Driving device, windscreen wiper and vehicle

Abstract

The invention provides a driving device, a windscreen wiper and a vehicle, and the driving device comprises an output shaft which is used for being connected with a driving target and has a first axial direction. And the first transmission assembly is connected with the output shaft. The driving module is connected with the first transmission assembly and used for driving the output shaft to do reciprocating rotation motion around the first axial direction through the first transmission assembly. When the first transmission assembly generates extrusion force perpendicular to the first axial direction, lifting force in the first axial direction is generated, so that the output shaft moves in the first axial direction. Not only can the output shaft do reciprocating rotation motion be met, but also the output shaft can be lifted.

Description

Technical Field

[0001] The present application relates to the technical field of windshield wipers, and particularly to a driving device, a windshield wiper and a vehicle. Background Art

[0002] In currently common driving devices for windshield wipers, the distance between the wiper arm and the vehicle glass is usually fixed and non-adjustable. There are situations such as dry wiping in the windshield wiper, resulting in problems such as a decrease in speed due to excessive friction force of the wiper arm, and wear failure. In related technologies, by increasing the torque of the wiper arm to overcome the resistance, although the deceleration can be improved, the wear and noise are increased. Summary of the Invention

[0003] The present application provides a driving device, a windshield wiper and a vehicle to solve at least some problems in the prior art.

[0004] In a first aspect, an embodiment of the present application provides a driving device, including:

[0005] An output shaft for connecting a driving target, the output shaft having a first axial direction;

[0006] A first transmission component connected to the output shaft;

[0007] A driving module connected to the first transmission component, the driving module being configured to drive the output shaft to reciprocally rotate around the first axial direction through the first transmission component; when a squeezing force perpendicular to the first axial direction occurs in the first transmission component, a lifting force along the first axial direction is generated to move the output shaft along the first axial direction.

[0008] Optionally, the first transmission component includes a shaft gear and an arm gear. The shaft gear is fixedly connected to a first end of the output shaft along the first axial direction. The shaft gear has a second axial direction, and the second axial direction is parallel to the first axial direction; a plurality of protruding first wedge teeth are provided on the outer periphery of the shaft gear, and the width of the first wedge teeth gradually decreases along the second axial direction from the end of the shaft gear close to the output shaft to the end away from the output shaft; the arm gear is connected to the driving module, the arm gear is provided with a plurality of second wedge teeth adapted to the first wedge teeth, the second wedge teeth are engaged with the first wedge teeth, and the arm gear has a third axial direction, and the third axial direction is parallel to and non-coaxial with the second axial direction;

[0009] The driving module is used to drive the arm gear to rotate around the third axis, drive the shaft gear to reciprocally rotate around the second axis through the arm gear, and drive the output shaft to reciprocally rotate around the first axis; when a squeezing force perpendicular to the second axis occurs between the first wedge tooth and the second wedge tooth, a lifting force is generated therebetween, so that the shaft gear moves along the second axis, thereby driving the output shaft to move along the first axis.

[0010] Optionally, the arm gear includes a rotating part, a connecting rod, and a gear part, and the connecting rod is connected between the rotating part and the gear part; the rotating part has the third axis and is connected to the driving module, and the gear part is provided with the second wedge tooth.

[0011] Optionally, the driving module includes a driving member and a second transmission component connected to the driving member, and the second transmission component is connected to the arm gear; the driving member is used to drive the arm gear to rotate around the third axis through the second transmission component.

[0012] Optionally, the second transmission component includes a first transmission member and a second transmission member, the first transmission member is connected to the driving member, the second transmission member is connected to the first transmission member, and the arm gear is rotatably connected to the second transmission member; the first transmission member has a fourth axis, the second transmission member has a fifth axis, the fifth axis is parallel to and non-coaxial with the third axis, and the fourth axis is perpendicular to the fifth axis;

[0013] The driving member is used to drive the first transmission member to rotate around the fourth axis, drive the second transmission member to rotate around the fifth axis through the first transmission member, and the second transmission member drives the arm gear to rotate around the third axis.

[0014] Optionally, the driving module further includes a first pin shaft and a second pin shaft, the first pin shaft is arranged along the fifth axis, and the second transmission member is rotatably sleeved on the first pin shaft; the second pin shaft is arranged along the third axis, the second pin shaft is fixedly connected to the second transmission member, and the arm gear is rotatably sleeved on the second pin shaft.

