Electric steering gear and vehicle

Abstract

The utility model belongs to the technical field of heavy-duty commercial vehicles, and discloses an electric steering gear and a vehicle, the electric steering gear comprises a machine shell, a motor, a three-stage gear set, a steering screw, a steering nut and a rocker arm, the rocker arm and the motor are located on the same side of the steering screw, and the vehicle comprises a vehicle body and the electric steering gear. According to the electric steering gear, the transmission efficiency of gear meshing is higher than that of a worm gear and a worm, it is guaranteed that the overall output torque and working efficiency of the electric steering gear can meet the requirements of heavy commercial vehicles, and the distance between the axis of the motor output shaft and the axis of the steering screw is effectively increased through the design of the three-stage gear set; according to the electric steering gear, the motor and the rocker arm can be arranged on the same side of the steering screw, meanwhile, due to the arbitrary rotation of the gear, the position of the three-stage gear set can be adaptively adjusted according to the requirement of the whole vehicle arrangement space, and the arrangement performance of the electric steering gear is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of heavy commercial vehicles, in particular to an electric steering gear and a vehicle. Background Art

[0002] On existing vehicles, the reduction mechanism in the commonly used electric steering gear is usually configured as a one-stage worm gear reduction mechanism. This type of electric steering gear cannot bear a large torque and can only meet the output torque requirements of light commercial trucks, but cannot meet the torque output needs of medium and heavy commercial vehicles. In addition, since the conventional one-stage worm gear reduction mechanism has a relatively fixed spatial position during layout, it often interferes with the overall vehicle shape and space, making it difficult to meet the higher vehicle clearance requirements.

[0003] In view of the above problems, in the prior art, an electric steering gear equipped with a gear transmission reduction mechanism is designed for heavy commercial vehicles. However, the gear transmission reduction mechanism in this electric steering gear has only two-stage gears, so that the distance between the axis of the motor output shaft and the axis of the steering screw is too small, so that the motor and the rocker arm can only be arranged on the sides, so that the motor is arranged at the front end of the vehicle body, occupying the layout space of the whole vehicle. The space at the front end of the vehicle body is small, making it difficult to flexibly arrange the electric steering gear. Utility Model Content

[0004] The utility model aims to provide an electric steering gear and a vehicle, which can meet the larger output torque requirements of heavy commercial vehicles and have a flexible arrangement position on the vehicle.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] Electric steering gear, including:

[0007] chassis;

[0008] A motor, mounted on the housing;

[0009] A three-stage gear set, comprising a primary driving gear, a primary driven gear, a secondary driving gear, a secondary driven gear, a third driving gear and a third driven gear, wherein the primary driving gear is coaxially fixedly connected to the output end of the motor, the primary driven gear is rotatably mounted on the housing and meshed with the primary driving gear, the secondary driving gear is coaxially fixedly connected to the primary driven gear, the secondary driven gear is rotatably mounted on the housing and meshed with the secondary driving gear, the third driving gear is coaxially fixedly connected to the secondary driven gear, the third driven gear is rotatably mounted on the housing and meshed with the third driving gear;

[0010] A steering screw, coaxially fixed to the three-stage driven gear;

[0011] A steering nut, threadedly connected to the steering screw, and the steering nut is provided with a rack portion;

[0012] A rocker arm is rotatably mounted on the housing, the rocker arm and the motor are located on the same side of the steering screw, and a tooth sector portion is provided on the rocker arm, and the tooth sector portion is meshed with the rack portion.

[0013] Preferably, the axis of the first-stage driving gear, the axis of the first-stage driven gear, the axis of the third-stage driving gear and the axis of the third-stage driven gear are located in a first plane.

[0014] Preferably, the first-stage driving gear, the first-stage driven gear, the third-stage driving gear and the third-stage driven gear are located in a second plane, the second-stage driving gear and the second-stage driven gear are located in a third plane, and the third plane is located on a side of the second plane away from the rocker arm.

