An assembling tool for a field-free starter stator

Abstract

An auxiliary pole starter subassembly tool belongs to the technical field of automobile starter, overcomes the problem that the existing technology cannot meet the need of firmly expanding and fixing the magnetic steel in the inner wall of the stator shell through the downward pressure of the expansion block, and has low installation efficiency, low assembly precision and easy falling of the magnetic steel, characterized in that the upper surface of the hook seat is evenly distributed with hook grooves, each hook groove is installed with an L-shaped hook, the inner cone formed by 4-6 L-shaped hooks is in sliding connection with the side surface of the assembly expansion block, the preloaded bushing is sleeved on the upper end of the assembly expansion block, and the magnetic steel positioning rod is installed on the cylinder push plate, the compact structure is stable and reliable, the downward pressure provided by the assembly expansion block and the outward pulling force provided by the L-shaped hook meet the need of the expansion force for firmly expanding and fixing the magnetic steel in the inner wall of the stator shell, the falling of the magnetic steel is fundamentally prevented, the installation efficiency of the magnetic steel and the elastic clamping plate is improved, and the assembly precision is high.

Description

Technical Field

[0001] This invention belongs to the field of automotive starter technology, and specifically relates to an assembly fixture for a starter stator without auxiliary poles. Background Technology

[0002] In existing technologies, the stator of a welded automotive starter includes a stator housing and an auxiliary pole and magnet disposed within the housing. The magnet is expanded and connected to the auxiliary pole inside the housing via a clamping plate. The problem is that the auxiliary pole needs to be pre-welded to the housing, and then the magnet is expanded and connected to the auxiliary pole using the clamping plate. This increases the material used for the auxiliary pole and also poses a risk of weld detachment. To address this issue, existing technologies have employed starter stators without auxiliary poles, thus eliminating the auxiliary pole. However, in these existing stator structures without auxiliary poles, the stator magnet and the inner wall of the housing are glued together. Because the stator magnet vibrates under long-term electromagnetic force, the adhesion is not strong and easily detaches, leading to the stator malfunctioning.

[0003] The invention disclosed in application number CN201810831959.8 is a method for assembling magnets in a starter stator assembly. This invention utilizes an assembly mechanism to position the magnets (i.e., magnets) to the stator housing. A pressure mechanism provides pressure during installation. The assembly mechanism includes a base, an expansion column, a positioning rod, and a pressure rod. The expansion column is circumferentially bound by an elastic element. A guide post is mounted on the base. The pressure rod can slide up and down along the guide post. The bottom end of the pressure rod is a conical head. The upper inner surface of the expansion block is an inclined surface that mates with the conical head. When the pressure rod is pressed down, the force applied by the conical head causes the expansion block to expand outward. The cross-sectional shape of the positioning rod is the same as the gap shape between two adjacent magnets in the stator assembly, and it is used to position the magnets. By reading the instruction manual, it can be seen that this invention has the following problems: First, in the specific use of this invention, step one involves applying adhesive to the back of the magnetic tile; therefore, this invention has the defect that the adhesive loses its stickiness and the magnet easily falls off, thus affecting the quality of the product; Second, the expansion column of this invention is composed of 2 to 6 expansion blocks circumferentially bundled and assembled by elastic elements. When the expansion blocks reach the set position, they press the magnetic tile tightly onto the stator housing. The magnetic tile is coated with adhesive to make the two adhere, so in step five, the magnetic tile must be kept in a compressed state for several seconds, and then the piston rod returns to its original position, under the elastic force of the elastic element. The expansion block pushes the conical head upward to return to its initial position. The elastic element described in this invention can be a rubber band, or a spring can be used if a larger rebound force is required. As can be seen from this description, this invention has the problem of insufficient rebound force of the elastic element during use. Moreover, the elasticity of the elastic element will decrease with use, thus affecting the rebound of the expansion block. The aforementioned problems of keeping the magnetic tile in a compressed state for several seconds and the decrease in elasticity of the elastic element with use will affect the efficiency of the expansion block pushing the conical head upward to return to its initial position, thereby affecting production efficiency. Third, this invention simply applies downward force directly through the piston cylinder of the cylinder body, pressing the pressure rod from the top, causing its conical head to move downward and the expansion block to expand outward against the elastic force of the elastic element; and simply presses the magnetic tile onto the stator housing through the outer wall of the expansion block; there is a problem that the expansion block shakes during the pressing process, thus affecting the product quality. To avoid the impact on the product when applying force on one side, this invention provides sliding inclined surfaces at both the upper and lower ends of the expansion block, which can provide external force for the expansion block to expand at both ends, so that both ends can expand simultaneously. Alternatively, slide rails are provided circumferentially at equal intervals on the inclined surface outside the central boss, and slide tracks symmetrical about its cross section are provided on the expansion block, so that the slide tracks and slide rails cooperate to further limit the expansion block and prevent it from shaking during the pressing process.Even so, this invention simply applies downward force directly through the piston cylinder of the cylinder body, pressing the pressure rod from the top, causing the sliding inclined surfaces at the upper and lower ends of the expansion block to slide relative to the conical head at the bottom of the pressure rod and the frustum-shaped inclined surface at the top of the central boss, providing external force for the expansion block to expand at the upper and lower ends. The elastic element rubber band or spring mentioned in this invention only provides the expansion block with the rebound force to return to the initial position. Therefore, the force of this invention, which only uses the outer wall of the expansion block to press the magnetic tile onto the stator shell, is far from sufficient to firmly press the magnetic tile onto the stator shell. Therefore, it is necessary to apply adhesive to the back of the magnetic tile. When the expansion block reaches the set position and presses the magnetic tile onto the stator shell to make the two adhere, the magnetic tile must be kept in a pressed state for several seconds.

