Brake device and vehicle

Abstract

The utility model belongs to the technical field of braking, and discloses a braking device and a vehicle. According to the braking device, the elastic adjusting structure is arranged between the limiting structure and the limiting part of the shell. In the axial direction of the lead screw, the elastic restoring force of the elastic adjusting structure can drive the limiting structure to be away from the friction plate structure in the axial direction of the lead screw, and the two ends of the force transmission structure can abut against the first stress face of the limiting part and the second stress face of the lead screw correspondingly. The limiting structure is an output end of the transmission mechanism or a lead screw. At least the part, making contact with the limiting structure, of the elastic adjusting structure can synchronously rotate along with the limiting structure. Therefore, the phenomenon that a friction plate structure drags a brake disc in a non-braking state in the prior art can be avoided, the phenomenon that the distribution positions of a force transmission structure and a ball screw mechanism in the axial direction of a lead screw are not fixed due to abrasion in the operation process can be avoided, and the phenomenon that a lubricating pad and / or a compression spring are / is replaced in the prior art can be avoided. And the working stability, the braking precision and the service life of the braking device are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of braking, in particular to a braking device and a vehicle. Background Art

[0002] A brake is a device that has functions such as decelerating, stopping, or maintaining a stopped state of a moving part or a moving machine. Brakes include hydraulic brakes and electronic brakes. For an electronic brake, by increasing the power, current, or transmission parameters of a motor, etc., the pressure transmitted from a piston cylinder to a brake disc can be increased. Therefore, electronic brakes are widely used. Among them, an electronic brake mainly consists of a motor, a transmission mechanism, a ball screw mechanism, and two friction plate structures, etc. The motor drives the transmission mechanism to move, driving a screw rod or a nut in the ball screw mechanism to move axially, thereby driving one of the friction plate structures to move axially along the screw rod, so that the friction plate structure can approach or move away from the other friction plate structure to achieve braking or release of braking.

[0003] Currently, in the prior art, in order to improve the working performance and service life of an electronic brake, an axial limiting member is provided on the screw rod, a cage is provided on a housing, the cage is sleeved on the screw rod, and one end of the cage in the axial direction is inserted into the housing, and a part of the other end provided with a lubricating pad abuts against the axial limiting member; secondly, a spring is provided between the housing and the cage, and an axial force is applied to the cage through the spring, thereby applying an axial force to the screw rod. So that in the non-braking state, it can avoid the friction plate structure from dragging the brake disc, and can apply an axial force to the screw rod so that the screw rod and the nut can remain relatively stationary. However, in the above method of adjusting the clearance, since the axial limiting member has to rotate relative to the cage, even if a lubricating pad is provided between the axial limiting member and the cage, after long-term operation, there is a phenomenon that the lubricating pad is worn through or even the compression spring is worn, resulting in poor working performance and short service life. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a braking device and a vehicle to solve the above problems existing in the electronic brake in the prior art.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A braking device, comprising a housing, a transmission mechanism, a ball screw mechanism, a force transmission structure, a piston structure, and a friction plate structure. The ball screw mechanism includes a cooperating screw rod and a nut. The output end of the transmission mechanism is fixedly connected to the screw rod and can drive the screw rod to rotate around its own central axis. The nut is also fixedly connected to the piston structure, and the nut can drive the piston structure to approach or move away from the friction plate structure along the axial direction of the screw rod; the force transmission structure is sleeved on the screw rod; the braking device further includes an elastic adjustment structure;

[0007] The elastic adjustment structure is disposed between the limiting structure and the limiting portion of the housing; along the axial direction of the lead screw, the elastic restoring force of the elastic adjustment structure can drive the limiting structure to move away from the friction plate structure along the axial direction of the lead screw, and both ends of the force transmission structure can respectively abut against the first stress surface of the limiting portion and the second stress surface of the lead screw; the limiting structure is the output end of the transmission mechanism or the lead screw;

[0008] At least a part of the elastic adjustment structure that contacts the limiting structure can rotate synchronously with the limiting structure.

[0009] As a preferred solution of the above braking device, the elastic adjustment structure includes an elastic member and a first bearing. The outer ring of the first bearing is fixedly disposed on the limiting portion, and the inner ring of the first bearing is in clearance fit with the limiting structure;

[0010] Along the axial direction of the lead screw, one end of the elastic member is elastically abutted or fixedly connected to the inner ring of the first bearing, and the other end is elastically abutted or fixedly connected to the limiting structure.

[0011] As a preferred solution of the above braking device, an installation groove is recessed on the end surface of the limiting portion away from the first stress surface along the axial direction of the lead screw. At least a part of the first bearing is located in the installation groove, and the outer ring of the first bearing is fixedly connected to the inner peripheral wall of the installation groove.

[0012] As a preferred solution of the above braking device, the output end of the transmission mechanism axially passes through the first bearing partially along the axial direction of the lead screw.

[0013] As a preferred solution of the above braking device, the elastic adjustment structure includes an elastic member and a first bearing. The inner ring of the first bearing is fixedly sleeved on the limiting structure, and the outer ring of the first bearing is in clearance fit with the limiting portion;

[0014] Along the axial direction of the lead screw, one end of the elastic member is elastically abutted or fixedly connected to the outer ring of the first bearing, and the other end is elastically abutted or fixedly connected to the limiting portion.

