WO2018121725A1

WO2018121725A1 - Steering gear shaft pressing device

Info

Publication number: WO2018121725A1
Application number: PCT/CN2017/119767
Authority: WO
Inventors: 李冠佑; 李群; 熊友军
Original assignee: 深圳市优必选科技有限公司
Priority date: 2016-12-30
Filing date: 2017-12-29
Publication date: 2018-07-05
Also published as: CN106737387A; CN106737387B

Abstract

A steering gear shaft pressing device (100) is used to assemble a steering gear shaft and a speed reducer gearbox, and comprises: a base (110) comprising a positioning mechanism (112) disposed thereon and used to position the speed reducer gearbox; a guiding shaft (120) vertically arranged on the base; a top plate (130) arranged opposite to the base, and capable of being shifted horizontally along the guiding shaft; a pressing block (140) detachably fixed on the top plate, located at a side of the top plate opposite to the base, and comprising a gear shaft positioning hole (141) used to fit the steering gear shaft; and a magnetic attachment component (150) used to attract the gear shaft into the gear shaft positioning hole. When in use, the speed reducer gearbox is fixed at the positioning mechanism on the base, the magnetic attachment component attracts the steering gear shaft into the gear shaft positioning hole, and an external force is applied to press the top plate downwards, so as to install the steering gear shaft in the speed reducer gearbox, and complete assembly of the steering gear shaft and the speed reducer gearbox. The embodiment increases the transmission precision upon the assembly of the steering gear shaft and the speed reducer gearbox, and ensures relative positions of all the shafts.

Description

Rudder gear shaft pressing device

Technical field

The present invention relates to the field of steering gears, and more particularly to a steering gear shaft pressing device.

Background technique

Steering gears are generally used in applications where the angle of rotation is controlled or where high torque is provided, such as RC mode steering, pan/tilt control, and robotic power. The steering gear reducer is an important part of the steering gear.

The conventional steering gear reducer consists of multi-stage gears. As shown in Figure 1, the steering gear reducer consists of a four-stage reduction system, including motor teeth 1, primary gear 2, secondary gear 3, tertiary gear 4, and output. The tooth 5 and the support bearing 6. The motor tooth 1 is mounted on the motor shaft, and is positioned by the motor boss and the reduction gear body, and the output tooth 5 is positioned by the two support bearings 6 and the reduction gear body. The primary teeth 2, the secondary teeth 3 and the tertiary teeth 4 are all mounted in the reduction gear body 20 by the steering gear shaft 7.

A gear shaft hole 21 corresponding to the steering gear shaft 7 is disposed on the reduction gear body 20, and the first gear 2, the second gear 3 and the third gear 4 of the steering gear reducer are respectively positioned and mounted through the steering gear shaft 7 In the gear shaft hole 21 of the reduction case 20, the assembly of the steering gear shaft 7 and the reduction case 20 is realized.

There are two methods for assembling the steering gear shaft and the reduction gear box of the conventional steering gear:

The first type: under the condition that there is a gap between the gear shaft of the steering gear and the gear shaft hole of the reduction gear body, the steering gear shaft is directly placed in the casing;

Secondly, under the condition that there is no gap between the gear shaft of the steering gear and the gear shaft hole of the reduction gear box, the single shaft of the steering gear shaft is pressed into the casing by pressure.

However, for the first assembly method, since there is a gap between the gear shaft of the steering gear and the gear shaft hole of the reduction gear body, the position of the gear shaft of the steering gear is not fixed, which affects the transmission precision of the gear set; meanwhile, due to the steering gear The gear shaft is not fixed, causing the steering gear shaft to easily sway or even fall. For the second assembly method, the position of the steering gear shaft is fixed, but the position of the single gear shaft can only be guaranteed when the shaft is pressed. The distance and position tolerance between the shafts cannot be guaranteed. In particular, the steering gear shaft cannot be guaranteed. The relative positional relationship between the output teeth and the motor teeth.

Summary of the invention

Based on this, it is necessary to provide a steering gear shaft pressing device capable of improving the transmission accuracy of the steering gear shaft and the reduction gear body after assembly and ensuring the relative position between the shafts.