[0004] Utility model application CN201921827104.4 discloses "an adhesive fixing clip for automotive starter stator magnets." However, this utility model does not fundamentally solve the problem of magnets easily detaching. In the technical solution adopted by this utility model, the magnets are also glued to the inner wall of the housing. Moreover, the adhesive fixing clips used to fix adjacent magnets are also glued to the inner wall of the housing. If the adhesive loses its adhesiveness due to factors such as the cleanliness of the stator housing surface and the working environment temperature, either the magnet or the adhesive fixing clip will detach, causing the magnet to fall off and rendering the automotive starter stator unusable.

[0005] Utility model application CN201921827002.2 discloses a "stator magnet punching and fixing clip for an automobile starter". Compared with CN201921827104.4, this utility model has two problems. First, the magnet in this utility model is also glued to the inner wall of the housing. Second, the punching and fixing clip provided by this utility model uses pressure plates to press on the upper end faces of two adjacent magnets to play an axial limiting role; and uses clips to press on the side end faces and inner walls of two adjacent magnets to play a circumferential limiting role and a radial limiting role. As can be seen from the attached drawings of the specification, the hook-shaped clamping part of the punching and fixing clip presses on the inner wall of two adjacent magnets and protrudes around the inner wall of the magnet, thus occupying the space of the rotor, resulting in a larger gap between the rotor and the magnet, thereby affecting the starting performance of the starter.

[0006] Utility model application No. 202123241926.4 discloses a "fixing device for a stator magnet of an automobile starter". This utility model includes a fixing plate for connecting to the inner wall of a housing, and two pressure plates rotatably disposed at the upper and lower ends of the fixing plate. Each pressure plate includes a body and a first elastic pressure strip and a second elastic pressure strip disposed on the left and right sides of the body, respectively. The first elastic pressure strip presses against the inner wall and side end face of the magnet to provide radial and circumferential limiting of the magnet. The second elastic pressure strip presses against the upper and lower end faces of the magnet to provide axial limiting of the magnet. According to the specification, in embodiments of this utility model, the fixing plate is bonded or riveted to the inner wall of the housing, and the ends of the two pressure plates away from the fixing plate are bonded or riveted to the inner wall of the housing; furthermore, in embodiments of this utility model, the first elastic pressure strip is hook-shaped and extends towards the center of the housing. Therefore, this utility model is actually a combination of two utility model solutions with application numbers CN201921827104.4 and CN201921827002.2, and there is no substantial difference. It also has the defect of causing the magnet to fall off and occupying the space of the rotor, resulting in a larger gap between the rotor and the magnet, which will affect the starting performance of the starter.

[0007] To ensure the secure fixing of multiple circumferentially evenly distributed magnets to the inner wall of the starter stator housing, thereby guaranteeing the starter stator's vibration resistance, utility model application CN201520939482.7 discloses "a stator and magnet clip assembly mold." This utility model includes an assembly column with several circumferentially arranged slots for placing magnet clips. Each slot has an assembly opening facing outwards from the assembly column, and a pushing mechanism for ejecting the magnet clips from the slots. The pushing mechanism includes a pushing seat and a pushing block, wherein the pushing block is located at... The placement slot allows the pusher block to slide radially relative to the assembly column. The pusher block extends into the assembly column, and its end extending into the assembly body has a guide ramp that guides the pusher block to slide outwards from the assembly column. The guide ramp gradually approaches the center of the assembly column as it rises vertically. The pusher seat includes a top column placed below the assembly column. The top of the top column has a tapered surface along its circumference. A linkage cavity is provided below the assembly column for the tapered column to extend into. The smaller end of the tapered surface faces the assembly column, and the outer circumferential surface of the tapered column abuts against the guide ramp of the pusher block. In use, the magnetic tile clamp to be assembled is first placed vertically in the placement slot. Then, the stator housing is fitted onto the assembly column with the placement slot. Finally, the pusher mechanism pushes the magnetic tile clamp between the magnetic tiles of the stator housing, completing all the steps. This utility model essentially consists of a pusher block of a pusher mechanism that extends downwards into the assembly column and can move up and down. The guide slope of the pusher block abuts against a tapered surface with its small end facing upwards, located circumferentially at the top of a top column below the assembly column. The stator housing is then fastened onto the assembly column by external force, and the top column below the assembly column pushes it upwards, pushing the magnetic tile clamp out of its placement slot and into the gap between the magnetic tiles, thus completing accurate installation. However, as described in the background section of patent application CN201710685983.0, which cites this utility model as background technology, firstly, this utility model does not provide a specific method for fixing the magnetic tiles in the stator housing; secondly, fixing the magnetic tiles requires pre-connection using an adhesive before they can be fitted with the magnetic tile clamp. Therefore, although this utility model facilitates the installation of the magnetic tile clip, if the magnetic tile also needs to be pre-connected with adhesive before it can be used with the magnetic tile clip, then, like the aforementioned utility models with application numbers CN201921827104.4, CN201921827002.2 and 202123241926.4, it also suffers from the defect that the magnet is easy to fall off.

