A shrink fit assembly machine suitable for motor housing

Abstract

A shrink-fitting machine suitable for motor housings, comprising a first workbench, wherein the first workbench is provided with: an assembly station, for installing an inner housing with a sealing ring pre-installed on the bottom into an outer housing heated by the heating station, wherein the sealing ring protrudes from the bottom of the inner housing; characterized in that: the assembly station comprises: a press-fitting portion, connected to the inner housing, comprising a head and a tail extending upward along the axial direction of the end of the head; an anti-slip mechanism, arranged on the outer wall of the head adjacent to its bottom, comprising at least two support members arranged at intervals along the circumference of the head, and the outer edge of each support member is provided with a support portion for supporting the exposed portion of the sealing ring, wherein the support portion can release the support state with the sealing ring in the final position. The shrink-fitting machine is provided with an anti-slip mechanism at the head of the press-fitting portion, wherein the support portion can support the bottom of the sealing ring, thereby preventing the sealing ring from falling off during the assembly process of the inner housing.

Description

Technical Field

[0001] The invention relates to the technical field related to mechanical processing, and in particular to a shrink-fit assembly machine suitable for a motor housing. Background Art

[0002] The motor is the most important component in new energy vehicles. The rotation of the motor will generate a lot of heat, so the motor needs to be cooled. The current heat dissipation solution is mainly water cooling. In the prior art, the inner shell and the outer shell of the motor jointly form a channel for the flow of coolant. In order to ensure the sealing of the channel, the inner shell and the outer shell need to be interference fit. To this end, the Chinese utility model patent with application number CN202122841001.7 (authorization announcement number CN216252492U) previously applied by the applicant discloses "A shrink-fit assembly machine suitable for motor housings". The shrink-fit machine first heats the outer shell to make it expand. At this time, the inner shell can be easily installed in the outer shell. When the outer shell cools and shrinks, it directly achieves an interference fit with the inner shell.

[0003] However, in order to improve the sealing performance of the inner housing and the outer housing in the motor, another assembly problem will arise: Figure 1-2 The motor housing shown in the figure includes an inner housing 1' and an outer housing 2'. The inner housing 1' has a special requirement, that is, it must be sealed with the side wall and the bottom wall of the outer housing 2'. Therefore, before the inner housing 1' is assembled into the outer housing 2', a first sealing ring 11' needs to be installed on the side wall and a second sealing ring 12' needs to be installed on the bottom. In order to ensure good sealing between the inner housing 1' and the bottom wall of the outer housing 2', the key point in the structure is that the second sealing ring 12' needs to exceed the bottom of the inner housing 1' by a certain distance H.

[0004] If the above-mentioned shrink-fit assembly machine is used for assembly, although the inner shell 1' and the outer shell 2' can be matched, based on the special design of the inner shell 1', that is, the second sealing ring 12' must exceed the bottom of the inner shell 1' by a certain distance H, the above-mentioned shrink-fit assembly machine has the following defects: first, the second sealing ring 12' needs to be installed on the inner shell 1' first, because its deformation will accumulate a certain potential energy, and the part of the second sealing ring 12' that exceeds the inner shell 1' cannot be supported by the inner shell 1'. When the inner shell 1' is lifted, unbalanced force is likely to occur, causing the potential energy in the second sealing ring 12' to be released, resulting in the second sealing ring 12' falling off; second, if the positions of the inner shell 1' and the outer shell 2' in the assembly station of the above-mentioned shrink-fit assembly machine are swapped That is: the bottom of the inner shell 1' is set upwards and placed on the press-fitting station, and the outer shell 2' is installed above the station, and the inner shell 1' located below the assembly station is pressed upward so that it is installed into the outer shell 2', which can avoid the second sealing ring 12' from falling off during the movement of the inner shell 1'. However, due to the heavy weight of the outer shell 2', when it is installed above the station, there is a problem of difficulty in lifting by the staff, and it is necessary to add another station, such as a lifting station to assist in lifting the outer shell 2', which increases the assembly process and reduces the assembly efficiency; thirdly, if the second sealing ring 12' falls off or is not installed in place, it is difficult to detect and issue an alarm in time, resulting in poor sealing of the inner shell 1' and the outer shell 2' after assembly, and increasing the product failure rate. In summary, it is necessary to further improve the existing shrink-fit assembly machine. Summary of the invention

[0005] The first technical problem to be solved by the present invention is to provide a shrink fit assembly machine suitable for motor housing that can better prevent the sealing ring from falling off without changing the original basic structure of the overall assembly machine, in response to the above-mentioned existing technical status. The shrink fit assembly machine is particularly suitable for situations where the sealing ring needs to be installed to protrude from the bottom of the inner housing according to preset requirements.

