An electromagnetic intermediate shaft brake

Abstract

The utility model provides an electromagnetic intermediate shaft brake to solve the technical problems of the existing mechanical automatic transmission gearbox, such as high cost, complex structure, large space occupation and difficulty in accurate control of the braking process. The utility model comprises a brake assembly housing, a brake electromagnet core, a brake pressure disc, a brake component and a reset component; the brake electromagnet core, the brake pressure disc and the reset component are all located in the brake cavity; the brake pressure disc is coaxially arranged between the brake assembly housing and the brake electromagnet core, the brake electromagnet coil and the brake release electromagnet coil are respectively electrically connected to the external gearbox controller, the brake electromagnet coil is energized to make the brake ring drive the brake pressure disc to move toward the brake electromagnet core, and generate braking force through the brake component, or the brake release electromagnet coil is energized to make the brake ring drive the brake pressure disc to move toward the brake assembly housing to release the braking force; after the braking force is released, the reset component realizes the reset of the brake pressure disc and the brake component.

Description

Technical Field

[0001] The utility model relates to an automatic gearbox, in particular to an electromagnetic intermediate shaft brake. Background Art

[0002] Mechanical automatic transmissions mainly use a sliding sleeve mechanism to shift gears. When shifting up, an intermediate shaft brake is required to reduce the input shaft speed to a reasonable range so that the gears can engage smoothly and shift gears can be achieved.

[0003] Existing AMT (Automated Mechanical Transmission) actuators can be divided into three categories according to different power sources. The first category is hydraulic actuators, which have fast response speed, but the hydraulic components have high requirements for processing accuracy and sealing performance, and their cost is also high; the second category is electric actuators, which have high transmission efficiency and low energy loss, but have complex structures, occupy large spaces, and are not conducive to vehicle layout; the third category is pneumatic actuators, which have general requirements for component processing accuracy and low cost, but the braking process is not easy to accurately control due to the compressibility of gas.

[0004] In summary, the existing mechanical automatic transmission has the problems of high cost, complex structure, large space occupation and difficulty in precise control of the braking process. Utility Model Content

[0005] The utility model aims to solve the technical problems of the existing mechanical automatic gearbox, such as high cost, complex structure, large space occupation and difficulty in accurate control of the braking process, and provides an electromagnetic intermediate shaft brake.

[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0007] An electromagnetic intermediate shaft brake is special in that it comprises a brake assembly housing, a brake electromagnet core, a brake pressure disc, a brake assembly and a reset assembly;

[0008] One end of the intermediate shaft is arranged on the gearbox housing through a bearing and extends out of the gearbox housing;

[0009] The brake assembly housing is fixed on the gearbox housing, and the brake assembly housing is coaxially arranged with the intermediate shaft, and a brake cavity is formed between the brake assembly housing and the gearbox housing; the brake electromagnet core, the brake pressure disc and the reset assembly are all located in the brake cavity;

[0010] The brake electromagnet core is coaxially sleeved on one end of the intermediate shaft extending into the brake cavity, and the brake electromagnet core is connected to the gearbox housing; the brake assembly is arranged on the inner ring of the brake electromagnet core and sleeved on the intermediate shaft; the outer ring of the brake electromagnet core is provided with a brake electromagnet coil; the inner wall of the brake assembly housing is provided with a brake release electromagnet coil at a position corresponding to the brake electromagnet coil along the axial direction;

[0011] The brake pressure disc is coaxially arranged between the brake assembly housing and the brake electromagnet core; a brake ring is sleeved on the brake pressure disc, and the brake ring is located between the brake electromagnet coil and the brake release electromagnet coil;

[0012] The brake electromagnet coil and the brake release electromagnet coil are respectively electrically connected to the external gearbox controller, and are used to energize the brake electromagnet coil so that the brake ring drives the brake pressure plate to move toward the brake electromagnet core and generate braking force through the brake assembly, or energize the brake release electromagnet coil so that the brake ring drives the brake pressure plate to move toward the brake assembly housing to release the braking force;

[0013] The reset assembly is arranged between the end of the intermediate shaft and the brake pressure disc, and is used to reset the brake pressure disc and the brake assembly after the braking force is released.