[0015] As a preferred solution of the above braking device, the elastic member is a conical spring, and the large end of the conical spring is farther from the first bearing than the small end of the conical spring.

[0016] As a preferred solution of the above braking device, a first protection boss is further provided on the limiting structure and / or the limiting portion. The first protection boss is located on the outer periphery of the elastic member; the first protection boss is used to axially abut against the limiting structure and / or the limiting portion along the axial direction of the lead screw.

[0017] As a preferred solution of the above braking device, the lead screw is axially concavely provided with a receiving space, and the bottom surface of the receiving space is the second stress surface; at least part of the force transmission structure is received in the receiving space.

[0018] As a preferred solution of the above braking device, one end surface of the force transmission structure close to the second stress surface is a spherical end surface, and the second stress surface is also a spherical end surface, and the two spherical end surfaces are in surface contact.

[0019] As a preferred solution of the above braking device, the force transmission structure includes a first force transmission gasket, a second bearing and a second force transmission gasket sleeved on the lead screw along the axis. The first force transmission gasket axially abuts against the second stress surface, and the second force transmission gasket axially abuts against the first stress surface.

[0020] As a preferred solution of the above braking device, the force transmission structure includes a first force transmission gasket, a second bearing, a second force transmission gasket and a force sensor sleeved on the lead screw along the axis. The first force transmission gasket axially abuts against the second stress surface, and the force sensor axially abuts against the first stress surface.

[0021] As a preferred solution of the above braking device, the piston structure includes a piston cover and a force application disc. The nut is connected to the piston cover, and the force application disc is movably connected to the piston cover. The force application disc can contact or separate from the friction plate structure.

[0022] As a preferred solution of the above braking device, the end surface of the force application disc close to the friction plate structure is concavely provided with a cavity.

[0023] A vehicle, including the above braking device.

[0024] The beneficial effects of the present utility model:

[0025] The utility model provides a braking device and a vehicle. The braking device includes a housing, a transmission mechanism, a ball screw mechanism, a force transmission structure, a piston structure and a friction plate structure. The ball screw mechanism includes a matching lead screw and a nut. The output end of the transmission mechanism is fixedly connected to the lead screw and can drive the lead screw to rotate around its own central axis. The nut is also fixedly connected to the piston structure, and the nut can drive the piston structure to approach or move away from the friction plate structure along the axial direction of the lead screw. The force transmission structure is sleeved on the lead screw. The braking device further includes an elastic adjustment structure. The elastic adjustment structure is arranged between the limiting structure and the limiting part of the housing. Along the axial direction of the lead screw, the elastic restoring force of the elastic adjustment structure can drive the limiting structure to move away from the friction plate structure along the axial direction of the lead screw, and both ends of the force transmission structure can respectively abut against the first stress surface of the limiting part and the second stress surface of the lead screw. The limiting structure is the output end of the transmission mechanism or the lead screw. At least the part of the elastic adjustment structure in contact with the limiting structure can rotate synchronously with the limiting structure.

[0026] It can be understood that the elastic adjustment structure itself has the ability of elastic deformation. The elastic adjustment structure can be arranged between the output end of the transmission mechanism and the limiting part of the housing. The elastic adjustment structure can also be arranged between the lead screw and the limiting part of the housing.

[0027] When the braking device is in a non-braking state, the elastic restoring force of the elastic adjustment structure drives the limiting structure to move away from the friction plate structure along the axial direction of the lead screw. Since the output end of the transmission mechanism is fixedly connected to the lead screw and the nut is also fixedly connected to the piston structure, the ball screw mechanism and the piston structure are driven to move away from the friction plate structure synchronously, so as to effectively avoid the phenomenon that the friction plate structure drags the brake disc in the prior art and reduce the energy consumption. Secondly, in the process of driving the ball screw mechanism to move away from the friction plate structure along the axial direction of the lead screw, the lead screw approaches the force transmission structure, so that both ends of the force transmission structure can respectively abut tightly against the first stress surface of the housing and the second stress surface of the lead screw. After both ends of the force transmission structure respectively abut tightly against the first stress surface of the housing and the second stress surface of the lead screw, under the action of the elastic restoring force of the elastic adjustment structure, the lead screw maintains a state of applying an axial force to the force transmission structure, so as to effectively avoid the phenomenon that the distribution positions of the force transmission structure and the ball screw mechanism along the axial direction of the lead screw are not fixed in the non-braking state.

[0028] When the braking device is in the braking state, the output end of the transmission mechanism drives the lead screw to rotate around its own central axis, so that the nut drives the piston structure to approach or move away from the friction plate structure to achieve braking or release of braking. Among them, since at least the part of the elastic adjustment structure in contact with the limit structure can rotate synchronously with the limit structure, there is no mutual friction between the elastic adjustment structure and the limit structure, and between the elastic adjustment structure and the limit part. Therefore, even after the long-term operation of the braking device, it will not cause wear to the elastic adjustment structure and / or the limit structure and / or the limit part, thus effectively avoiding the phenomenon in the prior art that the distribution positions of the force transmission structure and the ball screw mechanism along the axial direction of the lead screw are not fixed due to mutual wear, and avoiding the phenomenon of frequently replacing the lubricating pad and / or the compression spring in the prior art, and effectively improving the working stability and braking accuracy of the braking device.

