A direct-push vehicle liquid-cooled disc permanent magnet eddy current flexible retarder

Abstract

The present invention discloses a direct-push type vehicle-use liquid-cooled disc type permanent magnet eddy current flexible retarder, comprising: a guide optical axis, which is connected to a retarder frame arranged at intervals; a first stator and a second stator, which are respectively mounted on the guide optical axis and can move axially along the guide optical axis; a rotor, which is coaxially arranged between the first stator and the second stator; a direct-push arm, which is provided with a vertically inclined arc-shaped guide slot, and the direct-push arm can be supported on the retarder frame in a vertically sliding manner; the peripheries of the first stator and the second stator have protrusions, which are respectively accommodated in the arc-shaped guide slots; an actuator, which is connected to the direct-push arm; wherein, when the actuator drives the direct-push arm to move, it drives the first stator and the second stator to approach or move away from the rotor at the same time. The direct-push type vehicle-use liquid-cooled disc type permanent magnet eddy current flexible retarder provided by the present invention has a simple structure, requires a small driving force, is evenly stressed, and has good structural stability.

Description

Technical Field

[0001] The invention belongs to the technical field of automobile retarders, and in particular relates to a direct-push vehicle-used liquid-cooled disc permanent magnet eddy current flexible retarder. Background Art

[0002] The retarder is a safety auxiliary device for driving brakes. It applies braking force to the vehicle's transmission components to reduce the speed of the vehicle. The retarders commonly used at home and abroad are mainly hydraulic retarders and eddy current retarders. The hydraulic retarder has a complex structure, a long lag time for engagement and disengagement, and power loss when not working; the eddy current retarder has a better overall braking effect, but it also has the disadvantages of being large in size, heavy in body, consuming electricity, and being greatly affected by the ambient temperature. It is currently only suitable for large commercial vehicles. The permanent magnet retarder forms a magnetic field through its own permanent magnets to act as a retarder, so there is no power consumption.

[0003] Chinese patent application No. 201110437138.4 provides a radial array permanent magnet eddy current retarder, which uses a servo motor and a lead screw to drive two stators to move, but has low drive efficiency and high heat generation.

[0004] Chinese patent application No. 201710157665.7 provides a disc-type permanent magnet eddy current retarder for vehicles, which uses two stators arranged between two rotors, which resolves the axial resistance into axial rotation and axial movement, making operation more labor-saving. However, the use of two rotors results in a large space occupation, and a gap adjustment sheet is required between the rotor and the stator for gap adjustment, and the gap adjustability is poor. Summary of the invention

[0005] An object of the present invention is to solve the defects of the irrational stator and rotor arrangement and driving mode in the prior art, and to provide a disc-type permanent magnet eddy current retarder with uniform driving force and good stability.

[0006] Another object of the present invention is to overcome the defects of the permanent magnet eddy current retarder in the prior art, that is, the high heat generation and poor heat dissipation, and to provide a disc retarder with a water cooling device on the stator.

[0007] The technical solution provided by the present invention is:

[0008] A direct-push vehicle-use liquid-cooled disc permanent magnet eddy current flexible retarder, comprising:

[0009] A guide optical axis connected to the retarder frames arranged opposite to each other at intervals;

[0010] A first stator and a second stator, which are respectively mounted on the guide light axis and can move axially along the guide light axis;

[0011] a rotor coaxially disposed between the first stator and the second stator;

[0012] A straight push arm, which is provided with a vertically inclined arc-shaped guide slot, and the straight push arm can be vertically slidably supported on the retarder frame;

[0013] The peripheries of the first stator and the second stator have protrusions, which are respectively accommodated in the arc-shaped guide slots;

[0014] An actuator connected to the straight push arm;

[0015] When the actuator drives the push arm to move, the protrusion located in the guide slot drives the first stator and the second stator to move closer to or away from the rotor at the same time.

[0016] Preferably, the straight push arm is provided with two vertically inclined arc-shaped guide grooves, and the straight push arm is respectively arranged on both sides of the periphery of the first stator and the second stator.

[0017] Preferably, the retarder frame is provided with a vertical straight strip groove near the outer edge, and the two sides of the straight push arm have protrusions, which are located in the long strip groove, so that the straight push arm can slide along the long strip groove.

[0018] Preferably, the protrusion is a needle bearing, which is arranged in the elongated groove.

[0019] Preferably, a water cooling chamber is provided inside the stator, and a water inlet and a water outlet are provided on the stator.

[0020] Preferably, the rotor comprises:

[0021] A magnetic disk, which is disk-shaped, with a plurality of grooves symmetrically arranged on both sides of the magnetic disk;

[0022] A plurality of magnetic steels installed in the grooves;

[0023] A magnetic steel cover is matched and covered on the groove to fix the magnetic steel.