[0014] Furthermore, the brake pressure disc is a π-shaped brake pad with a hollow cylindrical shape and an opening toward the intermediate shaft; a connecting cylinder with an opening toward the intermediate shaft is sleeved on the outer side of the π-shaped brake pad, and a brake ring is sleeved on the open end of the connecting cylinder;

[0015] The inner wall of the brake assembly housing is provided with a first cylindrical cavity adapted to the outer diameter of the π-shaped brake pad and a second cylindrical cavity adapted to the outer diameter of the connecting cylinder in sequence;

[0016] One end of the π-shaped brake pad away from the opening is sleeved in the first cylindrical cavity through a support ring, and the connecting cylinder is located in the second cylindrical cavity;

[0017] The end of the π-shaped brake pad close to the intermediate shaft is used to cooperate with the brake assembly during braking;

[0018] A positioning protrusion is provided at the bottom of the cylinder of the π-shaped brake pad, which is used to cooperate with the reset component when the brake is released;

[0019] The brake release electromagnet coil is arranged between the second cylindrical cavity and the brake assembly housing.

[0020] Further, the reset assembly includes a top cap and a reset spring;

[0021] A first groove matching the top cap is provided at one end of the intermediate shaft;

[0022] One end of the top cap abuts against the positioning protrusion, the other end is located in the first groove, and the other end is provided with a second groove;

[0023] One end of the return spring abuts against the bottom of the first groove, and the other end abuts against the bottom of the second groove.

[0024] Further, the brake assembly includes a plurality of dual steel plates and a plurality of friction plates, and the plurality of dual steel plates and the plurality of friction plates are arranged at intervals;

[0025] The friction plate is arranged on the intermediate shaft through a spline; the dual steel plate is connected to the inner ring of the brake electromagnet core.

[0026] Furthermore, an outer diameter of the top cap is clearance-matched with an inner wall of a first groove at one end of the intermediate shaft.

[0027] Furthermore, an electromagnet control switch is provided on the brake assembly housing;

[0028] The brake electromagnet coil and the brake release electromagnet coil are electrically connected to an external gearbox controller through an electromagnet control switch respectively.

[0029] Furthermore, the number of the friction plates is at least 2;

[0030] The number of paired steel sheets is at least 3.

[0031] Furthermore, the braking electromagnet coil and the releasing braking electromagnet coil are wound in the same manner.

[0032] Beneficial effects of the utility model:

[0033] 1. The utility model discloses an electromagnetic intermediate shaft brake. Compared with the existing electronically controlled mechanical automatic transmission, the utility model saves a gas pipe between the electromagnetic valve and the cylinder head in the original structure TB (Transmision Brake intermediate shaft brake assembly); adopts a brake electromagnetic iron core, a brake pressure plate, a brake electromagnetic iron coil and a brake release electromagnetic iron coil group to work by energizing, saves the gas path between the brake cylinder and the electromagnetic valve, reduces the production cost of the transmission housing, and is easy to accurately control.

[0034] 2. The utility model is an electromagnetic intermediate shaft brake, which is composed of a brake electromagnet core, a brake pressure plate, a brake electromagnet coil and a brake release electromagnet coil. By energizing the brake electromagnet coil and the brake release electromagnet coil, the brake pressure plate is attracted to generate a braking force. The braking effect is accurate and reliable, and the structure is compact and occupies little space. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of an electromagnetic intermediate shaft brake embodiment of the utility model;

[0036] Figure 2 It is a structural schematic diagram of a brake pressure disc in an embodiment of an electromagnetic intermediate shaft brake of the utility model;

[0037] Figure 3 It is a structural schematic diagram of a brake assembly housing in an embodiment of an electromagnetic intermediate shaft brake of the utility model;

[0038] Figure 4 The utility model is a three-dimensional structural schematic diagram of a brake assembly housing in an electromagnetic intermediate shaft brake embodiment.