[0006] The second technical problem to be solved by the present invention is to provide a shrink fit assembly machine that can reduce the assembly process of the inner shell and the outer shell and reduce the work intensity of the staff in view of the above-mentioned existing technical status.

[0007] The third technical problem to be solved by the present invention is to provide a shrink fit assembly machine that can prevent the inner housing from being found to have fallen off or improperly installed in time during the assembly process of the sealing ring in response to the above-mentioned existing technical status.

[0008] The technical solution adopted by the present invention to solve the above-mentioned first technical problem is: the shrink fit assembly machine suitable for the motor housing comprises a first workbench, and the first workbench is provided with:

[0009] A heating station, used for heating the outer shell;

[0010] An assembly station is arranged upstream of the heating station, and is used to install the inner shell with a sealing ring pre-installed on the bottom into the outer shell heated by the heating station, and the sealing ring protrudes from the bottom of the inner shell; characterized in that: the assembly station includes:

[0011] A press-fitting portion, connected to the inner shell, comprising a head portion and a tail portion extending upward along the axial direction of the end of the head portion;

[0012] The anti-drop mechanism is arranged on the outer wall of the head adjacent to the bottom thereof, and comprises at least two support members arranged at intervals along the circumference of the head, wherein:

[0013] An annular inner step for arranging a sealing ring is provided at the bottom periphery of the inner shell, the annular inner step includes a first wall surface located above and a second wall surface located below the first wall surface and connected to the first wall surface, and the sealing ring is respectively against the first wall surface and the second wall surface and is exposed to the second wall surface by a height of h1;

[0014] The outer edge of each of the supporting members is provided with a supporting portion for supporting the exposed portion of the sealing ring, and the supporting portion can release the supporting state with the sealing ring in the final position;

[0015] There is a first distance k1 between the support portion and the bottom of the inner shell, and the first distance k1 is not less than the height h2 of the second wall surface plus the height h1 of the exposed part of the sealing ring;

[0016] The relationship between the radial length d1 of the support portion exposed outside the second wall surface and the thickness D of the sealing ring satisfies: 1 / 3D≤d1≤1 / 2D;

[0017] The relationship between the thickness D of the sealing ring and the length d2 of the first wall surface satisfies: 0.7d2≤D≤0.9d2.

[0018] In order to enable the support portion to better support the sealing ring, preferably, the relationship between the thickness t1 of the support portion and the thickness t2 of the support member satisfies: 0.05t2≤t1≤0.25t2;

[0019] The relationship between the width w1 of the support portion extending in the circumferential direction and the width w2 of the support member satisfies: 1.5w2≤w1≤2.5w2. Since the thickness of the support portion plays a key role in the supporting effect of the sealing ring, as mentioned above, in order to ensure good sealing of the bottom wall of the inner shell and the outer shell, the key point in the structure is that the sealing ring must exceed the bottom of the inner shell by a certain distance H. Therefore, the thickness of the support portion is made very thin compared to the support member, so that the sealing ring and the inner shell can be pressed down to the outer shell to the maximum extent, and the sealing ring can be supported and released at the final position. In addition, the width of the support portion extending in the circumferential direction is also particularly critical to solve the problem of insufficient supporting force after the support portion becomes thinner. If the width of the support portion extending in the circumferential direction is too small, the effect of supporting the sealing ring will deteriorate. Therefore, the following relationship is satisfied: 1.5w2≤w1≤2.5w2, so that the support portion can support the sealing ring while meeting the maximum limit of downward pressure with the inner shell.

[0020] In order to enable the support part to release the holding state in the final position, preferably, the support is provided with a sliding part that can slide along the radial direction of the head, and the head is provided with a limiting groove that cooperates with the sliding part, and the limiting groove can limit the sliding part to only slide along the radial direction of the head, and the sliding part includes a first part connected to the support and a second part connected to the first part, and the second part is limited in the limiting groove. After the inner shell is installed in the assembly station, the sliding part slides in the limiting groove in a direction away from the center of the circle, driving the support and the support part to extend outward, so that the support part is exposed relative to the second wall surface, and supports the sealing ring on the inner shell; and after the inner shell reaches the final position, the sliding part slides along the limiting groove in a direction away from the sealing ring, driving the support and the support part to move inward into the second wall surface, and releasing the holding state with the sealing ring.