[0015] Optionally, the second transmission member is in a hollow ring shape, the inner wall of the second transmission member is provided with a first extension portion, and the outer wall of the first extension portion is provided with a second extension portion; the first extension portion is provided with a first shaft hole, and the first shaft hole is arranged along the third axis; the second extension portion is provided with a second shaft hole, and the second shaft hole is arranged along the fifth axis; the first pin shaft is movably arranged in the second shaft hole, and the second pin shaft is fixedly arranged in the first shaft hole.

[0016] Optionally, the first transmission member is a worm, and the second transmission member is a worm wheel.

[0017] Optionally, it further includes a controller, electrically connected to the driving module; the reciprocating rotational motion of the arm gear includes an intermediate position and two extreme positions, and the controller is configured to perform at least one of the following:

[0018] During the movement of the arm gear from the intermediate position to any one of the extreme positions, control the driving module to gradually decelerate the arm gear;

[0019] During the movement of the arm gear from any one of the extreme positions to the intermediate position, control the driving module to gradually accelerate the arm gear.

[0020] Optionally, it further includes an elastic member, sleeved on the output shaft and abutted against the output shaft or the first transmission assembly, for generating an elastic force along the first axial direction on the output shaft, and the direction of the elastic force is opposite to the direction of the lifting force; when the lifting force is greater than the elastic force, the output shaft moves along the first axial direction.

[0021] In a second aspect, an embodiment of the present application provides a windshield wiper, including a wiper arm, a housing, and the driving device as described in the first aspect; at least a part of the driving device is disposed in the housing, and the wiper arm is connected to the driving device.

[0022] In a third aspect, an embodiment of the present application provides a vehicle, including a vehicle body and the windshield wiper as described in the second aspect, and the windshield wiper is installed on the vehicle body.

[0023] The driving device provided by the present application can not only satisfy the reciprocating rotational motion of the output shaft, but also generate a lifting force along the first axial direction when a squeezing force perpendicular to the first axial direction occurs in the first transmission assembly, and when the lifting force is greater than the elastic force generated by the elastic member, the first transmission assembly drives the output shaft to move along the first axial direction under the action of the lifting force, playing a role in lifting the output shaft. Description of the Drawings

[0024] Figure 1 is an isometric view of a windshield wiper provided by an embodiment of the present application.

[0025] Figure 2 is a front view of a windshield wiper provided by an embodiment of the present application.

[0026] Figure 3 is Figure 2 a schematic diagram after removing the upper cover and the wiper arm.

[0027] Figure 4 is Figure 3 a partial enlarged schematic diagram of

[0028] Figure 5 It is the rear view of the windshield wiper provided by an embodiment of the present application.

[0029] Figure 6 It is Figure 5 A schematic diagram after removing the lower cover and the wiper arm.

[0030] Figure 7 It is Figure 6 The sectional view of the A-A plane in

[0031] Figure 8 It is Figure 6 The sectional view of the F-F plane in

[0032] Figure 9 It is the top view of the windshield wiper provided by an embodiment of the present application.

[0033] Figure 10 It is Figure 9 The partial schematic diagram of

[0034] Figure 11 It is Figure 10 The sectional view of the E-E plane in

[0035] Figure 12 It is Figure 10 The sectional view of the C-C plane in

[0036] Figure 13 It is Figure 12 The sectional view of the B-B plane in

[0037] Figure 14 It is the structural schematic diagram of the wiper arm provided by an embodiment of the present application.

[0038] Figure 15 It is the structural schematic diagram of the housing provided by an embodiment of the present application.

[0039] Figure 16 It is the isometric view of the windshield wiper after removing the housing and the wiper arm provided by an embodiment of the present application.

[0040] Figure 17 It is the structural schematic diagram of the shaft gear provided by an embodiment of the present application.

[0041] Figure 18 It is the structural schematic diagram of the arm gear provided by an embodiment of the present application.

[0042] Figure 19 It is the structural schematic diagram of the driving member and the first transmission member provided by an embodiment of the present application.

[0043] Figure 20 It is the structural schematic diagram of the second transmission member provided by an embodiment of the present application.

[0044] Figures 21 to 24 Yes Figure 6 Schematic diagrams of four different states after removing the upper cover and the driving member.

