Electrically-controlled brake voltage buildup module

Abstract

The invention discloses an electric control brake pressure buildup module in the technical field of brake systems. The electric control brake pressure buildup module comprises a pressure cylinder, a stress bearing, a motor assembly, a transmission assembly and a rotation stopping assembly. A hydraulic cavity is formed in the pressure cylinder; the motor assembly is arranged at the rear end of the pressure cylinder and comprises a motor shell and a hollow rotor shaft. The transmission assembly comprises a lead screw shaft and a lead screw nut, the lead screw shaft is arranged in an inner cavity of the hollow rotor shaft, the rear end of the lead screw shaft is in axial sliding connection with the motor shell through the rotation stopping assembly, the front end of the lead screw shaft is connected with the plunger installed in the hydraulic cavity, and the lead screw nut is installed at the front end of the lead screw shaft. The rear end of the lead screw nut is fixedly connected with the front end of the hollow rotor shaft, and the front end of the lead screw nut is rotationally connected with the pressure cylinder through a stress bearing. According to the invention, the design requirements on the strength and rigidity of the motor shell are reduced, and the deformation of the motor shell can be effectively prevented, so that the NVH performance of a system is improved, the system structure is simplified, the cost is reduced, the efficiency is increased, and the reliability of the system is improved.

Description

Technical Field

[0001] This invention relates to the field of braking system technology, and more specifically to an electronically controlled braking pressure build-up module. Background Technology

[0002] With the development of electrification and intelligence in the automotive field, brake-by-wire systems are being used more and more. The current mainstream solution is a combination of a hollow shaft motor and a ball screw, and the two are decoupled. The ball screw and the motor are connected by splines or by pressing directly into the inner hole of the bearing housing. For example, patent document CN114802150B discloses an electric brake pressure build-up module, and patent document CN116266726A discloses an electric brake pressure build-up module.

[0003] In both of the above connection methods, the load-bearing bearing is installed at the tail end of the motor. The axial force is transmitted to the motor housing through the load-bearing bearing line, and then to the valve body (booster cylinder) through the motor housing. Thus, the motor housing not only needs to bear the radial support function of the load-bearing bearing, but also the axial load-bearing function. This places special requirements on the design and load-bearing capacity of the motor housing, resulting in the following shortcomings of the existing electrically controlled brake pressure-building modules:

[0004] (1) The concentricity of the load bearing and the booster cylinder is a cumulative tolerance, which leads to poor assembly concentricity of the system.

[0005] (2) Special requirements were put forward for the strength, rigidity and position of the motor housing and the fixing screws, which resulted in limited design of the motor housing and increased wall thickness, which in turn made the entire module occupy a large space and heavy weight, which was not conducive to lightweighting and flexible layout.

[0006] (3) The motor housing is prone to deformation when subjected to large axial force, which in turn affects the NVH performance of the motor.

[0007] (4) The entire pressure building module has many parts and a complex structure, which is not conducive to cost control.

[0008] (5) Deformation of the motor housing may generate overturning force, which may cause abnormal wear of the deep groove ball bearing shoulder at the front end of the motor.

[0009] Therefore, how to reduce the axial force on the motor housing and lower the design requirements of the motor housing has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0010] In view of this, the purpose of the present invention is to provide an electrically controlled braking pressure build-up module to address the above-mentioned technical problems, thereby reducing the axial force borne by the motor housing, thereby reducing the design requirements of the motor housing and preventing deformation of the motor housing.

