EMB driving, speed regulating and self-locking mechanism

Abstract

The utility model discloses an EMB driving, speed regulating and self-locking mechanism. Comprising two sets of worm and gear assemblies, an input shaft, an input side bevel gear, an output side bevel gear, an output shaft, a differential mechanism shell and a plurality of sun gears. The two worm and gear assemblies are connected to the differential mechanism shell and the input shaft respectively, the input shaft is coaxially and fixedly connected with the input side bevel gear, the output side bevel gear is coaxially and fixedly connected with the output shaft, and the input side bevel gear and the output side bevel gear are in meshing transmission connection through a plurality of sun gears. A sun gear is rotatably mounted on the differential housing. According to the mechanism, the driving, speed regulation and self-locking functions of the EMB can be effectively achieved, the independent driving function can be achieved through two sets of power, the coupling driving function and the locking function can also be achieved, the function redundancy purpose is achieved, and the reliability of the EMB is fully guaranteed.

Description

Technical Field

[0001] The utility model relates to a brake actuator for an automobile, in particular to an EMB mechanism with driving, speed regulating and self-locking functions. Technical Background

[0002] Traditional brake calipers are liquid-driven, with the brake master cylinder transferring the oil to the brake caliper through pipes. The entire process requires high-pressure sealing, but as the rubber seals age and wear, there will be risks such as oil leakage and reduced braking force. In addition, the hydraulic transmission efficiency is only about 80%, and the pressure response rate is relatively low. The parking brake requires a separate braking mechanism and cannot be used in daily braking conditions. Utility Model Content

[0003] In order to solve the problems existing in the background technology, the utility model proposes an EMB mechanism with driving, speed regulation and self-locking functions, which is suitable for automobile electronic brake actuators.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The utility model comprises two sets of worm gear assemblies, an input shaft, an input side bevel gear, an output side bevel gear, an output shaft, a differential housing and a plurality of sun gears; the two sets of worm gear assemblies are respectively connected to the differential housing and the input shaft, the input shaft and the input side bevel gear are coaxially fixedly connected, the output side bevel gear and the output shaft are coaxially fixedly connected, the input side bevel gear and the output side bevel gear are meshed and driven by a plurality of sun gears, and the sun gears are rotatably mounted on the differential housing.

[0006] The input side bevel gear, the output side bevel gear and a plurality of sun gears are all installed in the differential housing.

[0007] One end of the differential housing is fixedly and sealedly connected to the wheel end face of a driven worm wheel of a worm gear assembly, and the other end is rotatably sleeved on the output shaft through a bearing.

[0008] Each worm gear assembly includes a worm and a driven worm wheel. The worm is connected to the power source. The worm and the driven worm wheel are meshed to form a worm gear pair. The driven worm wheel is coaxially rotatable / coaxially fixedly mounted on the input shaft.

[0009] The driven worm gear of one set of worm gear assemblies is coaxially fixedly connected to the input shaft, and the driven worm gear of the other set of worm gear assemblies is rotatably coaxially sleeved on the input shaft and fixedly connected to the differential housing.

[0010] The plurality of sun gears are arranged between the input side bevel gear and the output side bevel gear and arranged along the circumferential direction. One side of each sun gear is meshed with the input side bevel gear, and the other side is meshed with the output side bevel gear.

[0011] The plurality of sun gears are evenly spaced along the circumferential direction and rotatably mounted on the inner wall of the differential housing. Each sun gear is hingedly mounted on the inner wall of the differential housing.

[0012] The utility model is driven by two sets of worm gear transmission mechanisms with independent self-locking functions, which can cooperate with the two external input rotational torques to achieve speed reduction and torque increase. The torque and speed are coupled through the sun gear in the transmission housing, and then the rotational torque is transmitted to the ball screw inside the caliper through the output shaft, thereby driving the piston movement in the caliper to realize EMB brake clamping, holding and brake release actions.

[0013] The transmission mechanisms corresponding to the two sets of worm gear assemblies have independent drive and self-locking functions. Each set of worm gear transmission mechanisms can amplify the rotational torque input by the worm and transmit it to the output shaft; when there is no power input to the two sets of worm gears, the self-locking function of the worm gears will keep the EMB in a released, non-braking or clamping locked state.