[0015] Preferably, the diameter of the primary driving gear is smaller than the diameter of the primary driven gear, the diameter of the secondary driving gear is smaller than the diameter of the secondary driven gear, and the diameter of the tertiary driving gear is smaller than the diameter of the tertiary driven gear.

[0016] Preferably, it further comprises a first gear shaft, wherein the first gear shaft is mounted on the housing and can rotate around its own axis, and the first-stage driving gear is fixedly mounted on the first gear shaft.

[0017] Preferably, it further comprises a second gear shaft, which is mounted on the housing and can rotate around its own axis, and the first-stage driven gear and the second-stage driving gear are fixedly mounted on the second gear shaft.

[0018] Preferably, it further comprises a third gear shaft, which is mounted on the housing and can rotate around its own axis, and the secondary driven gear and the tertiary driving gear are fixedly mounted on the third gear shaft.

[0019] Preferably, a locking nut is further included, the steering screw is mounted on the housing and can rotate around its own axis, and the three-stage driven gear is fixed to one end of the steering screw through the locking nut.

[0020] Preferably, the housing comprises:

[0021] A main housing, wherein a first and a second installation passage are provided on the main housing and are perpendicular to and connected to each other, the steering screw is installed in the first installation passage, and the rocker arm is installed in the second installation passage;

[0022] A top cover, mounted on one end of the first dressing passage;

[0023] A transmission upper cover, mounted at the other end of the first installation passage;

[0024] The transmission lower cover is installed on the side of the transmission upper cover away from the main housing, and the transmission upper cover and the transmission lower cover are surrounded to form a transmission cavity, and the first-stage driving gear, the first-stage driven gear, the second-stage driving gear, the second-stage driven gear, the third-stage driving gear and the third-stage driven gear are installed in the transmission cavity.

[0025] A vehicle comprises a vehicle body and the above-mentioned electric steering gear.

[0026] Beneficial effects of the utility model:

[0027] The transmission efficiency of gear meshing is higher than that of the worm gear, ensuring that the overall output torque and working efficiency of the electric steering gear can meet the needs of heavy-duty commercial vehicles. The design of the three-stage gear set effectively increases the distance between the axis of the motor output shaft and the axis of the steering screw, so that the motor and the rocker arm can be arranged on the same side of the steering screw. At the same time, due to the arbitrary rotation of the gears, the position of the three-stage gear set can be adaptively adjusted according to the requirements of the vehicle layout space, thereby improving the arrangeability of the electric steering gear. In addition, the speed ratio of the electric steering gear can be simply adjusted by changing the pitch circle size of the three driven gears. Moreover, since the spatial position of the motor is on the same side as the rocker arm, the front end space of the vehicle body is effectively optimized to ensure that the electric steering gear is arranged at the specified position. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a front view of the electric steering gear according to an embodiment of the utility model;

[0029] Figure 2 is a side view of the electric steering gear according to an embodiment of the utility model;

[0030] Figure 3 It is a front view of a partial structure of the electric steering gear according to an embodiment of the utility model;

[0031] Figure 4 It is a top view of a part of the structure of the electric steering gear according to an embodiment of the utility model;

[0032] Figure 5 It is a front view of the matching three-stage gear set, the first gear shaft, the second gear shaft and the third gear shaft described in the embodiment of the utility model.

[0033] In the figure:

[0034] 1. Casing; 11. Main housing; 12. Top cover; 13. Transmission upper cover; 14. Transmission lower cover;

[0035] 2. Motor;

[0036] 3. Three-stage gear set; 31. First-stage driving gear; 32. First-stage driven gear; 33. Second-stage driving gear; 34. Second-stage driven gear; 35. Third-stage driving gear; 36. Third-stage driven gear;

[0037] 4. Steering screw;

[0038] 5. Rocker arm;

[0039] 6. First gear shaft;

[0040] 7. Second gear shaft;

[0041] 8. Third gear shaft;

[0042] 9. Lock nut. DETAILED DESCRIPTION

[0043] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar components or components having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0044] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, it can be a mechanical connection or an electrical connection, it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In the description of the present utility model, unless otherwise clearly stipulated and limited, a first feature being "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0046] The technical solution of the utility model is further explained below with reference to the accompanying drawings and through specific implementation methods.

