic fluid leaking into the crank chamber 2a from being electrically charged. Even if an attempt is made to infiltrate into the dynamic motor section M side, the infiltration of hydraulic fluid into the electric motor section M side is suppressed. Controlled. That is, the hydraulic fluid infiltration suppressing plate 9 constitutes the hydraulic fluid infiltration suppressing means of the present invention. are doing. As a result, most of the hydraulic fluid in the crank chamber 2a passes through the drain passage 2e. The electric motor 6 will not be activated, and the malfunction will not occur. .

[0017]   As the hydraulic fluid invasion suppressing means of the present invention, the step portion 8 shown in FIG. It can also be configured by combining with the hydraulic fluid invasion suppressing plate 9 shown in FIG. Also, The present invention can be used in hydraulic control circuits other than anti-skid brake control circuits. It can also be applied to an electric pump.

[0018]

[Effect of device]

  As is clear from the above description, according to the electric motor of the present invention, Of the hydraulic fluid by means of the hydraulic fluid invasion suppressing means provided between the housing and the motor housing. Can be suppressed from entering the electric motor M side. Therefore, It is possible to prevent problems such as inoperability of the electric motor caused by penetration.

[Brief description of drawings]

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

FIG. 2 is a sectional view partially showing another embodiment of the present invention.

FIG. 3 is a plan view showing an example of a hydraulic fluid penetration suppression plate used in this embodiment.

FIG. 4 is a sectional view partially showing a conventional electric pump.

FIG. 5 shows the conventional electric pump shown in FIG.
FIG. 5 is a cross-sectional view taken along the line V.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric pump, 2 ... Pump housing, 2a ... Crank chamber, 2c ... Suction passage, 2d ... Discharge passage, 2e ... Drain passage, 3 ... Piston pump, 3a ... Rotating shaft, 3b ... Cylinder housing, 3c ... Plunger, 3d, 3e ... Check valve, 3f ... Eccentric cam, 4 ... Sump device, 5 ... Motor housing, 5a ... Opening, 6 ... Electric motor, 6a ...
Output rotary shaft, 7 ... bearing, 8 ... stepped portion (hydraulic fluid infiltration restriction means), 9 ... hydraulic fluid infiltration suppression plate (hydraulic fluid infiltration restriction means), P ... pump, M ... electric motor, d _p ... Crank Inner diameter of chamber 2a, d _m ... Inner diameter of opening 5a

Claims (3)

[Scope of utility model registration request] 1. A pump unit comprising a pump housing and a piston pump arranged in the pump housing, a motor housing connected to the pump housing, and a motor housing arranged in the motor housing. In an electric pump including an electric motor unit having an electric motor for driving the piston pump, the hydraulic fluid in the pump housing is in the motor housing between the pump housing and the motor housing. An electric pump, characterized in that it is provided with a hydraulic fluid invasion inhibiting means for inhibiting intrusion into the hydraulic pump. 2. The electric pump according to claim 1, wherein in the hydraulic fluid invasion suppressing means, a bottom portion of the pump housing is constituted by a step portion lower than a bottom portion of the motor housing. 3. The hydraulic fluid invasion suppressing means is constituted by a hydraulic fluid invasion suppressing plate interposed between the pump housing and the motor housing. Electric pump.