[0014] The rotational torque and speed transmitted by the two sets of worm gears are coupled with each other through the sun gear in the transmission housing, and work together to realize the speed and torque regulation function, which expands the output shaft rotation speed range, reduces the difficulty and requirements of motor control, and the power connection is linear and smooth.

[0015] The two sets of worm gear assemblies in the EMB mechanism are divided into a first set of worm gear assemblies and a second set of worm gear assemblies; the first set of worm gear assemblies includes a first worm and a first driven worm wheel, and the first driven worm wheel is coaxially connected to the input shaft; the second set of worm gear assemblies includes a second worm and a second driven worm wheel, and the second driven worm wheel is coaxially fixedly connected to the differential housing to form a whole, and the second driven worm wheel is coaxially movable with the input shaft;

[0016] In specific implementation, the mechanism can be operated in different situations through the following four speed regulation modes:

[0017] A. When it is necessary to control the output power of the output shaft at a lower speed and a larger torque, the first set of worm gear assembly is driven by external power, and the second set of worm gear assembly is not driven by external power:

[0018] The first worm of the first worm gear assembly rotates in the positive direction under the external power, driving the first driven worm gear, the input shaft and the input side bevel gear to rotate as a whole, and then driving the output side bevel gear and the output shaft to rotate through the transmission of the sun gear;

[0019] B. When it is necessary to control the output power of the output shaft at a higher speed and smaller torque, the second set of worm gear assembly is driven by external power, and the first set of worm gear assembly is not driven by external power:

[0020] The second worm of the second worm gear assembly rotates in the positive direction under the external power, driving the second driven worm gear and the differential housing to rotate as a whole, while the first driven worm gear, the input shaft and the input side bevel gear of the first worm gear assembly do not rotate as a whole, and the multiple sun gears rotate around the axis of the output shaft, thereby driving the output side bevel gear and the output shaft to rotate;

[0021] C. When it is necessary to control the output shaft to output power at a higher speed, both the first set of worm gear assemblies and the second set of worm gear assemblies are driven by external power:

[0022] The first worm of the first worm gear assembly and the second worm of the second worm gear assembly are both rotated in the positive direction by external power, and are transmitted to the sun gear for power superposition. The power is then transmitted by the sun gear to drive the output side bevel gear and the output shaft to rotate at a higher speed.

[0023] D. When it is necessary to output power at zero speed or quickly switch the output shaft forward / reverse rotation, both the first set of worm gear assemblies and the second set of worm gear assemblies are driven by external power:

[0024] The first worm of the first set of worm gear assembly and the second worm of the second set of worm gear assembly are respectively rotated forward / reverse by external power, and both are transmitted to the sun gear for power speed subtraction. The subtracted power is transmitted through the sun gear to drive the output side bevel gear and the output shaft to rotate forward / reverse at zero speed or quickly switch the output shaft.

[0025] The speed regulation method also includes: when a quick response is required to reach the required output speed, the second set of worm gear components is first controlled to be driven by external power and the first set of worm gear components is not driven by external power, so that the power speed output by the output shaft is quickly adjusted to the required output speed, and then the first set of worm gear components and the second set of worm gear components are switched to be driven by external power together, and the speed of the first set of worm gear components acting on the output shaft is gradually increased, while the speed of the second set of worm gear components acting on the output shaft is reduced and increased, so that the torque output of the output shaft is increased while keeping the power speed output by the output shaft unchanged, thereby achieving torque increase at the same speed.

[0026] The technical problems and economic benefits to be solved by this utility model are:

[0027] (1) The double worm gears and sun gear structure can independently transmit rotational torque and also perform coupled speed regulation;

[0028] (2) The self-locking functions of the double worm gear structure are independent of each other.

[0029] The mechanism of the utility model can effectively realize the driving, speed regulation and self-locking functions of the EMB, and the two sets of power can realize independent driving functions, and can also perform coupled driving and locking functions to achieve functional redundancy and fully ensure the reliability of the EMB. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The following is a further description of this innovative structure with reference to the accompanying drawings and specific implementations:

[0031] Figure 1 It is a schematic diagram of the structure of the utility model.

