Electro-hydraulic pump capable of adjusting distance from induction magnetic steel to sensor

Abstract

The utility model relates to an electro-hydraulic pump structure. An electro-hydraulic pump capable of adjusting the distance between induction magnetic steel and a sensor comprises a motor body, a controller cover is arranged on the motor body, a rotor and a stator are arranged in the motor body, a PCBA board is installed above the rotor, the sensor is installed on the PCBA board, the rotor comprises a rotating shaft, a bracket is installed on the rotating shaft, the induction magnetic steel is installed on the bracket, and the sensor is installed on the bracket. The induction magnetic steel corresponds to the sensor, and the mounting positions of the bracket and the rotating shaft are determined according to the distance between the induction magnetic steel and the sensor. According to the electro-hydraulic pump capable of adjusting the distance from the induction magnetic steel to the sensor, the stability of the sensors of batch products is ensured, and the rotating speed control precision of the electro-hydraulic pump is improved; the technical problems that in the prior art, due to limitation of a magnetic steel installation mode, the precision of a sensor is not enough, and product difference is large are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an electro-hydraulic pump structure, especially to an electro-hydraulic pump with adjustable distance between inductive magnetic steel and sensor. BACKGROUND

[0002] Generally, in the design of a conventional motor oil pump controller assembly, an angle sensor is fixed on a PCBA by SMT, and inductive magnetic steel is directly fixed on a rotating shaft by adhesive bonding, so that the distance between the angle sensor and the inductive magnetic steel can be calculated by dimensional chain calculation, but the dimensional chain is very long, from the PCBA to the motor stator, to the motor housing, to the rotor core, and finally to the rotating shaft and the inductive magnetic steel, so the distance tolerance between the angle sensor and the inductive magnetic steel is very large, and the angle sensor has a relatively strict requirement on the distance, because different distances result in different magnetic induction intensity, and the voltage amplitude generated by the angle sensor is also different, so the control accuracy of different products will be different, and even if the distance is too large, the angle sensor cannot work, resulting in that the controller cannot control the motor commutation, and thus the product fails, which is inconsistent with the development trend of the future automotive industry. The electro-hydraulic pump product must ensure control accuracy in the future, and the difference between mass-produced products must be very small. SUMMARY

[0003] The utility model provides a kind of electro-hydraulic pump with adjustable distance between inductive magnetic steel and sensor, which ensures the stability of sensors in batch production and increases the speed control accuracy of electro-hydraulic pump, solves the technical problems of insufficient sensor accuracy and large product variability caused by the limitation of magnetic steel installation method in the prior art.

[0004] The utility model also provides an electro-hydraulic pump that eliminates the space reserved for punching or hot riveting on the PCBA, reduces the size of the PCBA and lowers the cost, solves the technical problem of large size and high cost of PCBA board caused by the need for installation space when installing and fixing the PCBA in the prior art.

[0005] The technical problem of the utility model is solved by the following technical scheme: an electro-hydraulic pump capable of adjusting the distance between an inductive magnetic steel and a sensor, comprising a motor body, a controller cover arranged on the motor body, a rotor and a stator arranged in the motor body, a PCBA board arranged above the rotor, and a sensor arranged on the PCBA board, wherein the rotor comprises a rotating shaft, a bracket arranged on the rotating shaft, and an inductive magnetic steel arranged on the bracket, the inductive magnetic steel corresponds to the sensor, and the mounting position of the bracket and the rotating shaft is determined according to the distance between the inductive magnetic steel and the sensor. The inductive magnetic steel is fixed in the bracket, the distance between the inductive magnetic steel and the angle sensor is adjusted by increasing the structure of the inductive magnetic steel bracket, the distance between the inductive magnetic steel and the sensor is determined according to the requirements of the sensor, the size of the inductive magnetic steel bracket is controlled according to the distance, the distance between the inductive magnetic steel and the angle sensor of different products in batches can be kept consistent, so that the amplitude of the sin and cos waveforms generated by the angle sensor of the batch products is the same, and thus the waveform limit of the batch products can be determined, thereby achieving the purpose of increasing the control precision of the rotation speed of the electro-hydraulic pump product.

