Special combination device for positioning and pressing spherical hinge

Abstract

The invention relates to a special combined device for positioning and pressing a spherical hinge. The special combined device comprises a base, a positioning and pressing structure and a follow-up pressing structure, according to the positioning and pressing structure, pre-pressure designed for a first pressure spring is utilized, a ball seat is pressed manually, and positioning and pressing of the ball seat are achieved through cooperation of an arc surface and a bottom plane. According to the follow-up pressing structure, follow-up of a ball gland is achieved through rotation of a guide sleeve, follow-up pressing is achieved through preset pressure of a second pressure spring, and locking or changing of follow-up pressing force during grinding is achieved through a gear and rack structure. The base changes the position state of the spherical hinge through a 90-degree V-shaped groove structure, so that the axis of a ball journal rod of the spherical hinge is in the vertical direction when the ball journal of the spherical hinge is in a three-dimensional space. The grinding operation is facilitated, the grinding quality is guaranteed, and the working efficiency of grinding is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of mechanical manufacturing, and in particular relates to a combined special device for positioning and pressing a ball hinge. Background Art

[0002] As a universal mechanism for realizing spherical motion, precision ball hinges are widely used in parallel mechanism buffer bases and robots, and their number is large. Precision ball hinges consist of three parts: ball seat 1, ball journal 2, and ball pressure cover 3. Figure 1 As shown, in the combined grinding process of the ball hinge, the related parts of the ball hinge need to be fixed on the working platform of the grinder. According to the working principle of the ball hinge, the ball seat needs to be positioned and pressed, and the ball pressure cover needs to be pressed dynamically during the combined grinding. During the grinding process, the ball journal is connected to the main shaft of the grinder and rotates with the rotation of the main shaft of the grinder, so that the outer spherical surface of the ball journal and the inner spherical surface composed of the ball seat and the ball pressure cover can move relative to each other, generate friction, and the ball journal is coated with a numbered diamond abrasive to achieve friction cutting processing, so that the inner spherical surface of the ball hinge can be mutually ground until the technical requirements of the design are met. In the actual grinding process, it is necessary to design a combined special device for positioning and pressing the ball hinge to position and press the ball seat of the ball hinge and to achieve follow-up pressing of the ball pressure cover. Automatic grinding of the spherical surface can be achieved to meet technical requirements, improve production efficiency, improve operating process methods, improve the working environment, and reduce the labor intensity of the master. Summary of the invention

[0003] Aiming at the deficiencies of the prior art, the present invention provides a combined special device for positioning and pressing a ball hinge.

[0004] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0005] A combined special device for positioning and pressing a ball hinge, comprising a base, a positioning and pressing structure and a follow-up pressing structure;

[0006] The positioning and clamping structure comprises a positioning support and a lateral elastic clamping assembly; a ball seat mounting hole is arranged at the upper end of the positioning support, and the bottom surface of the ball seat mounting hole constitutes a supporting surface; a grinding liquid discharge groove is arranged on the positioning support at the lower part of the ball seat mounting hole; the lateral elastic clamping assembly is installed on the positioning support outside one side of the ball seat mounting hole in a direction parallel to the supporting surface, and is clamped on the outer side surface of the ball seat placed in the ball seat mounting hole by a clamping head to realize the positioning and clamping of the ball seat;

[0007] The follow-up clamping structure includes an elastic follow-up guide structure and an elastic energy storage holding and adjustment mechanism acting on the elastic follow-up guide structure; the elastic follow-up guide structure includes an upper support seat, a second compression spring, a lower support seat, a support shaft, a guide sleeve and a positioning pin; the lower end of the support shaft and the upper end of the positioning support of the positioning clamping structure are located on the other side of the ball seat mounting hole and are vertically fixedly connected, the upper support seat and the lower support seat adopt a cylindrical structure, and the upper and lower support seats are movably plug-in matched, and the second compression spring is pressed into the upper support seat and the lower support seat, and the three form an elastic energy storage group Parts; the elastic energy storage component is fitted with the support shaft; the guide sleeve is rotatably mounted on the support shaft and is located below the elastic energy storage component, two pin holes are arranged on the guide sleeve on the outside of the support shaft, a positioning pin is vertically installed in each of the two pin holes, and the two positioning pins are used to be inserted and matched with two set pin holes on the ball pressure cover to achieve the positioning of the ball pressure cover; the elastic energy storage holding and adjustment mechanism is integrally installed on the upper end surface of the support shaft, and forms a pressing contact with the upper end of the upper bracket through the end actuator whose position can be adjusted up and down;