[0047] like Figure 1-Figure 5As shown, the utility model provides an electric steering gear, including a housing 1, a motor 2, a three-stage gear set 3, a steering screw 4, a steering nut and a rocker arm 5. The motor 2 is mounted on the housing 1, and the three-stage gear set 3 includes a primary driving gear 31, a primary driven gear 32, a secondary driving gear 33, a secondary driven gear 34, a third driving gear 35 and a third driven gear 36. The primary driving gear 31 is coaxially fixed to the output end of the motor 2, the primary driven gear 32 is rotatably mounted on the housing 1 and meshes with the primary driving gear 31, the secondary driving gear 33 is coaxially fixed to the primary driven gear 32, and the secondary driven gear 34 is rotatably mounted on the housing 1. , and meshes with the secondary driving gear 33, the tertiary driving gear 35 is coaxially fixed to the secondary driven gear 34, the tertiary driven gear 36 is rotatably mounted on the casing 1, and meshes with the tertiary driving gear 35, the steering screw 4 is coaxially fixed to the tertiary driven gear 36, the steering nut is screwed to the steering screw 4, a rack portion is provided on the steering nut, the rocker arm 5 is rotatably mounted on the casing 1, the rocker arm 5 and the motor 2 are located on the same side of the steering screw 4, the rocker arm 5 is provided with a gear sector portion, and the gear sector portion meshes with the rack portion.

[0048] In the utility model, the transmission efficiency of the gear meshing is higher than that of the worm gear, ensuring that the overall output torque and working efficiency of the electric steering gear can meet the needs of heavy-duty commercial vehicles. The design of the three-stage gear set 3 effectively increases the distance between the axis of the output shaft of the motor 2 and the axis of the steering screw 4, so that the motor 2 and the rocker arm 5 can be arranged on the same side of the steering screw 4. At the same time, due to the arbitrary rotation of the gears, the position of the three-stage gear set 3 can be adaptively adjusted according to the requirements of the vehicle layout space, thereby improving the arrangeability of the electric steering gear. In addition, the speed ratio of the electric steering gear can be simply adjusted by changing the pitch circle size of the three driven gears.

[0049] In this embodiment, the first-stage driving gear 31, the first-stage driven gear 32, the second-stage driving gear 33, the second-stage driven gear 34, the third-stage driving gear 35 and the third-stage driven gear 36 can be cylindrical gears or bevel gears, or composite materials, which can reduce noise and weight while meeting the strength requirements. The rack portion on the steering nut extends along the axis of the steering nut, and the axis of the tooth sector portion on the rocker arm 5 is coaxial with the axis of the rocker arm 5.

[0050] Specifically, the axis of the primary driving gear 31, the axis of the primary driven gear 32, the axis of the tertiary driving gear 35 and the axis of the tertiary driven gear 36 are located in the first plane. The above arrangement further increases the spacing between the axis of the output shaft of the motor 2 and the axis of the steering screw 4, providing space for the installation of the rocker arm 5.

[0051] More specifically, the primary driving gear 31, the primary driven gear 32, the tertiary driving gear 35 and the tertiary driven gear 36 are located in the second plane, the secondary driving gear 33 and the secondary driven gear 34 are located in the third plane, and the third plane is located on the side of the second plane away from the rocker arm 5. The above arrangement avoids the interference of the secondary driving gear 33 and the secondary driven gear 34 with the rocker arm 5, further increases the distance between the axis of the output shaft of the motor 2 and the axis of the steering screw 4, and provides space for the installation of the rocker arm 5.