[0032] Figure 2 This is the first set of worm gear components in the utility model that independently drives and transmits power.

[0033] Figure 3 This is a diagram of the second set of worm gear components independently driving and transmitting power in the utility model.

[0034] Figure 4 The utility model is a diagram of two sets of worm gear components coupled to drive and transmit power.

[0035] Figure 5 It is a schematic structural diagram of the utility model.

[0036] Figure 6 It is an overall cross-sectional view of the utility model.

[0037] Figure 7 This is the structural diagram of the first set of worm gear components of the utility model.

[0038] Figure 8 This is the structural diagram of the input shaft of the utility model.

[0039] Figure 9 This is the structural diagram of the second set of worm gear components of the utility model.

[0040] Figure 10 This is a structural diagram of the output shaft of the utility model.

[0041] In the figure: first worm 1, first driven worm gear 2, second worm 3, second driven worm gear 4, input shaft 5, input side bevel gear 6, output side bevel gear 7, output shaft 8, differential case 9, sun gear 10. DETAILED DESCRIPTION

[0042] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0043] like Figure 1As shown, it includes two sets of worm gear assemblies, an input shaft 5, an input side bevel gear 6, an output side bevel gear 7, an output shaft 8, a differential housing 9 and several sun gears 10; the two sets of worm gear assemblies are respectively connected to the differential housing 9 and the input shaft 5, the input shaft 5 and the input side bevel gear 6 are coaxially fixedly connected, the output side bevel gear 7 and the output shaft 8 are coaxially fixedly connected, the input side bevel gear 6 and the output side bevel gear 7 are coaxially spaced, the input side bevel gear 6 and the output side bevel gear 7 are meshed and driven by several sun gears 10, and the sun gear 10 is rotatably hingedly mounted on the differential housing 9.

[0044] Under the whole mechanism, the motor drives the worms in the two sets of worm gear assemblies to rotate, and then the power is output through the output shaft 8.

[0045] The input-side bevel gear 6 , the output-side bevel gear 7 and a plurality of sun gears 10 are all housed in the differential housing 9 .

[0046] like Figure 6 As shown, one end of the differential housing 9 is fixedly and sealedly connected to the wheel end face of the driven worm wheel of a worm gear assembly to form an integrated structure; and the other end is rotatably mounted on the output shaft 8 through a bearing.

[0047] Each worm gear assembly includes a worm and a driven worm wheel. The worm is connected to the power source, and the worm and the driven worm wheel are meshed to form a worm gear pair. Figure 8 As shown, the driven worm gear is coaxially rotatable / coaxially fixedly mounted on the input shaft 5 .

[0048] The power source is, for example, a motor.

[0049] The worm gear pairs of the two sets of worm gear assemblies are arranged in parallel and at intervals.

[0050] The driven worm gear of one set of worm gear assemblies is coaxially fixedly connected to the input shaft 5 , and the driven worm gear of the other set of worm gear assemblies is rotatably coaxially sleeved on the input shaft 5 and fixedly connected to the differential housing 9 .

[0051] Several sun gears 10 are arranged between the input bevel gear 6 and the output bevel gear 7 and arranged along the circumferential direction. One side of each sun gear 10 meshes with the input bevel gear 6 and the other side meshes with the output bevel gear 7 .

[0052] A plurality of sun gears 10 are evenly spaced along the circumference and rotatably mounted on the inner wall of the differential housing 9. Each sun gear 10 is hingedly mounted on an axle fixed to the inner wall of the differential housing 9. That is, each sun gear 10 is movably mounted on a radially arranged axle fixed to the inner wall of the differential housing 9.

[0053] like Figure 8As shown, one end of the input shaft is connected to the bearing on the caliper housing and can rotate axially. There is also a spline on the input shaft near this end. The first driven worm gear 2 is connected to the input shaft through the spline to transmit power. The other end of the input shaft is provided with bevel teeth and fully extends into the differential housing, meshing with the three sun gears inside the differential housing.