[0021] In order to enable the sliding part to drive the support part and the support part to switch between a supporting state and a released state relative to the sealing ring, preferably, the anti-slip mechanism also includes a first driving part, which is connected to the sliding part and can drive the sliding part to slide radially along the head in the limiting groove, so that the support part and the support part can slide with the sliding part, thereby releasing the supporting state of the support part and the sealing ring.

[0022] To solve the second technical problem, preferably, the assembly station further includes a support assembly, the support assembly is arranged on the outer wall of the head and is located above the anti-slip mechanism, the support assembly includes a second drive unit and at least two support members arranged at intervals along the circumference of the head, the support member can apply a support force to the inner wall of the inner shell, and can release the support state with the inner shell by means of the second drive unit after the support portion releases the support state, and the second drive unit is independent of the first drive unit. When installing the inner shell, the inner shell is placed on the first workbench, the press-fitting part moves downward, and after extending into the inner shell, each support member is driven to extend by the second drive unit, and a support force is applied to the inner wall of the inner shell. After the inner shell is lifted to a certain distance, each support member of the anti-slip mechanism is driven to extend so that the support portion drags the sealing ring; when the inner shell moves to the final position to complete the press-fitting, after the support portion releases the support state, the support member is retracted inward to release the support state with the inner shell.

[0023] Furthermore, the support member is provided with an anti-slip portion at one end close to the inner shell for preventing the support member and the inner shell from sliding relative to each other in the supporting state. The provision of the anti-slip portion increases the friction coefficient between the support member and the inner wall of the inner shell, thereby increasing the supporting strength of the support member.

[0024] To solve the third technical problem, preferably, the assembly station further includes a visual inspection module for detecting the installation state of the sealing ring, and the visual inspection module is arranged adjacent to the press-fitting portion and faces the sealing ring. The visual inspection module can perform a visual inspection on the installation state of the sealing ring before the shrink fit assembly machine performs the press-fitting action to ensure that the sealing ring is in a well-installed state during press-fitting.

[0025] In order to be able to detect the installation status of the sealing ring in all directions, preferably, the tail portion extends outward to form an extension platform, and a third driving part is arranged on the extension platform, and the third driving part can drive the inner housing to rotate together with the press-fitting part so as to cooperate with the visual inspection module to detect the installation status of the sealing ring. When performing visual inspection, the third driving part drives the inner housing to rotate one circle to ensure that the sealing rings at various positions are installed intact to avoid the situation where the sealing rings are not installed properly.

[0026] The third driving unit can select various driving components with driving capability. From the perspective of simple structure, preferably, the third driving unit includes a driving source and a transmission component, and the transmission component includes:

[0027] A driving wheel, arranged at the output end of the driving source;

[0028] A driven wheel connected to the press-fitting portion and coaxially arranged with the press-fitting portion, wherein the press-fitting portion and the inner housing can rotate along with the driven wheel;

[0029] The transmission belt connects the driving wheel and the driven wheel, and can transmit the force of the driving wheel to the driven wheel so that it rotates with the driving wheel. The driving source can be a driving source with driving capability such as a motor; and the transmission component can also be a gear transmission or a direct drive of the driving source to drive the inner shell to rotate.

[0030] In order to enable the press-fitting part to have the ability to press-fit the inner shell to the final position, preferably, the assembly station is further provided with a first conveying mechanism, and the first conveying mechanism includes:

[0031] A first guide rail is arranged parallel to the axial direction of the press-fitting portion;

[0032] A connecting member, disposed on the first guide rail and connected to the extension platform of the press-fitting portion, the connecting member being located at the outer edge of the transmission assembly;

[0033] The fourth driving part is used to drive the press-fitting part to move along the first guide rail to move the inner housing connected to the press-fitting part from an initial position to a final position. The first guide rail prevents the press-fitting part from shaking during press-fitting, thereby improving the stability of the shrink-fitting machine.