[0008] The base is a rectangular structure with a 90° V-shaped groove in the middle and upper part, which is composed of an inclined plane A and an inclined plane B. Rectangular through holes are formed on both sides of the bottom line of the 90° V-shaped groove for discharging grinding liquid; the inclined plane A is in close contact with the left side surface of the positioning support, and the inclined plane B is in close contact with the bottom surface of the positioning support. Threaded holes A and threaded holes B are vertically arranged on the side walls on both sides of the inclined plane B. By installing set screws, the positioning clamping structure and the follow-up clamping structure are fixed to the base in a manner that the ball journal rod of the ball hinge is vertically upward.

[0009] Moreover, the lateral elastic pressing assembly includes a pressing piece, a locking support, a first compression spring and a handle; a pressing piece accommodating groove is provided on one side of the ball seat mounting hole on the positioning support seat, and a guide through hole is provided on the outer side of the pressing piece accommodating groove; the pressing piece adopts a rod-shaped pressing piece with a pressing head provided at the inner end; the locking support adopts a set support with a flange provided at one end, and a spring limiting surface is provided at the end away from the flange in the locking support; the locking support is fixedly installed on the outer side of the positioning support through the flange, and the inner hole of the locking support is connected to the positioning support The guide through hole on the seat is coaxially arranged; the clamping piece is sequentially installed in the guide through hole on the positioning support and the inner hole on the locking support from the inside to the outside with the clamping head facing inward, and extends out from the outer end of the locking support, and a spring limiting surface is arranged on the end of the rod body of the clamping piece close to the clamping head; the first compression spring is mounted on the rod body of the clamping piece, and the two ends of the first compression spring are respectively pressed on the spring limiting surface on the clamping piece and the spring limiting surface in the inner hole of the locking support; the handle is arranged on the outer side of the locking support and is fixedly connected to the outer end of the rod body of the locking piece.

[0010] Moreover, two positioning protrusions at an angle of 180° are arranged on the end face of one side of the handle close to the locking support, and two groups of positioning grooves are arranged on the outer end of the locking support. The two groups of positioning grooves are arranged at an angle of 90°, and each group of positioning grooves is composed of two grooves arranged at an angle of 180°, one group of positioning grooves is shallow grooves, and the other group of positioning grooves is deep grooves; when the two positioning protrusions are in cooperation with the group of deep grooves, the clamping piece is in pressing contact with the side surface of the ball seat through the clamping head; when the two positioning protrusions are in cooperation with the group of shallow grooves, the clamping head of the clamping piece is out of contact with the side surface of the ball seat.

[0011] Moreover, the elastic energy storage holding and adjustment mechanism includes an operating rod, a rack, a gear, a gear seat, a connecting seat and a guide member; the guide member constitutes the end actuator, the guide member is pressed on the top of the upper support seat, and adopts a disc-shaped structure. Two through holes are provided on the guide member for the upper end of the support shaft to extend out on both sides of the yield groove provided thereon; the connecting seat is provided above the guide member, and the lower part of the connecting seat is clamped and fixedly connected with the upper end of the support shaft; a rack guide groove is provided on the connecting seat along the up and down directions, the rack is provided in the rack guide groove, and the lower end of the rack is pressed and contacted with the upper end of the guide member; the gear seat is fixed on the connecting seat, and the gear is fixed on the gear shaft. The two ends of the gear shaft are rotatably supported on the gear seat through ball bearings and bearing seats, so that the gear and the rack are meshed; an operating rod is fixedly connected to one end of the gear shaft, and an external braking device is provided at the other end of the gear shaft.