[0006] Preferably, the bracket comprises a bracket body and a connecting shaft, and a through hole is arranged in the center of the rotating shaft, and the connecting shaft is in interference fit with the through hole. The connecting shaft of the bracket can be designed to be very long, so that the distance between the inductive magnetic steel and the angle sensor can be adjusted by controlling the pressing height.

[0007] Preferably, a groove is arranged on the bracket body, and the inductive magnetic steel is arranged in the groove. The magnetic steel is fixed in the groove of the bracket body by glue, and the structure is simple and the installation is convenient.

[0008] Preferably, an upper pressing column is arranged on the controller cover, a lower supporting column corresponding to the upper pressing column is arranged on the stator, the upper pressing column and the lower supporting column are located on the same axis, the lower end of the upper pressing column abuts against the PCBA board, and the upper end of the lower supporting column abuts against the PCBA board. Thus, the space for pre-drilling or hot riveting on the PCBA is saved, the size of the PCBA is reduced, the cost is reduced, the weight and space of the assembly are reduced, and the development direction of light weight, miniaturization and low cost of automobiles is met.

[0009] Preferably, the upper pressing columns are uniformly distributed on the controller cover, and the lower supporting columns are uniformly formed on the stator shell. The stress is uniform and the fixing effect is good.

[0010] Preferably, a sealing gasket is arranged on the end surface where the motor body and the controller cover meet. Not only the machining of the sealing ring groove is saved, but also the use of the sealing ring lubricating grease is saved, thereby reducing the cost of the product.

[0011] As preferred, the bracket is integrally formed of die-cast aluminum alloy material. The induction magnetic steel bracket made of ADC12 material also hinders the transmission of the magnetic field to the rotating shaft, prevents the magnetic steel from leaking in the axial direction, enhances the magnetic field strength, and makes the sensor more accurate.

[0012] Therefore, the electro-hydraulic pump with adjustable distance from induction magnetic steel to sensor has the following advantages:

[0013] 1) The distance from induction magnetic steel to angle sensor is adjusted by increasing the structure of the induction magnetic steel bracket, which can ensure that the distance from induction magnetic steel to angle sensor of different products in batch remains consistent, and increase the control precision of the rotation speed of the electro-hydraulic pump.

[0014] 2) The upper pressing column and the lower supporting column correspond to the press-fitting of the PCBA, which saves the space for pre-drilling or hot riveting on the PCBA, thereby reducing the size of the PCBA, reducing the cost, reducing the weight and space of the assembly, and very much in line with the development direction of lightweight, miniaturization and low cost of automobiles.

[0015] 3) The controller cover and the motor body are sealed with a sealing gasket, which reduces the cost of the product. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a perspective exploded view of an electro-hydraulic pump with adjustable distance from induction magnetic steel to sensor.

[0017] Figure 2 It is Figure 1 a partial enlarged sectional view.

[0018] Figure 3 It is a perspective view of the bracket.

[0019] Figure 4 It is Figure 1 a perspective view of the stator housing.

[0020] Figure 5 It is Figure 1 a perspective view of the controller cover. DETAILED DESCRIPTION

[0021] The technical solutions of the utility model will be further specifically described below by examples and in combination with the drawings.