[0052] More specifically, the diameter of the primary driving gear 31 is smaller than the diameter of the primary driven gear 32, the diameter of the secondary driving gear 33 is smaller than the diameter of the secondary driven gear 34, and the diameter of the tertiary driving gear 35 is smaller than the diameter of the tertiary driven gear 36. The above arrangement ensures the overall output torque and working efficiency of the electric steering gear.

[0053] In this embodiment, the second plane and the third plane are parallel to each other and spaced apart, the first plane is perpendicular to the second plane and the third plane, and the first-stage driven gear 32, the second-stage driven gear 34 and the third-stage driven gear 36 are all processed with weight-reducing holes.

[0054] In another embodiment, the third plane may be located on the side of the second plane facing the rocker arm 5. In another embodiment, the axis of the primary driving gear 31 and the axis of the primary driven gear 32 may be on the same plane, the axis of the tertiary driving gear 35 and the axis of the tertiary driven gear 36 may be on the same plane, and the two planes may be arranged at an angle.

[0055] Specifically, the housing 1 includes a main housing 11, a top cover 12, a transmission upper cover 13 and a transmission lower cover 14. The main housing 11 is provided with a first and a second installation passage that are perpendicular to each other and communicate with each other, the steering screw 4 is installed in the first installation passage, the rocker arm 5 is installed in the second installation passage, the top cover 12 is installed at one end of the first installation passage, the transmission upper cover 13 is installed at the other end of the first installation passage, the transmission lower cover 14 is installed on the side of the transmission upper cover 13 away from the main housing 11, the transmission upper cover 13 and the transmission lower cover 14 are surrounded to form a transmission cavity, and the first-stage driving gear 31, the first-stage driven gear 32, the second-stage driving gear 33, the second-stage driven gear 34, the third-stage driving gear 35 and the third-stage driven gear 36 are installed in the transmission cavity. The above arrangement facilitates the disassembly and assembly of the primary driving gear 31 , the primary driven gear 32 , the secondary driving gear 33 , the secondary driven gear 34 , the tertiary driving gear 35 , the tertiary driven gear 36 , the steering screw 4 , the steering nut and the rocker arm 5 in the housing 1 .

[0056] In this embodiment, the main housing 11, the top cover 12, the transmission upper cover 13 and the transmission lower cover 14 are fastened together by bolts, so as to facilitate assembly and disassembly.

[0057] Specifically, the electric steering gear further comprises a first gear shaft 6, which is mounted on the housing 1 and can rotate around its own axis, and the primary driving gear 31 is fixedly mounted on the first gear shaft 6. The above arrangement makes the primary driving gear 31 more stable and reliable when rotating.

[0058] More specifically, the electric steering gear further comprises a second gear shaft 7, which is mounted on the housing 1 and can rotate around its own axis, and the primary driven gear 32 and the secondary driving gear 33 are fixedly mounted on the second gear shaft 7. The above arrangement makes the primary driven gear 32 and the secondary driving gear 33 more stable and reliable when rotating.

[0059] Specifically, the electric steering gear further includes a third gear shaft 8, which is mounted on the housing 1 and can rotate around its own axis, and the secondary driven gear 34 and the tertiary driving gear 35 are fixedly mounted on the third gear shaft 8. The above arrangement makes the secondary driven gear 34 and the tertiary driving gear 35 more stable and reliable when rotating.

[0060] More specifically, the electric steering gear further includes a locking nut 9, the steering screw 4 is mounted on the housing 1 and can rotate around its own axis, and the three-stage driven gear 36 is fixed to one end of the steering screw 4 through the locking nut 9. The above arrangement enables the three-stage driven gear 36 to more reliably drive the steering screw 4 to rotate.