[0039] Description of reference numerals:

[0040] 1-intermediate shaft, 2-gearbox housing, 3-bearing, 4-friction plate, 5-dual steel plate, 6-brake electromagnet core, 7-brake electromagnet coil, 8-brake pressure plate, 81-brake ring, 83-connecting cylinder, 84-π-shaped brake plate, 85-positioning protrusion, 9-support ring, 10-top cap, 11-reset spring, 12-brake release electromagnet coil, 13-brake assembly housing, 131-first cylindrical cavity, 132-second cylindrical cavity. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0042] like Figure 1 As shown, an electromagnetic intermediate shaft brake includes a brake assembly housing 13, a brake electromagnet core 6, a brake pressure plate 8 and a reset component; the brake component includes two friction plates 4 and three pairs of steel plates 5; the reset component includes a top cap 10 and a reset spring 11.

[0043] One end of the intermediate shaft 1 is coaxially sleeved on the gearbox housing 2 through the bearing 3 and extends out of the gearbox housing 2; the brake assembly housing 13 is fixed on the gearbox housing 2, and the brake assembly housing 13 is coaxially arranged with the intermediate shaft 1, and a brake cavity is formed between the brake assembly housing 13 and the gearbox housing 2; the brake electromagnet core 6, the brake pressure plate 8 and the reset assembly are all located in the brake cavity; the brake electromagnet core 6 is coaxially sleeved on the outer wall of one end of the intermediate shaft 1 extending into the brake cavity, and the brake electromagnet core 6 is connected to the gearbox housing 2, the brake assembly is arranged on the inner ring of the brake electromagnet core 6, and is sleeved on the intermediate shaft 1, and the outer ring is provided with a brake electromagnet coil 7; a brake release electromagnet coil 12 is provided at a position of the inner wall of the brake assembly housing 13 corresponding to the brake electromagnet coil 7, and an electromagnet control switch is provided on the brake assembly housing 13.

[0044] The brake pressure disc 8 is coaxially arranged between the brake assembly housing 13 and the brake electromagnet core 6; a brake ring 81 is sleeved on the brake pressure disc 8, and the brake ring 81 is located between the brake electromagnet coil 7 and the brake release electromagnet coil 12.

[0045] The brake electromagnet coil 7 and the brake release electromagnet coil 12 are electrically connected to the external gearbox controller through the electromagnet control switch respectively, and are used to energize the brake electromagnet coil 7 so that the brake ring 81 drives the brake pressure plate 8 to move toward the brake electromagnet core 6 and generate braking force through the brake assembly, or energize the brake release electromagnet coil 12 so that the brake ring 81 drives the brake pressure plate 8 to move toward the brake assembly housing 13 to release the braking force.

[0046] The reset assembly is arranged between one end of the intermediate shaft 1 and the brake pressure disc 8, and is used to reset the brake pressure disc 8 and the brake assembly after the braking force is released.

[0047] like Figure 2 , Figure 3 , Figure 4 As shown, the brake pressure disc 8 is a π-shaped brake pad 84 with a hollow cylindrical shape and an opening toward the intermediate shaft 1; the outer side of the π-shaped brake pad 84 is sleeved with a connecting cylinder 83 with an opening toward the intermediate shaft 1, and the brake ring 81 is sleeved on the open end of the connecting cylinder 83; the inner wall of the brake assembly housing 13 is sequentially provided with a first cylindrical cavity 131 adapted to the outer diameter of the π-shaped brake pad 84 and a second cylindrical cavity 132 adapted to the outer diameter of the connecting cylinder 83; the end of the π-shaped brake pad 84 away from the opening is sleeved in the first cylindrical cavity 131 through the support ring 9, and the connecting cylinder 83 is located in the second cylindrical cavity 132; the end of the π-shaped brake pad 84 close to the intermediate shaft 1 is used to cooperate with the brake assembly during braking; the bottom of the cylinder of the π-shaped brake pad 84 is provided with a positioning protrusion 85, which is used to cooperate with the reset assembly when the brake is released; the brake release electromagnet coil 12 is arranged between the second cylindrical cavity 132 and the brake assembly housing 13.