[0029] Therefore, when the braking device is in the non-braking state, it can effectively avoid the phenomenon in the prior art that the friction plate structure drags the brake disc, and can effectively avoid the phenomenon that the distribution positions of the force transmission structure and the ball screw mechanism along the axial direction of the lead screw are not fixed; secondly, even if the braking device operates for a long time, it can effectively avoid the phenomenon that the distribution positions of the force transmission structure and the ball screw mechanism along the axial direction of the lead screw are not fixed due to wear, avoid the phenomenon of frequently replacing the lubricating pad and / or the compression spring in the prior art, and effectively improve the working stability, braking accuracy and service life of the braking device. Description of the Drawings

[0030] Figure 1 is a schematic structural diagram of the braking device provided by the specific embodiment of the present invention;

[0031] Figure 2 is a partial cross-section of the braking device provided by the specific embodiment of the present invention Figure 1 ;

[0032] Figure 3 is a partial cross-section of the braking device provided by the specific embodiment of the present invention Figure 2 ;

[0033] Figure 4 is a partial cross-sectional view of the braking device provided by another embodiment of the present invention;

[0034] Figure 5 is a cross-sectional view of the lead screw of the braking device provided by the specific embodiment of the present invention;

[0035] Figure 6 is a schematic structural diagram of the elastic member of the braking device provided by the specific embodiment of the present invention;

[0036] Figure 7It is a schematic structural diagram of the output end of the transmission mechanism of the braking device provided by a specific embodiment of the present utility model.

[0037] In the figure:

[0038] 1. Housing; 11. Limiting part; 111. First stress surface; 12. Sliding cavity;

[0039] 2. Output end of the transmission mechanism; 21. First protection boss;

[0040] 3. Ball screw mechanism; 31. Screw rod; 311. Accommodation space; 3111. Second stress surface; 312. Weight reduction cavity; 313. Second protection boss; 32. Nut;

[0041] 4. Force transmission structure; 41. Force sensor; 42. Second force transmission gasket; 43. Second bearing; 44. First force transmission gasket;

[0042] 5. Piston structure; 51. Piston cover; 52. Force application disc; 521. Concave cavity;

[0043] 6. Friction plate structure; 61. Inner friction plate structure; 62. Outer friction plate structure;

[0044] 7. Elastic adjustment structure; 71. Elastic member; 72. First bearing;

[0045] 8. Dust cover;

[0046] 9. Bracket. Specific embodiments

[0047] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only parts related to the present utility model are shown in the drawings, rather than all the structures.

[0048] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0049] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0050] In the description of this embodiment, the orientation or positional relationships such as "upper", "lower", "right", etc. are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0051] The present utility model provides a braking device, as Figures 1 - 3 shown. The braking device includes a housing 1, a transmission mechanism, a ball screw mechanism 3, a force transmission structure 4, a piston structure 5 and a friction plate structure 6. The ball screw mechanism 3 includes a cooperating lead screw 31 and a nut 32. The output end 2 of the transmission mechanism is fixedly connected to the lead screw 31 and can drive the lead screw 31 to rotate about its own central axis. The nut 32 is also fixedly connected to the piston structure 5, and the nut 32 can drive the piston structure 5 to approach or move away from the friction plate structure 6 along the axial direction of the lead screw 31. The force transmission structure 4 is sleeved on the lead screw 31.

[0052] Specifically, the braking device further includes a driving member, and the driving member and the lead screw 31 are in transmission connection through the transmission mechanism, so as to be able to drive the lead screw 31 to rotate about its own central axis. In this embodiment, the driving member is a motor.

[0053] Specifically, the transmission mechanism is a gear transmission mechanism. It can be understood that the specific structure of the transmission mechanism can be adaptively adjusted according to the actual working conditions, as long as the output end 2 of the transmission mechanism is fixedly connected to the lead screw 31 and can drive the lead screw 31 to rotate about its own central axis.

[0054] Among them, as Figures 2 - 4As shown, the braking device further includes an elastic adjustment structure 7. The elastic adjustment structure 7 is disposed between the limiting structure and the limiting portion 11 of the housing 1. Along the axial direction of the lead screw 31, the elastic restoring force of the elastic adjustment structure 7 can drive the limiting structure to move away from the friction plate structure 6 along the axial direction of the lead screw 31, and both ends of the force transmission structure 4 can respectively abut against the first force-receiving surface 111 of the limiting portion 11 and the second force-receiving surface 3111 of the lead screw 31. The limiting structure is the output end 2 of the transmission mechanism or the lead screw 31. At least the part of the elastic adjustment structure 7 in contact with the limiting structure can rotate synchronously with the limiting structure.

[0055] It can be understood that the elastic adjustment structure 7 itself has the ability of elastic deformation. The elastic adjustment structure 7 can be disposed between the output end 2 of the transmission mechanism and the limiting portion 11 of the housing 1. The elastic adjustment structure 7 can also be disposed between the lead screw 31 and the limiting portion 11 of the housing 1.