[0061] In this embodiment, bearings are installed on both sides of the first gear shaft 6, the second gear shaft 7 and the third gear shaft 8. The first gear shaft 6, the second gear shaft 7 and the third gear shaft 8 are rotatably mounted on the housing 1 through the bearings, and the bearings are press-fitted into the transmission upper cover 13 and the transmission lower cover 14. The first-stage driven gear 32, the second-stage driven gear 34 and the third-stage driven gear 36 can all be adjusted in size. As the size of the driven gear changes, the speed ratio of the electric steering gear also changes. The above structure can realize the arrangement of the motor 2 and the rocker arm 5 on the same side. Under the premise of taking into account the layout space of the whole vehicle, the output torque requirements of the steering gear of medium and heavy commercial vehicles can be met with higher mechanical efficiency.

[0062] In the electric steering gear of this embodiment, the primary driving gear 31 is pressed onto the first gear shaft 6, which is fixed in the transmission upper cover 13 and the transmission lower cover 14 through bearings, the primary driven gear 32 and the secondary driving gear 33 are pressed onto the second gear shaft 7, which is fixed in the transmission upper cover 13 and the transmission lower cover 14 through bearings, the secondary driven gear 34 and the tertiary driving gear 35 are pressed onto the third gear shaft 8, which is fixed in the transmission upper cover 13 and the transmission lower cover 14 through bearings. When the motor 2 provides power assistance, the first gear shaft 6 is driven to rotate through the coupling, the primary driving gear 31 pressed onto the first gear shaft 6 drives the primary driven gear 32, the secondary driving gear 33 drives the secondary driven gear 34 under the rotation of the second gear shaft 7, the secondary driven gear 34 drives the tertiary driving gear 35 to rotate through the third gear shaft 8, and the tertiary driving gear 35 drives the tertiary driven gear 36 to rotate.

[0063] The steering nut is threaded onto the steering screw 4 to form a combination, which is supported and transmits motion and force through steel balls. The combination is installed in the main housing 11, and axial force support is provided by two bearings installed face to face. The three-stage driven gear 36 is pressed onto the steering screw 4 and locked by the locking nut 9.

[0064] When the motor 2 drives the three-stage gear set 3 to move, the three-stage driven gear 36 pressed on the steering screw 4 drives the steering screw 4 to rotate. The steering screw 4 is decelerated and torque-increased through the circulating ball structure in the steering nut, driving the steering nut to move up and down, and finally drives the rocker arm 5 to move through the gear rack structure, providing the output torque required by the electric steering gear.

[0065] The utility model also provides a vehicle, comprising a vehicle body and the above-mentioned electric steering gear.

[0066] In the vehicle of the utility model, the transmission efficiency of the gear meshing is higher than that of the worm gear, which ensures that the overall output torque and working efficiency of the electric steering gear can meet the needs of heavy-duty commercial vehicles. The design of the three-stage gear set 3 effectively increases the distance between the axis of the output shaft of the motor 2 and the axis of the steering screw 4, so that the motor 2 and the rocker arm 5 can be arranged on the same side of the steering screw 4. At the same time, due to the arbitrary rotation of the gears, the position of the three-stage gear set 3 can be adaptively adjusted according to the requirements of the vehicle layout space, thereby improving the arrangeability of the electric steering gear. In addition, the speed ratio of the electric steering gear can be simply adjusted by changing the pitch circle size of the three driven gears. Moreover, since the spatial position of the motor 2 is on the same side as the rocker arm 5, the front end space of the vehicle body is effectively optimized to ensure that the electric steering gear is arranged at the specified position.

[0067] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the scope of protection of the claims of the present invention.