[0012] The advantages and positive effects of the present invention are:

[0013] The present invention can realize the pressing and fixing of the ball seat in the ball hinge through the positioning and clamping structure, and can realize the ball pressure cover in the ball hinge to be matched with the top of the ball seat in a manner that it can be swingably adjusted in the horizontal direction and floatable in the up and down directions through the follow-up clamping structure. By matching the positioning and clamping structure and the follow-up clamping structure with the V-groove on the base, the ball shaft neck rod body of the ball hinge can be set vertically upward during the grinding operation, which facilitates the grinding operation, ensures the grinding quality, and improves the grinding work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a precision ball hinge involved in the present invention;

[0015] Figure 2 It is a schematic diagram of the appearance of the combined special device for positioning and pressing a ball hinge of the present invention;

[0016] Figure 3 It is an overall cross-sectional view of the combined special device for positioning and pressing a ball hinge of the present invention;

[0017] Figure 4It is a schematic diagram of the overall appearance of the positioning and clamping structure of the present invention (in the state of installing the ball seat);

[0018] Figure 5 It is an overall cross-sectional view of the positioning and clamping structure of the present invention (in a ball seat installation state);

[0019] Figure 6 is a cross-sectional view of the ball seat of the present invention supported on a positioning support;

[0020] Figure 7 It is a schematic diagram of the cooperation between the handle and the outer end of the locking support in the positioning and pressing structure of the present invention;

[0021] Figure 8 It is an overall cross-sectional view of the follow-up pressing structure of the present invention;

[0022] Fig. 9 It is a side view (including a partial cross-sectional view) of the follower clamping structure of the present invention;

[0023] Fig.10 is a cross-sectional view of the base of the present invention;

[0024] Fig.11 It is a three-dimensional diagram of the base of the present invention. DETAILED DESCRIPTION

[0025] The structure of the present invention is further described below with reference to the accompanying drawings and by way of examples. It should be noted that the present examples are descriptive rather than restrictive.

[0026] A special combined device for positioning and tightening ball hinges, see Figure 1-Figure 11 The invention point is: it includes a base 6, a positioning and clamping structure 4 and a follow-up clamping structure 5.

[0027] The positioning and clamping structure utilizes the pre-pressure designed for the spring to manually clamp the ball seat, and the positioning and clamping of the ball seat is achieved by the cooperation of the arc surface and the bottom plane. The follow-up clamping structure realizes the follow-up of the ball pressure cover by the rotation of the guide sleeve, realizes the follow-up clamping by the preset pressure of the spring, and realizes the locking or change of the follow-up clamping force during grinding by the gear rack structure. The base changes the position state of the ball hinge through the 90° V-groove structure, so that the ball shaft neck of the ball hinge is in a vertical direction with the axis of the ball shaft neck ball rod in the three-dimensional space.

[0028] like Figure 4-Figure 7As shown, the positioning and clamping structure is mainly composed of a positioning support 4.1, a clamping member 4.2, a locking support 4.3, a first compression spring 4.5 and a handle 4.4, wherein the clamping member, the locking support, the first compression spring and the handle constitute a lateral elastic clamping assembly. The positioning support is the main body of the positioning and clamping structure, and a ball seat mounting hole is provided at the upper end of the positioning support seat, and the bottom surface of the ball seat mounting hole constitutes a supporting surface 4.1.1, which contacts the bottom surface of the ball seat to support the ball seat, and the ball seat mounting hole contacts the outer circle of the ball seat. A grinding liquid discharge groove is provided on the positioning support at the lower part of the ball seat mounting hole, which is used for discharging the grinding liquid during grinding, and the grinding liquid discharge groove adopts a rectangular slot. A clamping member receiving groove is provided on one side of the ball seat mounting hole on the positioning support seat, and a guide through hole is provided on the outer side of the clamping member receiving groove. The clamping member adopts a rod-shaped clamping member with a clamping head provided at the inner end. The locking support adopts a sleeve support with a flange at one end, and a spring limiting surface is provided at the end of the locking support away from the flange. The locking support is fixedly installed on the outer side of the positioning support through the flange, and the inner hole of the locking support is coaxially arranged with the guide through hole on the positioning support. The pressing piece is sequentially installed in the guide through hole on the positioning support and the inner hole on the locking support from the inside to the outside with the pressing head facing inward, and extends from the outer end of the locking support. A spring limiting surface is provided on the rod body of the pressing piece near the pressing head. The first compression spring is sleeved on the rod body of the pressing piece, and the two ends of the first compression spring are respectively pressed on the spring limiting surface on the compression piece and the spring limiting surface in the inner hole of the locking support. The handle is arranged on the outer side of the locking support, and is fixedly connected to the outer end of the rod of the locking piece by means of threaded connection or the like. Furthermore, two positioning protrusions 4.4.1 are arranged at 180° on the end surface of one side of the handle close to the locking support, and two groups of positioning grooves are arranged on the outer end of the locking support. The two groups of positioning grooves are arranged at an angle of 90°, and each group of positioning grooves is composed of two grooves arranged at 180°, one group of positioning grooves is shallow grooves 4.3.2, and the other group of positioning grooves is deep grooves 4.3.1.