[0008] The invention disclosed in application number CN201710685983.0, entitled "An Assembly Method for a Tension-Type Starter Stator Assembly," employs an assembly device including a support column, a sliding sleeve, and a tensioning mechanism. The tensioning mechanism cooperates with the sliding sleeve to fix the magnetic tiles (i.e., magnets) and magnetic tile clamps (i.e., elastic clamps). In the tensioning mechanism, struts are evenly distributed circumferentially along the central column, and the struts can extend and retract radially along the central column. During assembly, the magnetic tiles and magnetic tile clamps are pre-assembled, and then the stator housing is placed in the positioning groove and pressed together using a press-fitting machine. Although this invention does not require the use of adhesive bonding, however, in conjunction with this invention… Figure 4 As can be seen, the positioning strip on the inner wall of the sliding sleeve described in this invention is simply a rectangular plane protruding from the inner wall of the sliding sleeve. A magnetic tile groove is formed between adjacent positioning strips for placing magnetic tiles. During use, the magnetic tiles rest against the magnetic tile groove of the sliding sleeve, and the magnetic tile clamp is restrained between two adjacent magnetic tiles, completing the pre-assembly of the magnetic tiles and magnetic tile clamp. Then, the assembled device is placed under the press-fitting machine, the stator housing is aligned with the inner cavity of the sliding sleeve, and the stator housing is pressed down using a cylinder. The stator housing then presses down on the sliding sleeve, and the stator housing and the sliding sleeve move downwards together. The assembled magnetic tiles and clamps are directly assembled into the stator housing in one step. This invention utilizes the stator housing to press against the sliding sleeve; a pressure component applies downward pressure to the stator housing, causing the sliding sleeve to slide downwards. As the stator housing moves downwards, the magnetic tiles and clamps are inserted into the stator housing cavity from the bottom. This method risks damage to the stator housing during press-fitting. Furthermore, because the positioning strip on the inner wall of the sliding sleeve is merely a rectangular plane protruding from the inner wall, the assembly accuracy of the magnetic tiles and clamps is relatively low. In contrast, this invention features a slot at the upper end of the sliding sleeve, within which a guide ring is installed. The outer wall of the guide ring mates with the slot, and the interior of the guide ring is a circular structure that mates with the stator housing. The guide ring guides the magnetic tiles and clamps into the stator housing during press-fitting, fulfilling the press-fitting requirements. A positioning plate is fixed to the end face of the guide ring, located at the same end as the guide ring's positioning groove. This positioning plate mates with a notch on the stator housing to prevent incorrect operation during assembly from affecting the magnetic poles. To reduce errors during assembly, markings are engraved on the upper surfaces of the guide ring and the sliding sleeve. These markings can be lines, scratches, or raised areas, preferably engravings. Specifically, markings or engravings are made on the upper surfaces of the guide ring and the sliding sleeve. Each time the guide ring is assembled, the engravings must be aligned to reduce errors caused by tooling. This structure, which separates the pre-assembled components into two parts—the sliding sleeve and the guide ring—increases the chance of assembly errors during pre-assembly. Furthermore, the positioning plate is only fixed to the end face of the guide ring, resulting in poor positioning accuracy. While marking the upper surfaces of the guide ring and the sliding sleeve to reduce assembly errors further increases the pre-assembly time, improvements are necessary. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to overcome the shortcomings and defects of the prior art and provide an assembly tooling for a starter stator without auxiliary poles, in which the magnet and the elastic plate can be firmly pressed against the inner wall of the housing without the use of adhesive.