[0024] Preferably, the direct-push vehicle-use liquid-cooled disc permanent magnet eddy current flexible retarder further comprises a bearing support block fixedly connected to the retarder frame.

[0025] Preferably, the actuator is a cylinder, which is vertically fixedly mounted on the bearing support block, and the driving end of the cylinder is hinged to the straight push arm.

[0026] Preferably, there are two cylinders, which are symmetrically arranged on both sides of the stator.

[0027] Preferably, self-lubricating bearings are arranged in the guide holes opened at the four corners of the stator, and the guide optical axis cooperates with the self-lubricating bearings.

[0028] The beneficial effects of the present invention include:

[0029] 1. The permanent magnet eddy current flexible retarder overcomes the disadvantage of high power consumption of the eddy current retarder. The magnetic field is provided by high-performance NdFeB permanent magnets, and no power supply is required, thus saving power.

[0030] 2. Permanent magnets are installed on both sides of the rotor, which reduces the volume of the disc retarder structure, realizes synchronous and equal spacing adjustment of the double stators, obtains better symmetrical force, and improves efficiency and torque.

[0031] 3. Liquid cooling is used to consume the heat energy generated in a short period of time during braking, which greatly reduces the safety hazards caused by excessive temperature during braking.

[0032] 4. The stator is connected to the arc track of the push arm with a needle bearing, which provides convenient and accurate controllability for the gap adjustment between the rotor and the stator, and at the same time resolves the axial resistance into circumferential motion and axial movement, requiring less driving force and reducing heat generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a schematic diagram of the overall structure of the liquid-cooled disc permanent magnet eddy current flexible retarder described in the present invention.

[0034] Figure 2 This is a schematic diagram of the rotor decomposition structure of the present invention.

[0035] Figure 3 The figure is a schematic diagram of the assembly of the actuator of the direct-push vehicle liquid-cooled disc permanent magnet eddy current flexible retarder according to the present invention.

[0036] Figure 4 It is a schematic diagram of the decomposition of the actuator of the direct-push vehicle liquid-cooled disc permanent magnet eddy current flexible retarder described in the present invention.

[0037] Figure 5 This is a schematic diagram of the straight push arm structure of the present invention.

[0038] Figure 6 This is a schematic diagram of the decomposed structure of the stator according to the present invention.

[0039] Figure 7 This is a schematic diagram of the working principle of the liquid-cooled disc type permanent magnet eddy current flexible retarder described in the present invention.

[0040] Figure 8 It is a schematic diagram of the braking force formation of the direct-push vehicle liquid-cooled disc permanent magnet eddy current flexible retarder described in the present invention.

[0041] Fig. 9 It is a schematic diagram of force analysis of the direct push arms when the two stators of the present invention move away from the rotor. DETAILED DESCRIPTION

[0042] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0043] like Figure 1-5 As shown, the present invention provides a direct-push type vehicle-use liquid-cooled disc permanent magnet eddy current flexible retarder, which includes: a first stator 110, a guide light shaft 120, a second stator 130, a rotor 140, a direct-push arm 150, an actuator, a transition connecting frame 210, a retarder frame 220 and a bearing support block 230. The guide light shaft 120, both ends of which are fixedly connected to the retarder frame 220 arranged at intervals. The first stator 110 is an annular disc, and the first stator 110 is axially arranged on the guide light shaft 120; the second stator 130 has the same structure as the first stator 110, and is coaxially arranged on the guide light shaft 120 with the first stator 110. In this embodiment, there are four guide light axes 120, and the first stator 110 and the second stator 130 are respectively provided with guide holes 111 and guide holes 131 at four corners of the disk surface, and self-lubricating bearings are fixed in the four guide holes 111 and the four guide holes 131. The guide light axes 120 cooperate with the self-lubricating bearings to make the first stator and the second stator slide more smoothly.

[0044] The rotor 140 is an annular disk and is coaxially disposed between the first stator 110 and the second stator 130. Figure 2 As shown, a plurality of magnetic steel slots 142 are symmetrically provided on both sides of the disk surface 141 of the rotor 140 along the circumferential direction, and the number of the magnetic steel slots 142 is an even number. The magnetic steel slots 143 are installed in the magnetic steel slots 142, and the magnetic steel 143 is magnetized along the axial direction, and the working surface magnetic poles of two adjacent magnetic steels 143 are opposite, that is, the N pole and the S pole are arranged alternately. The rotor 140 is provided with a magnetic steel cover 144 on the outside of the magnetic steel 143, and the magnetic steel cover 144 is fixed to the disk surface 141 of the rotor 140 by screws, and the magnetic steel 143 is fixed between the disk surface 141 and the magnetic steel cover 144. The magnetic steel cover 144 is made of aluminum, which is light in weight and has good heat dissipation. The rotor 140 is connected to the output shaft of the gearbox and rotates synchronously with the output shaft of the gearbox.

