CN217692890U - Integrated large-load axial electric driving device - Google Patents

Abstract

The utility model discloses an integrated large-load axial electric driving device, which comprises a stator assembly and a rotor assembly; the stator component comprises a stator, and the stator is sleeved outside the rotor component; the rotor assembly includes a rotor assembly; the rotor assembly comprises a rotor shaft assembly and an outer ring bearing; the rotor shaft assembly comprises a rotor shaft and a lead screw nut; the rotor shaft is connected with a screw nut; a permanent magnet is arranged on the periphery of the rotor shaft; the stator is positioned outside the permanent magnet; the utility model discloses integrated form heavy load axial electric drive arrangement adopts hollow motor as power pack, provides the rotation torque, adopts coaxial hollow motor and ball screw pair, and product weight reduces, and driver silence effect is optimized, and whole car arranges the flexibility ratio and improves.

Description

Integrated large-load axial electric driving device

Technical Field

The utility model relates to an electric drive field, concretely relates to big load axial electric drive of integrated form device.

Background

The axial driving device comprises a hollow brushless permanent magnet synchronous motor, an electronic controller, a motor angle sensor, a ball nut pair, a screw rod, a pull rod and other mechanical parts. The hollow motor is used as a power unit of the electric drive device and can accommodate shaft parts driven by the motor to do rotary motion, axial motion and the like in the hollow motor. In the prior art, a general structure for converting electric energy into mechanical energy adopts a worm gear to reduce speed and increase torque, but is limited by the limitations of strength, structure and durability of a worm gear material (synthetic resin), and the thrust is difficult to be increased, so that the requirements of large vehicles cannot be met; the structure that the large belt wheel, the small belt wheel and the belt are adopted for speed reduction and torque increase is limited by the strength and durability of the belt, the thrust is difficult to increase, and the requirement of a large vehicle cannot be met. Therefore, a new speed-reducing and torque-increasing structure is urgently needed by the existing method to change the current situation.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a can bear big axial force, simple structure, the lower integrated form heavy load axial electric drive device of cost.

In order to solve the technical problem, the utility model provides an integrated large-load axial electric driving device, which comprises a stator assembly and a rotor assembly;

the stator component comprises a stator, and the stator is sleeved outside the rotor component;

the rotor assembly includes a rotor assembly;

the rotor assembly comprises a rotor shaft assembly and an outer ring bearing;

the rotor shaft assembly comprises a rotor shaft and a lead screw nut; the rotor shaft is fixedly connected with the screw nut; the stator is positioned outside the permanent magnet;

the outer ring bearing comprises a first outer ring, a second outer ring and a steel ball;

the first outer ring and the second outer ring enclose on the screw nut to form an annular steel ball raceway, and the steel balls are arranged in the annular steel ball raceway.

Preferably, a first annular steel ball raceway is arranged on the periphery of the lead screw nut, a second steel ball raceway is arranged on the first outer ring, and a third steel ball raceway is arranged on the second outer ring; the first annular steel ball raceway, the second steel ball raceway and the third steel ball raceway jointly form an annular steel ball raceway.

Preferably, the electric drive further comprises an end cap;

the end cover is arranged on the periphery of the screw nut;

the outer ring bearing is positioned in the end cover;

a locking nut is arranged on the outer side of the outer ring bearing and is abutted against a second outer ring in the outer ring bearing after penetrating through a screw hole in the end cover; and the second outer ring and the first outer ring are fixed on the inner side wall of the end cover in sequence through the locking nut.

Preferably, a spacer is disposed between the first outer ring and the second outer ring.

Preferably, the outer circumference of one end of the rotor shaft protrudes outwards to form a first step; the tail end of the rotor shaft is connected with a screw nut through a first step; the first step is used for positioning when the rotor shaft and the lead screw nut are assembled;

the periphery of the rotor shaft protrudes outwards at a position which is spaced from the first step by a certain distance to form a second step; the retainer ring is sleeved on the rotor shaft and is abutted against the second step; the second step is used for limiting the axial movement of the retainer ring;

the rotor shaft is provided with a permanent magnet between the first step and the second step; the stator is positioned outside the permanent magnet;

the periphery of the rotor shaft is provided with a deep groove ball bearing, and the wave spring is arranged between the retainer ring and the deep groove ball bearing; the wave spring is used for eliminating the clearance between the deep groove ball bearing and the outer ring bearing.