[0022] Example:

[0023] As Figure 1 and 2As shown, an electro-hydraulic pump with adjustable inductive magnetic steel to sensor distance includes a motor body 1, and a controller cover 2 is buckled above the motor body 1. The outer circumferential surface of the controller cover 2 is integrally formed with three protruding lugs 17, bolt holes are opened in the lugs 17, and the controller cover 2 and the motor body 1 are fixed by bolts 5. A ring-shaped sealing gasket 6 is installed on the end surface of the controller cover 2 and the motor body 1. Three upper pressing columns 4 are integrally formed on the bottom surface of the controller cover 2 (as shown in Figure 4 ). A rotor and a stator that cooperate with each other are installed in the motor body 1. A PCBA board 7 is installed above the stator, and an angle sensor 3 is installed at the center of the PCBA board 7. A rotating shaft mounting hole 18 is provided at the center of a stator housing 9, and a lower support column 8 is integrally formed on the upper end surface of the stator housing 9 (as shown in Figure 5 ), and the lower support column 8 is uniformly distributed on the upper end surface of the stator housing 9. The axis of the lower support column 8 coincides with that of the upper pressing column 4, the upper pressing column 4 and the lower support column 8 abut on the PCBA board 7, and the PCBA board 7 is fixed by cooperation of the upper pressing column 4 and the lower support column 8. A rotating shaft 11 is installed in the rotating shaft mounting hole 18, a through hole 12 is provided at the upper end of the rotating shaft 11, and a bracket 10 is installed in the through hole 12 (as shown in Figure 3 ). The bracket 10 includes an integrally formed bracket body 15 and a connecting shaft 16, and the connecting shaft 16 is in interference fit with the through hole 12. A recess 14 is opened in the bracket body 15, and an inductive magnetic steel 13 is fixed in the recess 14 by glue. The inductive magnetic steel 13 corresponds to the angle sensor 3, and the height of the assembly of the connecting shaft 16 and the through hole 12 is determined according to the distance requirement between the inductive magnetic steel 13 and the angle sensor 3. The bracket 10 is formed of die-cast aluminum alloy material.

[0024] The specific embodiments described herein are merely illustrative of the present application. Various modifications or changes can be made to the described embodiments without departing from the spirit of the application, and the scope of the appended claims.

Claims

1. An electro-hydraulic pump with adjustable inductive magnetic steel to sensor distance, comprising a motor body, a controller cover is arranged on the motor body, a rotor and a stator are arranged in the motor body, and a PCBA board is installed above the rotor, characterized in that: A sensor is installed on a PCBA board, the rotor comprises a rotating shaft, a bracket is installed on the rotating shaft, and an inductive magnetic steel is installed on the bracket, the inductive magnetic steel corresponding to the sensor, and the installation position of the bracket and the rotating shaft is determined according to the distance between the inductive magnetic steel and the sensor.

2. The electro-hydraulic pump with adjustable distance between the inductive magnetic steel and the sensor according to claim 1, characterized in that: The bracket comprises a bracket body and a connecting shaft, and a through hole is formed in the center of the rotating shaft, and the connecting shaft is in interference fit with the through hole.

3. An electro-hydraulic pump with adjustable inductive magnetic steel to sensor distance according to claim 2, characterized in that: A groove is formed in the bracket body, and the inductive magnetic steel is installed in the groove.

4. The electro-hydraulic pump of adjustable distance between the inductive magnetic steel and the sensor according to claim 1 or 2 or 3, characterized in that: An upper pressing column is arranged on the controller cover, a lower supporting column corresponding to the upper pressing column is arranged on the stator, the upper pressing column and the lower supporting column are located on the same axis, the lower end of the upper pressing column abuts against the PCBA board, and the upper end of the lower supporting column abuts against the PCBA board.

5. An electro-hydraulic pump with adjustable inductive magnetic steel to sensor distance according to claim 4, characterized in that: The upper pressing columns are uniformly distributed on the controller cover, and the lower supporting columns are uniformly formed on the stator shell.

6. The electro-hydraulic pump with adjustable distance between the inductive magnetic steel and the sensor according to any one of claims 1 to 3, characterized in that: A sealing gasket is arranged on the end surface of the motor body and the controller cover.

7. The electro-hydraulic pump with adjustable distance between the inductive magnetic steel and the sensor according to any one of claims 1 to 3, characterized in that: The bracket is integrally formed of die-cast aluminum alloy.

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