[0011] The technical solution adopted in this invention is: an electrically controlled brake pressure building module, comprising: a booster cylinder, a force-bearing bearing, a motor assembly, a transmission assembly, and an anti-rotation assembly;

[0012] The booster cylinder is provided with a hydraulic chamber;

[0013] The motor assembly is located at the rear end of the booster cylinder, and the motor assembly includes a motor housing and a hollow rotor shaft;

[0014] The transmission assembly includes a lead screw shaft and a lead screw nut. The lead screw shaft is disposed in the inner cavity of the hollow rotor shaft. The rear end of the lead screw shaft is axially slidably connected to the motor housing through an anti-rotation component. The front end of the lead screw shaft is connected to a plunger installed in the hydraulic chamber. The lead screw nut is installed at the front end of the lead screw shaft. The rear end of the lead screw nut is fixedly connected to the front end of the hollow rotor shaft. The front end of the lead screw nut is rotatably connected to the booster cylinder through a force-bearing bearing.

[0015] Preferably, the rear end face of the booster cylinder has a bearing chamber communicating with the hydraulic chamber, the force bearing is installed in the bearing chamber, and the outer ring of the force bearing is fixedly connected to the booster cylinder, and the inner ring of the force bearing is fixedly connected to the front end of the lead screw nut.

[0016] Preferably, a bearing pressure plate is fixedly connected to the rear end face of the booster cylinder, and the inner end of the bearing pressure plate is pressurized on the bearing.

[0017] Preferably, a position sensing component is installed between the booster cylinder and the motor assembly.

[0018] Preferably, the position sensing component includes an RPS trigger disk and an RPS PCBA, wherein the RPS trigger disk is connected to a lead screw nut, and the RPS PCBA is mounted on a plastic body on a bearing pressure plate and faces the RPS trigger disk.

[0019] Preferably, the bearing plate is provided with an electrical socket that is electrically connected to the RPS PCBA.

[0020] Preferably, a support bearing is provided between the rear end of the hollow rotor shaft and the motor housing.

[0021] Preferably, the lead screw nut and the hollow rotor shaft are integrally formed.

[0022] Preferably, the anti-rotation assembly includes an anti-rotation sleeve and an anti-rotation body. The anti-rotation body is sleeved on the rear end of the lead screw shaft and is fixedly connected to the lead screw shaft in the circumferential direction. An axial slider is formed on the anti-rotation body. The anti-rotation sleeve includes an outer cylinder and an inner cylinder that are fixedly connected. The outer cylinder is fixedly connected to the motor housing. An axial guide groove is formed on the inner cylinder, and the axial slider is slidably connected in the axial guide groove.

[0023] Preferably, the plunger is threaded or interference-fitted to the lead screw shaft.

[0024] The beneficial effects of this invention are:

[0025] This invention places the load-bearing bearing in the foreground between the booster cylinder and the lead screw nut of the transmission assembly, and fixes the lead screw nut to the hollow rotor shaft. This decouples the load-bearing bearing from the motor housing and couples the transmission assembly with the motor assembly. This shortens the axial force transmission path, so the motor housing does not bear axial force, reducing the strength and rigidity design requirements of the motor housing. It can effectively prevent the motor housing from deforming, thereby improving the NVH performance of the system, simplifying the system structure, reducing costs and increasing efficiency, and improving the reliability of the system. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the electrically controlled brake voltage-building module of the present invention;

[0027] Figure 2 This is a front view of the rotor assembly;

[0028] Figure 3 This is a schematic diagram of the rotor assembly.

[0029] Figure 4 A first-view perspective three-dimensional schematic diagram of the rotor assembly;

[0030] Figure 5 This is a second-view perspective three-dimensional schematic diagram of the rotor assembly;

[0031] Figure 6 for Figure 1 AA section diagram;

[0032] Figure 7 A schematic diagram of the structure of the sleeve;

[0033] Figure 8 A schematic diagram of the structure for rotation.