[0010] The technical solution adopted in this invention includes a worktable, an upper cylinder, an upper pressure head, a lower cylinder, a lower cylinder connecting rod, a horizontal cylinder, a magnetic positioning rod lifting cylinder, and a pre-installed bushing. The pre-installed bushing includes an annular positioning sleeve. Four to six elastic plate guide strips are evenly distributed circumferentially on the inner wall of the annular positioning sleeve to pre-guide the elastic plates. Each elastic plate guide strip extends towards the lower end of the annular positioning sleeve. The inner wall of the elastic plate guide strip located on the inner wall of the annular positioning sleeve has an inwardly protruding Z-shaped guide surface. The Z-shaped guide surfaces of two adjacent elastic plate guide strips... An elastic guide groove is formed between the side walls. The upper end of the elastic guide strip, which is higher than the upper surface of the annular positioning sleeve, has an outwardly protruding positioning plane. A through-hole is machined on one of these positioning planes, and a positioning plate is installed therein for engaging with a U-shaped groove on the starter stator housing. The inner side of the positioning plate is tightly against the outer wall of the elastic guide strip. A hook seat is fixedly connected at the center of the worktable. Four to six hook grooves are evenly distributed circumferentially on the upper surface of the hook seat. An L-shaped hook is installed in each hook groove. The L-shaped hook includes... The system includes a horizontal tie rod and a vertical tie rod. One end of the horizontal tie rod has a through-hole for connection with a horizontal cylinder, and the other end has a through-hole for a magnetic positioning rod. The inner surface of the vertical tie rod has a first housing protrusion avoidance groove and a second housing protrusion avoidance groove. The upper half of the vertical tie rod is thinner than the lower half, forming a transition slope. A rectangular plane is formed on the top surface of the vertical tie rod. The horizontal tie rod is fixedly connected to the piston rod of the horizontal cylinder. The upper half of the vertical tie rod... The side is provided with a contact slope, and the angle between the contact slope and the outer side of the vertical tie rod is α. An assembly expansion block is installed in the inner cone formed by 4 to 6 contact slopes. The inner cone formed by 4 to 6 L-shaped hooks is slidably connected to the frustum side of the assembly expansion block. A pressure head is installed on the upper end of the pre-installed bushing. An expansion block connecting plate is installed on the upper end of the lower cylinder connecting rod. The expansion block connecting plate is fixedly connected to the assembly expansion block. A cylinder push plate is connected to the upper end of the piston rod of the magnetic positioning rod lifting cylinder. 4 to 6 magnetic positioning rods are installed on the cylinder push plate.

[0011] The assembly expansion block is a frustum shape that is wider at the top and narrower at the bottom. The angle of the frustum side of the assembly expansion block is equivalent to the angle of the contact slope of the L-shaped hook. The upper surface of the assembly expansion block is provided with a central hole of the frustum that runs through the top and bottom and two blind threaded holes that are symmetrical to the vertical center line.

[0012] The included angle α between the contact inclined surface and the outer side surface of the vertical pull rod is 20° to 25°.

[0013] The magnetic steel elastic clamping plate comprises an elastically deformable clamping plate body protruding rearwards, vertical magnetic steel elastic clamping plate flanks are arranged on the left and right sides of the magnetic steel elastic clamping plate body, magnetic steel elastic clamping plate upper arms are arranged on the left and right sides of the upper end of each magnetic steel elastic clamping plate flank, the magnetic steel elastic clamping plate body, the magnetic steel elastic clamping plate flanks and the magnetic steel elastic clamping plate upper arms form a shape similar to a Chinese character "几", and a magnetic steel elastic clamping plate fixing hole is formed on the upper surface of the magnetic steel elastic clamping plate body.

[0014] An upwardly protruding expansion core washer is arranged at the center of the upper surface of the pull hook seat, a groove is formed on the upper surface of the expansion core washer, and a positioning block is installed in the groove.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) According to the present invention, an assembly expansion block is installed in an inner cone formed by 4 to 6 L-shaped pull hooks, the inner cone formed by the 4 to 6 L-shaped pull hooks is in sliding connection with the outer conical surface, i.e. the side surface of the circular truncated cone of the assembly expansion block, the L-shaped pull hooks are fixedly connected with the piston rod of a horizontal cylinder, the assembly expansion block is an integral circular truncated cone, so that there is no problem of shaking of the assembly expansion block or the L-shaped pull hooks during the pressing-down process, and the expansion and contraction of the L-shaped pull hooks are controlled by the horizontal cylinder, thus the structure is compact, and the operation is stable and reliable.

[0016] (2) According to the present invention, the upper pressing head of the assembly tool presses the elastic clamping plate downwards to a preset height and compresses the preassembled bush, which not only ensures that the stator housing is accurately installed in place, but also ensures that the stator housing is not damaged, and the installation accuracy of the magnetic steel and the magnetic steel elastic clamping plate is high. (3) According to the present invention, through the dual functions of the outward expansion force provided to the L-shaped pull hooks by pulling the assembly expansion block downwards via the lower cylinder and the pulling force for pulling the L-shaped pull hooks outwards via the horizontal cylinder, the elastic clamping plate is tensioned and fixed on the inner wall of the stator housing, which meets the expansion force required for firmly expanding and fastening the magnetic steel on the inner wall of the stator housing.

[0017] (4) According to the present invention, the quick positioning of the stator housing is realized by matching the assembly positioning port at the lower end of the stator housing with the positioning block on the expansion core washer, the quick positioning of the preassembled bush is realized by aligning the positioning plate of the preassembled bush with the U-shaped groove on the stator housing, and the elastic clamping plate is quickly and accurately installed in place by installing the elastic clamping plate into the stator housing via the elastic clamping plate guide strip of the preassembled bush, so that the installation efficiency of the magnetic steel and the elastic clamping plate is improved, and the installation accuracy is high.