[0029] During operation, the clamping piece presses the side surface of the ball seat through the clamping head, so that the round side surface of the ball seat is close to the mounting hole surface of the ball seat, and the ball seat is clamped and fixed. At this time, the two positioning protrusions are embedded in a set of deep grooves. When the ground ball seat needs to be removed, the handle is pulled to the right out of the deep groove, and then rotated 90° to embed the two positioning protrusions into the shallow grooves. The spring is compressed to separate the clamping head of the clamping piece from the side surface of the ball seat, which can facilitate the removal of the ball seat; when the ball seat to be ground is put in again, the handle is pulled to the right and turned back to the original 0° position, the elastic force of the first compression spring is released, and the clamping piece moves inward to clamp the ball seat through the clamping head.

[0030] like Figure 8 , Fig. 9As shown, the follow-up clamping structure mainly includes an operating rod 5.1, a rack 5.2, a gear 5.3, a bearing seat 5.13, a ball bearing 5.15, a gear seat 5.4, a connecting seat 5.5, a guide member 5.6, an upper support seat 5.7, a second compression spring 5.8, a lower support seat 5.9, a support shaft 5.10, a guide sleeve 5.11 and a positioning pin 5.12.

[0031] Among them, the upper support seat, the second compression spring, the lower support seat, the support shaft, the guide sleeve and the positioning pin constitute an elastic follow-up guide structure. The lower end of the support shaft is vertically fixedly connected to the upper end of the positioning support of the positioning and clamping structure on the other side of the ball seat mounting hole, and a clearance slot is provided in the middle of the upper end of the support shaft. The upper support seat and the lower support seat adopt a cylindrical structure, and the upper and lower support seats are movably plug-in matched, which plays a protective role for the second compression spring. The second compression spring is pressed into the upper support seat and the lower support seat. The three constitute an elastic energy storage component, which is designed to be in a spring pre-compression state. The elastic energy storage component is fitted with the support shaft. The guide sleeve is rotatably mounted on the support shaft and is located below the elastic energy storage component. Two pin holes are provided on the guide sleeve on the outside of the support shaft, and a positioning pin is vertically installed in each of the two pin holes. The two positioning pins are used to be plug-in matched with the two set pin holes on the ball pressure cover to achieve the positioning of the ball pressure cover.

[0032] The above-mentioned operating rod, rack, gear, bearing seat, ball bearing, gear seat, connecting seat and guide member constitute a gear rack assembly, which is used to realize the maintenance and adjustment of the elastic energy storage of the elastic follower guide structure, also known as the elastic energy storage maintenance and adjustment mechanism. The guide member is pressed on the top of the upper support seat, and adopts a disc-shaped structure. Two through holes are provided on the guide member for the upper end of the support shaft to extend out from the two sides of the groove. The connecting seat is arranged above the guide member, and the lower part of the connecting seat forms a clamping fixed connection with the upper end of the support shaft. A rack guide groove is provided on the connecting seat along the up and down directions, and the rack is arranged in the rack guide groove, and the lower end of the rack is pressed and contacted with the upper end of the guide member. The gear seat is fixed on the connecting seat, and the gear is fixed on the gear shaft 5.14. The two ends of the gear shaft are rotatably supported on the gear seat through ball bearings and bearing seats, so that the gear and the rack are meshed. An operating lever is fixedly connected to one end of the gear shaft to facilitate the rotation of the gear. An external braking device is provided at the other end of the gear shaft, such as an electromagnetic brake or a mechanical brake installed on the gear shaft. When self-locking is required, the braking device works to limit the rotation of the gear, thereby keeping the rack still.