[0034] Explanation of the reference numerals in the figure:

[0035] 10. Booster cylinder; 11. Hydraulic chamber; 12. Bearing chamber;

[0036] 20. Load-bearing bearings;

[0037] 30. Motor assembly; 31. Motor housing; 32. Hollow rotor shaft; 33. Motor stator; 34. Motor rotor;

[0038] 40. Transmission assembly; 41. Lead screw shaft; 42. Lead screw nut;

[0039] 50. Anti-rotation assembly; 51. Anti-rotation sleeve; 52. Anti-rotation body; 53. Axial slider; 54. Outer cylinder; 55. Inner cylinder; 56. Axial guide groove;

[0040] 60. Plunger;

[0041] 70. Bearing pressure plate; 71. Electrical socket;

[0042] 80. Position sensing component; 81. RPS trigger disk; 82. RPS PCBA;

[0043] 90. Support bearing. Detailed Implementation

[0044] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. These embodiments are for illustrative purposes only and are not intended to limit the scope of the invention.

[0045] In the description of this invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0047] Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0048] Examples, such as Figures 1-8As shown, an electrically controlled brake pressure build-up module includes: a booster cylinder 10, a force-bearing bearing 20, a motor assembly 30, a transmission assembly 40, and an anti-rotation assembly 50.

[0049] A hydraulic chamber 11 is provided on the booster cylinder 10, and a plunger 60 is installed in the hydraulic chamber 11.

[0050] The motor assembly 30 is installed at the rear end of the booster cylinder 10. The motor assembly 30 includes a motor housing 31 and a hollow rotor shaft 32. The front end of the motor housing 31 is fixedly connected to the booster cylinder 10, and the hollow rotor shaft 32 is installed in the inner cavity of the motor housing 31.

[0051] The transmission assembly 40 includes a lead screw shaft 41 and a lead screw nut 42. The lead screw shaft 41 is installed in the inner cavity of the hollow rotor shaft 32, and the rear end of the lead screw shaft 41 is axially slidably connected to the motor housing 31 through an anti-rotation assembly 50. The front end of the lead screw shaft 41 is connected to the plunger 60. The lead screw nut 42 is installed at the front end of the lead screw shaft 41, and the rear end of the lead screw nut 42 is fixedly connected to the front end of the hollow rotor shaft 32. The front end of the lead screw nut 42 is rotatably connected to the booster cylinder 10 through a force bearing 20.

[0052] This invention positions the load-bearing bearing 20 between the booster cylinder 10 and the lead screw nut 42 of the transmission assembly 40, and fixes the lead screw nut 42 to the hollow rotor shaft 32. This decouples the load-bearing bearing 20 from the motor housing 31 and couples the transmission assembly 40 with the motor assembly 30. This shortens the axial force transmission path, preventing the motor housing 31 from bearing axial force. This reduces the strength and rigidity design requirements for the motor housing 31, effectively preventing deformation of the motor housing 31. Consequently, it improves the NVH performance of the system, simplifies the system structure, reduces costs and increases efficiency, and enhances the reliability of the system.

[0053] It should be noted that, in this invention, the front-back direction refers to... Figure 1 The direction of the double arrow in the image.

[0054] Specific embodiment 1, such as Figures 1-8 As shown, an electrically controlled brake pressure build-up module includes: a booster cylinder 10, a force-bearing bearing 20, a motor assembly 30, a transmission assembly 40, an anti-rotation assembly 50, and a plunger 60.

[0055] A hydraulic chamber 11 and a bearing chamber 12 are provided on the booster cylinder 10. The bearing chamber 12 is located on the rear end face of the booster cylinder 10, that is, the bearing chamber 12 is located at the end of the booster cylinder 10 near the motor assembly 30. The radial dimension of the bearing chamber 12 is larger than the radial dimension of the hydraulic chamber 11, and the bearing chamber 12 and the hydraulic chamber 11 are coaxially arranged and connected.

[0056] The plunger 60 is installed in the hydraulic chamber 11.

[0057] The motor assembly 30 is installed at the rear end of the booster cylinder 10. The motor assembly 30 includes a motor housing 31, a hollow rotor shaft 32, a motor stator 33, and a motor rotor 34. The front end of the motor housing 31 is fixedly connected to the booster cylinder 10. The hollow rotor shaft 32, the motor stator 33, and the motor rotor 34 are all installed in the inner cavity of the motor housing 31. The motor stator 33 is fixedly connected to the motor housing 31, and the motor rotor 34 is fixedly installed on the hollow rotor shaft 32.