A steering gear shaft pressing device for assembling a steering gear shaft and a reduction gear body, wherein the steering gear shaft pressing device comprises:

a base on which the positioning mechanism for positioning the reduction box body is disposed;

a guide rod is erected on the base;

a top plate opposite to the base, the top plate being translatable along the guide rod;

a pressing block detachably fixed to the top plate and located on a side of the top plate opposite to the base, the pressing block having a gear shaft positioning hole for engaging the steering gear shaft;

And a magnetic absorbing member for absorbing the steering gear shaft into the gear shaft positioning hole.

When the above-mentioned steering gear shaft pressing device for assembling the steering gear shaft and the reduction gear body is used, the steering gear reduction gear body is fixed on the positioning mechanism of the base, and the magnetic adsorption component adsorbs the steering gear shaft into the gear shaft positioning. In the hole, after pressing the top plate by external force, the steering gear shaft can be mounted on the reduction gear body, thereby completing the assembly of the steering gear shaft and the reduction gear body, and improving the assembly of the steering gear shaft and the reduction gear body. Transmission accuracy also ensures the relative position between the axes.

In one embodiment, the magnetic adsorbing member is a magnetic absorbing nail.

In one embodiment, the gear shaft positioning hole is a stepped hole, and the magnetic adsorption nail can be engaged in the stepped hole such that an outer surface of the magnetic adsorption nail can be flush with an outer surface of the pressure block. .

In one embodiment, the number of the guiding rods is two, and the two guiding rods are symmetrically distributed on both sides of the pressing block.

In one embodiment, the outer contour of the cross section of the compact along a direction perpendicular to the guide bar is circular, and the radius of the circular decreases from the top plate to the base.

In one embodiment, the steering gear shaft pressing device further includes an elastic member sleeved on the outside of the guide rod and a stopper for preventing the top plate from coming off the guide rod, the elastic member Both ends abut against the base and the top plate.

In one of the embodiments, the stop is threadedly coupled to the top plate.

In one of the embodiments, the base has a recess for securing the resilient member and the end of the guide rod.

In one embodiment, the positioning mechanism includes a first positioning post and a second positioning post for respectively fixing a motor hole of the reduction gear body and a bearing hole of the reduction gear body.

In one embodiment, the positioning mechanism further includes a positioning boss for securing the outer contour of the reduction box.

DRAWINGS

Figure 1 is a schematic view of a steering gear reduction box;

2 is a schematic view of a reduction box body in a steering gear;

3 is a perspective view 1 of a steering gear shaft pressing device of a steering gear according to an embodiment of the present invention;

4 is a perspective view 2 of a steering gear shaft pressing device of a steering gear according to an embodiment of the present invention;

Figure 5 is a front elevational view of a gear shaft pressing device of a steering gear according to an embodiment of the present invention;

Figure 6 is a left side elevational view of the steering gear shaft pressing device of the steering gear according to the embodiment of the present invention;

7 is a perspective view of a compact and a magnetic adsorbing member according to an embodiment of the present invention;

8 is a schematic bottom view of a compact block according to an embodiment of the present invention;

9 is a schematic perspective view of a compact according to another embodiment of the present invention.

detailed description

The above described objects, features and advantages of the present invention will become more apparent from the aspects of the appended claims. Numerous specific details are set forth in the description below in order to provide a thorough understanding of the invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar modifications without departing from the spirit of the invention, and thus the invention is not limited by the specific embodiments disclosed below.

The invention provides a steering gear shaft pressing device for assembling a steering gear shaft and a reduction gear body, so as to improve the transmission precision of the steering gear shaft and the reduction gear body after assembly and ensure the relative position between the shafts.

Referring to FIG. 3 to FIG. 8 , the steering gear shaft pressing device 100 of the embodiment includes a base 110 , a guide rod 120 , a top plate 130 , a pressing block 140 , a magnetic adsorbing member 150 , and an elastic member 160 sleeved on the outside of the guiding rod 120 . And a stopper 170 for preventing the top plate 130 from coming out of the guide bar 120.

The base 110 is provided with a positioning mechanism 112 for positioning the reduction box. The positioning mechanism 112 includes a first positioning post 1121 and a second positioning post 1122 for respectively fixing the motor hole of the reduction gear body and the bearing hole of the reduction gear body, and a positioning boss 1123 for fixing the outer contour of the reduction gear box. The first positioning post 1121, the second positioning post 1122 and the positioning boss 1123 cooperate to fix the reduction gear body, which can ensure the position of the reduction gear body is accurate, and at the same time ensure the stability during assembly with the steering gear shaft.