[0056] When the braking device is in a non-braking state, the elastic restoring force of the elastic adjustment structure 7 drives the limiting structure to move away from the friction plate structure 6 along the axial direction of the lead screw 31. Since the output end 2 of the transmission mechanism is fixedly connected to the lead screw 31, and the nut 32 is also fixedly connected to the piston structure 5, the ball screw mechanism 3 and the piston structure 5 are driven to move away from the friction plate structure 6 synchronously, so as to effectively avoid the phenomenon that the friction plate structure drags the brake disc in the prior art and reduce the energy consumption. Secondly, during the process of driving the ball screw mechanism 3 to move away from the friction plate structure 6 along the axial direction of the lead screw 31, the lead screw 31 approaches the force transmission structure 4, so that both ends of the force transmission structure 4 can respectively abut tightly against the first force-receiving surface 111 of the housing 1 and the second force-receiving surface 3111 of the lead screw 31. After both ends of the force transmission structure 4 respectively abut tightly against the first force-receiving surface 111 of the housing 1 and the second force-receiving surface 3111 of the lead screw 31, under the action of the elastic restoring force of the elastic adjustment structure 7, the lead screw 31 maintains a state of applying an axial force to the force transmission structure 4, so as to effectively avoid the phenomenon that the distribution positions of the force sensor 41 and the ball screw mechanism 3 along the axial direction of the lead screw 31 are not fixed in the non-braking state, and can effectively avoid the phenomenon that the monitoring result of the force transmission structure 4 is inaccurate.

[0057] When the braking device is in the braking state, the output end 2 of the transmission mechanism drives the lead screw 31 to rotate around its own central axis, so that the nut 32 drives the piston structure 5 to approach or move away from the friction plate structure 6 to achieve braking or release of braking. Among them, since at least the part of the elastic adjustment structure 7 in contact with the limit structure can rotate synchronously with the limit structure, there is no mutual friction between the elastic adjustment structure 7 and the limit structure, and between the elastic adjustment structure 7 and the limit part 11. Therefore, even after the long-term operation of the braking device, it will not cause wear to the elastic adjustment structure 7 and / or the limit structure and / or the limit part 11, thus effectively avoiding the phenomenon in the prior art that the distribution positions of the force transmission structure 4 and the ball screw mechanism 3 along the axial direction of the lead screw 31 are not fixed due to mutual wear, and avoiding the phenomenon of frequently replacing lubricating pads and / or compression springs in the prior art, and effectively improving the working stability and braking accuracy of the braking device.

[0058] Therefore, when the braking device is in the non-braking state, it can effectively avoid the phenomenon in the prior art that the friction plate structure drags the brake disc, and can effectively avoid the phenomenon that the distribution positions of the force transmission structure 4 and the ball screw mechanism 3 along the axial direction of the lead screw 31 are not fixed; secondly, even if the braking device runs for a long time, it can effectively avoid the phenomenon that the distribution positions of the force transmission structure 4 and the ball screw mechanism 3 along the axial direction of the lead screw 31 are not fixed due to wear, avoid the phenomenon of frequently replacing lubricating pads and / or compression springs in the prior art, and effectively improve the working stability, braking accuracy and service life of the braking device.

[0059] Among them, as Figures 2 - 4 shown, the elastic adjustment structure 7 includes an elastic member 71 and a first bearing 72. Compared with the prior art, the elastic adjustment structure 7 has a simple structure and few components, and can effectively reduce the axial length of the lead screw 31, thereby effectively reducing the volume and weight of the braking device.

[0060] Specifically, as Figure 2 and Figure 3 shown, the outer ring of the first bearing 72 is fixedly arranged on the limit part 11, and the inner ring of the first bearing 72 is in clearance fit with the limit structure. Along the axial direction of the lead screw 31, one end of the elastic member 71 elastically abuts against or is fixedly connected to the inner ring of the first bearing 72, and the other end elastically abuts against or is fixedly connected to the limit structure. It can be understood that the inner ring of the first bearing 72 is in clearance fit with the lead screw 31 and in clearance fit with the output end 2 of the transmission mechanism. The other end of the elastic member 71 elastically abuts against or is fixedly connected to the output end 2 of the transmission mechanism. Or, the other end of the elastic member 71 elastically abuts against or is fixedly connected to the lead screw 31.

[0061] When the braking device is in a non-braking state, the elastic restoring force of the elastic member 71 drives the output end 2 of the transmission mechanism and the lead screw 31 to synchronously move away from the friction plate structure 6 along the axial direction of the lead screw 31. The lead screw 31 approaches the force transmission structure 4, so that both ends of the force transmission structure 4 can respectively abut against the first stress surface 111 of the housing 1 and the second stress surface 3111 of the lead screw 31. When both ends of the force transmission structure 4 respectively abut against the first stress surface 111 of the housing 1 and the second stress surface 3111 of the lead screw 31, under the action of the elastic restoring force of the elastic member 71, the lead screw 31 maintains a state of applying an axial force to the force transmission structure 4, thereby effectively avoiding the phenomenon that the distribution positions of the force transmission structure 4 and the ball screw mechanism 3 along the axial direction of the lead screw 31 are not fixed in the non-braking state.

[0062] When the braking device is in a braking state, during the process of the output end 2 of the transmission mechanism rotating around its own central axis, it drives the elastic member 71 to synchronously rotate around the central axis of the lead screw 31, and drives the inner ring of the first bearing 72 to rotate relative to the outer ring of the first bearing 72, thereby effectively avoiding the phenomenon that the distribution positions of the force transmission structure 4 and the ball screw mechanism 3 along the axial direction of the lead screw 31 are not fixed due to mutual wear in the prior art.

[0063] Preferably, as Figures 2 - 4 shown, in this embodiment, the output end 2 of the transmission mechanism is fixedly connected to the axial end of the lead screw 31. The other end of the elastic member 71 elastically abuts against or is fixedly connected to the output end 2 of the transmission mechanism. With such a setting, the span of the braking device along the axial direction of the lead screw 31 can be effectively reduced, thereby further reducing the volume of the braking device.

