Locking mechanism, parking brake locking device and vehicle

Abstract

The invention discloses a locking mechanism, a parking brake locking device and a vehicle, the locking mechanism comprises an electromagnet shell, a push rod shaft, a static iron core, a movable iron core and an electromagnet coil winding, the static iron core and the movable iron core are arranged in the electromagnet shell, the electromagnet coil winding is arranged around the iron cores, and the push rod shaft is of a telescopic integral rod shaft structure connected with the movable iron core; and a locking part which is matched with a locking groove in the transmission gear for locking and unlocking is formed at the end part of the transmission gear. The push rod shaft is of the integrated shaft structure integrated with the locking part, the risk of the connection strength of the locking part structure and the push rod is eliminated through the integrated structure, and the number of parts is reduced. And an anti-rotation structure is integrated with the push rod and the static iron core, so that the functions of parts are realized, an additional anti-rotation structure can be omitted, the product design is more compact, the assembly is simple and convenient, and the weight and the manufacturing cost are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of braking systems, and in particular to a locking mechanism, a parking brake locking device, and a vehicle. Background Art

[0002] With the electrification transformation of vehicles, the wire-controlled braking system has gradually become a major development trend in the automotive industry. As one of them, the electro-mechanical braking (EMB) system has also developed. In the existing technical solutions of the EMB brake caliper, the brake caliper structure all has a locking mechanism. Among them, there is a structure that uses an electromagnet as the locking power device. By the extension and retraction of the locking head of the electromagnet, the power transmission route is locked and unlocked, so as to realize the locking of the entire parking system. Among them, the extension and retraction of the locking head are pushed by an electromagnet push rod. When parking and locking, due to the existence of the parking clamping force, there is a reverse acting force on the transmission route to maintain, and this reverse acting force will act on the locking mechanism module through the locking head structure and the push rod all the time, which also raises certain strength requirements for the locking head structure and the push rod of the electromagnet.

[0003] As Figure 12 shown, in the prior art, in order to ensure the contact strength, the connection between the lock head and the lock groove adopts surface-to-surface contact or line-to-surface contact, so the locking head adopts a polygonal structure; the locking head structure 13 is installed at the end of the push rod 10 of the electromagnet body, and a fixed bracket 11 is set to prevent the locking head from rotating, and a buffer spring 12 is arranged in the fixed bracket to ensure stability. It has a large number of components and relatively high costs; in Chinese Patent CN218598679U, the locking head is quadrilateral, but an additional circular bracket with a square boss needs to be added to mate with the locking head to achieve anti-rotation, and at the same time, the locking head and the push rod are axially fixedly connected.

[0004] The locking mechanisms in the prior art have the following problems:

[0005] 1. Assembly strength: In the prior art, the locking head and the push rod are assembled separately. Since the components are all very small, assembly space is required and the assembly difficulty is high. Moreover, after the fixed connection, there is a risk of the connection strength between the locking head structure and the push rod; 2. Additional anti-rotation structure for assembly: In the prior art, an additional circular bracket with a square boss needs to be added to mate with the locking head to achieve anti-rotation, which results in an increase in the number of components to be assembled in the locking mechanism module, and both the weight and cost are relatively high. Summary of the Invention

[0006] Aiming at the deficiencies of the prior art, the present invention provides a locking mechanism, a parking brake locking device, and a vehicle. The locking push rod structure is integrally arranged, effectively improving the structural strength and being easy to assemble.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0008] A locking mechanism includes an electromagnet housing, a push rod shaft, a stationary iron core and a moving iron core arranged in the electromagnet housing, and an electromagnet coil winding arranged around the iron core. The push rod shaft is an integral rod shaft structure connected to the moving iron core and capable of telescoping, and a locking portion is formed at its end for cooperating with a locking groove on a transmission gear to perform locking and unlocking.

[0009] Furthermore:

[0010] An anti-rotation section and a matching section are also integrated on the push rod shaft, and the push rod shaft is fixedly connected to the moving iron core through the matching section.

[0011] The push rod shaft is an integrally formed one-piece shaft structure.

[0012] The locking portion of the push rod shaft includes a locking end face and a non-locking end face arranged oppositely. Both the locking end face and the non-locking end face are inclined planes, and the slope of the locking end face is smaller than that of the non-locking end face.

[0013] An anti-rotation hole for preventing the push rod shaft from rotating is provided on the stationary iron core, and the anti-rotation section cooperates with the anti-rotation hole.

[0014] The matching section of the push rod shaft and the moving iron core are fixedly and cooperatively connected through interference press-fitting or spline riveting.