[0045] Figure 25 It is a θ-γ relationship diagram of a windshield wiper provided by an embodiment of the present application.

[0046] Figure 26 It is a θ-t relationship diagram of the solution with a controller set in the present application and the solution without a controller set. Detailed implementation manners

[0047] Here, the technical solutions in the embodiments (or "implementation manners") of the present application will be clearly and completely described in conjunction with the accompanying drawings. When the following description involves the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements.

[0048] If there are terms related to directional indications or positional relationships in the embodiments of the present application (such as up, down, left, right, front, back, inside, outside, top, bottom, center, vertical, horizontal, longitudinal, transverse, length, width, counterclockwise, clockwise, axial, radial, circumferential, etc.), such terms are only used to explain the relative positional relationships and motion conditions between components in a specific posture (as shown in the accompanying drawings); if the specific posture changes, then the directional indication or positional relationship also changes accordingly. In addition, terms such as "first" and "second" in the embodiments of the present application are only for the purpose of convenient description and cannot be understood as indicating or implying relative importance.

[0049] The present application provides a driving device, a windshield wiper and a vehicle. The driving device, the windshield wiper and the vehicle of the present application will be introduced in detail below in conjunction with the accompanying drawings. Without conflict, the features in the following embodiments and implementation manners can be combined with each other.

[0050] An embodiment of the present application provides a vehicle, including a vehicle body and a windshield wiper, and the windshield wiper is installed on the vehicle body. Refer to Figures 1 to 13 As shown, the windshield wiper includes a wiper arm 10, a housing 20 and a driving device 30, and at least a part of the driving device 30 is arranged in the housing 20. The driving device 30 is connected to the wiper arm 10 and is used to drive the wiper arm 10 to perform a reciprocating rotational motion, and the motion trajectory is as shown in the Figure 1 sector area in.

[0051] Refer to Figure 14As shown, the wiper arm 10 includes a wiper blade 11 and an arm rod 12. The wiper blade 11 is disposed on the arm rod 12. The arm rod 12 is provided with a first connecting portion 13, and the first connecting portion 13 is connected to the driving device 30. The driving device 30 drives the arm rod 12 to perform a reciprocating rotational motion through the first connecting portion 13, thereby driving the wiper blade 11 to perform a reciprocating rotational motion. The function of the wiper blade 11 is to contact the glass of the vehicle and reciprocally wipe the glass under the drive of the reciprocating rotational motion.

[0052] See Figure 15 As shown, the housing 20 includes an upper cover 21 and a lower cover 22 assembled with the upper cover 21. An accommodation cavity is formed between the upper cover 21 and the lower cover 22 for accommodating at least part of the driving device 30, which can play a protective role for the driving device 30. The lower cover 22 is provided with a plurality of second connecting portions 23, and the lower cover 22 is connected to the vehicle through the second connecting portions 23 to realize the installation of the wiper on the vehicle. Optionally, a plug-in can be provided inside the housing for plugging into the vehicle's vehicle harness to provide power.

[0053] See Figure 3 、 Figure 6 and Figure 16 As shown, the driving device 30 includes a driving module 31, an output shaft 32, and a first transmission component.

[0054] Among them, the output shaft 32 is used to connect the driving target, and the output shaft 32 has a first axial direction X1. When the driving device 30 is applied to the wiper, the output shaft 32 is connected to the first connecting portion 13 of the wiper arm 10. The first transmission component 34 is connected to the output shaft 32. Optionally, at least part of the output shaft 32 passes through the upper cover 21 of the housing 20 and is connected to the first connecting portion 13 of the wiper arm 10.

[0055] The driving module 31 is connected to the first transmission component 34. The driving module 31 is used to drive the output shaft 32 to reciprocally rotate around the first axial direction X1 through the first transmission component 34, thereby driving the wiper arm 10 to perform a reciprocating rotational motion. When a squeezing force perpendicular to the first axial direction X1 occurs in the first transmission component 34, a lifting force along the first axial direction X1 is generated to enable the output shaft 32 to move along the first axial direction X1.