[0018] (5) The pre-installed bushing of the present invention and the elastic clamping plate guide strip are integrally precision cast. The lower end of the positioning plate is closely attached to the outer wall of the elastic clamping plate guide strip. The structure is stable and can be quickly positioned. Furthermore, since the inner wall of the elastic clamping plate guide strip is provided with an inwardly protruding Z-shaped guide surface, which cooperates with the Z-shaped elastic clamping plate, the elastic clamping plate can be accurately installed in place. Therefore, the installation accuracy of the elastic clamping plate is high, which provides technical support for the subsequent elastic clamping plate to tighten and fix the magnet to the inner wall of the stator housing.

[0019] (6) Using the assembly fixture of the present invention, the upper end face of the magnet is pressed by the upper arm of the elastic clamp plate. The upper arm of the elastic clamp plate and the bottom positioning point of the magnet on the inner wall of the stator housing play a role in axially limiting the magnet from both the top and bottom directions. The elasticity of the elastic clamp plate itself causes the side wings of the elastic clamp plate to expand tightly on the sides of two adjacent magnets, which plays a role in circumferentially limiting the magnet. By pulling the L-shaped hook outward by the horizontal cylinder, the elastic clamp plate also plays a role in radially limiting the magnet. The elastic clamp plate fixing hole is provided on the body of the elastic clamp plate. The internal protrusions on the positioning points of the stator housing clamp plate serve to limit the elastic clamp plate itself, thereby ensuring that the elastic clamp plate limits the magnet in both the circumferential and radial directions. Therefore, this invention enables the elastic clamp plate to limit the magnet in all directions (axial, circumferential, and radial), thus firmly fixing the magnet to the inner wall of the stator housing and fundamentally preventing the magnet from falling off. Furthermore, the magnet and the back of the elastic clamp plate do not require adhesive to firmly fix the magnet to the inner wall of the stator housing, reducing costs. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the present invention after concealing the upper cylinder and upper pressure head; Figure 2 This is the front view of the present invention; Figure 3 yes Figure 2 Top view after hiding the upper cylinder and upper pressure head; Figure 4 This is a perspective view of the L-shaped hook of the present invention; Figure 5 This is a front view of the L-shaped hook of the present invention; Figure 6 yes Figure 5 Top view; Figure 7 This is a perspective view of the pre-installed bushing of the present invention; Figure 8 This is a front view of the pre-installed bushing of the present invention; Figure 9 yes Figure 8 Top view; Figure 10 yes Figure 8 A bottom view; Figure 11 yes Figure 8 AA section view; Figure 12 This is a schematic diagram of the structure of the assembled expansion block of the present invention; Figure 13 This is a front view of the starter stator housing to be installed according to the present invention; Figure 14 This is a front view of the elastic card plate of the present invention. Figure 15 yes Figure 14 A magnified top-down view.

[0021] In the picture: 1. Pre-installed bushings, 1-1. Annular positioning sleeve; 1-2. Elastic clamping plate guide strip; 1-3. Flexible guide groove for the card plate; 1-4. Positioning plane; 1-5. Positioning plate. 2. Magnetic positioning rod, 3. L-shaped pull hook, 3-1. Pin hole; 3-2. Horizontal tie rod; 3-3 Rectangular through hole; 3-4 First housing protrusion avoidance groove. 3-5. Second housing protrusion avoidance groove; 3-6. Contact slope. 3-7. Vertical tie rod; 3-8. Rectangular plane; 3-9. Transition slope. 4. Pin, 5. Cylinder connecting rod, 6. Horizontal cylinder, 7. Workbench 8. Lower cylinder mounting bracket, 9. Magnet positioning rod lifting cylinder 10. Lower cylinder, 11. Lower cylinder connecting rod, 12. Cylinder push plate, 13. Hook seat, 13-1. Hook groove; 13-2. Expansion core washer. 14. Assemble the expansion blocks. 14-1. Center hole of the frustum; 14-2. Blind threaded hole; 14-3. Side of the frustum. 15. Upper pressure head, 16. Install the cylinder. 17. Expansion block connecting plate, 18. Flexible pallet, 18-1. Elastic plate upper arm; 18-2. Elastic plate side wing; 18-3. Flexible clamp fixing hole; 18-4. Flexible clamp body; 19. Stator housing, 20. Positioning block. Detailed Implementation