[0064] Preferably, as Figure 2 and Figure 3 shown, in this embodiment, the limiting portion 11 is recessed with an installation groove on the end face away from the first stress surface 111 along the axial direction of the lead screw 31. At least part of the first bearing 72 is located in the installation groove, and the outer ring of the first bearing 72 is fixedly connected to the inner peripheral wall of the installation groove. With such a setting, the span of the braking device along the axial direction of the lead screw 31 can be further reduced to further reduce the volume and weight of the braking device. In this embodiment, it is preferably that the first bearing 72 is completely located in the installation groove along the axial direction.

[0065] Further preferably, as Figure 2 and Figure 3 shown, in this embodiment, the output end 2 of the transmission mechanism axially passes through the first bearing 72 partially. With such a setting, the span of the braking device along the axial direction of the lead screw 31 can be further reduced to further reduce the volume and weight of the braking device.

[0066] As an alternative solution, as Figure 4As shown, the inner ring of the first bearing 72 is fixedly sleeved on the limiting structure, and the outer ring of the first bearing 72 is in clearance fit with the limiting portion 11. Along the axial direction of the lead screw 31, one end of the elastic member 71 elastically abuts against or is fixedly connected to the outer ring of the first bearing 72, and the other end elastically abuts against or is fixedly connected to the limiting portion 11. It can be understood that the inner ring of the first bearing 72 is fixedly sleeved on the output end 2 of the transmission mechanism. Or, the inner ring of the first bearing 72 is fixedly sleeved on the lead screw 31.

[0067] When the braking device is in the non-braking state, the elastic restoring force of the elastic member 71 drives the output end 2 of the transmission mechanism, the first bearing 72 and the lead screw 31 to synchronously move away from the friction plate structure 6 along the axial direction of the lead screw 31, and the lead screw 31 approaches the force transmission structure 4, so that both ends of the force transmission structure 4 can respectively abut against the first stress surface 111 of the housing 1 and the second stress surface 3111 of the lead screw 31. After both ends of the force transmission structure 4 respectively abut against the first stress surface 111 of the housing 1 and the second stress surface 3111 of the lead screw 31, under the action of the elastic restoring force of the elastic member 71, the lead screw 31 maintains a state of applying an axial force to the force transmission structure 4, thereby effectively avoiding the phenomenon that the distribution positions of the force transmission structure 4 and the ball screw mechanism 3 along the axial direction of the lead screw 31 are not fixed in the non-braking state.

[0068] When the braking device is in the braking state, during the rotation of the output end 2 of the transmission mechanism around its own central axis, it drives the inner ring of the first bearing 72 to rotate relative to the outer ring of the first bearing 72, and the elastic member 71 does not rotate, thereby also effectively avoiding the phenomenon that the distribution positions of the force transmission structure 4 and the ball screw mechanism 3 along the axial direction of the lead screw 31 are not fixed due to mutual wear in the prior art.

[0069] Preferably, as Figure 4 shown, the output end 2 of the transmission mechanism is fixedly connected to the axial end of the lead screw 31. It can also effectively reduce the axial span of the braking device along the lead screw 31, thereby further reducing the volume of the braking device.

[0070] It can be understood that, as Figures 2 - 4 shown, the central axis of the output end 2 of the transmission mechanism, the central axis of the lead screw 31 and the central axis of the first bearing 72 are all collinear. The central axis of the output end 2 of the transmission mechanism is collinear with the rotation center line of the output end 2 of the transmission mechanism. The central axis of the lead screw 31 is collinear with the rotation center line of the lead screw 31.

[0071] Preferably, as Figures 2 - 4 and Figure 6As shown, the elastic member 71 is a conical spring, and the large end of the conical spring is farther from the first bearing 72 than the small end of the conical spring. This enables an effective axial force along the lead screw 31 to be applied to the limiting structure, and also avoids interfering with the operation of the first bearing 72. Secondly, the force can be evenly applied to the limiting structure circumferentially along the limiting structure, resulting in good force stability of the limiting structure.

[0072] As an alternative solution, the elastic member 71 can also be set as a cylindrical spring. Further, it is preferably a corrugated spring.

[0073] Preferably, the first bearing 72 is a cylindrical roller bearing.

[0074] Among them, as Figure 3 and Figure 7 shown, the limiting structure and / or the limiting portion 11 are also provided with a first protective boss 21, and the first protective boss 21 is located on the outer periphery of the elastic member 71. The first protective boss 21 is used to axially abut against the limiting structure and / or the limiting portion 11 along the lead screw 31.

[0075] Specifically, when the limiting structure is provided with the first protective boss 21, the first protective boss 21 can axially abut against the limiting portion 11 along the lead screw 31. When the limiting portion 11 is provided with the first protective boss 21, the first protective boss 21 can axially abut against the limiting structure along the lead screw 31. When both the limiting structure and the limiting portion 11 are provided with the first protective boss 21, the first protective boss 21 on the limiting structure can axially abut against the limiting portion 11 along the lead screw 31, and the first protective boss 21 on the limiting portion 11 can axially abut against the limiting structure along the lead screw 31.

