Gear fixing structure for electric push rod

Abstract

The utility model relates to the technical field of electric push rods, in particular to a gear fixing structure for an electric push rod. The gear fixing structure for the electric push rod comprises a lead screw, the lead screw comprises a threaded section and a matching section in the axial direction, the matching section is used for being in power connection with an electric push rod motor, a shaft sleeve is arranged on the outer circle face of the matching section in a sleeved mode, a bearing is arranged outside the shaft sleeve in a sleeved mode, and the axial length of the bearing is larger than that of the shaft sleeve. A driving gear is arranged at the end, away from the threaded section, of the shaft sleeve, an extending part is arranged at the end, close to the shaft sleeve, of gear teeth of the driving gear, and the extending part is embedded between the inner wall of the bearing inner ring and the outer surface of the matching section. The device has the advantages that the axial size can be shortened, and the overall occupied space of the device is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric push rod technical field, concretely is electric push rod gear fixing structure. BACKGROUND

[0002] The patent application with the application number of 201821541170.0 discloses an axial fixing structure of a marine gear box clutch gear, comprising a clutch shaft, a clutch movably connected with the clutch shaft on the clutch shaft, a clutch gear with spline type gear connection with the clutch shaft on the side of the clutch, a piston with movable oil pressure connection with the clutch in the clutch gear, a piston oil hole with communication between the piston and the clutch gear in the clutch shaft, an elastic retaining ring between the piston oil hole and the clutch gear, a locking nut with screw type fixed connection with the clutch shaft between the clutch gear and the clutch shaft, an O-shaped sealing ring between the locking nut and the clutch shaft, and a limiting groove with riveting with the locking nut on the clutch shaft.

[0003] In the above technical solution, the clutch gear is axially limited by the locking nut, thereby solving the problems of difficult disassembly, poor limiting position accuracy and small torque when the clutch is maintained, however, in the above technical solution, the gear on the shaft is axially limited by the nut, and since the nut occupies the axial dimension, the axial dimension of the clutch shaft is increased, thereby increasing the volume of the overall structure of the device, affecting the overall occupied space of the device, and making the flexibility of the device when used poor. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing a gear fixing structure for electric push rod which can shorten the axial dimension of the lead screw.

[0005] To achieve the above-mentioned purpose, the utility model discloses a gear fixing structure for electric push rod, comprising a lead screw, the lead screw comprises a threaded segment and a matching segment along the axial direction, the matching segment is used for power connection with the electric push rod motor, the outer cylindrical surface of the matching segment is sleeved with a shaft sleeve, the shaft sleeve is sleeved with a bearing, the axial length of the bearing is greater than the axial length of the shaft sleeve, the shaft sleeve is provided with a driving gear at one end away from the threaded segment, the gear teeth of the driving gear are provided with an extension part at one end close to the shaft sleeve, and the extension part is embedded between the inner wall of the inner ring of the bearing and the outer surface of the matching segment.

[0006] When the electric push rod works, the driving gear rotates, the driving gear is matched between the bearing inner ring and the shaft sleeve through the extension part, thereby driving the extension part of the driving gear to drive the bearing inner ring and the shaft sleeve to rotate at the same time, when the shaft sleeve rotates, the inner surface friction of the shaft sleeve is greater than the rolling friction between the bearing inner ring and the outer ring, thereby realizing the synchronous rotation of the shaft sleeve and the lead screw.

[0007] The utility model discloses a mode of assembling the extension of the driving gear between the bearing inner ring and the shaft sleeve, without reserving additional mounting space for the locking nut for axially limiting the driving gear in the conventional setting mode, avoiding axially limiting the gear by using the locking nut, significantly shortening the axial dimension of the lead screw to adapt to various installation environments and space limitations, improving the applicability and convenience of the device, and the utility model has the advantages of shortening the axial dimension and reducing the occupied space of the device as a whole.