The guide bar 120 is erected on the base 110 to support and guide the movement of the top plate 130. As shown in FIGS. 3-6, the axial direction of the guide bar 120 is perpendicular to the bottom plane of the base 110. In the present embodiment, the number of the guide bars 120 is two, and the two guide bars 120 are symmetrically distributed on both sides of the pressing block 140. The advantage of this arrangement is that the steering gear shaft and the reduction gear body can be assembled from the other side of the guide rod 120 for easy operation.

Certainly, the number of the guiding rods 120 is not limited thereto, and any other number of guiding rods 120 may be disposed, and may be specifically set according to actual needs.

As shown in FIGS. 3 to 6, the top plate 130 is disposed opposite to the base 110. The top plate 130 is used to secure the clamp 140, and the top plate 130 is translatable along the guide bar 120. Specifically, the top plate 130 has two through holes through which the guide rod 120 can pass. After the guide rod 120 passes through the through hole, the top plate 130 translates along the axial direction of the guide rod 120, and simultaneously drives the pressing block 140 toward the base. The direction of the 110 is translated.

The pressing block 140 is detachably fixed to the top plate 130 and located on a side of the top plate 130 opposite to the base 110. The pressure block 140 has a gear shaft positioning hole 141 for engaging the steering gear shaft and a screw hole 142 for fixing the screw, as shown in FIGS. 7 and 8.

The gear shaft positioning hole 141 is disposed corresponding to the gear shaft hole on the reduction gear body, that is, the number and distribution of the gear shaft positioning hole 141 and the gear shaft hole on the reduction gear body are consistent. Further, the inner diameter of the gear shaft positioning hole 141 is the same as the outer diameter of the steering gear shaft. Therefore, there is no gap between the gear shaft positioning hole 141 and the steering gear shaft, and the steering gear shaft can be prevented from being positioned in the gear shaft positioning hole 141. Shaking in the middle affects assembly accuracy.

In the embodiment, the pressing block 140 is detachably and fixedly connected to the top plate 130 by screws. Specifically, one end of the screw is fixed in the screw hole 142 through the top plate 130. In the embodiment, the fixed connection between the pressing block 140 and the top plate 130 is realized by two screws distributed on both sides of the gear shaft positioning hole 141, thereby ensuring the stability of the pressing block 140 and the top plate 130.

In the present embodiment, the outer contour of the cross section of the pressing block 140 in the direction perpendicular to the guiding rod 120 is circular, and the radius of the circular shape decreases from the top plate 130 to the base 110, as shown in FIGS. 7 and 8. The purpose of this arrangement is to be able to reduce the volume of the compact 140 while saving a portion of the material, which is advantageous in terms of cost savings. Of course, the shape of the pressing block 140 is not limited thereto, and may be other shapes. For example, the pressing block 140 may also be a cylindrical body provided with a gear shaft positioning hole.

The magnetic adsorbing member 150 is for absorbing the steering gear shaft into the gear shaft positioning hole 141. The magnetic adsorbing member 150 of the present embodiment is a magnetic absorbing nail as shown in FIG. And the magnetic absorbing nails are in one-to-one correspondence with the gear shaft positioning holes 141. Of course, the magnetic adsorbing member 150 can also be other types of components having a certain magnetic property.

In addition, the gear shaft positioning hole 141 of the present embodiment is a stepped hole, and the magnetic absorbing nail can be engaged in the stepped hole so that the outer surface of the magnetic absorbing nail can be flush with the outer surface of the pressure block 140. After the magnetic absorbing nail is engaged in the stepped hole and the pressing block 140 is fixed on the top plate 130, the upper surface of the pressing block 140 can be in close contact with the lower surface of the top plate 130, thereby better fixing the pressing block 140 and preventing The pressing block 140 is shaken to affect the assembly accuracy of the subsequent gear shaft positioning holes 141. Meanwhile, in order to facilitate the mounting, the depth of the gear shaft positioning hole 141 is deeper than the length of the magnetic attraction nail.

The magnetic adsorption nail is magnetic, and after assembly, it can adsorb the iron gear shaft of the steering gear, but the suction force of the magnetic adsorption nail is not strong, and the iron steering gear shaft will not be sucked out after the pressing.

In addition, it should be noted that the gear shaft positioning hole 141 on the pressure block 140 in the present embodiment is a stepped hole, but it is not limited thereto.