[0034] Compared with the prior art, the advantages of the present invention are:

[0035] 1. The shrink-fit assembly machine is equipped with an anti-drop mechanism at the head of the press-fitting part, and its support part can support the bottom of the sealing ring to prevent the sealing ring from falling off during the assembly process of the inner shell;

[0036] 2. Due to the specific design of the annular inner step in the inner shell, in order to avoid interference between the anti-slip mechanism and the part of the sealing ring exposed on the second wall, a gap needs to be reserved between the anti-slip mechanism and the bottom of the inner shell to accommodate the exposed part of the sealing ring. Therefore, the first spacing k1 between the support portion and the bottom of the inner shell is designed to be not less than the sum of the height h2 of the second wall and the height h1 of the exposed part of the sealing ring. In order to ensure good sealing between the sealing ring and the bottom wall of the outer shell, the thickness of the sealing ring cannot be too large or too small. Therefore, the thickness D of the sealing ring and the length d2 of the first wall are limited to: 0.7d2≤D≤0.9d2. Within this thickness range, the sealing ring can have an interference fit with the bottom wall of the outer shell, while avoiding the contact between the sealing ring and the side wall of the outer shell affecting its fit with the bottom wall.

[0037] 3. Since an interference fit is required between the sealing ring and the bottom wall of the outer shell, in order to prevent the anti-slip mechanism from being squeezed between the sealing ring and the bottom wall of the outer shell and unable to release the supporting state, and at the same time, in the supporting state, the anti-slip mechanism can support the sealing ring to prevent it from falling off, the radial length d1 of the supporting portion of the anti-slip mechanism exposed relative to the second wall surface cannot be too large or too small. Therefore, the relationship between the radial length d1 of the supporting portion exposed relative to the second wall surface and the thickness D of the sealing ring is limited to: 1 / 3D≤d1≤1 / 2D. If d1 is too small, it is difficult to support the sealing ring. Otherwise, it will cause the supporting portion to be squeezed between the sealing ring and the bottom wall of the outer shell and it will be difficult to release the supporting state. Within this range, the anti-slip mechanism can support the sealing ring during assembly, and at the same time, the supporting state can be released after the inner shell is pressed down into the outer shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 An exploded view of a motor housing in the background technology of the present invention;

[0039] Figure 2 It is a cross-sectional view of the inner shell in the background technology of the present invention;

[0040] Figure 3 This is a schematic diagram of the structure of the shrink fit assembly machine in Example 1 of the present invention;

[0041] Figure 4 This is a schematic diagram of the structure of the heating station and the assembly station in Example 1 of the present invention;

[0042] Figure 5 This is a schematic diagram of the structure of an assembly station in Example 1 of the present invention;

[0043] Figure 6 This is a structural schematic diagram of the supporting portion in the supporting state in Embodiment 1 of the present invention;

[0044] Figure 7 for Figure 6 Sectional view at P in the middle;

[0045] Figure 8 It is a structural schematic diagram of the press-fitting part in Example 1 of the present invention;

[0046] Fig. 9 It is a schematic structural diagram of the press-fitting portion and the inner shell in Embodiment 1 of the present invention;

[0047] Fig.10 for Fig. 9 A cross-sectional view of

[0048] Fig.11 This is a schematic diagram of the structure of the outer shell being transferred to the heating station in Example 1 of the present invention;

[0049] Fig.12This is a structural schematic diagram of a heating station in a heating state in Example 1 of the present invention;

[0050] Fig.13 This is a schematic diagram of the structure of the inner housing installed at the assembly station in Embodiment 1 of the present invention;

[0051] Fig.14 This is a schematic diagram of the structure of the outer shell being transferred to the assembly station in Embodiment 1 of the present invention;

[0052] Fig.15 for Fig.14 Enlarged view of the middle Q;

[0053] Fig.16 This is a schematic diagram of the structure of the press-fitting part pressing down in Example 1 of the present invention;

[0054] Fig.17 It is a structural schematic diagram of the press-fitting part rising after the assembly is completed in Example 1 of the present invention;

[0055] Fig.18 is a cross-sectional view of the assembled outer shell in Example 1 of the present invention;

[0056] Fig.19 It is a schematic diagram of the structure of the shrink fit assembly machine in Example 2 of the present invention. DETAILED DESCRIPTION

[0057] The present invention is further described in detail below with reference to the accompanying drawings.

