Pure electric booster cylinder

Abstract

The utility model relates to a pure electric booster cylinder. Comprising an installation plate, a motor, a shell, a ball screw assembly, a piston rod assembly, a connector assembly and a transmission assembly, the motor, the transmission assembly and the shell are installed on the installation plate, the piston rod assembly and the ball screw assembly are arranged in the shell, and a nut of the ball screw assembly is connected with the piston rod assembly through a bolt. The other end of a piston rod of the piston rod assembly penetrates out of the shell and is connected with the connector assembly, the motor drives the ball screw assembly to rotate through the transmission assembly, the ball screw assembly drives the piston rod assembly to move, and the piston rod assembly drives the connector assembly to move. Hydraulic oil in the prior art is replaced, the structure is simple, the environmental protection performance is high, motor control is adopted, and the positioning precision is high. The ball screw transmission is adopted, and safety and reliability are achieved. And the device is suitable for all vehicle types, high in adaptability and wide in application range.

Description

Technical Field

[0001] The utility model relates to the field of automotive power cylinders, and more specifically to a pure electric power cylinder. Background Art

[0002] The steering power cylinder is one of the automotive steering assist devices. With the strong promotion of new energy technologies, the awareness of environmental protection has gradually increased. The application of transmission hydraulic oil in the automotive field has gradually decreased. To adapt to the development trend, and coupled with the advantages of practicality, reliability, and good economy of the electric power cylinder, the application of the electric power cylinder in the automotive field has gradually increased. In commercial vehicles, the power cylinders used for the second-axle steering are also synchronously updated to electric assist products with clean energy as the main medium. There is an urgent need for a pure electric power cylinder to adapt to the above development. Summary of the Utility Model

[0003] The purpose of the utility model is to provide a pure electric power cylinder, which is a pure electric assist power cylinder with clean energy as the main medium. The power cylinder has a simple structure, strong environmental protection, high positioning accuracy, and wide application.

[0004] The technical solution of the utility model:

[0005] A pure electric power cylinder includes a mounting plate, a motor, a housing, a ball screw assembly, a piston rod assembly, a joint assembly, and a transmission assembly. The motor, the transmission assembly, and the housing are mounted on the mounting plate. The piston rod assembly and the ball screw assembly are arranged in the housing. The nut of the ball screw assembly is connected to the piston rod assembly by bolts. The other end of the piston rod of the piston rod assembly passes through the housing and is connected to the joint assembly. The motor drives the ball screw assembly to rotate through the transmission assembly. The ball screw assembly drives the piston rod assembly to move, and the piston rod assembly drives the joint assembly to move.

[0006] Advantages of the Utility Model

[0007] 1. The pure electric power cylinder of the present application uses clean energy electric energy as the main medium to replace the hydraulic oil in the prior art. It has a simple structure, strong environmental protection, and is controlled by a motor with high positioning accuracy. The present application uses ball screw transmission, which is safe and reliable. It can be applied to all vehicle models, has strong adaptability, and wide application. Description of the Drawings

[0008] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the provided drawings.

[0009] Figure 1 This is a schematic diagram of the overall structure of the pure electric power cylinder of the present application.

[0010] Figure 2 This is an assembly schematic diagram of the pure electric power cylinder of the present application.

[0011] Figure 3 This is a schematic diagram of the ball screw assembly with deep groove ball bearings of the present application.

[0012] Figure 4 This is a schematic diagram of the piston rod assembly of the present application.

[0013] Figure 5 This is an assembly schematic diagram of the ball screw assembly and the piston rod assembly of the present application.

[0014] Reference numerals: mounting plate 1; motor 2; housing 3; piston rod assembly 4; ball screw assembly 5; joint assembly 6; transmission assembly 7; nut 8; upper cover 31; bracket 32; dust-proof end plate 33; piston rod 41; mounting seat 42; guide sleeve 43; lead screw 51; nut 52; bearing 53; keyway 54; first gear 71; second gear 72; gear cover 73. Detailed implementation manners

[0015] In order to solve the problems in the background art, the present application particularly invents a pure electric power cylinder with an external motor in the field of automotive technology, which has a simple structure, strong environmental protection, high positioning accuracy, strong adaptability, safety and reliability, and wide application.

[0016] It should be noted that in the description of the present application, the terms "upper", "lower", "left", "right", "inner", "outer", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present application.