[0076] Specifically, if the limiting structure is the output end 2 of the transmission mechanism, the first protective boss 21 is provided on the output end 2 of the transmission mechanism. If the limiting structure is the lead screw 31, the first protective boss 21 is provided on the lead screw 31.

[0077] In this embodiment, as Figure 3 and Figure 7 shown, taking the example that the output end 2 of the transmission mechanism is provided with the first protective boss 21. When the braking device is in the braking state, the piston structure 5 approaches the friction plate structure 6 and clamps the brake disc through the friction plate structure 6. Under the action of the clamping force, the clamping force has a tendency to drive the housing 1 to move along the lead screw 31 in the direction of the friction plate structure 6. By providing the first protective boss 21, if the housing 1 is driven to move along the lead screw 31 in the direction of the friction plate structure 6, the first protective boss 21 can abut against the end face of the limiting portion 11 close to the first protective boss 21, so as to avoid excessive force on the elastic member 71, thereby effectively improving the service life of the elastic member 71.

[0078] Preferably, as Figure 7As shown, the number of the first protective bosses 21 is multiple, and the multiple first protective bosses 21 are distributed at intervals along the circumferential direction of the limiting structure.

[0079] Further preferably, the multiple first protective bosses 21 are all located on the outer periphery of the elastic member 71 and are all in contact with the outer periphery of the elastic member 71. It can be understood that the inner diameter of the ring formed by the multiple first protective bosses 21 is substantially the same as the outer diameter of the elastic member 71. Thereby, the dislocation of the elastic member 71 can be effectively avoided, and the working performance of the elastic member 71 is further improved. Secondly, it can also effectively ensure that the central axes of the output end 2 of the transmission mechanism, the lead screw 31 and the first bearing 72 are collinear, thereby further improving the working performance of the braking device.

[0080] It can be understood that the central axis of the elastic member 71 is also collinear with the central axis of the output end 2 of the transmission mechanism.

[0081] Preferably, as Figure 2 and Figure 3 shown, the housing 1 is further provided with a sliding cavity 12, and the depth direction of the sliding cavity 12 is parallel to the axial direction of the lead screw 31. The nut 32 is slidably arranged in the sliding cavity 12 and can extend or retract into the sliding cavity 12 along the axial direction of the lead screw 31. By limiting the nut 32 to only extend or retract into the sliding cavity 12 along the axial direction of the lead screw 31 through the sliding cavity 12, it can be further ensured that the central axes of the output end 2 of the transmission mechanism, the lead screw 31 and the first bearing 72 are collinear, thereby being able to further improve the working performance of the braking device.

[0082] Among them, as Figure 2 、 Figure 3 and Figure 5 shown, the lead screw 31 is axially recessed with a receiving space 311, and the bottom surface of the receiving space 311 is the second stress surface 3111. At least part of the force transmission structure 4 is received in the receiving space 311. With such a setting, the axial length of the lead screw 31 can be further reduced, thereby being able to further reduce the span of the braking device along the axial direction of the lead screw 31. Secondly, the receiving space 311 is equivalent to a weight reduction space, and the weight of the braking device can be further reduced.

[0083] Preferably, as Figure 2 、 Figure 3 and Figure 5 shown, one end surface of the force transmission assembly close to the second stress surface 3111 is a spherical end surface, and the second stress surface 3111 is also a spherical end surface, and the two spherical end surfaces are in surface contact. With such a setting, when the direction of the reaction force transmitted by the friction plate structure 6 to the piston structure 5 is not parallel to the axial direction of the lead screw 31, the two spherical end surfaces can also ensure that the reaction force can be effectively transmitted to the force transmission structure 4, thereby further improving the working stability of the braking device.

[0084] Specifically, the force transmission structure 4 includes a first force transmission gasket 44, a second bearing 43, and a second force transmission gasket 42 sleeved on the lead screw 31 along the axial direction. The first force transmission gasket 44 abuts against the second force receiving surface 3111 along the axial direction, and the second force transmission gasket 42 abuts against the first force receiving surface 111 along the axial direction.

[0085] As an alternative solution, the force transmission structure 4 includes a first force transmission gasket 44, a second bearing 43, a second force transmission gasket 42, and a force sensor 41 sleeved on the lead screw 31 along the axial direction. The first force transmission gasket 44 abuts against the second force receiving surface 3111 along the axial direction, and the force sensor 41 abuts against the first force receiving surface 111 along the axial direction.

[0086] Preferably, in this embodiment, as Figure 2 , Figure 3 and Figure 5 shown, the first force transmission gasket 44, the second bearing 43, and the second force transmission gasket 42 are all accommodated in the accommodation space 311, and a part of the force sensor 41 extends out of the accommodation space 311 to abut against the first force receiving surface 111. Thereby, the axial length of the lead screw 31 can be further reduced, the span of the braking device along the axial direction of the lead screw 31 can be further reduced, and the weight of the braking device can be reduced. In particular, when the direction of the reaction force transmitted by the friction plate structure 6 to the piston structure 5 is not parallel to the axial direction of the lead screw 31, the two spherical end faces can also ensure that the reaction force is effectively transmitted to the force sensor 41, thereby effectively improving the monitoring accuracy of the force sensor 41 and further improving the working performance of the braking device.

[0087] Specifically, in this embodiment, the second bearing 43 is a needle bearing. The needle bearing has good load-bearing capacity and anti-rotational inertia under high-speed operation, and can ensure the reliability of force transmission.