[0058] Example 1

[0059] like Figure 3-18As shown, it is the best embodiment of the present invention. The shrink fit assembly machine suitable for motor housing in this embodiment includes a first workbench 1, which is provided with a heating station 2 for heating the outer housing A and an assembly station 3 arranged upstream of the heating station 2. The assembly station 3 is used to install the inner housing C with a sealing ring B pre-installed on the bottom into the outer housing A heated by the heating station 2. The pre-installed sealing ring B protrudes from the bottom of the inner shell C. The inner shell C is provided with an annular inner step C1 for setting the sealing ring B. The annular inner step C1 includes a first wall C11 located above and a second wall C12 located below and connected to the first wall C11. The sealing ring B is respectively against the first wall C11 and the second wall C12 and the height of the second wall C12 exposed is h1. The thickness D of the sealing ring B is designed to be 0.7 times the length d2 of the first wall C11: D=0.7d2. In this way, it can ensure that the sealing ring B and the bottom wall of the outer shell A are well sealed, and it can also avoid the contact between the sealing ring B and the side wall of the outer shell A affecting the cooperation between the sealing ring B and the bottom wall. The assembly station 3 includes a press-fitting portion 31, an anti-slip mechanism 32, a support assembly 33, a visual inspection module 34 and a first conveying mechanism 35.

[0060] The press-fitting portion 31 is connected to the inner shell C, and includes a head portion 31 a and a tail portion 31 b extending upward along the axial direction of the end of the head portion 31 a .

[0061] like Figure 5-8As shown, the anti-slip mechanism 32 is arranged on the outer wall of the head 31a adjacent to the bottom thereof, and includes at least two support members 321 arranged at intervals along the circumference of the head 31a and a first driving part 324. The outer edge of each support member 321 is provided with a support portion 322 for supporting the exposed portion of the sealing ring B, and the support portion 322 can release the support state with the sealing ring B in the final position. Due to the specific design of the annular inner step C1 in the inner shell C, in order to avoid interference between the anti-slip mechanism 32 and the portion of the sealing ring B exposed on the second wall surface C12, a gap needs to be reserved between the anti-slip mechanism 32 and the bottom of the inner shell C to accommodate the exposed portion of the sealing ring B. In this embodiment, there is a first spacing k1 between the support portion 322 and the bottom of the inner shell C, and the first spacing k1 is equal to the height h2 of the second wall surface C12 plus the height h1 of the exposed portion of the sealing ring B. When the sealing ring B is pressed down into the outer shell A together with the inner shell C, the sealing ring B and the bottom wall of the outer shell A are interference fit. To prevent the anti-slip mechanism 32 from being squeezed between the sealing ring B and the bottom wall of the outer shell A and unable to release the supporting state, the anti-slip mechanism 32 can also support the sealing ring B to prevent it from falling off in the supporting state. In this embodiment, the radial length d1 of the supporting portion 322 exposed relative to the second wall surface C12 is 1 / 2 of the thickness D of the sealing ring B: d1=1 / 2D. In addition, since the thickness of the support portion 322 plays a key role in the supporting effect of the sealing ring B, as mentioned above, in order to ensure good sealing between the bottom wall of the inner shell C and the outer shell A, the key point in the structure is that the sealing ring B must exceed the bottom of the inner shell C by a certain distance H. Therefore, the thickness of the support portion 322 is made very thin compared to the support member 321, so that the sealing ring B together with the inner shell C can be pressed into the outer shell A to the maximum extent, and while supporting the sealing ring B, it is also convenient to release the supporting state with the sealing ring B in the final position. In addition, the support portion 322 extends circumferentially. The width of the support portion 322 is also particularly critical to solve the problem of insufficient supporting force after the support portion 322 becomes thinner. If the width of the support portion 322 extending in the circumferential direction is too small, the effect of supporting the sealing ring B will become poor. Therefore, in this embodiment, the thickness t1 of the support portion 322 is set to 0.1 times the thickness t2 of the support member 321: t1=0.1t2; and the width w1 of the support portion 322 extending in the circumferential direction is set to 2 times the width w2 of the support member 321: w1=2w2, so that the support portion 322 can support the sealing ring B while also meeting the maximum limited downward pressure with the inner shell C.In order to release the holding state of the support part 322 and the sealing ring B, the support part 321 is provided with a sliding part 323 that can slide along the radial direction of the head 31a, and the head 31a is provided with a limiting groove 311 that cooperates with the sliding part 323. The limiting groove 311 can limit the sliding part 323 to only slide along the radial direction of the head 31a. The sliding part 323 includes a first part 323a connected to the support part 321 and a second part 323b connected to the first part 323a. The second part 323b is limited in the limiting groove 311. In this embodiment, the first part 323a and the second part 323b are connected to form a "T" shape. The first driving part 324 is connected to the sliding part 323 and can drive the sliding part 323 to slide along the radial direction of the head 31a in the limiting groove 311, so that the support part 321 and the support part 322 can slide with the sliding part 323, thereby releasing the holding state of the support part 322 and the sealing ring B.