[0017] A pure electric power cylinder includes a mounting plate 1, a motor 2, a housing 3, a piston rod assembly 4, a ball screw assembly 5, a joint assembly 6, and a transmission assembly 7. The motor 2, the transmission assembly 7, and the housing 3 are mounted on the mounting plate 1. The piston rod assembly and the ball screw assembly are arranged in the housing. The nut of the ball screw assembly is connected to the piston rod assembly by bolts, and the other end of the piston rod of the piston rod assembly passes through the housing and is connected to the joint assembly. The motor drives the ball screw assembly to rotate through the transmission assembly, the ball screw assembly drives the piston rod assembly to move, and the piston rod assembly drives the joint assembly to move.

[0018] The ball screw assembly 5 includes a screw rod 51, a nut 52 and two bearings 53. The nut is assembled on the screw rod, and bearings (preferably deep groove ball bearings) are installed at both ends of the screw rod. A keyway 54 is provided at one end of the screw rod facing the mounting plate, and the keyway is used to connect with the second gear.

[0019] The piston rod assembly 4 includes a piston rod 41, a mounting seat 42 and a guide sleeve 43. A mounting seat is installed at one end of the piston rod, a guide sleeve is installed in the middle of the piston rod, the other end of the piston rod is threadedly connected with the joint assembly, the mounting seat is bolted to the nut of the ball screw assembly, a locknut 8 is installed at one end of the piston rod passing through the mounting seat, and the guide sleeve can slide relative to the piston rod.

[0020] The transmission assembly 7 includes a first gear 71, a second gear 72 and a gear cover 73. The gear cover is bolted to the mounting plate. The first gear and the second gear are placed inside the gear cover. The output shaft of the motor passes through the mounting plate and is key-connected to the first gear. The first gear and the second gear are meshed, the second gear is key-connected to the piston rod, and a nut 8 is installed at the end of the piston rod extending out of the second gear.

[0021] The housing 3 includes an upper cover 31, a bracket 32 and a dust-proof end plate 33. The upper cover and the bracket are connected by screws. The housing is in mating of spigot and flange connection with the mounting plate. The dust-proof end plate is connected to the side of the ball screw assembly at one end of the upper cover and the bracket away from the mounting plate by screws. A seal (i.e., a seal is installed in the gap between the guide sleeve and the housing) is installed between the guide sleeve and the side of the piston rod at one end of the upper cover and the bracket away from the mounting plate. Bearing grooves and guide sleeve grooves are provided at one end of the upper cover and the bracket away from the mounting plate, and the bearings and the guide sleeve are respectively installed in the bearing grooves and the guide sleeve grooves.

[0022] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts shall fall within the protection scope of the present application.

[0023] As Figure 1 、 2 shown, the pure electric power assist cylinder of the present application mainly includes a gear cover, a mounting plate, a motor, an upper cover, a bracket, a dust-proof end cover, a joint assembly (a maintenance-free joint assembly can be used), a first gear, a second gear, a ball screw assembly, a screw rod, a nut, a piston rod assembly, a piston rod, a guide sleeve, a nut, a deep groove ball bearing, a locknut for preventing loosening and other components.

[0024] As Figure 3As shown, deep groove ball bearings are installed at both ends of the ball screw assembly. A flat surface is machined on one side of the nut, and two threaded holes are drilled at both ends of the flat surface for connecting to the mounting seat at one end of the piston rod. A keyway is machined on the long end of the screw (towards the mounting plate end) to facilitate the assembly with the second gear.

[0025] As Figure 4 shown, a mounting seat is fixedly installed at one end of the piston rod assembly towards the mounting plate. A locknut is screwed on the left side of the mounting seat in the figure to firmly install the mounting seat on the piston rod. Two through holes are reserved on the mounting seat for connecting to the nut of the ball screw assembly through screws. A guide sleeve is installed at the middle position of the piston rod. At this time, the guide sleeve can move freely on the piston rod to facilitate adjustment to the appropriate position during subsequent assembly. A long thread is machined at one end of the piston rod towards the joint assembly for connecting to the maintenance-free joint assembly.

[0026] As Figure 5 shown, the ball screw assembly and the piston rod assembly are connected into one body by screws and installed in the cavity between the bracket and the upper cover to meet the requirements of the later assembly of the product assembly.