[0054] One end of the first worm 1 is connected to the external motor, and the other end is connected to the bearing on the caliper housing, and can rotate axially. The middle part of the first worm 1 is provided with threaded teeth, which is used to engage with the first driven worm gear 2. When the external motor transmits the torque speed to the first worm 1, the first worm 1 drives the first driven worm gear 2 to reduce speed and increase torque, and transmits power to the input shaft through the spline. The input shaft then passes through the bevel gear and the sun gear in the differential housing, and finally transmits power to the output shaft.

[0055] One end of the second worm 3 is connected to the external motor, and the other end is connected to the bearing on the caliper housing, and can rotate axially. The middle part of the second worm 3 is provided with threaded teeth for engaging with the second driven worm gear 4. When the torque speed of the external motor is transmitted to the second worm 3, the second worm 3 drives the second driven worm gear 4 to reduce speed and increase torque, and transmits power to the output shaft through the sun gear in the differential housing.

[0056] The worm teeth of the first driven worm gear 2 mesh with the threads of the first worm 1, enabling power transmission and self-locking. The socket teeth of the second driven worm gear 4 mesh with the threads of the second worm 3, enabling power transmission and self-locking. The second driven worm gear 4 is rigidly connected to the transmission housing (or an integral structure). Three sun gears are evenly distributed around the interior of the transmission housing, meshing with the bevel gears on the input and output shafts to couple torque and speed for power transmission.

[0057] like Figure 9 As shown, the other end of the output shaft 8 is provided with a spline, and the output shaft 8 is connected to the ball screw in the brake caliper through the spline to transmit power.

[0058] In specific implementation, Figure 5 and Figure 6 As shown, the worm gear assembly includes two independent sets and three sun gears 10, namely a first worm 1 and a first driven worm gear 2, a second worm 3 and a second driven worm gear 4.

[0059] Specifically, if Figure 7 As shown, the first set of worm gear assembly includes a first worm 1 and a first driven worm wheel 2. The first driven worm wheel 2 and the input shaft 5 are coaxially connected to form a whole. There is no connection between the first driven worm wheel 2 and the differential housing 9. Figure 9As shown, the second worm gear assembly includes a second worm 3 and a second driven worm wheel 4. The second driven worm wheel 4 and the differential housing 9 are coaxially fixedly connected to form a whole. At the same time, the second driven worm wheel 4 and the input shaft 5 are coaxially movable.

[0060] The first driven worm gear 2 is sleeved on the spline at one end of the input shaft 5, and the other end of the input shaft 5 is provided with bevel teeth as the input side bevel gear 6. The input side bevel gear 6 at this end is sleeved in the differential case 9 and meshes with the three sun gears 10 in the differential case 9. The second driven worm gear 4 is rigidly connected to the differential case 9 to form an integrated structure. One end of the output shaft 8 is provided with bevel teeth as the output side bevel gear 7. The output side bevel gear 7 at this end is also sleeved in the differential case 9 and meshes with the three sun gears in the differential case 9. The other end of the output shaft 8 is provided with a spline, which can be connected to the ball screw inside the brake caliper of the brake for power transmission.

[0061] When the brake caliper needs to be clamped or released to drive the piston to move, the power transmission is specifically divided into:

[0062] When external power only drives the first worm 1 to rotate and the second worm 3 does not rotate, the power will be transmitted through the first driven worm gear 2 to reduce the speed and increase the torque. The speed and amplified torque are transmitted to the ball screw through the input shaft 5, the sun gear 9 and the output shaft 8, driving the piston to move.

[0063] When external power only drives the second worm 3 to rotate and the first worm 1 does not rotate, the power will be transmitted through the second driven worm gear 4 to reduce the speed and increase the torque. The speed and amplified torque are transmitted to the ball screw through the differential case 9, the sun gear 10, and the output shaft 8, thereby driving the piston to move.

[0064] When external power drives the first worm 1 and the second worm 3 to rotate at the same time, the power will be transmitted through the first driven worm gear 2 and the second driven worm gear 4 to reduce the speed and increase the torque. The speed and the amplified torque are respectively transmitted through the input shaft 5 and the differential housing 9, and torque coupling is performed at the sun gear 10. The torque is then transmitted to the ball screw through the output shaft 8 to drive the piston movement.