[0062] See also Figure 8 The support assembly 33 is arranged on the outer wall of the head 31a and is located above the anti-slip mechanism 32. The support assembly 33 includes a second driving part 331 and at least two support members 332 arranged at intervals along the circumference of the head 31a. The support members 332 can apply a supporting force to the inner wall of the inner shell C, and can release the supporting state with the inner shell C after the supporting part 322 releases the supporting state with the help of the second driving part 331. Among them, the second driving part 331 is set independently of the first driving part 324. The first driving part 324 and the second driving part 331 of this embodiment are both cylinders, and joints capable of outputting gas source or gas source and power source are respectively arranged on the head 31a, and each driving part is connected to its corresponding joint gas circuit.

[0063] In addition, the support member 332 is provided with an anti-slip portion 333 at one end close to the inner shell C for preventing the support member 332 and the inner shell C from sliding relative to each other in the supported state. The anti-slip portion 333 is at least two elastic protrusions that increase the friction coefficient between the support member 332 and the inner wall of the inner shell C, thereby increasing the supporting strength of the support member 332.

[0064] See also Figure 3 and Figure 5 The visual inspection module 34 is used to detect the installation status of the sealing ring B. The visual inspection module 34 is arranged adjacent to the press-fitting portion 31 and faces the sealing ring B. The tail portion 31b extends outward to form an extension platform 312, and the extension platform 312 is provided with a third driving portion 4, such as Figure 9-10As shown, the third driving part 4 can drive the inner housing C to rotate together with the press-fitting part so as to cooperate with the visual inspection module 34 to detect the installation state of the sealing ring B. During visual inspection, the third driving part 4 drives the inner housing C to rotate for one circle, and the visual inspection module 34 is used to perform visual inspection to ensure that the sealing ring B is installed intact during press-fitting. The third driving part 4 includes a driving source 41 and a transmission assembly 42. In this embodiment, the driving source 41 is a rotating motor, and the transmission assembly 42 adopts a belt transmission method. The transmission assembly 42 includes a driving wheel 421, a driven wheel 422 and a transmission belt 423, wherein the driving wheel 421 is arranged at the output end of the motor, the transmission wheel is connected to the press-fitting part 31 and is coaxially arranged with the press-fitting part 31, the press-fitting part 31 and the inner housing C can rotate with the driven wheel 422, and the transmission belt 423 connects the driving wheel 421 and the driven wheel 422, and can transmit the force of the driving wheel 421 to the driven wheel 422 so that it rotates with the driving wheel 421.

[0065] See also Figure 3-5 The first conveying mechanism 35 includes a first guide rail 351, a connecting member 352 and a fourth driving part 353, wherein the first guide rail 351 is arranged parallel to the axial direction of the press-fitting part 31, the connecting member 352 is arranged on the first guide rail 351 and connected to the extension platform 312 of the press-fitting part 31, the connecting member 352 is located at the outer edge of the transmission assembly 42, and the fourth driving part 353 is used to drive the press-fitting part 31 to move along the first guide rail 351 to move the inner housing C connected to the press-fitting part 31 from the initial position to the final position. The provision of the first guide rail 351 avoids the shaking of the press-fitting part 31 during press-fitting, thereby improving the stability of the shrink-fitting machine.

[0066] In addition, a second conveying mechanism 5 is also provided on the first workbench 1 of the shrink fitting machine. Fig.13 The second conveying mechanism 5 includes a second guide rail 51, a carrier 52 and a fifth driving unit 53. The second guide rail 51 is arranged along the heating station 2 and the assembly station 3, the carrier 52 is arranged on the second guide rail 51 and is used to carry the outer shell A, and the fifth driving unit 53 is connected to the carrier 52 and is used to drive the carrier 52 to move along the second guide rail 51 to convey the outer shell A from the heating station 2 to the assembly station 3.