[0048] A first groove matching with the top cap 10 is provided at one end of the intermediate shaft 1; one end of the top cap 10 abuts against the positioning protrusion 85, and the other end is sleeved in the first groove, and the other end is provided with a second groove; one end of the return spring 11 abuts against the bottom of the first groove, and the other end abuts against the bottom of the second groove, so as to maintain the appropriate position of the brake pressure plate 8 when the brake electromagnet coil 7 is powered off, thereby ensuring that the intermediate shaft is released from the brake.

[0049] Preferably, the outer diameter of the top cap 10 is clearance-matched with the inner wall of the first groove at one end of the intermediate shaft 1, thereby avoiding relative movement between the top cap 10 and one end of the intermediate shaft 1. The friction plate 4 and the dual steel plate 5 are arranged at intervals, and two friction plates 4 are arranged on the intermediate shaft 1 through splines, and three dual steel plates 5 are connected to the inner ring of the brake electromagnet core 6. The bearing 3 is a cylindrical stick bearing. The edge of the brake assembly housing 13 and the edge of the brake electromagnet core 6 are both connected to the gearbox housing 2. The winding method of the brake electromagnet coil 7 and the release brake electromagnet coil 12 is the same, so that the magnetic circuit of the brake pressure plate 8 always extends in one direction when working.

[0050] The use process of the electromagnetic intermediate shaft brake of the utility model is as follows:

[0051] When shifting gears, the transmission controller TCU (Transmision Control Unit) is connected to the brake electromagnet coil 7 and the release brake electromagnet coil 12 respectively through the electromagnet control switch.

[0052] When the transmission controller TCU energizes the brake electromagnet coil 7 through the electromagnet control switch, the brake electromagnet core 6 attracts the brake pressure plate 8 to move in the direction of the brake electromagnet core 6, and then the π-shaped brake pad 84 on the brake pressure plate 8 presses the friction plate 4 through the dual steel plate 5 to generate braking force, so that the intermediate shaft 1 starts to slow down;

[0053] When the braking effect of the intermediate shaft 1 reaches the target speed, the transmission controller TCU cuts off the power to the brake electromagnet coil 7 through the electromagnet control switch, and then re-energizes the brake release electromagnet coil 12 through the electromagnet control switch, and the return spring 11 and the brake release electromagnet coil 12 act simultaneously to move the brake pressure disc 8 toward the direction of the brake assembly housing 13, and the brake pressure disc 8 returns to the initial position. The π-shaped brake pad 84 on the brake pressure disc 8 moves away from the dual steel plate 5 and releases the sliding wear on the friction plate 4, and the braking force of the intermediate shaft 1 is released;

[0054] The transmission controller TCU controls the switch through the electromagnet to de-energize the brake force release electromagnet coil 12 1 second after it is energized, and the brake stops working. At this time, the return spring 11 is used to maintain the state and buffer.

[0055] The electromagnetic intermediate shaft brake structure of the utility model is improved on the basis of the existing integrated 8 and 9-speed AMT structure. Compared with the electric-controlled pneumatic structure brake, it eliminates the complicated air circuit connection, and has better precision performance than the electromagnetic control. The structure is compact and the safety and reliability are further improved.