[0056] It can be understood that when the windshield wiper is in abusive working conditions such as dry scraping, the frictional force of the wiper arm will be too large. At this time, the first transmission component generates a squeezing force perpendicular to the first axial direction X1 and a lifting force along the first axial direction X1. The first transmission component can drive the output shaft to move along the first axial direction X1, thereby driving the wiper arm to lift, reducing the normal pressure between the wiper arm and the glass, thereby reducing the frictional force of the wiper arm, realizing the negative feedback of the frictional force received by the windshield wiper, realizing the adaptive windshield wiper structure that restricts the increase of the frictional force, and effectively improving the problems such as the speed reduction complaint and wear failure caused by the too large frictional force of the wiper arm due to abusive working conditions such as dry scraping of the windshield wiper.

[0057] Through the above settings, the driving device 30 provided by the present application can not only satisfy the reciprocating rotational movement of the output shaft 32, but also generate a lifting force along the first axial direction X1 when the first transmission component 34 generates a squeezing force perpendicular to the first axial direction X1, driving the output shaft 32 to move along the first axial direction X1, playing a lifting role on the output shaft 32, reducing the normal pressure between the wiper arm 10 and the glass, reducing the frictional force of the wiper arm, realizing the negative feedback of the frictional force received by the windshield wiper, and effectively improving the problems such as the speed reduction complaint and wear failure caused by the too large frictional force of the wiper arm due to abusive working conditions such as dry scraping of the windshield wiper.

[0058] It should be noted that the driving device 30 provided by the embodiment of the present application can be applied not only to the windshield wiper, but also to other structures. The output shaft 32 is used to connect the driving target, and can also play a lifting role on the driving target.

[0059] In some optional embodiments, the driving device 30 further includes an elastic member 33. The elastic member 33 is sleeved on the output shaft 32 and abuts against the output shaft 32 or the first transmission component 34, and the other end of the elastic member 33 abuts against the upper cover 21. In this way, the elastic member 33 is compressed between the upper cover 21 and the first transmission component 34 or the output shaft 32 with a certain pre-tightening force, and is used to generate an elastic force along the first axial direction X1 on the output shaft 32. The direction of the elastic force is opposite to the direction of the lifting force, so that the wiper arm 10 can press the glass of the vehicle with a certain pre-tightening force. Optionally, the elastic member 33 can be a spring or a damper, and preferably a one-way damper.

[0060] It can be understood that when the windshield wiper is in an abusive working condition such as dry scraping, it will cause excessive friction force on the wiper arm. At this time, the first transmission component generates a squeezing force perpendicular to the first axis X1 and a lifting force along the first axis X1. When the friction force of the wiper arm is large enough to make the lifting force generated by the first transmission component greater than the elastic force generated by the elastic component, the first transmission component can drive the output shaft to move along the first axis X1, thereby driving the wiper arm to lift, reducing the normal pressure between the wiper arm and the glass, thereby reducing the friction force of the wiper arm, realizing the negative feedback on the friction force received by the windshield wiper, realizing the self-adaptive windshield wiper structure that restricts the increase of the friction force, and effectively improving the problems such as the speed reduction complaint and wear failure caused by excessive friction force of the wiper arm due to abusive working conditions such as dry scraping of the windshield wiper.

[0061] See Figure 16 、 Figure 17 and Figure 18 As shown, in some alternative embodiments, the first transmission component 34 includes a shaft gear 341 and an arm gear 342, and the elastic component 33 abuts against the output shaft 32 or the shaft gear 341. The shaft gear 341 is fixedly connected to the first end of the output shaft 32 along the first axis X1 (as shown at the bottom in Figure 9 ), and the shaft gear 341 has a second axis, and the second axis is parallel to the first axis X1.

[0062] A plurality of protruding first wedge teeth 343 are provided on the outer periphery of the shaft gear 341, and the width of the first wedge teeth 343 gradually decreases along the second axis from the end of the shaft gear 341 close to the output shaft 32 to the end away from the output shaft 32, and the wedge angle is α, as shown in Figure 10 . It can be understood that by reducing this α angle, the friction force between the wiper arm and the glass can be increased, so that the critical value of the lifting force required for the output shaft to drive the wiper arm to lift is correspondingly increased, that is, the smaller the α, the greater the friction force required to cause lifting, and vice versa.