[0088] Optionally, the number of the first force transmission gaskets 44 is multiple, and the multiple first force transmission gaskets 44 are sequentially distributed along the axial direction of the lead screw 31. And / or, the number of the second force transmission gaskets 42 is multiple, and the multiple first force transmission gaskets 44 are sequentially distributed along the axial direction of the lead screw 31. By increasing or decreasing the number of the first force transmission gaskets 44 and / or the number of the second force transmission gaskets 42, the two ends of the force transmission structure 4 can be quickly and efficiently adjusted to abut against the first force receiving surface 111 and the second force receiving surface 3111 respectively along the axial direction of the lead screw 31. In this embodiment, it is exemplary to set that both the first force transmission gasket 44 and the second force transmission gasket 42 are one.

[0089] Among them, as Figure 2 and Figure 3 shown, the piston structure 5 includes a piston cover 51 and a force application disk 52. The nut 32 is connected to the piston cover 51, the force application disk 52 is movably connected to the piston cover 51, and the force application disk 52 can contact or separate from the friction plate structure 6.

[0090] By setting the force - applying disc 52 to be movably connected to the piston cover 51, the force - applying disc 52 can move relative to the piston cover 51. Thus, even when the direction of the reaction force transmitted by the friction plate structure 6 to the force - applying disc 52 is not parallel to the axial direction of the lead screw 31, the contact surface of the force - applying disc 52 can effectively and completely contact the friction plate structure 6, ensuring that the force - applying area is always maximized. Also, the force - applying disc 52 can effectively transmit the reaction force applied by the friction plate structure 6 to the force - transmitting structure 4. Thereby, it can further improve the monitoring accuracy of the force sensor 41 and further enhance the braking performance of the braking device.

[0091] In this embodiment, preferably, the way that the force - applying disc 52 is movably connected to the piston cover 51 is by ball - hinge connection. This enables the force - applying disc 52 to rotate relative to the piston cover 51. Thus, even when the direction of the reaction force transmitted by the friction plate structure 6 to the force - applying disc 52 is not parallel to the axial direction of the lead screw 31, the contact surface of the force - applying disc 52 can effectively and completely contact the friction plate structure 6, ensuring that the force - applying area is always maximized. Also, the force - applying disc 52 can effectively transmit the reaction force applied by the friction plate structure 6 to the force - transmitting structure 4.

[0092] Preferably, as Figure 3 shown, a concave cavity 521 is recessed on the end face of the force - applying disc 52 close to the friction plate structure 6. With this setting, it can further make the contact surface of the force - applying disc 52 effectively and completely contact the friction plate structure 6 and enable the force - applying disc 52 to quickly separate from the friction plate structure 6.

[0093] Further preferably, the number of the force - applying discs 52 is multiple, and the multiple force - applying discs 52 are spaced apart and distributed on the piston cover 51. Thereby, it can further enhance the braking performance of the braking device.

[0094] Optionally, as Figure 2 、 Figure 3 and Figure 5 shown, a weight - reducing cavity 312 is recessed on the end face of the lead screw 31 close to the piston structure 5. It can further reduce the weight of the braking device.

[0095] Preferably, the end face of the lead screw 31 close to the piston structure 5 is in clearance fit with the piston structure 5. As an alternative, as Figure 3 and Figure 5 shown, a second protective boss 313 is provided on the end face of the lead screw 31 close to the piston structure 5 and / or on the end face of the piston cover 51 close to the lead screw 31. With this setting, it can avoid the phenomenon that the lead screw 31 is adsorbed to the piston cover 51 under the action of the weight - reducing cavity 312. Thereby, it can further improve the working performance of the braking device.

[0096] It can be understood that when a second protective boss 313 is provided on the end face of the lead screw 31 close to the piston structure 5, the second protective boss 313 is an annular boss wound around the outer periphery of the weight reduction cavity 312.

[0097] Further preferably, as Figure 3 and Figure 5 shown, when a second protective boss 313 is provided on the end face of the piston cover 51 close to the lead screw 31, the number of the second protective bosses 313 is multiple, and the multiple second protective bosses 313 are circumferentially spaced apart from each other on the outer periphery of the weight reduction cavity 312.

[0098] Specifically, as Figure 2 and Figure 3 shown, a dust cover 8 is further connected to the connection portion between the nut 32 and the piston cover 51, and the outer ring of the dust cover 8 is connected to the housing 1. Such a setting is adopted to prevent debris and the like from entering the sliding cavity 12 and / or the ball screw mechanism 3 and / or the transmission mechanism. Thereby, the working performance and service life of the braking device can be further improved.

[0099] Among them, as Figure 2 shown, the friction plate structure 6 includes an inner friction plate structure 61 and an outer friction plate structure 62. Along the axial direction of the lead screw 31, the inner friction plate structure 61 is closer to the piston structure 5 than the outer friction plate structure 62. The force application disc 52 can be in contact with or separated from the inner friction plate structure 61.

[0100] Specifically, as Figure 1 and Figure 2 shown, the inner friction plate structure 61 is connected to the bracket 9 through a first elastic structure, and the outer friction plate structure 62 is connected to the housing 1 through a second elastic structure. Among them, the specific structures of the inner friction plate structure 61, the outer friction plate structure 62, the first elastic structure and the second elastic structure all belong to the prior art and will not be elaborated herein.