[0065] When the brake caliper needs to be clamped and locked or kept released without braking, when the external power stops driving the worm to rotate, the first worm 1 and the second worm 3 will be locked with the first driven worm gear 2 and the second driven worm gear 4, which will prevent the output shaft 8 from rotating and then prevent the piston from moving, thereby realizing the caliper clamping and locking or keeping the release without braking function.

[0066] The two sets of worm gear assemblies in the EMB mechanism are divided into a first set of worm gear assemblies and a second set of worm gear assemblies;

[0067] The first worm gear assembly includes a first worm 1 and a first driven worm wheel 2, which are coaxially sleeved with the input shaft 5. The second worm gear assembly includes a second worm 3 and a second driven worm wheel 4, which are coaxially fixedly connected to the differential housing 9 to form a whole. The second driven worm wheel 4 is coaxially sleeved with the input shaft 5.

[0068] The speed regulation method uses four speed regulation modes to adjust the operation under different conditions:

[0069] A. When it is necessary to control the output shaft 8 to output power at a lower speed and a larger torque, such as Figure 2 As shown, the first set of worm gear components is driven by external power, and the second set of worm gear components is not driven by external power:

[0070] The first worm 1 of the first worm gear assembly rotates in the positive direction under the influence of external power, driving the first driven worm gear 2, the input shaft 5 and the input side bevel gear 6 to rotate as a whole, and the output side bevel gear 7 and the output shaft 8 are driven to rotate at the transmission ratio of the first worm gear assembly through the transmission of the sun gear 10; the second driven worm gear 4 of the second worm gear assembly and the differential case 9 do not rotate as a whole.

[0071] In this case, since the transmission of the first set of worm gear components through the input shaft 5, sun gear 10, and output shaft 8 is relatively small, under the same external power input speed, the output shaft 8 has a larger torque and a smaller speed, which can be used to achieve torque increase and speed reduction, and is used for high-intensity braking.

[0072] B. When it is necessary to control the output shaft 8 to output power at a higher speed and smaller torque, such as Figure 3 As shown, the second set of worm gear assembly is driven by external power, and the first set of worm gear assembly is not driven by external power:

[0073] The second worm 3 of the second worm gear assembly rotates forward under external power, driving the second driven worm gear 4 and the differential case 9 to rotate as a whole, while the first driven worm gear 2, the input shaft 5 and the input side bevel gear 6 of the first worm gear assembly do not rotate as a whole. The multiple sun gears 10 rotate around the axis of the output shaft 8 and then drive the output side bevel gear 7 and the output shaft 8 to rotate at the transmission ratio of the second worm gear assembly to the differential case 9 and the sun gear 10.

[0074] In this case, since the transmission of the second worm gear assembly driven by the differential housing 9 and the sun gear 10 is relatively small, under the same external power input speed, the torque is small and the speed is large, which can be used to achieve speed increase and torque reduction for rapid braking response.

[0075] C. When it is necessary to control the output shaft 8 to output power at a higher speed, such as Figure 4 As shown, the first set of worm gear assemblies and the second set of worm gear assemblies are both driven by external power:

[0076] The first worm 1 of the first worm gear assembly and the second worm 3 of the second worm gear assembly are both driven by external power to rotate in the positive direction, and are both transmitted to the sun gear 10 for power speed superposition. The transmission ratios of the two sets of worm gear assemblies are superimposed, and then the output side bevel gear 7 and the output shaft 8 are driven by the transmission of the sun gear 10 and other gears to rotate at a higher speed than the sum of the transmission ratios of the two sets of worm gear assemblies.

[0077] In this case, due to the combined effect of the two worm gear assemblies and the superimposed transmission ratio, the speed is maximum under the same external power input speed, and the torque also increases at this time, which can be used to achieve speed increase and torque increase.