[0045] The direct-push type vehicle liquid-cooled disc permanent magnet eddy current flexible retarder provided by the present invention also includes an actuator, which is used to drive the first stator 110 and the second stator 130 to approach or move away from the rotor 140 synchronously. The driving end of the actuator is hinged with the direct-push arm 150; the direct-push arm 150 is provided with a vertically inclined arc-shaped guide slot 151, and the periphery of the first stator 110 and the second stator 130 respectively has a protrusion 112 and a protrusion 132, which are respectively accommodated in the arc-shaped guide slot 151; the vertical movement of the guide slot 151 can make the first stator 110 and the second stator 130 move axially along the guide optical axis 120; that is, when the actuator drives the direct-push arm 150 to move vertically, it drives the first stator 110 and the second stator 130 to approach or move away from the rotor 140 at the same time.

[0046] In this embodiment, two direct push arms 150 are provided, and the two direct push arms 150 are respectively arranged on both sides of the periphery of the first stator 110 and the second stator 130. There are two guide slots 151, and the two vertically inclined arc-shaped guide slots 151 have the same shape. As a preferred embodiment, the two guide slots 151 are symmetrical about the center line. When the direct push arm 150 moves in the vertical direction, the first stator 110 and the second stator 130 can simultaneously approach or move away from the rotor 140 along the guide optical axis 120 under the action of the guide slots 151. The protrusions 112 and the protrusions 132 respectively use needle bearings, and the needle bearings are fixedly installed on the side walls of the first stator 110 and the second stator 130 by screws. The needle bearings on the two stators are respectively arranged in the two guide slots 151, and the needle bearings cooperate with the guide slots 151 to reduce the resistance of the relative movement of the first stator 110 and the second stator 130 and the guide slots 151.

[0047] The retarder frame 220 is fixedly connected to the gearbox housing through the transition connecting frame 210. The first stator 110, the second stator 130, the rotor 140 and related components are all located inside the retarder frame 220. A plurality of bearing support blocks 230 are evenly arranged between the two retarder frames 220. The two ends of the bearing support blocks 230 are respectively fixedly connected to the two retarder frames 220. The two retarder frames 220 are provided with vertical linear long strip grooves 221 near the outer edges. Both sides of the straight push arm 150 have protrusions 152, and the protrusions 152 are slidably arranged in the long strip grooves 221. In this embodiment, the protrusions 152 are needle bearings, which are fixedly installed on the side of the straight push arm 150 by screws. When the actuator drives the straight push arm 150 to move along the long strip groove 221, the needle bearing 152 rotates to reduce the resistance of the relative movement between the straight push arm 150 and the long strip groove 221.

[0048] In this embodiment, there are four bearing support blocks 230, which are evenly arranged between the two retarder frames 220. The bearing support blocks 230 and the two retarder frames 220 are connected by positioning pins, and the connection between the bearing support blocks 230 and the two retarder frames 220 is close to the outer edge of the retarder frame 220. The actuator adopts a cylinder 160, which is fixedly connected to the bearing support block 230 through a base. There are two cylinders 160, and the piston rods of the cylinders 160 are hinged to the two straight push arms 150 respectively.

[0049] like Figure 6 As shown, the present invention provides a direct-push vehicle liquid-cooled disc permanent magnet eddy current flexible retarder, which is provided with a water-cooling heat dissipation device. A water-cooling cavity is provided inside the first stator 110 and the second stator 130. Taking the first stator 110 as an example, a groove water channel 114 is provided on the disc surface 113 of the stator, and a closed cover plate 115 is provided on the outer side of the disc surface, so that the groove water channel 114 between the closed cover plate 115 and the disc surface 113 forms a water-cooling cavity, and a water inlet 116 and a water outlet 117 connected to the water-cooling cavity are provided on the side wall of the disc surface 113. The water inlet 116 can be connected to the automobile engine water tank, and the cooling water in the automobile engine water tank enters the water-cooling cavity of the stator 110 from the water inlet 116. After the cooling water absorbs heat in the water-cooling cavity, it is discharged to the automobile engine water tank radiator through the water outlet 117. Through water circulation cooling, the stator temperature can be effectively reduced, the thermal decay can be reduced, the braking torque can be continuously provided, and the braking effect is better.