[0063] The arm gear 342 is connected to the drive module 31, and the arm gear 342 is provided with a plurality of second wedge teeth 344 adapted to the first wedge teeth 343, as shown in Figure 11 . The second wedge teeth 344 are engaged with the first wedge teeth 343, and the arm gear 342 has a third axis X2, and the third axis X2 is parallel to the second axis and is not coaxial. In this embodiment, the second axis is coaxial with the first axis X1.

[0064] The driving module 31 is used to drive the arm gear 342 to rotate around the third axial direction X2. Under the cooperation of the first wedge tooth 343 and the second wedge tooth 344, the shaft gear 341 is driven by the arm gear 342 to reciprocally rotate around the second axial direction, and the output shaft 32 is driven by the shaft gear 341 to reciprocally rotate around the first axial direction X1, thereby driving the wiper arm 10 to perform a reciprocating rotational motion.

[0065] In the initial state of the wiper, the wiper arm forms a positive pressure on the glass under the elastic force of the elastic member, and the dynamic friction coefficient is μ. When the wiper is in dry scraping or other working conditions, the dynamic friction coefficient μ will increase sharply, resulting in too large a frictional force on the wiper arm, causing a squeezing force N perpendicular to the second axial direction between the first wedge tooth 343 and the second wedge tooth 344, thereby generating a lifting force E along the first axial direction X1 between the first wedge tooth 343 and the second wedge tooth 344, and E = Ntan(0.5α).

[0066] Furthermore, when the frictional force of the wiper arm is large enough to make the lifting force E greater than the elastic force of the elastic member, the shaft gear 341 can be moved along the second axial direction, thereby driving the output shaft 32 to move along the first axial direction X1, lifting the wiper arm, reducing the positive pressure between the wiper arm and the glass, thereby reducing the frictional force of the wiper arm, realizing negative feedback on the frictional force received by the wiper, and effectively improving problems such as speed reduction complaints and wear failures caused by excessive frictional force of the wiper arm in dry scraping and other abusive working conditions of the wiper. After the frictional force between the wiper arm and the glass is reduced through the above adaptive adjustment, the lifting force also decreases accordingly. When the lifting force is less than the elastic force of the elastic member, the output shaft and the wiper arm are reset to the initial state under the elastic restoring force of the elastic member.

[0067] It can be understood that increasing the elastic force of the elastic member can increase the frictional force between the wiper arm and the glass, so that the critical value of the lifting force required for the output shaft to drive the wiper arm to lift increases accordingly, that is, the greater the elastic force of the elastic member, the greater the frictional force required for lifting, and vice versa.

[0068] Combined with Figure 18As shown, the arm gear 342 includes a rotating part 345, a connecting rod 346, and a gear part 347. The connecting rod 346 is connected between the rotating part 345 and the gear part 347. The rotating part 345 has the third axial direction X2 and is connected to the driving module 31. The gear part 347 is provided with the second wedge teeth 344. Optionally, the rotating part 345, the connecting rod 346, and the gear part 347 are integrally formed. The driving module 31 is used to drive the rotating part 345 to rotate around the third axial direction X2, drive the gear part 347 to rotate synchronously, and then drive the shaft gear 341 to reciprocally rotate around the second axial direction. The shaft gear 341 drives the output shaft 32 to reciprocally rotate around the first axial direction X1, driving the scraping arm 10 to reciprocally rotate.

[0069] See Figure 16 As shown, in some alternative embodiments, the driving module 31 includes a driving member 311 and a second transmission component connected to the driving member 311. The second transmission component is connected to the arm gear 342. The driving member 311 is used to drive the arm gear 342 to rotate around the third axial direction X2 through the second transmission component. Optionally, the driving member 311 is a motor.

[0070] Further, see Figure 16 、 Figure 19 and Figure 20 As shown, the second transmission component includes a first transmission member 312 and a second transmission member 313. The first transmission member 312 is connected to the driving member 311. The second transmission member 313 is connected to the first transmission member 312. The arm gear 342 is rotatably connected to the second transmission member 313. The first transmission member 312 has a fourth axial direction X3. The second transmission member 313 has a fifth axial direction X4. The fifth axial direction X4 is parallel to the third axial direction X2 and non - coaxial. The fourth axial direction X3 is perpendicular to the fifth axial direction X4.

[0071] The driving member 311 is used to drive the first transmission member 312 to rotate around the fourth axial direction X3, drive the second transmission member 313 to rotate around the fifth axial direction X4 through the first transmission member 312, so that the second transmission member 313 drives the arm gear 342 to rotate around the third axial direction X2.