[0027] As Figure 2 shown, place the Figure 5 assembly parts into the corresponding positions of the bracket. The bearings and the guide sleeve are respectively installed in the bearing groove and the guide sleeve groove. Connect the upper cover to the bracket with screws, and install a seal in the reserved annular groove outside the guide sleeve for sealing between the guide sleeve, the upper cover and the bracket. Press-fit the second gear on the outer circle of the screw with the key installed, and lock it with a nut on the outside. Press-fit the first gear onto the output shaft of the motor. Install the gear cover to the mounting plate with screws. Finally, screw the maintenance-free joint assembly onto the long thread at the long end of the piston rod.

[0028] Installation process: The piston assembly and the ball screw assembly are connected into a whole by screws. After adjusting the positions of all components, install them into the corresponding mounting grooves of the bracket, and buckle the upper cover on the bracket and fix it around with screws. The motor is connected to the mounting plate with screws and connected to the first gear through a common flat key at the output shaft end. The end of the housing is fitted with the mounting plate's rabbet and flange-connected. The ball screw passes through this rabbet. A common flat key is installed in the keyway of the ball screw. The second gear is press-fitted onto the ball screw on the other side of the mounting plate, and is locked and fixed with a nut on the outside of the second gear. The maintenance-free joint assembly is installed on the external thread at the long right end of the piston rod.

[0029] According to the loading requirements of different customers, the structural form of the mounting plate can be appropriately adjusted and improved to meet the loading requirements of different vehicle models and different positions.

[0030] The pure electric power cylinder of this application uses electric energy as the main medium, with a simple structure, strong environmental protection, high positioning accuracy, strong adaptability, safety and reliability, and wide application.

[0031] The above has schematically described the present utility model and its implementation manners. This description is not restrictive. What is shown in the drawings is only one of the implementation manners of the present utility model, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and, without departing from the content of the technical solution of the present utility model, design similar structural manners and implementations to the above implementation examples without creative efforts based on the technical essence of the present utility model, they shall all fall within the protection scope of the present utility model.

Claims

1. An electric power cylinder, characterized in that: It includes a mounting plate, a motor, a housing, a ball screw assembly, a piston rod assembly, a joint assembly, and a transmission component. The motor, the transmission component, and the housing are mounted on the mounting plate. The piston rod assembly and the ball screw assembly are arranged inside the housing. The nut of the ball screw assembly is connected to the piston rod assembly by bolts. The other end of the piston rod of the piston rod assembly passes through the housing and is connected to the joint assembly. The motor drives the ball screw assembly to rotate through the transmission component, the ball screw assembly drives the piston rod assembly to move, and the piston rod assembly drives the joint assembly to move.

2. The pure electric power cylinder according to claim 1, characterized in that: The ball screw assembly includes a screw, a nut, and two bearings. The nut is assembled on the screw. Bearings are installed at both ends of the screw. A keyway is provided at one end of the screw facing the mounting plate.

3. A pure electric power cylinder according to claim 1 or 2, characterized in that: The piston rod assembly includes a piston rod, a mounting seat, and a guide sleeve. A mounting seat is installed at one end of the piston rod. A guide sleeve is installed in the middle of the piston rod. The other end of the piston rod is threadedly connected to the joint assembly. The mounting seat is connected to the nut of the ball screw assembly. A nut is installed on the end of the piston rod passing through the mounting seat. The guide sleeve can slide relative to the piston rod.

4. A pure electric power cylinder according to claim 1, characterized in that: The transmission component includes a first gear, a second gear, and a gear cover. The gear cover is bolted to the mounting plate. The first gear and the second gear are placed inside the gear cover. The output shaft of the motor passes through the mounting plate and is key-connected to the first gear. The first gear and the second gear are meshed. The second gear is key-connected to the piston rod. A nut is installed on the end of the piston rod extending out of the second gear.

5. The pure electric assist cylinder according to claim 3, characterized in that: The housing includes an upper cover, a bracket, and a dust-proof end plate. The upper cover and the bracket are connected by screws. The housing is in mating with a spigot and flange-connected to the mounting plate. The dust-proof end plate is connected to the side of the ball screw assembly at the end of the upper cover and the bracket away from the mounting plate by screws. A seal is installed between the side of the piston rod at the end of the upper cover and the bracket away from the mounting plate and the guide sleeve. Bearing grooves and guide sleeve grooves are provided at the end of the upper cover and the bracket away from the mounting plate. The bearings and the guide sleeve are respectively installed in the bearing grooves and the guide sleeve grooves.

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