[0015] The anti-rotation section on the push rod shaft is arranged near the locking portion.

[0016] The stationary iron core includes a pair of stationary iron cores arranged oppositely. One stationary iron core is arranged at the top of the electromagnet housing, and the other stationary iron core is arranged at the bottom of the electromagnet housing. An anti-rotation hole is provided on the stationary iron core at the top, and a round hole for movably cooperating with the lower part of the push rod shaft is provided on the stationary iron core at the bottom.

[0017] The anti-rotation hole is arranged along the central axis of the stationary iron core at the top.

[0018] A parking brake locking device includes an actuator housing, a double gear, and a locking motor. The locking motor is connected to the double gear, and a locking groove is provided on the double gear. The locking mechanism is also included, and the locking portion at the end of the push rod shaft is arranged corresponding to the locking groove.

[0019] A vehicle includes the parking brake locking device described above.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] The locking mechanism is a locking mechanism with an integrated push rod shaft electromagnet structure. The push rod shaft is an integral shaft structure integrated with a locking portion. The integral structure eliminates the risk of the connection strength between the locking head structure and the push rod, reducing the number of components. In addition, the anti-rotation structure is integrally designed with the push rod and the static iron core, eliminating the need for an additional anti-rotation structure while realizing the functions of the components, making the product design more compact, the assembly simpler, and reducing the weight and manufacturing cost. Description of the Drawings

[0022] The following briefly describes the content expressed in each drawing of this specification and the marks in the drawings:

[0023] Figure 1 It is a schematic diagram of the electromagnet push rod being pushed out according to the present invention.

[0024] Figure 2 It is a schematic diagram of the electromagnet push rod retracting according to the present invention.

[0025] Figure 3 It is a cross-sectional view of the electromagnet structure according to the present invention.

[0026] Figure 4 It is an overall view of the electromagnet push rod shaft according to the present invention Figure 1 .

[0027] Figure 5 It is Figure 4 An enlarged schematic diagram of the locking section in

[0028] Figure 6 It is a schematic diagram of the cooperation between the locking section and the locking groove according to the present invention.

[0029] Figure 7 It is an overall view of the electromagnet push rod shaft according to the present invention Figure 2 .

[0030] Figure 8 It is a schematic diagram of the upper static iron core according to the present invention.

[0031] Figure 9 It is a schematic diagram of the lower static iron core according to the present invention.

[0032] Figure 10 It is a schematic diagram of the assembly of the electromagnet structure according to the present invention.

[0033] Figure 11 It is a schematic diagram of the section of the locking device according to the present invention.

[0034] Figure 12 It is an exploded schematic diagram of the existing locking mechanism.

[0035] In the figure:

[0036] 1. Electromagnet assembly; 1a. Push rod shaft; 1a1. Locking section; 1a1-1. Locking end face; 1a1-2. Non-locking end face; 1a2. Anti-rotation section; 1a3. Assembly section; 1b. Electromagnet housing; 1c. Electromagnet end cover; 1d. Integrally injection-molded structure of electromagnet busbar and coil winding support; 1e / 1i. Static iron core; 1f. Moving iron core; 1h / 1g. Electromagnet coil winding; 1j / 1k. Permanent magnet; 2. Brushless motor; 3. Actuator housing; 3a. Electromagnet cavity; 4. Double gear; 5. Axle pin; 6. Circuit board; 7. ECU housing; 8. ECU housing cover. Detailed implementation manners

[0037] The following further elaborates in detail on the specific implementation manners of the present invention by describing the embodiments with reference to the accompanying drawings.

[0038] As Figures 1 to 9 shown, the locking mechanism with an integrated push rod shaft electromagnet structure adopts an integrated push rod shaft, integrates the locking head structure with the push rod, and at the same time integrates the anti-rotation structure with the push rod and the static iron core. While realizing the functions of the components, it not only reduces the component assembly process, but also increases the strength of the push rod shaft, optimizes the component design, and reduces the manufacturing cost.

[0039] The locking mechanism is an electromagnet assembly 1 for parking a lockable transmission gear. The electromagnet assembly includes an electromagnet housing 1b, a push rod shaft 1a, a static iron core 1e / 1i and a moving iron core 1f arranged in the electromagnet housing. An electromagnet coil winding 1h / 1g and a permanent magnet 1j / 1k are arranged around the static iron core and the moving iron core in the electromagnet housing; and an integrally injection-molded structure 1d of an electromagnet busbar and a coil winding support is integrally arranged on the housing; the push rod shaft is connected to the moving iron core to form a telescopic rod shaft structure. The push rod shaft is an integral rod shaft structure, and its end forms a locking portion for cooperating with the transmission gear for locking and unlocking.

