Linear motor for automobile suspension system

Abstract

The utility model discloses a linear motor for an automobile suspension system, which belongs to the technical field of linear servo drive and comprises a main body part and a magnetic shaft part, and the main body part and the magnetic shaft part are connected with an upper suspension support and a lower suspension support. The magnetic shaft part is connected with the under-suspension support, the magnetic shaft part is installed in the main body part in a sliding mode, a sensor arranged on a vehicle detects the condition of a road where wheels run, a signal is fed back to the linear motor driver, the driver drives and adjusts the relative position of the magnetic shaft part and the main body part, and then automobile suspension is adjusted. The encoder is used for collecting position signals between the main body part and the magnetic shaft part and feeding back the position signals to the driver, and according to the technical scheme, servo control can be carried out, the suspension posture of an automobile can be actively adjusted, and the riding comfort is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of linear servo drive, and particularly relates to a linear motor for an automotive suspension system. Background Art

[0002] Automotive suspension is a structure arranged between the vehicle frame and the wheels. Its main function is to absorb the vibrations generated during vehicle driving, ensure stable contact between the wheels and the ground, and improve the riding comfort. Currently, the widely used suspension systems on the market are all passive suspension forms, which slow down vibrations by setting elastic elements such as springs. The vibration range that this form can handle is limited. There is also a part of the suspension system that recovers the vibration energy. Essentially, this form still belongs to passive energy absorption and can only slow down the vibration range and cannot achieve active suspension attitude adjustment. Based on this, the utility model proposes a linear motor for an automotive suspension system. Summary of the Invention

[0003] The purpose of the utility model is to actively adjust the suspension attitude through servo control and improve the shock absorption ability of the suspension.

[0004] For the above technical problems, the technical solution adopted by the utility model is: a linear motor for an automotive suspension system, which includes a main body part and a magnetic shaft part. The main body part and the magnetic shaft part are respectively connected to the upper suspension bracket and the lower suspension bracket. The main body part is connected to a driver. A sensor for detecting the road surface condition during vehicle driving is arranged on the vehicle. The sensor transmits the detection signal to the driver, and the driver controls the relative position of the main body part and the magnetic shaft part, thereby adjusting the attitude of the suspension.

[0005] Further, the magnetic shaft part includes a magnetic shaft inner cylinder, which is arranged as a hollow structure. An annular permanent magnet is arranged on the outer side of the magnetic shaft inner cylinder. Threaded structures are arranged at both ends of the magnetic shaft inner cylinder. The locking nut cooperates with the threaded structure on the magnetic shaft inner cylinder to axially fix the annular permanent magnet on the magnetic shaft inner cylinder. A magnetic shaft outer sleeve is sleeved outside the annular permanent magnet. Magnetic shaft end cover A and magnetic shaft end cover B are respectively installed on both sides of the magnetic shaft outer sleeve.

[0006] Further, stepped through holes are provided inside both the magnetic axis end cap A and the magnetic axis end cap B. A threaded structure that mates with the inner cylinder of the magnetic axis is provided on the inner wall of the first-stage through hole. The diameter of the second-stage through hole is not less than the inner diameter of the inner cylinder of the magnetic axis. The outer circular surfaces of the magnetic axis end cap A and the magnetic axis end cap B are in the form of two-stage stepped shafts. The diameter of the first-stage shaft diameter is equal to the inner diameter of the magnetic axis outer sleeve, and the diameter of the second-stage shaft diameter is equal to the outer diameter of the magnetic axis outer sleeve. Locking bosses A are provided on the end faces of the magnetic axis end cap A and the magnetic axis end cap B that are far from the magnetic axis outer sleeve. By rotating and clamping the locking boss A, the magnetic axis end cap A and the magnetic axis end cap B are tightened on the inner cylinder of the magnetic axis. A connecting screw tube A or a first connecting ring for connecting the magnetic axis part to the upper suspension bracket or the lower suspension bracket is provided on the magnetic axis end cap A.

[0007] Further, the main body part includes a shaft sleeve. The shaft sleeve is sleeved outside the magnetic axis outer sleeve. A three-phase coil winding is sleeved outside the shaft sleeve. Each coil winding has one pole or multiple poles. Each pole winding in each phase of the coil winding is arranged in sequence. A spacer is provided between adjacent windings. The winding directions of every two adjacent windings are opposite. An electric motor housing is sleeved outside the coil winding. An encoder for detecting the relative position between the magnetic axis part and the main body part is provided on the electric motor housing. Motor end caps A and B are provided at both ends of the electric motor housing.