[0072] Optionally, the first transmission member 312 is a worm, and the second transmission member 313 is a worm gear. It should be noted that the first transmission member 312 and the second transmission member 313 can also be other mechanical components that can be used to transmit motion and power between two intersecting axes. The motor, worm gear, worm, plug, and output shaft can be integrated on the upper cover. The motor and the worm can provide power. The worm meshes with the worm gear to achieve speed reduction and torque increase.

[0073] Continue to refer to Figure 16 As shown, the driving module 31 further includes a first pin shaft 314 and a second pin shaft 315. The first pin shaft 314 is arranged along the fifth axial direction X4. The second transmission member 313 is rotatably sleeved on the first pin shaft 314. The first pin shaft 314 enables the second transmission member 313 to have and only have the rotational freedom around the first pin shaft 314, and provides the main supporting force for the arm gear 342. The second pin shaft 315 is arranged along the third axial direction X2. The second pin shaft 315 is fixedly connected to the second transmission member 313. The arm gear 342 is rotatably sleeved on the second pin shaft 315, and the arm gear 342 has and only has the rotational freedom around the second pin shaft 315.

[0074] Refer to Figure 16 and Figure 20 As shown, the second transmission member 313 is in a hollow ring shape. The inner wall of the second transmission member 313 is provided with a first extension portion 316, and the outer wall of the first extension portion 316 is provided with a second extension portion 317. The first extension portion 316 is provided with a first shaft hole 3161, and the first shaft hole 3161 is arranged along the third axial direction X2. The second extension portion 317 is provided with a second shaft hole 3171, and the second shaft hole 3171 is arranged along the fifth axial direction X4. The first pin shaft 314 is movably arranged in the second shaft hole 3171, and the second pin shaft 315 is fixedly arranged in the first shaft hole 3161.

[0075] The driving member 311 is used to drive the first transmission member 312 to rotate around the fourth axial direction X3. Through the first transmission member 312, the second transmission member 313 is driven to rotate around the fifth axial direction X4 relative to the first pin shaft 314. The second pin shaft 315 rotates synchronously with the second transmission member 313. Thus, through the second transmission member 313, the arm gear 342 rotates around the third axial direction X2 relative to the second pin shaft 315.

[0076] Further, refer to Figure 8 and Figure 16 As shown, a washer 318 can be arranged between the second transmission member 313 and the arm gear 342. The second transmission member 313 is in contact with and slidably connected to the washer 318. The washer 318 can be made of a material with high strength and low dynamic friction coefficient, such as TPFE. Its function is to reduce friction, wear and noise when the arm gear rotates around the second pin shaft.

[0077] A slide rail 319 can be arranged between the second pin shaft 315 and the lower cover 22. The slide rail 319 and the lower cover 22 can be fixedly arranged. The slide rail 319 is a circular track and can be made of a material with high strength and low dynamic friction coefficient, such as TPFE. Its function is to provide auxiliary supporting force for the arm gear 342 through sliding contact with the second pin shaft 315.

[0078] See Figures 21 to 24 As shown, the movement principle among the first transmission member 312, the second transmission member 313, the arm gear 342, and the shaft gear 341 is as follows:

[0079] As shown in the figure, the coordinates of point P are (X P , Y P ), which are

[0080] X P = Tsinγ………………………………(1)

[0081] Y P = Tcosγ………………………………(2)

[0082] The coordinates of point C are (X C , Y C ). Then, the coordinates of point S are (X S , Y S ), which are

[0083] X S = X C + Rsinθ………………………………(3)

[0084] Y S = Y C + Rcosθ………………………………(4)

[0085] SP = [(X P - X S ) 2 + (Y P - Y S ) 2 0.5 ………………………………(5)

[0086] Wherein, T is the distance between the second axial direction of the shaft gear 341 and the third axial direction of the arm gear 342. R is the radius of the second transmission member 313. Point C is the center of the second transmission member 313. Point S is the center of the rotating part 345 of the arm gear 342. Point O is the center of the shaft gear 341. Point P is the center of the gear part 347 of the arm gear 342. θ is the rotation angle of point S around point C. γ is the rotation angle of point P around point O.