Preferably, the electric drive further comprises a housing;

the stator, the deep groove ball bearing and the rotor assembly are all arranged in the shell;

the end cover is fixedly covered on the shell.

Preferably, a motor position signal connector hole is formed in the shell, one end of a motor position sensor connector is connected with the circuit board, and the other end of the motor position sensor connector is inserted and connected to a pin of a motor position sensor;

and a power supply connector hole is formed in the shell, one end of the power supply connector is connected with the circuit board, and the other end of the power supply connector is welded on the confluence disc of the motor.

Preferably, the rotor shaft is in interference connection with the spindle nut.

Compared with the prior art, the beneficial effects of the utility model are that:

1. a hollow rotor is adopted, and a lead screw is accommodated in the rotor to pass through, so that the mounting space is reduced;

2. a screw nut is in interference connection with the rotor shaft, the screw nut and the rotor shaft realize synchronous rotation, and the torque of the motor is effectively transmitted to the nut;

3. the outer ring of the screw nut is provided with a first annular steel ball raceway, 2 outer rings of the steel ball raceways with grooves of about one quarter of a circle are arranged, the first annular steel ball raceway of the screw nut and the 2 outer rings of the steel ball raceways form a four-point contact ball bearing, and the four-point ball bearing can be filled with more steel balls due to the fact that the outer ring is of a split structure, so that the four-point ball bearing can bear larger axial force and radial force;

4. an adjusting gasket is arranged between the 2 outer rings and used for adjusting the bearing clearance and improving the transmission rigidity of the driving unit;

5. an oil seal is arranged between the four-point contact ball bearing and the stator and is formed by the first annular steel ball raceway of the lead screw nut and the steel ball raceways of the 2 outer rings, so that bearing grease is prevented from overflowing onto the stator assembly and the rotor assembly;

6. a retainer is arranged in a four-point contact ball bearing formed by a first annular steel ball raceway of the lead screw nut and 2 outer ring steel ball raceways to prevent the adjacent steel balls from generating friction to cause excessive wear of the whole bearing;

7. and a bearing consisting of the lead screw nut, the steel ball and the outer ring is used as a supporting bearing at one end of the motor rotor shaft and can bear large axial force.

8. Two through holes are arranged on the motor shell, one hole is a hole position of a power connector of the motor, and the other hole is a hole position of a signal connector of a motor position sensor. The motor shell is provided with a controller circuit board mounting position, and a power connector and a motor position signal connector are arranged between the controller circuit board and the motor. The power supply connector and the motor convergence plate are welded, and the motor position sensor and the motor sensor are connected in an inserting mode. The circuit board passes through connector lug connection with the motor, has reduced the connector of connecting wire and wire other end, when reduce cost, reduces because of the harmfulness that the welding brought to EMC performance has been improved.

Drawings

Fig. 1 is a schematic structural diagram of an integrated large-load axial electric driving device according to the present invention;

FIG. 2 is a schematic structural view of an outer race bearing;

FIG. 3 is a schematic view of the assembly of the end cap with the housing;

FIG. 4 is a schematic view of the rotor shaft pressed into the lead screw nut;

FIG. 5 is a schematic view of the structure in which permanent magnets are assembled to a rotor shaft;

FIG. 6 is a schematic structural view of a rotor shaft assembly;

FIG. 7 is a schematic structural diagram of a deep groove ball bearing installed in a housing;

FIG. 8 is a schematic view of the stator being installed in the housing;

FIG. 9 is a schematic view of the installation of the oil seal into the end cap;

FIG. 10 is a schematic view of the outer race bearing used in conjunction with a rotor shaft;

FIG. 11 is a schematic view of a rotor assembly;

FIG. 12 is a schematic view of the end cap and rotor assembly being installed into the housing;

FIG. 13 is a schematic view of the motor position sensor mounted to the housing;

FIG. 14 is a schematic view of the assembly of the sensor target plate to the rotor shaft;

FIG. 15 is a schematic diagram of the mounting of the power connector to the circuit board;

FIG. 16 is a schematic view of the assembly of the controller connector to the controller cover;

fig. 17 is a schematic side view of an integrated high-load axial electric drive device according to the present invention;

fig. 18 is a cross-sectional view of an integrated high load axial electric drive of the present invention.