[0033] The above-mentioned follow-up clamping structure positions the ball pressure cover through two positioning pins. During the grinding process, as the grinding amount is removed, the position of the ball pressure cover is adjusted by the rotation of the guide sleeve around the support shaft and the downward movement (slight amount) of the guide sleeve. The follow-up clamping structure changes the elastic force of the second compression spring by changing the stroke of the rack. Specifically, the gear is rotated by rotating the operating lever, and the rack moves up and down along the guide groove of the gear seat through the meshing of the gear teeth. The stroke changes, and the guide member plays the function of compressing or releasing the elastic force of the second compression spring.

[0034] like Fig.10 , Fig.11 As shown, the base structure is a rectangular parallelepiped structure, with a 90° V-shaped groove in the middle and the upper part, which is composed of a bevel A6.1 and a bevel B6.2. Rectangular through holes are opened on both sides of the bottom line of the 90° V-shaped groove for discharging the grinding liquid. Bevel A is close to the left side of the positioning support, bevel B is close to the bottom surface of the positioning support, and threaded holes A6.3 and threaded holes B6.4 are vertically arranged on the side walls on both sides of bevel B. Threaded holes A and B are used to position and press the positioning support components. Threaded holes A or B are used according to actual work needs.

[0035] The method for using the combined special device for positioning and pressing a ball hinge of the present invention:

[0036] First, assemble and debug the ball hinge positioning and clamping combination special device. During the grinding process, install the various parts of the ball hinge to achieve the function of the designed combination special device. The specific usage method is as follows:

[0037] 1. Turn the operating lever downward, with the rack facing upward, and turn the guide sleeve 90° counterclockwise or clockwise to ensure that the positioning support has no obstruction in the positioning position, which is convenient for subsequent process operations.

[0038] 2. Pull the handle to the right and turn it 90°. The handle drives the clamping piece to move to the right. The positioning protrusion on the handle is inserted into the shallow groove on the locking support to achieve the limiting of the clamping piece. Put the ball seat into the ball seat mounting hole of the positioning support, pull the handle to the right and turn it back to the original 0° position. The elastic force of the first compression spring is released, and the clamping piece presses the ball seat.

[0039] 3. Install the ball journal and ball pressure cover, turn the guide sleeve back to the top of the ball pressure cover, insert the locating pin into the pin hole of the ball pressure cover, operate the operating lever upward, the rack presses the guide part downward, and the guide part compresses the second compression spring downward to achieve the follow-up clamping force of the ball pressure cover, connect the shaft of the ball journal to the main shaft of the grinder, start the grinder, and grind the ball joint.

[0040] Although the embodiments and drawings of the present invention are disclosed for illustrative purposes, those skilled in the art will appreciate that various substitutions, changes and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. A combined special device for positioning and pressing a ball hinge, characterized in that: It includes a base, a positioning and clamping structure, and a follow-up clamping structure; The positioning and clamping structure comprises a positioning support and a lateral elastic clamping assembly; a ball seat mounting hole is arranged at the upper end of the positioning support, and the bottom surface of the ball seat mounting hole constitutes a supporting surface; a grinding liquid discharge groove is arranged on the positioning support at the lower part of the ball seat mounting hole; the lateral elastic clamping assembly is installed on the positioning support outside one side of the ball seat mounting hole in a direction parallel to the supporting surface, and is clamped on the outer side surface of the ball seat placed in the ball seat mounting hole by a clamping head to realize the positioning and clamping of the ball seat; The follow-up clamping structure includes an elastic follow-up guide structure and an elastic energy storage holding and adjustment mechanism acting on the elastic follow-up guide structure; the elastic follow-up guide structure includes an upper support seat, a second compression spring, a lower support seat, a support shaft, a guide sleeve and a positioning pin; the lower end of the support shaft and the upper end of the positioning support of the positioning clamping structure are located on the other side of the ball seat mounting hole and are vertically fixedly connected, the upper support seat and the lower support seat adopt a cylindrical structure, and the upper and lower support seats are movably plug-in matched, and the second compression spring is pressed into the upper support seat and the lower support seat, and the three form an elastic energy storage group Parts; the elastic energy storage component is fitted with the support shaft; the guide sleeve is rotatably mounted on the support shaft and is located below the elastic energy storage component, two pin holes are arranged on the guide sleeve on the outside of the support shaft, a positioning pin is vertically installed in each of the two pin holes, and the two positioning pins are used to be inserted and matched with two set pin holes on the ball pressure cover to achieve the positioning of the ball pressure cover; the elastic energy storage holding and adjustment mechanism is integrally installed on the upper end surface of the support shaft, and forms a pressing contact with the upper end of the upper bracket through the end actuator whose position can be adjusted up and down; The base is a rectangular structure with a 90° V-shaped groove in the middle and upper part, which is composed of an inclined plane A and an inclined plane B. Rectangular through holes are formed on both sides of the bottom line of the 90° V-shaped groove for discharging grinding liquid; the inclined plane A is in close contact with the left side surface of the positioning support, and the inclined plane B is in close contact with the bottom surface of the positioning support. Threaded holes A and threaded holes B are vertically arranged on the side walls on both sides of the inclined plane B. By installing set screws, the positioning clamping structure and the follow-up clamping structure are fixed to the base in a manner that the ball journal rod of the ball hinge is vertically upward.