[0067] In summary, the use process of the shrink fit assembly machine for motor housing is as follows:

[0068] A. Figure 5 As shown, the assembler places the outer shell A on the carrier 52;

[0069] B. Start the device. The carrier 52, under the action of the fifth driving part 53, transfers the outer shell A to the heating station 2 along the second guide rail 51. Fig.11 As shown;

[0070] C. Heating station 2 starts to heat the outer shell A. At the same time, the assembler places the inner shell C pre-installed with the sealing ring B on the assembly station 3. Figure 12-13 As shown;

[0071] D. When the heating station 2 heats the outer shell A to a preset temperature, the heating station 2 stops heating the outer shell A;

[0072] E. The support assembly 33 extends to support the inner shell C, and the anti-slip mechanism 32 extends to hold the sealing ring B and lift the inner shell C. At the same time, the carrier 52 transfers the heated outer shell A along the second guide rail 51 to the assembly station 3. Fig.14 As shown;

[0073] F. Fig.15 As shown, the third driving unit 4 drives the inner housing C to rotate one circle, and the visual detection module 34 detects the installation status of the sealing ring B;

[0074] G. The first conveying mechanism 35 drives the pressing part 31 to press down, and the inner shell C is installed into the outer shell A. Fig.16 As shown;

[0075] H. The anti-slip mechanism 32 is released from the dragging state, the supporting assembly 33 is released from the supporting state, and the first conveying mechanism 35 drives the pressing part 31 to rise. Fig.17 As shown;

[0076] I. Wait for the temperature of the outer shell A to drop to a safe range where it will not harm the assembler, then remove the outer shell A. Fig.18 As shown, proceed to the next round of operation.

[0077] Example 2

[0078] like Fig.19 As shown, the shrink fit machine suitable for the motor housing of this embodiment includes a first workbench 1 and a second workbench 6 arranged adjacent to the first workbench 1, wherein the first workbench 1 is the same as the first workbench 1 of the embodiment, and the second workbench 6 is used to pre-install the sealing ring B on the inner housing C.

[0079] The second workbench 6 is provided with a positioning block 61 for positioning the installation position of the inner housing C and a limit block 62 for preventing the inner housing C from rotating relative to the second workbench 6. When in use, the assembler installs the inner housing C with its bottom facing upward on the second workbench 6, and installs the sealing ring B on the annular inner step C1 of the inner housing C to complete the installation of the sealing ring B.

Claims

1. A shrink fit machine for a motor housing, comprising a first workbench (1), wherein the first workbench (1) is provided with: A heating station (2) for heating the outer shell (A); An assembly station (3) is arranged upstream of the heating station (2) and is used to install the inner shell (C) with a sealing ring (B) pre-installed on the bottom into the outer shell (A) heated by the heating station (2), wherein the sealing ring (B) protrudes from the bottom of the inner shell (C); characterized in that: The assembly station (3) comprises: The press-fitting portion (31) is connected to the inner shell (C), and comprises a head portion (31a) and a tail portion (31b) extending upward along the axial direction of the end of the head portion (31a); The anti-slip mechanism (32) is arranged on the outer wall of the head (31a) adjacent to the bottom thereof, and comprises at least two support members (321) arranged at intervals along the circumference of the head (31a), wherein: The inner shell (C) is provided with an annular inner step (C1) for arranging a sealing ring (B) at the bottom periphery thereof. The annular inner step (C1) includes a first wall surface (C11) located above and a second wall surface (C12) located below the first wall surface (C11) and connected to the first wall surface (C11). The sealing ring (B) abuts against the first wall surface (C11) and the second wall surface (C12) respectively and is exposed from the second wall surface (C12) by a height of h1. The outer edge of each of the supporting members (321) is provided with a supporting portion (322) for supporting the exposed portion of the sealing ring (B), and the supporting portion (322) can release the supporting state with the sealing ring (B) in the final position; There is a first distance k1 between the support portion (322) and the bottom of the inner shell (C), and the first distance k1 is not less than the height h2 of the second wall surface (C12) plus the height h1 of the exposed part of the sealing ring (B); The relationship between the radial length d1 of the support portion (322) exposed outside the second wall surface (C12) and the thickness D of the sealing ring (B) satisfies: 1 / 3D≤d1≤1 / 2D; The relationship between the thickness D of the sealing ring (B) and the length d2 of the first wall surface (C11) satisfies: 0.7d2≤D≤0.9d2.