In the drawings, the correspondence between each component and the reference numeral is:

the device comprises a shell 1, a stator 2, a permanent magnet 3, a rotor shaft 4, an oil seal 5, an O-shaped sealing ring 6, a first outer ring 7, an adjusting gasket 8, a second outer ring 9, a retainer 10, an end cover 11, a lock nut 12, a lead screw nut 13, a steel ball 14, a controller connector 15, a connector pin 16, a motor power connector 17, a circuit board 18, a retainer ring 19, a wave spring 20, a motor position signal connector 21, a motor position sensor 22, a sensor target plate 23, a first bolt 24, a deep groove ball bearing 25, a second bolt 31, a controller cover 35 and an O-shaped sealing ring 36.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

The invention is described in further detail below with reference to the accompanying drawings:

the utility model provides an integrated large-load axial electric driving device, as shown in figure 1, comprising a stator assembly and a rotor assembly;

the stator component comprises a stator 2, and the stator 2 is sleeved outside the rotor component;

the rotor assembly includes a rotor assembly;

the rotor assembly comprises a rotor shaft assembly 28 and an outer ring bearing 41;

the rotor shaft assembly 28 comprises a rotor shaft 4 and a lead screw nut 13; the tail end of the rotor shaft 4 is inserted into the lead screw nut 13, the lead screw nut 13 and the rotor shaft 4 are in interference connection 27, the lead screw nut 13 and the rotor shaft 4 rotate synchronously, and the torque of the motor is effectively transmitted to the lead screw nut 13.

The outer ring bearing 41 supports the rotor shaft 4 and bears the radial pressure of the rotor shaft 4. The outer ring bearing 41 comprises a first outer ring 7, a second outer ring 9 and a steel ball 14;

a first annular steel ball raceway 37 is formed in the periphery of the lead screw nut 13, and the cross sections of the first outer ring 7 and the second outer ring 9 are respectively provided with a second steel ball raceway 39 and a third steel ball raceway 40 (shown in fig. 2) which are approximately one quarter of the circumference; the first annular steel ball rolling way 37, the second steel ball rolling way 39 and the third steel ball rolling way 40 jointly form an annular steel ball rolling way, and the steel ball 14 is placed in the annular steel ball rolling way to roll.

The first outer ring 7 and the second outer ring 9 serve as an outer ring portion of the outer ring bearing 41, and the lead screw nut 13 serves as an inner ring portion of the outer ring bearing 41, which are not in direct contact with each other.

For the above embodiments, preferably, an integrated high load axial electric drive further comprises an end cap 11;

the end cover 11 is fixed on the mounting carrier through bolts, so that the axial force on the lead screw is transmitted to the mounting carrier, the axial force on a rotor assembly and a stator assembly of the motor is reduced, and the axial bearing capacity of the motor is improved.

The end cover 11 is also fixedly arranged on the periphery of the screw nut 13; an oil seal 5 is arranged between the end cover 11 and the lead screw nut 13.

An adjusting shim 8 is arranged between the first outer ring 7 and the second outer ring 9 for adjusting the bearing play of the outer ring bearing 41. When the thickness of the adjusting shim 8 is increased, the distance between the first outer ring 7 and the second outer ring 9 is increased, and the play of the outer ring bearing 41 is increased; in contrast, when the thickness of the spacer 8 is reduced, the distance between the first outer race 7 and the second outer race 9 is reduced, and the play of the outer race bearing 41 is reduced.

The outer ring bearing 41 is positioned in the end cover 11 and used as a supporting bearing of one end of the rotor assembly;

a locking nut 12 is arranged on the outer side of the outer ring bearing 41, and the locking nut 12 is abutted with the second outer ring 9 in the outer ring bearing 41 after penetrating through a screw hole on the end cover 11; the second outer ring 9, the adjusting washer 8 and the first outer ring 7 are fixed on the inner side wall of the end cover 11 in sequence through the locking nut 12.