[0058] Preferred, such as Figure 1 As shown, a support bearing 90 is installed between the rear end of the hollow rotor shaft 32 and the motor housing 31. That is, a support bearing 90 is installed between the end of the hollow rotor shaft 32 away from the booster cylinder 10 and the motor housing 31. The support bearing 90 is installed between the rear end of the hollow rotor shaft 32 and the rear end of the motor housing 31, and the inner ring of the support bearing 90 is fixedly connected to the hollow rotor shaft 32, and the outer ring of the support bearing 90 is fixedly connected to the motor housing 31, so as to support the motor housing 31 in the radial direction.

[0059] The transmission assembly 40 includes a lead screw shaft 41 and a lead screw nut 42. The lead screw shaft 41 is coaxially installed in the inner cavity of the hollow rotor shaft 32, and the rear end of the lead screw shaft 41 is axially slidably connected to the motor housing 31 through an anti-rotation assembly 50. That is, the end of the lead screw shaft 41 away from the booster cylinder 10 is axially slidably connected to the motor housing 31 through the anti-rotation assembly 50, so that the lead screw shaft 41 is fixedly connected to the motor housing 31 in the circumferential direction, and in the axial direction, the lead screw shaft 41 can reciprocate relative to the motor housing 31.

[0060] The front end of the lead screw shaft 41 is connected to the plunger 60, for example, the rear end of the plunger 60 is threadedly connected to the front end of the lead screw shaft 41.

[0061] Preferred, such as Figure 6 , Figure 7 , Figure 5 As shown, the anti-rotation assembly 50 includes an anti-rotation sleeve 51 and an anti-rotation body 52. ​​The anti-rotation body 52 is sleeved on the rear end of the lead screw shaft 41. The anti-rotation body 52 is fixedly connected to the lead screw shaft 41 in the circumferential direction. For example, a connecting section is integrally formed at the tail end of the lead screw shaft 41. The side of the connecting section includes an arc section and a straight section. The connecting section is axially inserted into the connecting hole of the anti-rotation body 52, and the shape of the connecting hole is the same as the shape of the straight section.

[0062] An axial slider 53 is formed on the anti-rotation body 52. ​​The axial slider 53 extends along the axial direction of the anti-rotation body 52, and there are multiple axial sliders 53, which are evenly distributed on the outer circumferential surface of the anti-rotation body 52. ​​The anti-rotation sleeve 51 includes an outer cylinder 54 and an inner cylinder 55 that are fixedly connected. The outer cylinder 54 is fixedly connected to the motor housing 31. The inner cylinder 55 is coaxially disposed in the inner cavity of the outer cylinder 54 and is located on the periphery of the lead screw shaft 41. An axial guide groove 56 is formed on the inner cylinder 55. The axial guide groove 56 is arranged along the axial direction of the inner cylinder 55, and the number of axial guide grooves 56 is equal to the number of axial sliders 53. The multiple axial sliders 53 are slidably connected to the multiple axial guide grooves 56 in a one-to-one correspondence.

[0063] The lead screw nut 42 is installed at the front end of the lead screw shaft 41, and the rear end of the lead screw nut 42 is fixedly connected to the front end of the hollow rotor shaft 32. For example, the lead screw nut 42 and the hollow rotor shaft 32 are integrally formed, and the front end of the lead screw nut 42 is rotatably connected to the booster cylinder 10 through the force bearing 20. That is, the front end of the lead screw nut 42 is located in the bearing chamber 12. The force bearing 20 is installed in the bearing chamber 12, and the outer ring of the force bearing 20 is fixedly connected to the booster cylinder 10, while the inner ring of the force bearing 20 is fixedly connected to the lead screw nut 42.

