Bearing and shaft sleeve assembling device

Abstract

The invention discloses a bearing shaft sleeve assembling device which comprises a pressing head and a product positioning tool, a product is positioned on the product positioning tool, the top end of the product is sleeved with a bearing shaft sleeve, the descending pressing head presses the bearing shaft sleeve on the product, a heating coil is arranged in the pressing head, and the heating coil heats the pressing head; the pressing head descends in stages, the first stage descends, the pressing head makes contact with the bearing shaft sleeve, and the second stage descends, and the pressing head downwards presses the bearing shaft sleeve on the product. The bearing shaft sleeve is pressed on a product after being heated by the pressing head, so that the product abrasion can be effectively avoided, and the product quality is improved; a bearing shaft sleeve with a smaller inner diameter can be adopted, so that the tightness of the bearing shaft sleeve on a product is improved; when two bearing shaft sleeves are pressed at the same end of a product, the tightness degree of matching between the second bearing shaft sleeve and the product is improved under the condition that the first bearing shaft sleeve does not abrade the product or abrades the product slightly.

Description

Technical Field

[0001] This invention relates to product assembly equipment, specifically to bearing bushing assembly equipment. Background Technology

[0002] Bearings need to be installed on the drive shaft, and these bearings fit into the bearing mounting holes in the housing. The drive shaft is connected to the motor, and rotates under the motor's drive. Before installing the bearings on the drive shaft, bearing sleeves need to be installed. The bearing sleeves are pressed onto the drive shaft using a press-fit device, and the bearing sleeves and drive shaft have an interference fit. Because the bearing sleeves are press-fitted onto the drive shaft, they are prone to wearing down the drive shaft, especially when two bearing sleeves are press-fitted onto the same end of the drive shaft. The bearing sleeve pressed onto the drive shaft first wears down the drive shaft surface, resulting in a loose fit when the subsequent bearing sleeve is pressed onto the drive shaft. Summary of the Invention

[0003] The technical problem solved by this invention is that when a bearing bush is press-fitted onto a drive shaft, the bearing bush is prone to wear on the drive shaft. This is especially true when two bearing bushes are press-fitted onto the same end of the drive shaft, the latter bearing bush is not tightly fitted to the drive shaft due to the wear of the former bearing bush on the drive shaft.

[0004] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a bearing bushing assembly device, comprising a lifting and lowering pressure head, and a product positioning fixture located below the pressure head, wherein the product is positioned on the product positioning fixture, the bearing bushing is fitted onto the top of the product, the descending pressure head presses the bearing bushing onto the product, and a heating coil is provided inside the pressure head to heat the pressure head; the pressure head descends in stages, in the first stage when the pressure head contacts the bearing bushing, and in the second stage when the pressure head presses the bearing bushing onto the product.

[0005] According to the above technical solution, the product (drive shaft) is positioned on a product positioning fixture. The worker places the bearing sleeve on the top of the drive shaft (the top of the drive shaft is tapered). The pressure head descends in the first stage, contacting the bearing sleeve. A heating coil heats the pressure head, which in turn heats the bearing sleeve. During the heating process, the bearing sleeve undergoes deformation in both radial and circumferential directions. For radial deformation, the inner diameter expands due to thermal expansion of the metal material during heating. For circumferential deformation, the metal material deforms upon heating, increasing the circumferential length of the ring and correspondingly expanding the inner diameter. This expanded inner diameter of the bearing sleeve facilitates its subsequent successful pressing onto the product. In the second stage, the pressure head descends, pressing the bearing sleeve onto the product. After cooling, the bearing sleeve tightens onto the product.

[0006] Since the process of pressing the first bearing bushing causes little or no wear to the product, the second bearing bushing can fit tightly with the product after pressing.

[0007] The pressure head includes a pressure head body and a pressing component. The pressure head body has a pressing component mounting groove, and the bottom of the pressing component mounting groove has a clearance hole. The pressing component fits into the pressing component mounting groove from bottom to top. The pressing component is annular, and the inner ring of the pressing component is aligned vertically with the clearance hole. The heating coil fits into the pressing component mounting groove and is located between the outer ring of the pressing component and the inner wall of the pressing component mounting groove. The pressure head body has a through hole for the heating coil wire to pass through. The heating coil wire is connected to a power source. When powered by the power source, the heating coil heats up, thus heating the pressing component.