For example, referring to FIG. 9, the gear shaft positioning hole 241 of the press block 240 for engaging the steering gear shaft of the other embodiment is a through hole. At this time, the nail cap portion of the magnetic attracting nail is located outside the upper surface of the pressing block 240, and the other end portion of the magnetic attracting nail can penetrate into the gear shaft positioning hole 241 for adsorbing the steering gear shaft.

Both ends of the elastic member 160 abut against the base 110 and the top plate 130, respectively. The elastic member 160 of the present embodiment is a spring. Of course, the elastic member 160 can also be other components that can function elastically. On one hand, the elastic member 160 can support the shaft during the process of pressing the shaft, so that the pressure block 140 slowly presses the gear shaft to avoid the speed of the pressure being too fast and damaging the steering gear shaft; on the other hand, when the steering gear shaft is pressed Thereafter, the elastic force of the elastic member 160 returns the top plate 130 to which the pressing block 140 is fixed to the stopper 170 for the next use.

The stopper 170 of the present embodiment is a nut, and the nut is screwed to the top plate. Of course, the stop member 170 can also be other components that can function as a stop.

In addition, the base 110 of the present embodiment has a recess 114 for fixing the end of the elastic member 160 and the guide rod 120. As shown in FIG. 3, the recess 114 has a circular cross section along the radial direction of the guide rod 120. The size is the same as the size of the spring, so that the spring just snaps into the groove 114, which prevents the spring from shaking and affects the assembly accuracy. Of course, the shape of the groove 114 along the radial cross section of the guide bar 120 varies depending on the shape of the elastic member 160 as long as the elastic member 160 can be fixed.

When the above-mentioned steering gear shaft pressing device for assembling the steering gear shaft and the reduction gear body is used, the steering gear reduction gear body is fixed on the positioning mechanism of the base, and the magnetic adsorption component is attached to the gear shaft of the assembly steering gear shaft. After positioning the hole, and then pressing the top plate by external force, the steering gear shaft can be mounted on the reduction gear body, thereby completing the assembly of the steering gear shaft and the reduction gear body, and improving the assembly of the steering gear shaft and the reduction gear body. The transmission accuracy also guarantees the relative position between the axes.

The technical features of the above-described embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, as long as there is no contradiction between the combinations of these technical features, All should be considered as the scope of this manual.

The above-described embodiments are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but is not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. Therefore, the scope of the invention should be determined by the appended claims.

Claims

A steering gear shaft pressing device for assembling a steering gear shaft and a reduction gear body, wherein the steering gear shaft pressing device comprises:

a base on which the positioning mechanism for positioning the reduction box body is disposed;

a guide rod is erected on the base;

a top plate opposite to the base, the top plate being translatable along the guide rod;

a pressing block detachably fixed to the top plate and located on a side of the top plate opposite to the base, the pressing block having a gear shaft positioning hole for engaging the steering gear shaft;

And a magnetic absorbing member for absorbing the steering gear shaft into the gear shaft positioning hole.
A steering gear shaft pressing device according to claim 1, wherein said magnetic absorbing member is a magnetic absorbing nail.
The steering gear shaft pressing device according to claim 2, wherein the gear shaft positioning hole is a stepped hole, and the magnetic absorbing nail is engageable in the stepped hole to make the magnetic absorbing nail The outer surface can be flush with the outer surface of the compact.
The steering gear shaft pressing device according to claim 1, wherein the number of the guiding rods is two, and the two guiding rods are symmetrically distributed on both sides of the pressing block.
The steering gear shaft pressing device according to claim 1, wherein an outer contour line of the cross section of the pressing block in a direction perpendicular to the guiding rod is circular, and the radius of the circular shape is The direction from the top plate to the base is decreasing.
A steering gear shaft pressing device according to claim 1, wherein said steering gear shaft pressing device further comprises an elastic member sleeved outside said guide rod and for preventing said top plate from coming out of said guide A stopper of the rod, the two ends of the elastic member respectively abut against the base and the top plate.
A steering gear shaft pressing device according to claim 6, wherein said stopper is screwed to said top plate.
A steering gear shaft pressing device according to claim 1, wherein said base has a recess for fixing said elastic member and an end portion of said guide rod.
A steering gear shaft pressing device according to claim 1, wherein said positioning mechanism includes a first positioning post for respectively fixing a motor hole of said reduction gear body and a bearing hole of said reduction gear body; Second positioning post.
A steering gear shaft pressing device according to claim 1, wherein said positioning mechanism further comprises a positioning boss for fixing an outer contour of said reduction gear box.