[0022] like Figures 1-3 As shown, the technical solution adopted by the present invention includes a workbench 7, and a hook seat 13 is fixedly connected to the center of the workbench 7 by screws. Hook grooves 13-1 are evenly distributed circumferentially on the upper surface of the hook seat 13. The number of hook grooves 13-1 is the same as the number of L-shaped hooks to be installed. In a specific embodiment of the present invention, there are 4 to 6 hook grooves 13-1. An L-shaped hook 3 for pulling and fixing the elastic plate 18 to the inner wall of the machine housing is installed in each hook groove 13-1. like Figures 4-6 As shown, the L-shaped hook 3 includes a horizontal pull rod 3-2 and a vertical pull rod 3-7. One end of the horizontal pull rod 3-2 is provided with a vertically penetrating pin hole 3-1 for connecting with a horizontal cylinder. The other end of the horizontal pull rod 3-2 is provided with a vertically penetrating rectangular through hole 3-3 for the passage of a magnetic positioning rod. The inner side of the vertical pull rod 3-7 is provided with a first housing protrusion avoidance groove 3-4 and a second housing protrusion avoidance groove 3-5. The upper half of the vertical pull rod 3-7 is thinner than the lower half, forming a transition slope 3-9. The outer side of the upper half of the vertical pull rod 3-7 is provided with a contact slope 3-6. The angle α between the contact slope 3-6 and the outer side of the vertical pull rod 3-7 is 20° to 25°. A rectangular plane 3-8 is formed on the top surface of the vertical pull rod 3-7. like Figures 1-3 As shown, an assembly expansion block 14 for pressing down the magnet is installed in the inner cone formed by the contact slopes 3-6 of 4 to 6 L-shaped hooks 3; like Figure 12 As shown, the assembly expansion block 14 is a frustum shape that is wider at the top and narrower at the bottom. The angle of the frustum side 14-3 of the assembly expansion block 14 is approximately the same as the angle of the contact slope 3-6 of the L-shaped hook 3. The upper surface of the assembly expansion block 14 is provided with a frustum center hole 14-1 that runs vertically through the top and bottom and two blind threaded holes 14-2 that are symmetrical to the vertical center line. like Figures 1-3 As shown, the inner cone formed by 4 to 6 contact inclined surfaces 3-6 is slidably connected to the frustum side surface 14-3 of the assembled expansion block 14. In other words, the frustum side surface 14-3 of the assembled expansion block 14, which is wider at the top and narrower at the bottom, is the outer cone, and the frustum cavity formed by the contact inclined surfaces 3-6 of 4 to 6 L-shaped hooks 3, which is wider at the top and narrower at the bottom, is the inner cone. The inner cone formed by the contact inclined surfaces 3-6 of 4 to 6 L-shaped hooks 3 is slidably connected to the outer cone of the assembled expansion block 14. like Figures 7-11As shown, the present invention also includes a pre-installed bushing 1, which includes an annular positioning sleeve 1-1. Elastic guide strips 1-2 are evenly distributed circumferentially on the inner wall of the annular positioning sleeve 1-1. Each elastic guide strip 1-2 extends towards the lower end of the annular positioning sleeve 1-1, with the extension height ≤ the height of the pre-installed magnet. The inner wall of the elastic guide strip 1-2 located on the inner wall of the annular positioning sleeve 1-1 has an inwardly protruding Z-shaped guide surface. An elastic guide groove 1-3 is formed between the side walls of the Z-shaped guide surfaces of two adjacent elastic guide strips 1-2. The number of plate guide strips 1-2 and elastic plate guide grooves 1-3 is the same as the number of magnets to be installed. In a specific embodiment of the present invention, there are 4 to 6 elastic plate guide grooves 1-3. The upper end of the elastic plate guide strip 1-2, which is higher than the upper surface of the annular positioning sleeve 1-1, is provided with an outwardly protruding positioning plane 1-4. A positioning plate mounting hole that runs vertically through one of the positioning planes 1-4 is machined in one of them, and a positioning plate 1-5 for cooperating with the U-shaped groove on the starter stator housing is installed therein. The inner side of the positioning plate 1-5 is in close contact with the outer wall of the elastic plate guide strip 1-2. like Figures 1-12 As shown, an upper cylinder 16 and an upper pressure head 15 fixedly connected to the piston rod of the upper cylinder 16 are installed on the upper end of the pre-installed bushing 1. A pin 4 is installed in the pin hole 3-1 of the horizontal pull rod 3-2 of the L-shaped hook 3. The horizontal pull rod 3-2 of the L-shaped hook 3 is fixedly connected to the cylinder connecting rod 5 through the pin 4, thereby fixing the L-shaped hook 3 to the horizontal cylinder 6. Driven by the horizontal cylinder 6, the L-shaped hook 3 can move horizontally. The upper surface of the hook seat 13 is provided with an upwardly protruding expansion core washer 13-2. A groove is provided on the upper surface of the expansion core washer 13-2, and a positioning block 20 is installed in the groove. A lower cylinder fixing bracket 8 is fixedly connected to the bottom of the worktable 7 by screws. A lower cylinder 10 is installed on the lower cylinder fixing bracket 8. The upper end of the piston rod of the lower cylinder 10 is connected to the lower cylinder connecting rod 11. An expansion block connecting plate 17 is installed at the upper end of the truncated cone center hole 14-1 of the assembly expansion block 14, and is fixed to the assembly expansion block 14 with screws through the expansion block connecting plate 17. The assembly expansion block 14 is moved up and down by the lower cylinder 10. A magnetic steel positioning rod lifting cylinder 9 is also installed on the lower cylinder fixing frame 8. The upper end of the piston rod of the magnetic steel positioning rod lifting cylinder 9 is connected to the cylinder push plate 12. Magnetic steel positioning rods 2 are installed on the cylinder push plate 12. The number of magnetic steel positioning rods 2 is the same as the number of magnets to be installed. In a specific embodiment of the present invention, there are 4 to 6 magnetic steel positioning rods 2. The 4 to 6 magnetic steel positioning rods 2 pass through the rectangular through hole 3-3 on the horizontal tie rod 3-2 from the bottom upward and correspond one-to-one with the 4 to 6 elastic card plate guide grooves 1-3 of the pre-installed bushing 1. Under the drive of the magnetic steel positioning rod lifting cylinder 9, they play the role of positioning the assembly position of the magnets.