[0064] Preferred, such as Figure 1 As shown, the load-bearing bearing 20 is placed inside the bearing chamber 12. A bearing pressure plate 70 is fixedly connected to the rear end face of the booster cylinder 10. The inner diameter of the bearing pressure plate 70 is smaller than the outer diameter of the load-bearing bearing 20, so that the inner end of the bearing pressure plate 70 presses against the rear end face of the outer ring of the load-bearing bearing 20, thereby axially fixing the outer ring of the load-bearing bearing 20 to the booster cylinder 10. The load-bearing bearing 20 is sleeved on the lead screw nut 42. An annular boss is formed at the front end of the lead screw nut 42. The annular boss presses against the front end face of the inner ring of the load-bearing bearing 20, thereby axially fixing the inner ring of the load-bearing bearing 20 to the lead screw nut 42.

[0065] In other preferred embodiments, such as Figures 1-5 As shown, a position sensing component 80 is installed between the booster cylinder 10 and the motor assembly 30.

[0066] The position sensing assembly 80 includes an RPS trigger disk 81 and an RPS PCBA 82. The RPS trigger disk 81 is connected to the lead screw nut 42, and the RPS PCBA 82 is mounted on a plastic body on the bearing pressure plate 70 and is directly opposite the RPS trigger disk 81.

[0067] A bracket and an electrical socket 71 are connected to the bearing pressure plate 70. The RPS trigger disk 81 is mounted on the bracket and is electrically connected to the electrical socket 71 for signal transmission.

[0068] It should be noted that RPS stands for Referenz punkt-system, and that RPS trigger disk 81 and RPS PCBA82 are existing technologies, which will not be elaborated on here.

[0069] The working principle of the electrically controlled brake voltage-building module of the present invention is as follows:

[0070] The electrically controlled braking pressure-building module of the present invention integrates the load-bearing bearing 20 in the front of the booster cylinder 10, thereby decoupling the transmission component 40 from the motor housing 31 and coupling the transmission component 40 with the hollow rotor shaft 32, shortening the axial force transmission path. The lead screw nut 42 is connected to the hollow rotor shaft 32 as one unit, which not only simplifies the structure of the pressure-building module, but also effectively reduces the span between the load-bearing support point and the plunger 60, which can effectively improve the NVH performance of the system, while simplifying the system structure, achieving cost reduction and efficiency improvement, and enhancing the reliability of the system.

[0071] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0072] This invention decouples the axial force from the motor housing, so the motor housing no longer bears the axial force. The bearing that bears the axial force is moved forward to the front end of the motor and integrated with the valve body. This optimizes the positioning between the lead screw shaft and the booster cylinder, improves the concentricity of the assembly, simplifies the mechanical structure of the pressure building module, and reduces the number of parts.

[0073] This invention decouples the axial force during pressure build-up from the motor housing and positions the load-bearing bearing between the transmission assembly and the booster cylinder. This allows the axial force to be directly transmitted to the booster cylinder, shortening the transmission path of the axial force and preventing it from being transmitted to the motor housing. This reduces the stress and deformation of the motor housing and related structures, fundamentally improving the NVH performance of the system and eliminating the risks of bearing climbing shoulders caused by housing deformation.

[0074] The motor housing in this invention does not bear axial force, which greatly reduces the strength and rigidity requirements of the motor housing, allowing it to be designed to be thinner and lighter, with less installation space required, which is beneficial for system layout.

[0075] This invention surrounds the motor housing with the transmission assembly, and the transmission assembly is decoupled from the motor housing. This allows the motor housing to not only fix the motor stator, but also serve as a shield, effectively isolating and absorbing internal mechanical noise and electromagnetic interference, thus improving NVH (noise, vibration, and harshness).

[0076] This invention integrates the lead screw nut and the hollow rotor shaft into one piece, reducing the number of parts, simplifying assembly, which is beneficial for cost reduction and efficiency improvement. It also reduces tolerance accumulation and helps improve concentricity and reliability.