[0008] As preferred, the matching section comprises a fixed part connected with the threaded section and a connecting part arranged at one end of the fixed part away from the threaded section, the fixed part is matched with the axial length of the shaft sleeve and has a gap with the inner wall of the shaft sleeve, the connecting part penetrates the driving gear, the inner hole of the driving gear and the cross section of the connecting part are hexagonal, and the extension is embedded between the inner wall of the bearing and the outer surface of the connecting part.

[0009] By dividing the matching section into the fixed part for assembling with the shaft sleeve and the connecting part for ensuring the torque transmission performance of the driving gear, the use effect of the lead screw is ensured, wherein the fixed part matched with the shaft sleeve can adapt the lead screw to the bearing with large diameter, so as to improve the fixing stability in the bearing rotation support.

[0010] The inner hole of the driving gear and the cross section of the connecting part are hexagonal, which can ensure the structural strength of the connecting part, compared with the octagonal or polygonal cross section, can maintain sufficient torque transmission performance, and ensure the stability and reliability of the electric push rod during work.

[0011] As preferred, the shaft sleeve is provided with a shoulder near one end of the threaded section, and the shoulder is used to abut against the inner ring of the bearing, so that the bearing can be limited at one axial end of the bearing by the shoulder, preventing the bearing from moving axially.

[0012] As preferred, the width of the shoulder is matched with the radial width of the inner ring of the bearing, so as to prevent the interference between the shoulder and the outer ring of the bearing, causing the wear of the outer ring of the bearing and the wear of the shoulder, and affecting the service life of the outer ring of the bearing and the shoulder.

[0013] As preferred, a clearance is further arranged between the gear teeth of the driving gear and the extension, and the clearance is a step structure with a diameter greater than that of the extension and less than that of the gear teeth of the driving gear.

[0014] By adding a step structure as a clearance between the gear teeth of the driving gear and the extension, the relative wear between the outer ring of the bearing and the driving gear is avoided, and the service life of the outer ring of the bearing and the driving gear is ensured.

[0015] Preferably, the end of the connecting part away from the bushing is chamfered, which facilitates the mounting of the drive gear on the outside of the connecting part.

[0016] Preferably, the end of the extension near the bushing is chamfered, which facilitates the insertion of the extension of the drive gear between the bearing inner ring and the connecting part.

[0017] Preferably, the end of the bushing away from the threaded section is chamfered, which facilitates fitting the inner ring of the bearing onto the outer side of the bushing.

[0018] This invention avoids the need to use a locking nut to axially limit the gear, significantly shortens the axial dimension of the lead screw to adapt to various installation environments and space constraints, improves the applicability and convenience of the device, and has the advantage of shortening the axial dimension and reducing the overall space occupied by the device. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of one structure of the present utility model.

[0020] Figure 2 This is a three-dimensional sectional view of the present invention.

[0021] Figure 3 for Figure 2 A magnified schematic diagram of the structure at point A in the middle.

[0022] In the figure: 11, lead screw; 111, threaded section; 112, fixing part; 113, connecting part; 12, bearing; 13, drive gear; 131, extension part; 14, bushing; 141, shoulder. Detailed Implementation

[0023] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0024] Depend on Figure 1 As shown, this embodiment discloses a gear fixing structure for an electric actuator, including a lead screw 11. The lead screw 11 includes a threaded section 111 and a mating section along the axial direction, and is formed by... Figure 2As shown, the matching section includes a fixed part 112 connected with the threaded section 111 and a connecting part 113 arranged at the end of the fixed part 112 away from the threaded section 111, the outer cylindrical surface of the fixed part 112 is sleeved with a shaft sleeve 14, the axial length of the fixed part 112 is matched with the shaft sleeve 14 and the gap between the inner wall of the shaft sleeve 14, the end of the shaft sleeve 14 away from the threaded section 111 is provided with a driving gear 13, the connecting part 113 penetrates the driving gear 13, the end of the connecting part 113 away from the shaft sleeve 14 is provided with a chamfer, the inner hole of the driving gear 13 and the cross section of the connecting part 113 are hexagonal, the extension part 131 is embedded between the inner wall of the inner ring of the bearing 12 and the outer surface of the connecting part 113, the end of the shaft sleeve 14 away from the threaded section 111 is provided with a chamfer, the shaft sleeve 14 is sleeved with the bearing 12, the end of the shaft sleeve 14 close to the threaded section 111 is provided with a stop shoulder 141, the stop shoulder 141 is used to abut against the inner ring of the bearing 12, the axial length of the bearing 12 is greater than the axial length of the shaft sleeve 14, and the width of the stop shoulder 141 is matched with the radial width of the inner ring of the bearing 12.