2. The combined special device for positioning and pressing a ball hinge according to claim 1, characterized in that: The lateral elastic clamping assembly includes a clamping piece, a locking support, a first compression spring and a handle; a clamping piece receiving groove is provided on one side of the ball seat mounting hole on the positioning support seat, and a guide through hole is provided on the outside of the clamping piece receiving groove; the clamping piece adopts a rod-shaped clamping piece with a clamping head at the inner end; the locking support adopts a set support with a flange at one end, and a spring limiting surface is provided at the end of the locking support away from the flange; the locking support is fixedly installed on the outer side of the positioning support through the flange, and the inner hole of the locking support is connected to the positioning support The guide through hole on it is coaxially arranged; the clamping piece is sequentially installed in the guide through hole on the positioning support and the inner hole on the locking support from the inside to the outside with the clamping head facing inward, and extends out from the outer end of the locking support, and a spring limiting surface is arranged on the rod body of the clamping piece at one end close to the clamping head; the first compression spring is mounted on the rod body of the clamping piece, and the two ends of the first compression spring are respectively pressed on the spring limiting surface on the clamping piece and the spring limiting surface in the inner hole of the locking support; the handle is arranged on the outer side of the locking support and is fixedly connected to the outer end of the rod body of the locking piece.

3. The combined special device for positioning and pressing a ball hinge according to claim 2, characterized in that: Two positioning protrusions at an angle of 180° are arranged on the end face of one side of the handle close to the locking support, and two groups of positioning grooves are arranged on the outer end of the locking support. The two groups of positioning grooves are arranged at an angle of 90°, and each group of positioning grooves is composed of two grooves arranged at an angle of 180°, one group of positioning grooves is shallow grooves, and the other group of positioning grooves is deep grooves; when the two positioning protrusions are in cooperation with the group of deep grooves, the clamping piece is in pressing contact with the side surface of the ball seat through the clamping head; when the two positioning protrusions are in cooperation with the group of shallow grooves, the clamping head of the clamping piece is out of contact with the side surface of the ball seat.

4. The combined special device for positioning and pressing a ball hinge according to claim 1, characterized in that: The elastic energy storage holding and adjustment mechanism includes an operating rod, a rack, a gear, a gear seat, a connecting seat and a guide member; the guide member constitutes the end actuator, the guide member is pressed on the top of the upper support seat, and adopts a disc-shaped structure. Two through holes are provided on the guide member for the upper end of the support shaft to extend out from the two sides of the yield groove provided thereon; the connecting seat is provided above the guide member, and the lower part of the connecting seat is clamped and fixedly connected with the upper end of the support shaft; a rack guide groove is provided on the connecting seat along the up and down directions, the rack is provided in the rack guide groove, and the lower end of the rack is pressed and contacted with the upper end of the guide member; the gear seat is fixed on the connecting seat, and the gear is fixed on the gear shaft. The two ends of the gear shaft are rotatably supported on the gear seat through ball bearings and bearing seats, so that the gear and the rack are meshed; an operating rod is fixedly connected to one end of the gear shaft, and an external braking device is provided at the other end of the gear shaft.

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