[0040] That is, the push rod shaft structure integrates a locking section 1a1, an anti-rotation section 1a2, and an assembly section 1a3. The integral structure realizes the functions of the overall components, optimizes the component design, and reduces the manufacturing cost; it is assembled with the moving iron core through a mating section; preferably, the mating section of the push rod shaft and the moving iron core are fixedly fitted by interference press fitting or spline riveting.

[0041] The material of the integrated push rod shaft is a non-magnetic or slightly magnetic metal material, meeting the use strength; the push rod shaft is an integrally formed one-piece shaft structure; preferably a cold-pressed forging integral structure or a machined integral structure, which is integrally processed and manufactured, has a relatively low cost, and simplifies the number of components and is easy to assemble.

[0042] The locking part of the push rod shaft 1a includes a locking end face 1a1-1 and a non-locking end face 1a1-2. The locking end face and the non-locking end face are arranged opposite to each other. The inclination of the locking end face 1a1-1 is smaller than that of the non-locking end face 1a1-1, that is, a locking surface with a small inclination and a non-locking surface with a large inclination are formed, which can improve the locking stability; the head shape of the locking part can be circular, square or fan-shaped, which matches the shape of the locking groove of the double gear 4.

[0043] When locking, the locking push rod pushes the locking head out, and then the locking end face of the locking groove contacts the locking end face of the locking push rod head. Here, the locking end face is set as a small inclined surface structure because the locking push rod will be slightly tilted when the force is applied to the locking push rod. The small inclined surface structure is to better fit the locking end face of the locking push rod head with the locking end face of the locking groove when locking, so as to ensure the reliability of effective locking; similarly, the non-locking surface of the locking head and the locking groove is set in the shape of a matching large inclined surface, so that the locking head of the electromagnet can be pushed out by the rotation of the gear; there are two purposes for such setting, one is the re-clamping function, that is, after the vehicle completes parking, it is found that the parking force is insufficient, the gear can be directly rotated, and the axial thrust can be generated by the contact of the non-locking surface to push the locking push rod out, release the parking state, and re-clamp in time to achieve the required parking force: the other is that in the parking lock state, the electromagnet fails and cannot act, at this time, the locking gear can be driven by the motor to rotate to push the locking push rod out, and the parking lock state can be released.

[0044] The anti-rotation section on the push rod shaft is arranged close to the locking part; the static iron core is provided with an anti-rotation hole for preventing the push rod shaft from rotating, the anti-rotation hole is a square hole, the anti-rotation section cooperates with the anti-rotation hole, and the anti-rotation hole is arranged along the central axis of the static iron core at the top; the anti-rotation structure is integrated with the push rod and the static iron core, and the additional anti-rotation structure can be eliminated while realizing the function of the components, thereby optimizing the component design and reducing the cost.

[0045] The static iron core includes a pair of static iron cores arranged opposite to each other, an electromagnet end cover 1c is provided on the top of the electromagnet shell, one static iron core is arranged on the electromagnet end cover, and the other static iron core is arranged at the bottom of the electromagnet shell, an anti-rotation hole is provided on the top static iron core, and a circular hole that is movably matched with the lower part of the push rod shaft is provided on the bottom static iron core; the moving iron core is arranged between the pair of static iron cores and fixedly connected with the matching section of the push rod shaft.

[0046] The electromagnet push rod is made into a locking section, an anti-rotation section and an assembly section which are integrated into one; the top locking section and the upper anti-rotation section of the electromagnet push rod are arranged adjacent to each other, and the push rod shaft assembly section of the electromagnet push rod is arranged at the lower part, which is a cylindrical structure, so that it is easy to process and manufacture.

[0047] like Figure 10 and Figure 11As shown in the figure, the parking brake locking device includes an actuator housing 3, a double gear 4, and a locking motor. The locking motor is a brushless motor 2. The double gear is installed through a pin 5. The locking motor is connected to the double gear. The double gear is provided with a locking groove. The locking mechanism is further included. The locking portion at the end of the push rod shaft is arranged corresponding to the locking groove.

[0048] This patent proposes a locking mechanism with an integrated push rod shaft electromagnet structure. The locking function of the braking system is realized by arranging the locking mechanism on the transmission path. The specific locking method is that the electromagnet is arranged as a driving device in the MGU housing cavity. At the same time, the gear with the locking groove structure is fixed on the MGU housing through a pin. The locking groove is integrated on the double gear. When parking and locking, the electromagnet is energized. Through the extension and retraction of the electromagnet push rod shaft, the locking head is made to cooperate with and unlock the locking groove on the gear, so as to realize the locking function of the entire braking system.