2. The shrink fit machine according to claim 1, characterized in that: The relationship between the thickness t1 of the support portion (322) and the thickness t2 of the support member (321) satisfies: 0.05t2≤t1≤0.25t2; The relationship between the width w1 of the support portion (322) extending in the circumferential direction and the width w2 of the support member (321) satisfies: 1.5w2≤w1≤2.5w2.

3. The shrink fit machine according to claim 2, characterized in that: The support (321) is provided with a sliding portion (323) capable of sliding radially along the head (31a); the head (31a) is provided with a limiting groove (311) cooperating with the sliding portion (323); the limiting groove (311) can limit the sliding portion (323) to only slide radially along the head (31a); the sliding portion (323) includes a first portion (323a) connected to the support (321) and a second portion (323b) connected to the first portion (323a); the second portion (323b) is limited in the limiting groove (311).

4. The shrink fit machine according to claim 3, characterized in that: The anti-slip mechanism (32) further comprises a first driving part (324), which is connected to the sliding part (323) and can drive the sliding part (323) to slide radially along the head (31a) in the limiting groove (311), so that the supporting member (321) and the supporting part (322) can slide following the sliding part (323), thereby releasing the supporting state of the supporting part (322) and the sealing ring (B).

5. The shrink fit machine according to claim 4, characterized in that: The assembly station (3) also includes a support component (33), which is arranged on the outer wall of the head (31a) and located above the anti-slip mechanism (32). The support component (33) includes a second drive part (331) and at least two support members (332) arranged at intervals along the circumference of the head (31a). The support member (332) can apply a supporting force to the inner wall of the inner shell (C) and can release the supporting state with the inner shell (C) after the supporting state of the supporting part (322) is released by means of the second drive part (331). The second drive part (331) is independent of the first drive part (324).

6. The shrink fit machine according to claim 5, characterized in that: The support member (332) is provided with an anti-slip portion (333) at one end close to the inner shell (C) for preventing the support member (332) and the inner shell (C) from sliding relative to each other in a supported state.

7. The shrink fit machine according to any one of claims 1 to 6, characterized in that: The assembly station (3) also includes a visual inspection module (34) for detecting the installation status of the sealing ring (B), and the visual inspection module (34) is arranged adjacent to the pressing portion (31) and facing the sealing ring (B).

8. The shrink-fitting machine according to claim 7, characterized in that: The tail portion (31b) extends outward to form an extension platform (312), and a third driving portion (4) is provided on the extension platform (312). The third driving portion (4) can drive the inner shell (C) to rotate together with the press-fitting portion (31) so as to cooperate with the visual detection module (34) to detect the installation status of the sealing ring (B).

9. The shrink-fit assembly machine according to claim 8, characterized in that: The third driving unit (4) comprises a driving source (41) and a transmission assembly (42), wherein the transmission assembly (42) comprises: A driving wheel (421) is arranged at the output end of the driving source (41); A driven wheel (422) connected to the press-fitting portion (31) and coaxially arranged with the press-fitting portion (31), wherein the press-fitting portion (31) and the inner housing (C) can rotate along with the driven wheel (422); The transmission belt (423) connects the driving wheel (421) and the driven wheel (422), and can transmit the rotation force of the driving wheel (421) to the driven wheel (422) so that the driven wheel (422) rotates along with the driving wheel (421).

10. The shrink fit machine according to claim 9, characterized in that: The assembly station (3) is further provided with a first conveying mechanism (35), wherein the first conveying mechanism (35) comprises: A first guide rail (351) is arranged parallel to the axial direction of the press-fitting portion (31); a connecting member (352) disposed on the first guide rail (351) and connected to the extension platform (312) of the press-fitting portion (31), wherein the connecting member (352) is located at the outer edge of the transmission assembly (42); The fourth driving part (353) is used to drive the pressing part (31) to move along the first guide rail (351) so as to move the inner shell (C) connected to the pressing part (31) from an initial position to a final position.

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