In the present embodiment, when the motor rotates, the rotor shaft 4 and the spindle nut 13 rotate synchronously due to the interference connection 27. At the moment, the screw nut 13 converts the rotary motion of the rotor shaft 4 into the axial motion of the screw through the screw transmission pair with internal threads, and the axial force on the screw acts on the end cover 11 through the outer ring bearing 41 consisting of the screw nut 13, the steel ball 14, the first outer ring 7, the second outer ring 9 and the adjusting gasket 8, and the end cover 11 is fixed on the mounting carrier through bolts, so that the axial force on the screw is transmitted to the mounting carrier, the axial force on the motor assembly and the stator assembly is reduced, and the axial bearing capacity of the motor is improved.

With the above embodiment, preferably, the outer periphery of the trailing end of the rotor shaft 4 is bulged outward to form the first step 42; the tail end of the rotor shaft 4 is connected with the screw nut 13 through a first step 42; the first step 42 is used for positioning when the rotor shaft 4 and the lead screw nut 13 are assembled;

the outer circumference of the rotor shaft 4 is outwardly protruded at a position spaced apart from the first step 42 to form a second step 43; the retainer ring 19 is sleeved on the rotor shaft 4 and abutted against the second step 43, and the second step 43 is used for limiting the axial movement of the retainer ring 19.

The first step 42 and the second step 43 are arranged in sequence from the tail end to the head end of the rotor shaft 4;

the permanent magnet 3 is further installed on the outer circumference of the rotor shaft 4, and the permanent magnet 3 is located between the first step 42 and the second step 43.

The outer periphery of the rotor shaft 4 is also provided with a deep groove ball bearing 25, and the wave spring 20 is arranged between the retainer ring 19 and the deep groove ball bearing 25.

The wave spring 20 is used to eliminate the clearance between the deep groove ball bearing 25 and the outer ring bearing 41: one end of the wave spring 20 is contacted with the retainer ring 19 on the second step 43 of the rotor shaft 4, and the other end is contacted with the inner ring end surface of the deep groove ball bearing 25. The rotor shaft 4 is in interference connection with the lead screw nut 13, and the first annular steel ball raceway 37 of the lead screw nut 13 is an inner ring part of the outer ring bearing 41, and at this time, in essence, the inner ring part of the outer ring bearing 41 includes the lead screw nut 13 and the rotor shaft 4, so one side of the wave spring 20 is in contact with the inner ring end face of the deep groove ball bearing 25, and the other side can be regarded as being in contact with the outer ring bearing 41, so that the gap between the two bearings, namely the deep groove ball bearing 25 and the outer ring bearing 41, is eliminated. The buffer is realized when the rotation direction of the motor is reversed, and the noise is eliminated. As shown in fig. 6.

For the above embodiment, preferably, an integrated high-load axial electric drive further comprises a housing 1;

the stator 2, the deep groove ball bearing 25 and the rotor assembly are all fixedly arranged in the shell 1.

For the above embodiment, preferably, the end cover 11 is provided with a through hole 33, the end face of the housing 1 is provided with a threaded hole 32, the through hole 33 is coaxial with the threaded hole 32, and the bolt is matched with the threaded hole 32 through the through hole 33 to fix the whole motor. As shown in fig. 3.

For the above embodiment, it is preferred that an O-ring seal 6 is provided between the end cap 11 and the housing 1.

For the above embodiment, preferably, the housing 1 is provided with a motor position signal connector hole 45, one end of the motor position sensor connector 21 is connected with the circuit board 18, and the other end is inserted and connected to the pin of the motor position sensor 22, so that the installation is simple and convenient.

A power supply connector hole 44 is formed in the shell 1, one end of a power supply connector 17 is connected with the circuit board 18, the other end of the power supply connector is welded to a bus plate of the motor, no extra power line is arranged between the motor and the circuit board 18, wires and connectors at the other ends of the wires are reduced, and cost is reduced.