[0050] like Figure 7-9 As shown, the working principle of the present invention is as follows: when the automobile needs auxiliary braking, the electronic control system issues a command to control the actuator to drive the push arm 150 to move toward the direction of the end where the distance between the two guide slots 151 is larger, so that the first stator 110 and the second stator 130 move toward the direction close to the rotor 140 at the same time. When the two stators are close to the rotor, due to the rotation of the rotor, the two stators cut the magnetic lines of force generated on the two sides of the rotor respectively, and eddy currents are induced inside the stator. According to Lenz's law, the magnetic lines of force generated by the induced current on the moving conductor always resist the movement of the conductor, thereby generating a braking effect and preventing the rotor from rotating. As the two stators continue to approach the rotor, the gap between the rotor and the two stators continues to decrease, and the air gap magnetic field strength continues to increase. When the air gap is 3 mm, the air gap magnetic field strength reaches the maximum, the braking force reaches the maximum, and the braking torque reaches the maximum; in this way, the magnetic field generated by the eddy current and the magnetic field generated by the magnetic steel on the rotor interact with each other, fully consuming the kinetic energy of the automobile and achieving the purpose of deceleration; the large amount of heat generated is taken away by the cooling liquid.

[0051] The direct-push type liquid-cooled disc-type permanent magnet eddy current flexible retarder provided by the present invention has permanent magnets installed on both sides of the rotor, and two stators are arranged on both sides of the rotor, which effectively reduces the volume of the disc retarder structure relative to the disc retarder of the two rotors. A direct-push arm is used as a driving member, and the side walls of the two stators are slidably connected in the circular arc track of the direct-push arm. The stator slides according to the trajectory of the circular arc track, which provides convenient and accurate controllability for the gap adjustment between the rotor and the stator, and at the same time resolves the maximum axial resistance into circumferential motion and axial movement, requiring less driving force; and the direct-push arm is evenly stressed when moving relative to the stator, and the overall structural stability is good, while the heat generation is reduced. The present invention realizes the synchronous equal spacing adjustment of the double stators, obtains better symmetrical stress, and improves efficiency and torque. Liquid cooling is used to consume the heat energy generated in a short period of time during the braking process, which greatly reduces the safety hazards caused by excessive temperature during the braking process.

[0052] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A direct-push vehicle liquid-cooled disc permanent magnet eddy current flexible retarder, characterized in that: include: A guide optical axis connected to the retarder frames arranged opposite to each other at intervals; A first stator and a second stator, which are respectively mounted on the guide light axis and can move axially along the guide light axis; a rotor coaxially disposed between the first stator and the second stator; A straight push arm, which is provided with a vertically inclined arc-shaped guide slot, and the straight push arm can be vertically slidably supported on the retarder frame; The peripheries of the first stator and the second stator have protrusions, which are respectively accommodated in the arc-shaped guide slots; An actuator connected to the straight-thrust arm; When the actuator drives the push arm to move, the protrusion located in the guide slot drives the first stator and the second stator to approach or move away from the rotor at the same time; The straight push arm is provided with two vertically inclined arc-shaped guide slots, and the straight push arm is respectively arranged on both sides of the periphery of the first stator and the second stator; The retarder frame is provided with a vertical straight strip groove near the outer edge, and the two sides of the straight push arm have protrusions, which are located in the long strip groove, so that the straight push arm can slide along the long strip groove; The protrusion is a needle bearing, which is arranged in the elongated groove.

2. The direct-push vehicle liquid-cooled disc permanent magnet eddy current flexible retarder according to claim 1 is characterized in that: A water cooling cavity is arranged inside the stator, and a water inlet and a water outlet are arranged on the stator.

3. The direct-push vehicle liquid-cooled disc permanent magnet eddy current flexible retarder according to claim 2 is characterized in that: The rotor comprises: A magnetic disk, which is disk-shaped, with a plurality of grooves symmetrically arranged on both sides of the magnetic disk; A plurality of magnetic steels installed in the grooves; A magnetic steel cover is matched and covered on the groove to fix the magnetic steel.

4. The direct-push vehicle liquid-cooled disc permanent magnet eddy current flexible retarder according to claim 1 is characterized in that: Also includes: A load-bearing support block is fixedly connected to the retarder frame.

5. The direct-push vehicle liquid-cooled disc permanent magnet eddy current flexible retarder according to claim 4 is characterized in that: The actuator is a cylinder, which is vertically fixed on the bearing support block, and the driving end of the cylinder is hinged to the straight push arm.

6. The direct-push vehicle liquid-cooled disc permanent magnet eddy current flexible retarder according to claim 5 is characterized in that: There are two cylinders, which are symmetrically arranged on both sides of the stator.

7. The direct-push vehicle liquid-cooled disc permanent magnet eddy current flexible retarder according to claim 1 or 6, characterized in that: Self-lubricating bearings are arranged in the guide holes at the four corners of the stator, and the guide optical axis cooperates with the self-lubricating bearings.

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