[0008] Further, a kidney-shaped hole is provided on the motor end cap B. The kidney-shaped hole communicates with the inside of the motor housing. Resin is poured into the space between the motor housing and the coil winding through the kidney-shaped hole.

[0009] Further, the motor end cap A and the motor end cap B are in the form of hollow stepped shafts. A threaded structure for connecting to the motor housing is provided on the first-stage stepped shaft. At this time, internal threads are provided on the inner sides at both ends of the motor housing. The diameter of the second-stage stepped shaft is equal to the diameter of the motor housing. A plurality of mounting holes for tightening the motor end cap A are provided in a circle on the end face of the motor end cap A. A locking boss B for tightening the motor end cap B is provided on the motor end cap B. At this time, the leads of the coil winding are led out through the side wall of the motor housing.

[0010] Further, the motor end cap A and the motor end cap B are in the form of hollow stepped shafts. The diameter of the first-stage stepped shaft is equal to the inner diameter of the motor housing, and the diameter of the second-stage stepped shaft is equal to the outer diameter of the motor housing. A plurality of threaded holes are provided on the circumferences of the motor end cap A and the motor end cap B. Through holes corresponding to the threaded holes are provided on the motor housing. The motor end cap A and the motor end cap B are connected to the motor housing by screws. At this time, the connection line of the encoder and the lead of the coil winding are led out through the kidney-shaped hole.

[0011] Further, a connecting screw tube B or a second connecting ring for connecting to the upper suspension bracket is provided on the motor end cap B.

[0012] Further, a first retaining ring is fixedly installed on the outer side of the outer sleeve of the magnetic axis in the magnetic axis part, and a second retaining ring is fixedly installed on the outer side of the motor housing of the main body part. A spring coaxial with the main body part and the magnetic axis part is arranged between the first retaining ring and the second retaining ring.

[0013] Further, a damper device is arranged between the main body part and the magnetic axis part. The damper device includes a gas spring. The gas spring includes a pressure cylinder and a piston rod. The pressure cylinder is arranged inside the magnetic axis part, and the piston rod is arranged inside the main body part. Relative movement occurs between the pressure cylinder and the piston rod.

[0014] The beneficial effects of the present utility model compared with the prior art are as follows: (1) The present utility model realizes the active control of the suspension through the servo control of the magnetic axis part and the motor part, enabling it to adjust the suspension attitude in real time according to the road conditions and improving the riding comfort; (2) The suspension system proposed by the present utility model has a compact structure. Based on the structure design of the traditional suspension, it can be applied to the space environment inside the vehicle without increasing the overall volume of the suspension; (3) The technical solution of the present utility model is provided with a damper device between the magnetic axis part and the motor part, which can support the suspension when the motor is not enabled. It is arranged inside the motor with a clever structure and is applicable to various usage scenarios. Description of the Drawings

[0015] Figure 1 It is a schematic structural diagram (first perspective) of the magnetic axis part and the main body part of the first embodiment of the present utility model.

[0016] Figure 2 It is a schematic structural diagram (second perspective) of the magnetic axis part and the main body part of the first embodiment of the present utility model.

[0017] Figure 3 It is a schematic structural diagram of the magnetic axis part of the present utility model.

[0018] Figure 4 It is a schematic internal structural diagram of the magnetic axis part of the present utility model.

[0019] Figure 5 It is a schematic structural diagram (first perspective) of the main body part of the present utility model.

[0020] Figure 6 It is a schematic structural diagram (second perspective) of the main body part of the present utility model.

[0021] Figure 7 It is a schematic internal structural diagram of the main body part of the present utility model.

[0022] Figure 8This is a schematic structural diagram of the magnetic shaft part and the main body part of the second embodiment of the present utility model.

[0023] Figure 9 This is a schematic overall structural diagram of one of the suspension systems of the present utility model.

[0024] Figure 10 For Figure 9 Cross-sectional view.

[0025] Figure 11 This is a cross-sectional structural view of the present utility model after being configured with another damper device.

[0026] Reference numerals in the drawings: 101 - magnetic shaft outer sleeve; 102 - magnetic shaft end cover A; 103 - locking boss A; 104 - connecting screw tube A; 105 - magnetic shaft end cover B; 106 - magnetic shaft inner cylinder; 107 - locking nut; 108 - annular permanent magnet; 109 - first connecting ring; 110 - first retaining ring; 201 - motor housing; 202 - motor end cover A; 203 - encoder; 204 - mounting hole; 205 - threaded hole; 206 - motor end cover B; 207 - kidney-shaped hole; 208 - locking boss B; 209 - connecting screw tube B; 210 - shaft sleeve; 211 - coil winding; 212 - spacer; 213 - second connecting ring; 214 - second retaining ring; 3 - spring; 401 - pressure cylinder; 402 - piston rod. Specific embodiments

[0027] The following further describes the specific embodiments of the present utility model with reference to the accompanying drawings.