[0077] This invention adopts a transmission form of screw nut rotation + screw shaft linear motion. The force bearing is close to the front plunger, and the distance between the support point and the plunger is small, which can effectively suppress the swing amplitude of the screw movement and improve NVH and pressure build-up control accuracy.

[0078] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. An electrically controlled brake voltage-building module, characterized in that, include: The booster cylinder (10), the load bearing (20), the motor assembly (30), the transmission assembly (40), and the anti-rotation assembly (50); The booster cylinder (10) is provided with a hydraulic chamber (11); The motor assembly (30) is located at the rear end of the booster cylinder (10), and the motor assembly (30) includes a motor housing (31) and a hollow rotor shaft (32). The transmission assembly (40) includes a lead screw shaft (41) and a lead screw nut (42). The lead screw shaft (41) is disposed in the inner cavity of the hollow rotor shaft (32). The rear end of the lead screw shaft (41) is axially slidably connected to the motor housing (31) through an anti-rotation assembly (50). The front end of the lead screw shaft (41) is connected to a plunger (60) installed in the hydraulic chamber (11). The lead screw nut (42) is installed at the front end of the lead screw shaft (41). The rear end of the lead screw nut (42) is fixedly connected to the front end of the hollow rotor shaft (32). The front end of the lead screw nut (42) is rotatably connected to the booster cylinder (10) through a force bearing (20).

2. The electrically controlled brake voltage-building module according to claim 1, characterized in that, The rear end face of the booster cylinder (10) is provided with a bearing chamber (12) that communicates with the hydraulic chamber (11). The load bearing (20) is installed in the bearing chamber (12), and the outer ring of the load bearing (20) is fixedly connected to the booster cylinder (10). The inner ring of the load bearing (20) is fixedly connected to the front end of the lead screw nut (42).

3. The electrically controlled brake voltage-building module according to claim 2, characterized in that, The rear end face of the booster cylinder (10) is fixedly connected to a bearing pressure plate (70), and the inner end of the bearing pressure plate (70) is pressurized on the bearing (20).

4. The electrically controlled brake voltage-building module according to claim 3, characterized in that, A position sensing component (80) is installed between the booster cylinder (10) and the motor assembly (30).

5. The electrically controlled brake voltage-building module according to claim 4, characterized in that, The position sensing component (80) includes an RPS trigger disk (81) and an RPS PCBA (82). The RPS trigger disk (81) is connected to a lead screw nut (42), and the RPS PCBA (82) is mounted on a plastic body on a bearing pressure plate (70) and is directly opposite the RPS trigger disk (81).

6. The electrically controlled brake voltage-building module according to claim 5, characterized in that, The bearing plate (70) is provided with an electrical socket (71) that is electrically connected to the RPS PCBA (82).

7. The electrically controlled brake voltage-building module according to claim 1, characterized in that, A support bearing (90) is provided between the rear end of the hollow rotor shaft (32) and the motor housing (31).

8. The electrically controlled brake voltage-building module according to claim 1, characterized in that, The lead screw nut (42) and the hollow rotor shaft (32) are integrally formed.

9. The electrically controlled brake voltage-building module according to claim 1, characterized in that, The anti-rotation assembly (50) includes an anti-rotation sleeve (51) and an anti-rotation body (52). The anti-rotation body (52) is sleeved on the rear end of the lead screw shaft (41) and is fixedly connected to the lead screw shaft (41) in the circumferential direction. An axial slider (53) is formed on the anti-rotation body (52). The anti-rotation sleeve (51) includes an outer cylinder (54) and an inner cylinder (55) that are fixedly connected. The outer cylinder (54) is fixedly connected to the motor housing (31). An axial guide groove (56) is formed on the inner cylinder (55). The axial slider (53) is slidably connected in the axial guide groove (56).

10. The electrically controlled brake voltage-building module according to claim 1, characterized in that, The plunger (60) is threaded or interference-fitted to the lead screw shaft (41).

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