Claims

1. Electric steering gear, characterized in that: include: Housing (1); A motor (2) is mounted on the housing (1); A three-stage gear set (3), comprising a first-stage driving gear (31), a first-stage driven gear (32), a second-stage driving gear (33), a second-stage driven gear (34), a third-stage driving gear (35) and a third-stage driven gear (36), wherein the first-stage driving gear (31) is coaxially fixedly connected to the output end of the motor (2), the first-stage driven gear (32) is rotatably mounted on the housing (1) and meshes with the first-stage driving gear (31), the second-stage driving gear (33) is coaxially fixedly connected to the first-stage driven gear (32), the second-stage driven gear (34) is rotatably mounted on the housing (1) and meshes with the second-stage driving gear (33), the third-stage driving gear (35) is coaxially fixedly connected to the second-stage driven gear (34), and the third-stage driven gear (36) is rotatably mounted on the housing (1) and meshes with the third-stage driving gear (35); A steering screw (4) coaxially fixed to the third-stage driven gear (36); A steering nut, threadedly connected to the steering screw (4), wherein the steering nut is provided with a rack portion; A rocker arm (5) is rotatably mounted on the housing (1); the rocker arm (5) and the motor (2) are located on the same side of the steering screw (4); a tooth sector portion is provided on the rocker arm (5), and the tooth sector portion is meshed with the rack portion.

2. The electric steering gear according to claim 1, characterized in that: The axis of the first-stage driving gear (31), the axis of the first-stage driven gear (32), the axis of the third-stage driving gear (35) and the axis of the third-stage driven gear (36) are located in a first plane.

3. The electric power steering gear according to claim 1, characterized in that: The first-stage driving gear (31), the first-stage driven gear (32), the third-stage driving gear (35) and the third-stage driven gear (36) are located in a second plane, the second-stage driving gear (33) and the second-stage driven gear (34) are located in a third plane, and the third plane is located on a side of the second plane away from the rocker arm (5).

4. The electric power steering gear according to claim 1, characterized in that: The diameter of the primary driving gear (31) is smaller than the diameter of the primary driven gear (32), the diameter of the secondary driving gear (33) is smaller than the diameter of the secondary driven gear (34), and the diameter of the tertiary driving gear (35) is smaller than the diameter of the tertiary driven gear (36).

5. The electric power steering gear according to claim 1, characterized in that: It also comprises a first gear shaft (6), the first gear shaft (6) being mounted on the housing (1) and being capable of rotating around its own axis, and the first-stage driving gear (31) being fixedly mounted on the first gear shaft (6).

6. The electric power steering gear according to claim 1, characterized in that: It also includes a second gear shaft (7), which is mounted on the housing (1) and can rotate around its own axis, and the first-stage driven gear (32) and the second-stage driving gear (33) are fixedly mounted on the second gear shaft (7).

7. The electric power steering gear according to claim 1, characterized in that: It also includes a third gear shaft (8), which is mounted on the housing (1) and can rotate around its own axis, and the second-stage driven gear (34) and the third-stage driving gear (35) are fixedly mounted on the third gear shaft (8).

8. The electric power steering gear according to claim 1, characterized in that: It also includes a locking nut (9), the steering screw (4) is mounted on the housing (1) and can rotate around its own axis, and the three-stage driven gear (36) is fixed to one end of the steering screw (4) through the locking nut (9).

9. The electric steering gear according to any one of claims 1 to 8, characterized in that: The housing (1) comprises: A main housing (11), wherein a first insertion channel and a second insertion channel which are perpendicular to each other and communicate with each other are provided on the main housing (11), the steering screw (4) is installed in the first insertion channel, and the rocker arm (5) is installed in the second insertion channel; A top cover (12) mounted on one end of the first wearing passage; A transmission upper cover (13), mounted on the other end of the first insertion passage; The transmission lower cover (14) is mounted on a side of the transmission upper cover (13) away from the main housing (11), and the transmission upper cover (13) and the transmission lower cover (14) are arranged to form a transmission cavity, and the first-stage driving gear (31), the first-stage driven gear (32), the second-stage driving gear (33), the second-stage driven gear (34), the third-stage driving gear (35) and the third-stage driven gear (36) are mounted in the transmission cavity.

10. A vehicle, characterized in that It comprises a vehicle body and the electric steering gear as described in any one of claims 1-9.

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