[0028] Embodiment: Referring to Figures 1 - 10 , a linear motor for an automotive suspension system includes a main body part and a magnetic shaft part. The main body part and the magnetic shaft part, the main body part, the magnetic shaft part are connected to the upper suspension bracket and the lower suspension bracket. The upper suspension bracket is connected to the vehicle body, and the lower suspension bracket is connected to the wheel. In this embodiment, the main body part is connected to the upper suspension bracket, the magnetic shaft part is connected to the lower suspension bracket, and the magnetic shaft part is slidably installed inside the main body part.

[0029] The magnetic axis part includes a magnetic axis inner cylinder 106, on which one or more annular permanent magnets 108 are sleeved. When there are multiple annular permanent magnets 108, the same magnetic poles between two adjacent annular permanent magnets 108 are installed close to each other. Threaded structures are provided at both ends of the magnetic axis inner cylinder 106. Locking nuts 107 are provided on both sides of the annular permanent magnet 108. The locking nuts 107 achieve the axial fixation of the annular permanent magnet 108 on the magnetic axis inner cylinder 106 through thread fitting with the magnetic axis inner cylinder 106. A magnetic axis outer sleeve 101 is sleeved outside the annular permanent magnet 108. Magnetic axis end caps A 102 and magnetic axis end caps B 105 are respectively provided at both ends of the magnetic axis outer sleeve 101. Both the magnetic axis end caps A 102 and magnetic axis end caps B 105 are in the form of two-stage stepped shafts. The diameter of the first-stage stepped shaft is equal to the inner diameter of the magnetic axis outer sleeve 101, and the diameter of the second-stage stepped shaft is equal to the outer diameter of the magnetic axis outer sleeve 101. The magnetic axis end caps A 102 and magnetic axis end caps B 105 respectively form thread fitting with both ends of the magnetic axis inner cylinder 106. Locking bosses A 103 are respectively provided on the magnetic axis end caps A 102 and magnetic axis end caps B 105. During installation, the magnetic axis end caps A 102 and magnetic axis end caps B 105 are tightened on the magnetic axis inner cylinder 106 by rotating and clamping the locking bosses A 103. The magnetic axis inner cylinder 106 is set as a hollow structure, and the interiors of the magnetic axis end caps A 102 and magnetic axis end caps B 105 are also set as hollow structures. Two-stage stepped holes are provided inside the magnetic axis end caps A 102 and magnetic axis end caps B 105. The diameter of the first-stage stepped hole is the same as the outer diameter of the magnetic axis inner cylinder 106, and the diameter of the second-stage stepped hole is the same as the inner diameter of the magnetic axis inner cylinder 106. A connecting screw tube A 104 coaxial with the locking boss A 103 and the magnetic axis end cap A 102 is provided at the end of the locking boss A 103. The connecting screw tube A 104 is used to achieve the connection between the magnetic axis part and the suspension bracket. The inner hole diameters of the locking boss A 103 and the connecting screw tube A 104 are equal to the diameter of the second-stage stepped hole on the magnetic axis end cap A 102. The connecting screw tube A 104 can be replaced by a first connecting ring 109, and the first connecting ring 109 is also used to achieve the connection between the magnetic axis part and the suspension bracket.

[0030] The main body part includes a bushing 210. In this embodiment, the bushing 210 is an engineering plastic bearing. A three-phase coil winding 211 is wound around the bushing 210. Each phase of the coil winding 211 has one or more poles. Each pole of the three-phase coil winding 211 is arranged in sequence and interspersed on the bushing 210. A spacer 212 is provided between each pole winding coil. An electric machine housing 201 is provided outside the coil winding 211. Motor end covers A 202 and motor end cover B 206 are installed at both ends of the electric machine housing 201. Both ends of the bushing 210 are respectively inserted into the inside of the motor end cover A 202 and the motor end cover B 206. A kidney-shaped hole 207 is provided on the motor end cover B 206. The kidney-shaped hole 207 communicates with the inside of the electric machine housing 201. Resin is poured into the inside of the electric machine housing 201 through the kidney-shaped hole 207. An encoder 203 is provided on the electric machine housing 201. The encoder 203 is used to detect the magnetic field of the magnetic shaft part, and further detect the relative position between the magnetic shaft part and the main body part. In this embodiment, two connection methods between the motor end cover A 202 and the motor end cover B 206 and the electric machine housing 201 are given. One: The motor end cover A 202 and the electric machine housing 201 are connected by threads. At this time, a plurality of mounting holes 204 need to be machined evenly in the circumferential direction on the end face of the motor end cover A 202. At the same time, a locking boss B 208 is machined on the motor end cover B 206. The mounting holes 204 and the locking boss B 208 are used to tighten the motor end cover A 202 and the motor end cover B 206. Two: The motor end cover A 202, the motor end cover B 206 and the electric machine housing 201 are connected by screws. At this time, threaded holes 205 need to be machined on the outer circumferential surfaces of the motor end cover A 202 and the motor end cover B 206. At this time, through holes that fit the threaded holes 205 need to be machined on the electric machine housing 201. The mounting holes 204 and the locking boss B 208 are not designed and machined at the same time as the threaded holes 205.