[0087] In this embodiment, T = 20, R = 13, XC = 30, YC = 19, and SP = 32 are constants. X P , Y P , X S , Y S , θ, and γ are variables. Through the above 5 equations, the relationship between θ and γ can be obtained as shown in Table 1 below. ​

[0088]

[0089] Table 1

[0090] Combined Figure 25 As shown in Table 1 above, when point S rotates clockwise around point C by θ = 81 degrees, point P rotates clockwise around point O by γ = 35.6 degrees to reach the clockwise farthest end (as shown in Figure 24 ), when point S continues to rotate clockwise around point C, point P immediately changes its direction to counterclockwise rotation;

[0091] When point S rotates clockwise around point C by θ = 263 degrees, point P rotates counterclockwise around point O by γ = -45.6 degrees to reach the counterclockwise farthest end (as shown in Figure 22 ), when point S continues to rotate clockwise around point C, point P immediately changes its direction to clockwise rotation;

[0092] When point S rotates clockwise around point C by θ = (81 + 360) degrees, point P rotates clockwise around point O by γ = 35.6 degrees to reach the clockwise farthest end. When point S continues to rotate clockwise around point C, point P immediately changes its direction to counterclockwise rotation; the above completes one cycle, and as θ continues to increase, it repeats.

[0093] In some alternative embodiments, the driving device 30 may further include a controller, electrically connected to the driving module 31. The reciprocating rotational movement of the arm gear 342 includes an intermediate position and two extreme positions. The two extreme positions can be understood as the positions of the arm gear when point P rotates around point O to the clockwise farthest end and the counterclockwise farthest end. The intermediate position can be understood as the position corresponding to the exact middle of the two extreme positions.

[0094] The controller is used to perform at least one of the following:

[0095] During the process of the arm gear 342 moving from the intermediate position to any one of the extreme positions, control the driving module 31 to gradually decelerate the arm gear 342.

[0096] During the process of the arm gear 342 moving from any one of the extreme positions to the intermediate position, control the driving module 31 to gradually accelerate the arm gear 342.

[0097] It can be understood that the controller has a PWM function and takes the derivative of the speed of γ. When θ = (81 + 360n) degrees, i.e., γ = 35.6 degrees, or θ = (263 + 360n) degrees, i.e., γ = -45.6 degrees, where n is a natural number. The acceleration of γ is the extreme point of the whole process. Near the two extreme points (corresponding to the two limit positions) of each cycle, the arm gear and the shaft gear may have the phenomenon of changing from contact to force separation and then re - contact, that is, "commutation jump" occurs. Through the above - mentioned speed change control law, near these two extreme points of each cycle, through the speed regulation function of the controller, when the scraping arm approaches the commutation position, it gradually decelerates, and when the scraping arm moves away from the commutation position, it gradually accelerates. This can play a role in the smoothness of the scraping arm commutation, realize the smoothness of the scraping arm commutation, and avoid the commutation jump of the arm gear at the two limit positions. As Figure 26 shown, the blue curve in the figure is the scheme without setting the controller, and the orange curve is the scheme with the controller set. It can be seen that in the scheme with the controller set, the speed of γ transitions smoothly from ≠0 to =0 throughout the process without mutation points (the speed is differentiable throughout the process).

[0098] It should be noted that the technical solutions or technical features described in the above embodiments can be combined or supplemented with each other without conflict. The scope of protection of this application is not limited to the precise structures described in the above embodiments and shown in the drawings; all modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included within the scope of protection of this application.

Claims

1. A driving device, characterized in that, Comprising: An output shaft for connecting to a driven target, the output shaft having a first axial direction; A first transmission assembly connected to the output shaft; A drive module connected to the first transmission assembly, the drive module being configured to drive the output shaft to reciprocally rotate about the first axial direction through the first transmission assembly; when a squeezing force perpendicular to the first axial direction occurs in the first transmission assembly, a lifting force along the first axial direction is generated to move the output shaft along the first axial direction.