[0056] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or replacements within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An electromagnetic intermediate shaft brake, characterized in that: It comprises a brake assembly housing (13), a brake electromagnet core (6), a brake pressure disc (8), a brake component and a reset component; One end of the intermediate shaft (1) is arranged on the gearbox housing (2) through a bearing (3) and extends out of the gearbox housing (2); The brake assembly housing (13) is fixed on the gearbox housing (2), and the brake assembly housing (13) is coaxially arranged with the intermediate shaft (1), and a brake cavity is formed between the brake assembly housing (13) and the gearbox housing (2); the brake electromagnet core (6), the brake pressure disc (8) and the reset assembly are all located in the brake cavity; The brake electromagnet core (6) is coaxially sleeved on one end of the intermediate shaft (1) extending into the brake cavity, and the brake electromagnet core (6) is connected to the gearbox housing (2); the brake assembly is arranged on the inner ring of the brake electromagnet core (6) and sleeved on the intermediate shaft (1); the outer ring of the brake electromagnet core (6) is provided with a brake electromagnet coil (7); and a brake release electromagnet coil (12) is provided on the inner wall of the brake assembly housing (13) at a position corresponding to the brake electromagnet coil (7) along the axial direction; The brake pressure disc (8) is coaxially arranged between the brake assembly housing (13) and the brake electromagnet core (6); a brake ring (81) is sleeved on the brake pressure disc (8), and the brake ring (81) is located between the brake electromagnet coil (7) and the brake release electromagnet coil (12); The brake electromagnet coil (7) and the brake release electromagnet coil (12) are respectively electrically connected to an external gearbox controller, and are used to energize the brake electromagnet coil (7) so that the brake ring (81) drives the brake pressure plate (8) to move in the direction of the brake electromagnet core (6) and generate a braking force through the brake assembly, or energize the brake release electromagnet coil (12) so that the brake ring (81) drives the brake pressure plate (8) to move in the direction of the brake assembly housing (13) to release the braking force; The reset assembly is arranged between the end of the intermediate shaft (1) and the brake pressure disc (8), and is used to reset the brake pressure disc (8) and the brake assembly after the braking force is released.

2. The electromagnetic intermediate shaft brake according to claim 1, characterized in that: The brake pressure disc (8) is a π-shaped brake pad (84) with a hollow cylindrical shape and an opening facing the intermediate shaft (1); a connecting cylinder (83) with an opening facing the intermediate shaft (1) is sleeved on the outer side of the π-shaped brake pad (84); and the brake ring (81) is sleeved on the open end of the connecting cylinder (83); A first cylindrical cavity (131) adapted to the outer diameter of the π-shaped brake pad (84) and a second cylindrical cavity (132) adapted to the outer diameter of the connecting cylinder (83) are sequentially arranged on the inner wall of the brake assembly housing (13); The end of the π-shaped brake pad (84) away from the opening is sleeved in the first cylindrical cavity (131) through a support ring (9), and the connecting cylinder (83) is located in the second cylindrical cavity (132); The end of the π-shaped brake pad (84) close to the intermediate shaft (1) is used to cooperate with the brake assembly during braking; The cylindrical bottom of the π-shaped brake pad (84) is provided with a positioning protrusion (85) for cooperating with the reset assembly when the brake is released; The brake release electromagnet coil (12) is arranged between the second cylindrical cavity (132) and the brake assembly housing (13).

3. The electromagnetic intermediate shaft brake according to claim 2, characterized in that: The reset assembly comprises a top cap (10) and a reset spring (11); One end of the intermediate shaft (1) is provided with a first groove adapted to fit the top cap (10); One end of the top cap (10) abuts against the positioning protrusion (85), the other end is located in the first groove, and the other end is provided with a second groove; One end of the return spring (11) abuts against the bottom of the first groove, and the other end abuts against the bottom of the second groove.

4. The electromagnetic intermediate shaft brake according to claim 3, characterized in that: The brake assembly comprises a plurality of paired steel plates (5) and a plurality of friction plates (4), wherein the plurality of paired steel plates (5) and the plurality of friction plates (4) are arranged at intervals; The friction plate (4) is arranged on the intermediate shaft (1) via a spline; the dual steel plate (5) is connected to the inner ring of the brake electromagnet core (6).

5. The electromagnetic intermediate shaft brake according to claim 4, characterized in that: The outer diameter of the top cap (10) is clearance-matched with the inner wall of the first groove at one end of the intermediate shaft (1).

6. The electromagnetic intermediate shaft brake according to claim 5, characterized in that: An electromagnet control switch is provided on the brake assembly housing (13); The braking electromagnet coil (7) and the braking releasing electromagnet coil (12) are respectively electrically connected to an external gearbox controller via an electromagnet control switch.

7. The electromagnetic intermediate shaft brake according to claim 6, characterized in that: The number of the friction plates (4) is at least 2; The number of the paired steel sheets (5) is at least 3.

8. The electromagnetic intermediate shaft brake according to claim 7, characterized in that: The braking electromagnet coil (7) and the braking release electromagnet coil (12) are wound in the same manner.

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