[0049] When parking and locking, due to the existence of the parking clamping force, there is a reverse acting force on the transmission route, and this reverse acting force will act on the locking mechanism module through the locking head structure and the push rod all the time, which also raises a certain strength requirement for the electromagnet push rod. This patent proposes to adopt an integrated push rod shaft, integrate the locking head structure and the push rod, and at the same time integrate the anti-rotation structure and the push rod. The pressure-bearing part (push rod shaft) is manufactured as a whole by an integral processing technology. While realizing the functions of the components, it not only reduces the component assembly process, but also increases the strength of the push rod shaft, optimizes the component design, and reduces the manufacturing cost.

[0050] The locking mechanism with an integrated push rod shaft electromagnet structure has the following advantages: 1. Increase the integration of components: Multiple functions are concentrated on one part, reducing the number of assembled parts, making the product design more compact and saving costs; 2. Increase the strength of components: The pressure-bearing part (push rod shaft) is manufactured as a whole by an integral processing technology, increasing the strength of the push rod shaft; 3. Reduce noise: The integrated design minimizes the mass of the moving impact parts, reduces the impact sound between the electromagnet and the double gear when the electromagnet acts, and reduces noise.

[0051] Embodiment 1:

[0052] As shown in the schematic Figures 4 to 6As shown, it is an overall view of the electromagnet push rod shaft. The shaft is made of 303 stainless steel, slightly magnetic. The whole shaft is formed by cold forging and manufacturing process. The upper section is the locking section 1a1 of the push rod shaft, the middle section is the anti-rotation section 1a2 of the push rod shaft, and the bottom section is the assembly section 1a3 of the push rod shaft. The locking section includes a locking head, and the locking head includes a locking end face 1a1-1 and a non-locking end face 1a1-2. The slope of the locking end face 1a1-1 is less than that of the non-locking end face 1a1-1, that is, a locking surface with a small slope and a non-locking surface with a large slope are formed. The locking head with an inclined surface cooperates with the locking groove of the transmission gear, which can improve the stability of locking. The anti-rotation section is a cylindrical structure with a quadrilateral cross-section, and the assembly section is a cylindrical structure with a circular cross-section.

[0053] As shown in the schematic Figure 7 shown, it is an overall view of the electromagnet push rod shaft (another form relative to the schematic Figure 4 ). The shaft is made of 303 stainless steel, slightly magnetic. The whole shaft is formed by machining a round bar. The whole section is a cylindrical bar, and each structure is made by machining. Among them, the upper section is the locking section 1a1 of the push rod shaft, the middle section is the anti-rotation section 1a2 of the push rod shaft, and the bottom section is the assembly section 1a3 of the push rod shaft. The locking section includes a locking head, and the locking head includes a locking end face (small slope face) and a non-locking end face (large slope face). A plane is machined on the cylinder of the anti-rotation section to cooperate with the plane of the static iron core for anti-rotation. The assembly section is a cylindrical structure with a circular cross-section (the processing form of this push rod shaft is not limited by the above two forms, and there are other manufacturing processes, and the corresponding structures can be adaptively adjusted according to the relevant processing technology).

[0054] As shown in the schematic Figure 3 shown, it is a cross-sectional view of an electromagnet. It can be seen from the view that the coil windings 1h / 1g are arranged on the coil bracket 1d. The coil winding bracket is arranged in the electromagnet housing 1b. The static iron core 1e is arranged at the bottom end of the electromagnet housing. The central hole is a round hole, which is assembled and connected with the assembly section of the electromagnet push rod. The electromagnet end cover 1c is riveted to the electromagnet housing. The static iron core 1i is arranged in the middle of the electromagnet end cover. The central hole is a square hole, which is assembled and connected with the anti-rotation section of the electromagnet push rod. The electromagnet push rod 1a is fixedly connected with the static iron core 1f, and the electromagnet push rod is axially arranged through the static iron core.

[0055] As shown in the schematic Figure 1 and the schematic Figure 2 shown: It is an overall view when the electromagnet push rod is pushed out and retracted. When parking and locking, the electromagnet is energized forward. Under the action of the coil magnetic field, the push rod shaft and the moving iron core are axially pushed out, and the locking head forms a fit with the locking groove of the double gear to complete the locking. When locking, the state of the electromagnet push rod is as Figure 1As shown in the figure, when the parking lock is released, the electromagnet is energized in the reverse direction. Under the action of the coil magnetic field, the push rod shaft and the moving iron core axially retract, and the locking head is decoupled from the locking groove of the double gear, completing the locking release. When the locking release occurs, the state of the electromagnet push rod is as shown in Figure 2 the figure.