[0023] like Figure 14 and Figure 15 as shown, the elastic clamping plate 18 comprises an elastic clamping plate body 18-4 protruding backward, vertical elastic clamping plate flanks 18-2 are arranged on the left and right sides of the elastic clamping plate body 18-4, elastic clamping plate upper arms 18-1 are arranged on the left and right sides of the upper end of the elastic clamping plate flanks 18-2, the elastic clamping plate body 18-4, the elastic clamping plate flanks 18-2 and the elastic clamping plate upper arms 18-1 form a shape similar to the Chinese character "几", and an elastic clamping plate fixing hole 18-3 is arranged on the elastic clamping plate body 18-4.

[0024] When in use, proceed according to the following steps: In the first step, the stator housing and the pre-assembled magnetic steel are installed: start the magnetic steel positioning rod lifting cylinder 9, drive the cylinder push plate 12 to move 4 to 6 magnetic steel positioning rods 2 upward through the rectangular through hole 3-3 of the L-shaped pull hook 3 to reach the height of the magnetic steel assembly position in the stator housing, and Figure 13 fit the stator housing 19 as shown on the outer circle formed by the 4 to 6 magnetic steel positioning rods 2, the lower end assembly positioning opening 19-1 cooperates with the positioning block 20 on the expansion core washer 13-2 to realize rapid positioning of the stator housing 19, and a magnetic steel installation gap is formed between the inner wall of the stator housing 19 and the 4 to 6 magnetic steel positioning rods 2; pre-assemble the magnetic steel in this installation gap; In the second step, the magnetic steel positioning rods are withdrawn: start the magnetic steel positioning rod lifting cylinder 9, drive the cylinder push plate 12 to move the magnetic steel positioning rods 2 downward through the rectangular through hole 3-3 of the L-shaped pull hook 3 to reach the height separated from the vertical pull rod 3-7 of the L-shaped pull hook 3; In the third step, the elastic clamping plate is pre-assembled: align the pre-assembled bushing 1 with the U-shaped groove 19-2 on the stator housing 19 as shown through the positioning plate 1-5 Figure 13 , install the pre-assembled bushing 1 on the upper end of the stator housing 19 to realize rapid positioning of the pre-assembled bushing 1, and then pre-assemble the elastic clamping plate as shown between two adjacent magnetic steels on the inner wall of the stator housing 19 sequentially under the guidance of the elastic clamping plate guide grooves 1-3 on the inner walls of the 4 to 6 elastic clamping plate guide strips 1-2 of the pre-assembled bushing 1 Figure 14 and Figure 15 as shown, start the upper cylinder 16, drive the upper pressing head 15 to move downward, so that the elastic clamping plate 18 is pressed into the gap left after the magnetic steel positioning rods 2 are withdrawn; and the elastic clamping plate is positioned through the cooperation of the elastic clamping plate fixing hole 18-3 of the elastic clamping plate 18 and the positioning convex point 19-3 on the inner wall of the stator housing 19; Step 4, Tightening: Activate the horizontal cylinder 6, which pulls the L-shaped hooks 3 outward via the cylinder connecting rod 5, providing tightening force to the L-shaped hooks and tightening the elastic clamping plate 18 onto the inner wall of the stator housing 19. Simultaneously, activate the lower cylinder 10, which moves the assembly expansion block 14 downward via the lower cylinder connecting rod 11. The frustum side 14-3 of the assembly expansion block 14 presses down against the contact slopes 3-6 of 4-6 L-shaped hooks 3, assisting the 4-6 L-shaped hooks 3 to expand outward, tightening and fixing the elastic clamping plate 18 onto the inner wall of the stator housing 19. At this time, the upper end face of the magnet is pressed by the upper arm 18-1 of the elastic clamping plate. The bottom positioning point 19-4 of the magnet on the inner wall of the stator housing 19, 18-1, serves to limit the axial movement of the magnet from both the top and bottom. The elasticity of the elastic plate 18 itself causes the elastic plate side wings 18-2 to expand and tighten on the sides of two adjacent magnets, thus limiting the circumferential movement of the magnet. The L-shaped hook 3 is pulled outward by the horizontal cylinder 6, which also serves to limit the radial movement of the magnet by the elastic plate 18. The elastic plate fixing hole 18-3 on the body of the elastic plate 18 cooperates with the plate positioning protrusion 19-5 on the inner wall of the stator housing 19, thus limiting the movement of the elastic plate 18 itself.

[0025] Fifth step: Remove the assembled starter stator and return it to the initial position.