2. The drive device according to claim 1, characterized in that, The first transmission assembly includes a shaft gear and an arm gear. The shaft gear is fixedly connected to a first end of the output shaft along the first axial direction. The shaft gear has a second axial direction, and the second axial direction is parallel to the first axial direction. A plurality of protruding first wedge teeth are provided on the outer periphery of the shaft gear, and the width of the first wedge teeth gradually decreases along the second axial direction from one end of the shaft gear close to the output shaft to the end away from the output shaft. The arm gear is connected to the drive module, and the arm gear is provided with a plurality of second wedge teeth adapted to the first wedge teeth. The second wedge teeth are engaged with the first wedge teeth. The arm gear has a third axial direction, and the third axial direction is parallel to and non-coaxial with the second axial direction; The drive module is configured to drive the arm gear to rotate about the third axial direction, drive the shaft gear to reciprocally rotate about the second axial direction through the arm gear, and the shaft gear drives the output shaft to reciprocally rotate about the first axial direction; when a squeezing force perpendicular to the second axial direction occurs between the first wedge teeth and the second wedge teeth, the lifting force is generated therebetween to move the shaft gear along the second axial direction, thereby driving the output shaft to move along the first axial direction.

3. The drive device according to claim 2, characterized in that, The arm gear includes a rotating portion, a connecting rod, and a gear portion. The connecting rod is connected between the rotating portion and the gear portion. The rotating portion has the third axial direction and is connected to the drive module, and the gear portion is provided with the second wedge teeth.

4. The drive device according to claim 2, characterized in that, The drive module includes a driving member and a second transmission assembly connected to the driving member. The second transmission assembly is connected to the arm gear. The driving member is configured to drive the arm gear to rotate about the third axial direction through the second transmission assembly.

5. The drive device according to claim 4, characterized in that, The second transmission assembly includes a first transmission member and a second transmission member. The first transmission member is connected to the driving member, the second transmission member is connected to the first transmission member, and the arm gear is rotatably connected to the second transmission member. The first transmission member has a fourth axial direction, the second transmission member has a fifth axial direction, the fifth axial direction is parallel to and non-coaxial with the third axial direction, and the fourth axial direction is perpendicular to the fifth axial direction; The driving member is configured to drive the first transmission member to rotate about the fourth axial direction, drive the second transmission member to rotate about the fifth axial direction through the first transmission member, and the second transmission member drives the arm gear to rotate about the third axial direction.

6. The drive device according to claim 5, characterized in that, The driving module further includes a first pin shaft and a second pin shaft. The first pin shaft is arranged along the fifth axial direction, and the second transmission member is rotatably sleeved on the first pin shaft. The second pin shaft is arranged along the third axial direction, the second pin shaft is fixedly connected to the second transmission member, and the arm gear is rotatably sleeved on the second pin shaft.

7. The drive device according to claim 6, characterized in that, The second transmission member is in a hollow ring shape. The inner wall of the second transmission member is provided with a first extension portion, and the outer wall of the first extension portion is provided with a second extension portion. A first shaft hole is formed in the first extension portion, and the first shaft hole is arranged along the third axial direction. A second shaft hole is formed in the second extension portion, and the second shaft hole is arranged along the fifth axial direction. The first pin shaft is movably arranged in the second shaft hole, and the second pin shaft is fixedly arranged in the first shaft hole.

8. The drive device according to claim 5, characterized in that, The first transmission member is a worm, and the second transmission member is a worm wheel.

9. The drive device according to claim 2, characterized in that, It further includes a controller, which is electrically connected to the driving module. The reciprocating rotational movement of the arm gear includes an intermediate position and two limit positions. The controller is configured to perform at least one of the following: During the process of the arm gear moving from the intermediate position to any one of the limit positions, controlling the driving module to gradually decelerate the arm gear. During the process of the arm gear moving from any one of the limit positions to the intermediate position, controlling the driving module to gradually accelerate the arm gear.

10. The drive device according to claim 1, characterized in that, It further includes an elastic member, which is sleeved on the output shaft and abuts against the output shaft or the first transmission assembly, and is used to generate an elastic force along the first axial direction on the output shaft. The direction of the elastic force is opposite to the direction of the lifting force. When the lifting force is greater than the elastic force, the output shaft moves along the first axial direction.

11. A windshield wiper, characterized in that, It includes a scraping arm, a housing, and a driving device as described in any one of claims 1-10. At least part of the driving device is arranged in the housing, and the scraping arm is connected to the driving device.

12. A vehicle, characterized in that, It includes a vehicle body and a windshield wiper as described in claim 11. The windshield wiper is installed on the vehicle body.

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