[0031] When the motor end cover A 202 and the motor end cover B 206 are connected to the electric machine housing 201 by screws, the connecting wire of the encoder 203 and the power supply wire of the coil winding 211 are simultaneously led out through the kidney-shaped hole 207. When the motor end cover A 202 and the motor end cover B 206 are connected to the electric machine housing 201 by threads, the connecting wire of the encoder 203 and the power supply wire of the coil winding 211 are led out by drilling holes on the electric machine housing 201. If the locking boss B 208 is not machined, at this time, the connecting screw tube B 209 is directly provided on the motor end cover B 206. The connecting screw tube B 209 is used to connect to the suspension bracket. The connecting screw tube B 209 can be replaced by the form of a second connecting ring 213. The second connecting ring 213 is used to connect the main body part and the suspension bracket.

[0032] A first retaining ring 110 is provided outside the magnetic shaft outer sleeve 101. A second retaining ring 214 is provided outside the electric machine housing 201. A spring 3 coaxial with the magnetic shaft outer sleeve 101 and the electric machine housing 201 is provided between the first retaining ring 110 and the second retaining ring 214. The spring 3 plays a role in auxiliary support and shock absorption.

[0033] In some embodiments, a damper device is further provided between the main body portion and the magnetic axis portion. The damper device includes a gas spring. As Figure 11 shown, the gas spring includes a pressure cylinder 401 and a piston rod 402. The pressure cylinder 401 is disposed inside the magnetic axis portion, and the piston rod 402 is disposed inside the main body portion. Relative movement occurs between the pressure cylinder 401 and the piston rod 402. The function of the damper device is to support the vehicle suspension.

[0034] During use, the road surface conditions passed by the wheels are detected by sensors provided on the vehicle, and the signals are fed back to the linear motor driver. The driver drives to adjust the relative position between the magnetic axis portion and the main body portion, thereby adjusting the vehicle suspension and improving the riding comfort. The function of the encoder 203 is to collect the position signals between the main body portion and the magnetic axis portion and feed them back to the driver. In the case where the linear motor is not enabled, the vehicle suspension can be supported by the provided spring or other damper devices.

Claims

1. A linear motor for an automobile suspension system, characterized in that: It includes a main body part and a magnetic axis part, wherein the main body part and the magnetic axis part are respectively connected to the upper suspension bracket and the lower suspension bracket, and the main body part is connected to the driver. The car is provided with a sensor for detecting the road conditions on which the vehicle is traveling. The sensor transmits the detection signal to the driver, and the driver controls the relative position of the main body part and the magnetic axis part, thereby adjusting the posture of the suspension.

2. A linear motor for a vehicle suspension system according to claim 1, characterized in that: The magnetic axis portion comprises a magnetic axis inner cylinder (106), the magnetic axis inner cylinder (106) being configured as a hollow structure, an annular magnetic steel (108) being disposed on the outer side of the magnetic axis inner cylinder (106), threaded structures being disposed on both ends of the magnetic axis inner cylinder (106), a locking nut (107) cooperating with the threaded structure on the magnetic axis inner cylinder (106) to achieve axial fixation of the annular magnetic steel (108) on the magnetic axis inner cylinder (106), a magnetic axis outer sleeve (101) being disposed on the outer side of the annular magnetic steel (108), and a magnetic axis end cover A (102) and a magnetic axis end cover B (105) being respectively mounted on both sides of the magnetic axis outer sleeve (101).