[0056] Embodiment 2:

[0057] As shown in the schematic Figure 10 and schematic Figure 11 figures, it is an exploded view of an MGU of a locking mechanism with an integrated push rod shaft electromagnet structure. The brushless motor 2 is arranged in the corresponding cavity of the actuator housing 3. The shaft pin 5 is press-fitted into the actuator housing with interference. The shaft pin and the brushless motor shaft are arranged axially parallel. The double gear 4 is assembled on the actuator housing through the shaft pin. The electromagnet assembly 1 is arranged in the electromagnet installation cavity 3a of the actuator housing. The ECU housing 7 is fixedly connected to the actuator housing. The circuit board 6 is arranged in the ECU housing. The ECU housing cover 8 is fixedly connected to the ECU housing.

[0058] When the parking lock is engaged, the ECU transmits the locking command to the electromagnet assembly through the bus bar. The electromagnet assembly is energized, and the electromagnet push rod and the moving iron core extend. The head of the push rod extends into the locking groove on the end face of the double gear, and the push rod and the locking groove are matched to restrict the rotation of the double gear, thereby realizing the locking function. When the parking lock is released, the ECU transmits the release command to the electromagnet assembly through the bus bar. The electromagnet is energized in the reverse direction, the electromagnet push rod and the moving iron core retract, the head of the push rod retracts outside the locking groove on the end face of the double gear, the push rod and the locking groove are decoupled, and the rotation of the double gear is not restricted by the push rod, thereby realizing the release of the parking lock.

[0059] The above is only a description of the preferred embodiments of the present invention. The above technical features can be combined arbitrarily to form multiple embodiment schemes of the present invention.

[0060] The present invention has been described exemplarily above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited by the above methods. As long as various non-substantive improvements are made by adopting the concept and technical solutions of the present invention, or the concept and technical solutions of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A locking mechanism, comprising an electromagnet housing, a push rod shaft, a stationary iron core and a moving iron core disposed in the electromagnet housing, and an electromagnet coil winding disposed around the iron core, Characterized in that: The push rod shaft is an integral rod shaft structure that is connected to the moving iron core and can be telescoped, and a locking portion is formed at its end for cooperating with a locking groove on a transmission gear for locking and unlocking.

2. The locking mechanism according to claim 1, Characterized in that: An anti-rotation section and a mating section are also integrated on the push rod shaft, and the push rod shaft is fixedly connected to the moving iron core through the mating section.

3. The locking mechanism according to claim 1, Characterized in that: The push rod shaft is an integrally formed one-piece shaft structure.

4. The locking mechanism according to claim 1, Characterized in that: The locking portion of the push rod shaft includes a locking end face and a non-locking end face that are oppositely arranged. Both the locking end face and the non-locking end face are inclined planes, and the slope of the locking end face is smaller than the slope of the non-locking end face.

5. The locking mechanism according to claim 2, Characterized in that: An anti-rotation hole for preventing the push rod shaft from rotating is provided on the stationary iron core, and the anti-rotation section cooperates with the anti-rotation hole.

6. The locking mechanism according to claim 2, Characterized in that: The mating section of the push rod shaft and the moving iron core are fixedly fitted by interference press fitting or spline riveting.

7. The locking mechanism according to claim 5, Characterized in that: The anti-rotation section on the push rod shaft is arranged adjacent to the locking portion.

8. The locking mechanism according to claim 5, Characterized in that: The stationary iron core includes a pair of stationary iron cores that are oppositely arranged. One stationary iron core is disposed on the top of the electromagnet housing, and the other stationary iron core is disposed on the bottom of the electromagnet housing. An anti-rotation hole is provided on the stationary iron core at the top, and a round hole for movably cooperating with the lower part of the push rod shaft is provided on the stationary iron core at the bottom.

9. The locking mechanism according to claim 8, Characterized in that: The anti-rotation hole is arranged along the central axis of the stationary iron core at the top.

10. A parking brake locking device, comprising an actuator housing, a double gear and a locking motor. The locking motor is connected to the double gear, and a locking groove is provided on the double gear, Characterized in that: It further includes the locking mechanism according to any one of claims 1 to 9, and the locking portion at the end of the push rod shaft is arranged corresponding to the locking groove.

11. A vehicle, Characterized in that: It includes the parking brake locking device according to claim 10.

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