Claims

1. An assembly fixture for a stator of a starter motor without auxiliary poles, comprising a worktable (7), an upper cylinder (16), an upper pressure head (15), a lower cylinder (10), a lower cylinder connecting rod (11), a horizontal cylinder (6), a magnetic positioning rod lifting cylinder (9), and a pre-assembled bushing (1), characterized in that, The pre-installed bushing (1) includes an annular positioning sleeve (1-1). Four to six elastic plate guide strips (1-2) are evenly distributed circumferentially on the inner wall of the annular positioning sleeve (1-1) to guide the pre-installation of the elastic plate (18). Each elastic plate guide strip (1-2) extends towards the lower end of the annular positioning sleeve (1-1). The inner wall of the elastic plate guide strip (1-2) located on the inner wall of the annular positioning sleeve (1) has an inwardly protruding Z-shaped guide surface. An elastic plate guide groove (1-3) is formed between the side walls of the Z-shaped guide surfaces of two adjacent elastic plate guide strips (1-2). The upper end of the elastic plate guide strip (1-2) above the upper surface of the annular positioning sleeve (1-1) has an outwardly protruding positioning plane. (1-4), a through-hole is machined on one of the positioning planes (1-4), and a positioning plate (1-5) is installed therein for engaging with a U-shaped groove on the starter stator housing. The inner side of the positioning plate (1-5) is tightly attached to the outer wall of the elastic guide strip (1-2). A hook seat (13) is fixedly connected at the center of the worktable (7). Four to six hook grooves (13-1) are evenly distributed circumferentially on the upper surface of the hook seat (13). An L-shaped hook (3) is installed in each hook groove (13-1). The L-shaped hook (3) includes a horizontal pull rod (3-2) and a vertical pull rod (3-7). One end of the horizontal pull rod (3-2) is provided for engaging with a horizontal cylinder ( 6) A vertically penetrating pin hole (3-1) is connected to the horizontal tie rod (3-2). A vertically penetrating rectangular through hole (3-3) is provided at the other end of the horizontal tie rod (3-2) for the magnetic positioning rod (2) to pass through. A first housing protrusion avoidance groove (3-4) and a second housing protrusion avoidance groove (3-5) are provided on the inner side of the vertical tie rod (3-7). The upper half of the vertical tie rod (3-7) is thinner than the lower half, forming a transition slope (3-9). A rectangular plane (3-8) is formed on the top surface of the vertical tie rod (3-7). The horizontal tie rod (3-2) is fixedly connected to the piston rod of the horizontal cylinder (6). The upper half of the vertical tie rod (3-7) has a contact slope (3-6) on its outer side. The included angle between the inclined surface (3-6) and the outer side of the vertical pull rod (3-7) is α. An assembly expansion block (14) is installed in the inner cone formed by 4 to 6 inclined surfaces (3-6). The inner cone formed by 4 to 6 L-shaped hooks (3) is slidably connected to the frustum side of the assembly expansion block (14). An upper pressure head (15) is installed at the upper end of the pre-installed bushing (1). An expansion block connecting plate (17) is installed at the upper end of the lower cylinder connecting rod (11). The expansion block connecting plate (17) is fixedly connected to the assembly expansion block (14). A cylinder push plate (12) is connected to the upper end of the piston rod of the magnetic steel positioning rod lifting cylinder (9). 4 to 6 magnetic steel positioning rods (2) are installed on the cylinder push plate (12).

2. The assembly fixture for a starter stator without auxiliary poles according to claim 1, characterized in that, The assembly expansion block (14) is in a truncated cone shape that is wider at the top and narrower at the bottom, the angle of the truncated cone side surface (14-3) of the assembly expansion block (14) is equivalent to the angle of the contact inclined surface (3-6) of the L-shaped pull hook (3), and the upper surface of the assembly expansion block (14) is provided with a vertically through truncated cone center hole (14-1) and two blind threaded holes (14-2) symmetric about the vertical center line on the left and right sides.

3. The assembly fixture for a non-auxiliary pole starter stator according to claim 1, characterized in that, The included angle α between the contact inclined surface (3-6) and the outer side surface of the vertical pull rod (3-7) is 20° to 25°.

4. The assembly fixture for a non-auxiliary pole starter stator according to claim 1, characterized in that, The magnet elastic clamping plate (18) comprises an elastically deformable clamping plate body (18-4) protruding rearward, vertical magnet elastic clamping plate flanks (18-2) are arranged on the left and right sides of the magnet elastic clamping plate body (18-4), magnet elastic clamping plate upper arms (18-1) are arranged on the left and right sides of the upper end of the magnet elastic clamping plate flanks (18-2), the magnet elastic clamping plate body (18-4), the magnet elastic clamping plate flanks (18-2) and the magnet elastic clamping plate upper arms (18-1) form a shape similar to the Chinese character "几", and a magnet elastic clamping plate fixing hole (18-3) is arranged on the magnet elastic clamping plate body (18-4).

5. The assembly fixture for a non-auxiliary pole starter stator according to claim 1, characterized in that, The center of the upper surface of the pull hook seat (13) is provided with an expansion core washer (13-2) protruding upward, the upper surface of the expansion core washer (13-2) is provided with a groove, and a positioning block (20) is installed in the groove.

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