With the above embodiment, it is preferable that the screw nut 13 is engaged with the screw through the internal thread 38 thereof to constitute a ball screw pair.

For the above embodiment, preferably, the rotor shaft 4 is a hollow motor shaft.

For the above embodiment, preferably, a cage 10 is also provided within the annular ball race.

The utility model discloses integrated form heavy load axial electric drive arrangement adopts hollow motor as power pack, provides the rotation torque to convert the thrust of the big load of axial into through ball screw pair, cancelled the worm gear structure, adopt coaxial hollow motor and ball screw pair, product weight reduces, and driver silence effect is optimized, and whole car arranges the flexibility ratio and improves. The hollow motor is simple in structure, can be manufactured, packaged and transported independently, is low in manufacturing cost, is high in integration level of an assembled integrated large-load axial electric driving device, can be used as a shared part to derive multi-type products, and has wide market prospects.

The utility model discloses still disclose a hollow motor and controller integrated form heavy load axial installation method, including following step:

1) One end of the rotor shaft 4 is pressed into the screw nut 13, and the rod span a of the first annular steel ball raceway 37 is measured, as shown in fig. 4.

2) Setting the standard rod spanning distance to be A0, and setting the rod spanning distance difference delta A = A0-A between the rod spanning distance A of the first annular steel ball raceway 37 of the lead screw nut 13 and the rod spanning distance A0 of the standard lead screw nut 13 a;

3) Assembling the permanent magnet 3 to the rotor shaft 4, as shown in fig. 5;

4) The retainer ring 19 is fitted to the rotor shaft 4 so as to abut against the second step 43; then the wave spring 20 is assembled on the rotor shaft 4, and one end of the wave spring is abutted with the check ring 19; thereby forming a rotor shaft assembly 28, as shown in FIG. 6;

5) The deep groove ball bearing 25 is installed in the shell 1, as shown in fig. 7;

6) The stator 2 is installed in the housing 1, as shown in fig. 8;

7) The oil seal 5 is fitted into the end cap 11, as shown in fig. 9;

8) Acquiring an initial outer ring distance B; calculating to obtain a target thickness s according to the initial outer ring distance B and the difference value delta A of the cross-rod distance; selecting a corresponding adjusting shim 8 according to the target thickness s;

assembling the first outer ring 7, the second outer ring 9, the retainer 10 and the steel ball 14 to the lead screw nut 13 in advance, and measuring the distance between the first outer ring 7 and the second outer ring 9 at the moment as an initial outer ring distance B as shown in FIG. 10; thereby obtaining a target thickness s as the thickness of the adjusted adjusting shim 8;

s＝B-△A

the reasonable bearing clearance can be obtained through the step;

9) The rotor shaft assembly 28 penetrates through an inner hole of an end cover 11, the first outer ring 7 is placed in the end cover 11, then the retainer 10 is placed, then the steel ball 14 is placed in a steel ball hole of the retainer 10, and then the adjusted adjusting gasket 8 and the second outer ring 9 are sequentially placed; finally, the lock nut 12 is installed and a torque lock is applied to the lock nut 12. The O-ring 6 is fitted to the end cap 11. Forming the end cover 11 and rotor assembly 29. As shown in fig. 11;

10 The end cover 11 and the rotor assembly 29 are installed in the housing 1, and the end cover 11, the rotor assembly 29 and the housing 1 are fixed by the second bolt 31.

11 The motor position sensor 22 is assembled to the housing and fixed with the first bolt 24. As shown in fig. 13.

12 And the sensor target plate 23 is fitted to the rotor shaft 4, as shown in fig. 14.

13 Mounting the circuit board 18 to the housing 1, mounting the motor position sensor signal connector 21 to the sensor target plate 23; a motor position sensor signal connector 21 is fitted to the circuit board 18 at one end and inserted onto a pin of a motor position sensor 22 at the other end.

14 Power supply connector 17, one end of which is mounted on circuit board 18 and the other end of which is soldered to the motor bus pad. As shown in fig. 15.

15 The controller connector 15 is fitted to the controller cover 35, the controller cover 35 is fitted to the housing 1, and the mounting screws of the controller cover 35 are tightened as shown in fig. 16. And (5) finishing the assembly.