[0025] By Figure 3 As shown, the teeth of the driving gear 13 close to the end of the shaft sleeve 14 are provided with an extension part 131, the extension part 131 is embedded between the inner wall of the inner ring of the bearing 12 and the outer surface of the matching section, the space between the teeth of the driving gear 13 and the extension part 131 is provided with a clearance part, the clearance part is a stepped structure with a diameter greater than that of the extension part 131 and less than that of the teeth of the driving gear 13, and the end of the extension part 131 close to the shaft sleeve 14 is provided with a chamfer.

[0026] When the electric push rod works, the motor in the electric push rod starts, the motor drives the driving gear 13 to rotate through the transmission gear set, the driving gear 13 is matched between the inner ring of the bearing 12 and the shaft sleeve 14 through the extension part 131, and then the extension part 131 of the driving gear 13 drives the inner ring of the bearing 12 and the shaft sleeve 14 to rotate at the same time, when the shaft sleeve 14 rotates, because the friction of the inner surface of the shaft sleeve 14 is greater than the rolling friction between the inner ring and the outer ring of the bearing 12, the shaft sleeve 14 drives the lead screw 11 to rotate synchronously, and the lead screw 11 drives the push rod to move along the axis of the lead screw 11 through the threaded section 111.

Claims

1. A gear-fixed structure for an electric linear actuator, comprising a lead screw, the lead screw including a threaded section and a mating section along the axial direction, the mating section being used for power connection with an electric linear actuator motor, characterized in that: A bushing is fitted on the outer circular surface of the mating section, and a bearing is fitted on the bushing. The axial length of the bearing is greater than the axial length of the bushing. A drive gear is provided at the end of the bushing away from the threaded section. An extension is provided at the end of the drive gear near the bushing. The extension is embedded between the inner wall of the inner ring of the bearing and the outer surface of the mating section.

2. The gear fixing structure for an electric linear actuator according to claim 1, characterized in that: The mating section includes a fixing part connected to the threaded section and a connecting part located at one end of the fixing part away from the threaded section. The fixing part matches the axial length of the bushing and has a clearance fit with the inner wall of the bushing. The connecting part passes through the drive gear. The inner hole of the drive gear and the cross-section of the connecting part are both hexagonal. The extension is embedded between the inner wall of the bearing inner ring and the outer surface of the connecting part.

3. The gear fixing structure for an electric actuator according to claim 1 or 2, characterized in that: The bushing has a shoulder at one end near the threaded section, and the shoulder is used to abut against the inner ring of the bearing.

4. The gear fixing structure for an electric actuator according to claim 3, characterized in that: The shoulder width is adapted to the radial width of the bearing inner ring.

5. The gear fixing structure for an electric linear actuator according to claim 4, characterized in that: A clearance portion is provided between the teeth of the drive gear and the extension portion. The clearance portion is a stepped structure with a diameter larger than the diameter of the extension portion but smaller than the diameter of the teeth of the drive gear.

6. The gear fixing structure for an electric linear actuator according to claim 2, characterized in that: The end of the connecting part away from the bushing has a chamfer.

7. The gear fixing structure for an electric linear actuator according to claim 6, characterized in that: The extension has a chamfer at one end near the bushing.

8. The gear fixing structure for an electric linear actuator according to claim 7, characterized in that: The end of the bushing away from the threaded section is chamfered.

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