[0078] When it is necessary to output power at zero speed or to quickly switch the output shaft 8 in forward / reverse rotation, both the first set of worm gear assemblies and the second set of worm gear assemblies are driven by external power:

[0079] The second worm 3 of the second worm gear assembly and the first worm 1 of the first worm gear assembly are both driven by external power to rotate forward and reverse respectively, and both are transmitted to the sun gear 10 for power speed subtraction. The transmission ratios of the two sets of worm gear assemblies are subtracted, and the output side bevel gear 7 and the output shaft 8 are driven by the transmission of the sun gear 10 to rotate forward / reverse at zero speed or quickly switch the output shaft 8 at a transmission ratio difference between the two sets of worm gear assemblies.

[0080] In this case, since the transmission ratios of the two worm gear assemblies are subtracted through the joint action of the input shaft 5, the differential housing 9, and the sun gear 10, under the same external power input speed, the speed is in the middle and the torque is also in the middle, which can be used to achieve speed and torque adjustment, improve the control accuracy of the brake, achieve more precise adjustment, and prevent the brake from locking.

[0081] For example, the speed control method also includes:

[0082] When the brake is started and a quick response is required to reach the required output speed, the second set of worm gear assemblies is first controlled to be driven by external power and the first set of worm gear assemblies is not driven by external power, so that the power speed output by the output shaft 8 is quickly adjusted to the required output speed, and then the first set of worm gear assemblies and the second set of worm gear assemblies are switched to be driven by external power together, and the speed of the first set of worm gear assemblies acting on the output shaft 8 is gradually increased, while the speed of the second set of worm gear assemblies acting on the output shaft 8 is reduced and increased, so that the torque output by the output shaft 8 is increased while keeping the power speed output by the output shaft 8 unchanged, thereby achieving torque increase at the same speed.

Claims

1. An EMB drive, speed regulation, and self-locking mechanism, characterized by: The invention comprises two sets of worm gear assemblies, an input shaft (5), an input side bevel gear (6), an output side bevel gear (7), an output shaft (8), a differential housing (9) and a plurality of sun gears (10); the two sets of worm gear assemblies are respectively connected to the differential housing (9) and the input shaft (5); the input shaft (5) and the input side bevel gear (6) are coaxially fixedly connected; the output side bevel gear (7) and the output shaft (8) are coaxially fixedly connected; the input side bevel gear (6) and the output side bevel gear (7) are meshed and driven by a plurality of sun gears (10); and the sun gears (10) are rotatably mounted on the differential housing (9).

2. The EMB drive, speed regulation, and self-locking mechanism according to claim 1, characterized in that: The input side bevel gear (6), the output side bevel gear (7) and the plurality of sun gears (10) are all mounted in a differential housing (9).

3. The EMB drive, speed regulation, and self-locking mechanism according to claim 1, characterized in that: One end of the differential housing (9) is fixedly sealed and connected to the wheel end face of a driven worm wheel of a worm gear assembly, and the other end is rotatably sleeved on the output shaft (8) via a bearing.

4. The EMB drive, speed regulation, and self-locking mechanism according to claim 1, characterized in that: Each worm gear assembly includes a worm and a driven worm wheel, the worm is connected to the power source, the worm and the driven worm wheel are meshed to form a worm gear pair, and the driven worm wheel is coaxially rotatable / coaxially fixedly mounted on the input shaft (5).

5. The EMB drive, speed regulation, and self-locking mechanism according to claim 1, characterized in that: The driven worm gear of one set of worm gear assemblies is coaxially fixedly connected to the input shaft (5), and the driven worm gear of the other set of worm gear assemblies is rotatably coaxially sleeved on the input shaft (5) and fixedly connected to the differential housing (9).

6. The EMB drive, speed regulation, and self-locking mechanism according to claim 1, characterized in that: The plurality of sun gears (10) are arranged between the input side bevel gear (6) and the output side bevel gear (7) and are arranged in the circumferential direction; one side of each sun gear (10) is meshed with the input side bevel gear (6) and the other side is meshed with the output side bevel gear (7).

7. The EMB drive, speed regulation, and self-locking mechanism according to claim 1, characterized in that: The plurality of sun gears (10) are evenly spaced along the circumferential direction and rotatably mounted on the inner wall of the differential housing (9), and each sun gear (10) is hingedly mounted on the inner wall of the differential housing (9).

Images