The above description is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or replacements within the technical scope of the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (8)

1. An integrated high-load axial electric drive device, characterized in that: comprises a stator component and a rotor component;

the stator component comprises a stator (2), and the stator (2) is sleeved outside the rotor component;

the rotor assembly includes a rotor assembly;

the rotor assembly comprises a rotor shaft assembly (28) and an outer ring bearing (41);

the rotor shaft assembly (28) comprises a rotor shaft (4) and a lead screw nut (13); one end of the rotor shaft (4) is fixedly connected with a screw nut (13); the rotor shaft (4) is provided with a permanent magnet (3); the stator (2) is positioned outside the permanent magnet (3);

the outer ring bearing (41) comprises a first outer ring (7), a second outer ring (9) and a steel ball (14); the first outer ring (7) and the second outer ring (9) are sleeved outside the screw nut (13); the first outer ring (7) and the second outer ring (9) are encircled on the lead screw nut (13) to form an annular steel ball raceway, and the steel ball (14) is arranged in the annular steel ball raceway.

2. An integrated high load axial electric drive as claimed in claim 1 wherein:

a first annular steel ball raceway (37) is arranged on the periphery of the lead screw nut (13), a second steel ball raceway (39) is arranged on the first outer ring (7), and a third steel ball raceway (40) is arranged on the second outer ring (9); the first annular steel ball rolling way (37), the second steel ball rolling way (39) and the third steel ball rolling way (40) jointly form an annular steel ball rolling way.

3. An integrated high load axial electric drive as claimed in claim 2 wherein: the electric drive further comprises an end cap (11);

the end cover (11) is arranged on the periphery of the lead screw nut (13);

the outer ring bearing (41) is positioned in the end cover (11);

a locking nut (12) is arranged on the outer side of the outer ring bearing (41), and the locking nut (12) is abutted against a second outer ring (9) in the outer ring bearing (41) after penetrating through a screw hole in the end cover (11); the second outer ring (9) and the first outer ring (7) are fixed on the inner side wall of the end cover (11) in sequence through a locking nut (12).

4. An integrated high load axial electric drive as claimed in claim 3 wherein:

an adjusting gasket (8) is arranged between the first outer ring (7) and the second outer ring (9).

5. An integrated high load axial electric drive as claimed in claim 4 wherein:

the periphery of one end of the rotor shaft (4) protrudes outwards to form a first step (42); the tail end of the rotor shaft (4) is connected with a screw nut (13) through a first step (42); the first step (42) is used for positioning the rotor shaft (4) and the lead screw nut (13) during assembly;

the periphery of the rotor shaft (4) is protruded outwards at a position which is spaced from the first step (42) by a certain distance to form a second step (43); the retainer ring (19) is sleeved on the rotor shaft (4) and is abutted against the second step (43); the second step (43) is used for limiting the axial movement of the retainer ring (19);

the rotor shaft (4) is provided with a permanent magnet (3) between a first step (42) and a second step (43);

the periphery of the rotor shaft (4) is provided with a deep groove ball bearing (25), and the wave spring (20) is arranged between the retainer ring (19) and the deep groove ball bearing (25); the wave spring (20) is used for eliminating the clearance between the deep groove ball bearing (25) and the outer ring bearing (41).

6. An integrated high load axial electric drive as claimed in claim 5 wherein: the electric drive further comprises a housing (1);

the stator (2), the deep groove ball bearing (25) and the rotor assembly are all arranged in the shell (1);

the end cover (11) is fixedly covered on the shell (1).

7. An integrated high load axial electric drive as claimed in claim 6 wherein:

a motor position signal connector hole (45) is formed in the shell (1), one end of a motor position sensor connector (21) is connected with the circuit board (18), and the other end of the motor position sensor connector is inserted and connected to a pin of a motor position sensor (22);

a power supply connector hole (44) is formed in the shell (1), one end of a power supply connector (17) is connected with the circuit board (18), and the other end of the power supply connector is welded to a bus disc of the motor.

8. An integrated high load axial electric drive as claimed in claim 1 wherein:

the rotor shaft (4) is in interference connection with the lead screw nut (13).

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