[0101] Among them, the specific structure of the transmission connection between the lead screw 31 and the nut 32 in the ball screw mechanism 3 belongs to the prior art and will not be elaborated herein.

[0102] The present invention further provides a vehicle, including the above-mentioned braking device. By adopting the above-mentioned braking device, the braking performance of the vehicle can be effectively improved.

[0103] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present utility model. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A braking device, comprising a housing (1), a transmission mechanism, a ball screw mechanism (3), a force transmission structure (4), a piston structure (5) and a friction plate structure (6). The ball screw mechanism (3) includes a matching lead screw (31) and a nut (32). The output end (2) of the transmission mechanism is fixedly connected to the lead screw (31) and can drive the lead screw (31) to rotate around its own central axis. The nut (32) is also fixedly connected to the piston structure (5). The nut (32) can drive the piston structure (5) to approach or move away from the friction plate structure (6) along the axial direction of the lead screw (31). The force transmission structure (4) is sleeved on the lead screw (31). It is characterized in that, The braking device further includes an elastic adjustment structure (7); The elastic adjustment structure (7) is disposed between the limiting structure and the limiting portion (11) of the housing (1); along the axial direction of the lead screw (31), the elastic restoring force of the elastic adjustment structure (7) can drive the limiting structure to move away from the friction plate structure (6) along the axial direction of the lead screw (31), and both ends of the force transmission structure (4) can respectively abut against the first force receiving surface (111) of the limiting portion (11) and the second force receiving surface (3111) of the lead screw (31); the limiting structure is the output end (2) of the transmission mechanism or the lead screw (31); At least the portion of the elastic adjustment structure (7) in contact with the limiting structure can rotate synchronously with the limiting structure.

2. The braking device according to claim 1, wherein The elastic adjustment structure (7) includes an elastic member (71) and a first bearing (72), the outer ring of the first bearing (72) is fixedly disposed on the limiting portion (11), and the inner ring of the first bearing (72) is in clearance fit with the limiting structure; Along the axial direction of the lead screw (31), one end of the elastic member (71) is elastically abutted or fixedly connected to the inner ring of the first bearing (72), and the other end is elastically abutted or fixedly connected to the limiting structure.

3. The braking device according to claim 2, wherein, The end surface of the limiting portion (11) away from the first force receiving surface (111) along the axial direction of the lead screw (31) is recessed with an installation groove, at least a part of the first bearing (72) is located in the installation groove, and the outer ring of the first bearing (72) is fixedly connected to the inner peripheral wall of the installation groove.

4. The braking device according to claim 2, characterized in that, The output end (2) of the transmission mechanism partially passes through the first bearing (72) along the axial direction of the lead screw (31).

5. The braking device according to claim 1, characterized in that The elastic adjustment structure (7) includes an elastic member (71) and a first bearing (72), the inner ring of the first bearing (72) is fixedly sleeved on the limiting structure, and the outer ring of the first bearing (72) is in clearance fit with the limiting portion (11); Along the axial direction of the lead screw (31), one end of the elastic member (71) is elastically abutted or fixedly connected to the outer ring of the first bearing (72), and the other end is elastically abutted or fixedly connected to the limiting portion (11).

6. The braking device according to any one of claims 2-5, characterized in that, The elastic member (71) is a conical spring, and the large end of the conical spring is farther from the first bearing (72) than the small end of the conical spring.

7. The braking device according to any one of claims 2-5, characterized in that, The limiting structure and / or the limiting portion (11) is further provided with a first protection boss (21), the first protection boss (21) is located on the outer periphery of the elastic member (71); the first protection boss (21) is used for axially abutting against the limiting structure and / or the limiting portion (11) along the lead screw (31).

8. The braking device according to any one of claims 1-5, characterized in that, The lead screw (31) is axially recessed with a receiving space (311), the bottom surface of the receiving space (311) is the second force receiving surface (3111); at least a part of the force transmission structure (4) is received in the receiving space (311).

9. The braking device according to claim 8, characterized in that, One end surface of the force transmission structure (4) close to the second force receiving surface (3111) is a spherical end surface, and the second force receiving surface (3111) is also a spherical end surface, and the two spherical end surfaces are in surface contact.

10. The braking device according to claim 8, characterized in that, The force transmission structure (4) includes a first force transmission gasket (44), a second bearing (43), and a second force transmission gasket (42) that are sleeved on the lead screw (31) in the axial direction. The first force transmission gasket (44) axially abuts against the second force receiving surface (3111), and the second force transmission gasket (42) axially abuts against the first force receiving surface (111).

11. The braking device according to claim 8, characterized in that, The force transmission structure (4) includes a first force transmission gasket (44), a second bearing (43), a second force transmission gasket (42), and a force sensor (41) that are sleeved on the lead screw (31) in the axial direction. The first force transmission gasket (44) axially abuts against the second force receiving surface (3111), and the force sensor (41) axially abuts against the first force receiving surface (111).

12. The braking device according to any one of claims 1-5, characterized in that, The piston structure (5) includes a piston cover (51) and a force application disc (52). The nut (32) is connected to the piston cover (51), the force application disc (52) is movably connected to the piston cover (51), and the force application disc (52) can contact or separate from the friction plate structure (6).

13. The braking device according to claim 12, characterized in that, A concave cavity (521) is recessed in the end face of the force application disc (52) close to the friction plate structure (6).

14. A vehicle, characterized in that, It includes the braking device according to any one of claims 1-13.

Images