3. A linear motor for a vehicle suspension system according to claim 2, characterized in that: The magnetic shaft end cap A (102) and the magnetic shaft end cap B (105) are both provided with stepped through holes inside, the inner wall of the first section of the through hole is provided with a threaded structure that cooperates with the magnetic shaft inner cylinder (106), the diameter of the second section of the through hole is not less than the inner diameter of the magnetic shaft inner cylinder (106), the outer cylindrical surface of the magnetic shaft end cap A (102) and the magnetic shaft end cap B (105) is provided in the form of two sections of stepped shafts, the diameter of the first section of the shaft diameter is equal to the inner diameter of the magnetic shaft outer sleeve (101), and the diameter of the second section of the shaft diameter is equal to the inner diameter of the magnetic shaft outer sleeve (101). The outer diameters are equal, and locking bosses A (103) are provided on the end surfaces of the magnetic shaft end covers A (102) and the magnetic shaft end covers B (105) away from the magnetic shaft outer sleeve (101). The magnetic shaft end covers A (102) and the magnetic shaft end covers B (105) are tightened on the magnetic shaft inner cylinder (106) by clamping and rotating the locking bosses A (103). The magnetic shaft end covers A (102) are provided with connecting spiral tubes A (104) or first connecting rings (109) for connecting the magnetic shaft part with the upper suspension bracket or the lower suspension bracket.

4. The linear motor for a vehicle suspension system according to claim 1, characterized in that: The main body part comprises a shaft sleeve (210), the shaft sleeve (210) being sleeved on the outside of the magnetic shaft sleeve (101), a three-phase coil winding (211) being sleeved on the outside of the shaft sleeve (210), each coil winding (211) being provided with one pole or multiple poles, each pole winding in each phase coil winding (211) being arranged in sequence, a spacer (212) being provided between adjacent windings, and the rotation directions of every two adjacent windings being opposite, a motor housing (201) being sleeved on the outside of the coil winding (211), an encoder (203) for detecting the relative position between the magnetic shaft part and the main body part being provided on the motor housing (201), and a motor end cover A (202) and a motor end cover B (206) being provided at both ends of the motor housing (201).

5. A linear motor for a vehicle suspension system according to claim 4, characterized in that: The motor end cover B (206) is provided with a waist-shaped hole (207), the waist-shaped hole (207) is communicated with the inside of the motor housing (201), and resin is poured between the motor housing (201) and the coil winding (211) through the waist-shaped hole (207).

6. A linear motor for a vehicle suspension system according to claim 5, characterized in that: The motor end cover A (202) and the motor end cover B (206) are arranged in the form of a hollow stepped shaft, a threaded structure connected to the motor housing (201) is arranged on the first section of the stepped shaft, and internal threads are arranged on the inner sides of both ends of the motor housing (201), and the diameter of the second section of the stepped shaft is equal to the diameter of the motor housing (201), and a plurality of mounting holes (204) for tightening the motor end cover A (202) are arranged on the circumference of the end surface of the motor end cover A (202), and a locking boss B (208) for tightening the motor end cover B (206) is arranged on the motor end cover B (206), and the lead wire of the coil winding (211) is led out through the side wall of the motor housing (201).

7. The linear motor for a vehicle suspension system according to claim 5, characterized in that: The motor end cover A (202) and the motor end cover B (206) are configured in the form of a hollow stepped shaft, the diameter of the first section of the stepped shaft is equal to the inner diameter of the motor housing (201), the diameter of the second section of the stepped shaft is equal to the outer diameter of the motor housing (201), a plurality of threaded holes (205) are provided on the circumference of the motor end cover A (202) and the motor end cover B (206), the motor housing (201) is provided with through holes corresponding to the threaded holes (205), the motor end cover A (202) and the motor end cover B (206) are connected to the motor housing (201) by screws, and at this time, the connecting wire of the encoder (203) and the lead wire of the coil winding (211) are led out through the waist-shaped hole (207).

8. A linear motor for a vehicle suspension system according to claim 6 or 7, characterized in that: The motor end cover B (206) is provided with a connecting screw tube B (209) or a second connecting ring (213) for connecting to the upper suspension bracket.

9. The linear motor for a vehicle suspension system according to claim 1, characterized in that: A first retaining ring (110) is fixedly mounted on the outer side of a magnetic shaft jacket (101) in the magnetic shaft portion, and a second retaining ring (214) is fixedly mounted on the outer side of a motor housing (201) in the main body portion. A spring (3) coaxial with the main body portion and the magnetic shaft portion is arranged between the first retaining ring (110) and the second retaining ring (214).

10. The linear motor for a vehicle suspension system according to claim 1, characterized in that: A damper device is arranged between the main body part and the magnetic axis part, the damper device comprises a gas spring, the gas spring comprises a pressure cylinder (401) and a piston rod (402), the pressure cylinder (401) is arranged inside the magnetic axis part, the piston rod (402) is arranged inside the main body part, and relative movement is generated between the pressure cylinder (401) and the piston rod (402).

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