[0008] The heating coil is completely concealed within the mounting groove of the pressing component. The pressing component protrudes downwards from the mounting groove, and its top is connected to the pressure head body via a threaded connector. The outer wall of the pressing component is sloped, pressing the heating coil firmly into the mounting groove. During installation, the heating coil is first installed in the mounting groove. Then, the pressing component is assembled from bottom to top within the mounting groove. The threaded connector fits into the connecting hole of the pressure head body and connects to the threaded hole at the top of the pressing component. The threaded connector ensures that the outer wall of the pressing component presses the heating coil firmly into the mounting groove, facilitating effective heat conduction and heating of the pressing component.

[0009] The main body of the pressure head is mounted on the lifting module, which is connected to the lifting rod. The lifting rod is connected to the lead screw mechanism, which is mounted on the bracket. The motor of the lead screw mechanism is connected to the main control unit. Under the control of the main control unit, the motor rotates in stages, realizing the first stage and the second stage of the pressure head's descent.

[0010] The lifting module is equipped with a guide rod, which engages with a guide sleeve on the bracket. A top plate is located at the top of the guide rod. As an improvement, the top plate is equipped with a sensor contact, and a contact sensor is mounted on the bracket. When the pressing component presses the bearing sleeve into place, the sensor contact engages with the contact sensor, which then sends a signal back to the main control unit. Under the control of the main control unit, the motor of the lead screw mechanism stops operating, ensuring the accuracy of the bearing sleeve's pressing position.

[0011] The product positioning fixture is equipped with a detachable product lifting component. When pressing the first bearing sleeve, the product is positioned on the product lifting component. When pressing the second bearing sleeve, the product is directly positioned on the product positioning fixture. The product lifting component raises the product by the height of one bearing sleeve. Since the downward stroke of the press head is fixed, when pressing two bearing sleeves onto the same product, the product needs to be lowered by the height of one bearing sleeve when pressing the second bearing sleeve. The product of this invention is a drive shaft. Both the product positioning fixture and the product lifting component are provided with drive shaft positioning holes. The bottom of the product lifting component has a positioning protrusion that mates with the drive shaft positioning hole on the product positioning fixture. When the product lifting component is fitted onto the product positioning fixture, the positioning protrusion mates with the drive shaft positioning hole on the product positioning fixture.

[0012] The present invention has the following technical effects: First, heating the bearing sleeve before pressing it onto the product can effectively prevent product wear and improve product quality; Second, heating the bearing sleeve before pressing it onto the product allows for the use of bearing sleeves with smaller inner diameters, thereby improving the tightness of the bearing sleeve on the product; Third, when two bearing sleeves are pressed onto the same end of the product, if the first bearing sleeve causes little or no wear to the product, it is beneficial to improve the tightness of the fit between the second bearing sleeve and the product. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the bearing bushing assembly device, in which the product positioning fixture is not shown;

[0014] Figure 2 This is a schematic diagram showing the bearing bushing assembly from below.

[0015] Figure 3 for Figure 2 A partial exploded view;

[0016] Figure 4 A schematic diagram showing the bearing bushing assembly from the rear.

[0017] Figure 5 This is a schematic diagram of the bearing bushing assembly device. The product positioning fixture is not shown.

[0018] Explanation of symbols in the diagram:

[0019] 10. Press head; 11. Heating coil; 12. Press head body; 121. Pressing component mounting groove; 122. Clearance hole; 123. Connecting hole; 13. Pressing component; 14. Lifting module; 15. Lifting rod; 16. Screw mechanism; 161. Motor; 17. Guide rod; 171. Top plate; 172. Sensor contact; 18. Contact sensor;

[0020] 20. Bracket;

[0021] 90. Product; 91. Bearing bushing. Detailed Implementation

[0022] Combination Figure 1 , Figure 2 , Figure 5 A bearing bushing assembly device includes a lifting pressure head 10 and a product positioning fixture located below the pressure head. A product 90 is positioned on the product positioning fixture, and a bearing bushing 91 is fitted onto the top of the product. The descending pressure head presses the bearing bushing onto the product. A heating coil 11 is provided inside the pressure head to heat the pressure head. The pressure head descends in stages. In the first stage, the pressure head contacts the bearing bushing. In the second stage, the pressure head presses the bearing bushing onto the product.

[0023] Combination Figure 2 , Figure 3 The pressure head 10 includes a pressure head body 12 and a pressing component 13. The pressure head body is provided with a pressing component mounting groove 121. The bottom of the pressing component mounting groove is provided with a clearance hole 122. The pressing component 13 is fitted into the pressing component mounting groove from bottom to top. The pressing component is annular. The inner ring of the pressing component is aligned vertically with the clearance hole. The heating coil 11 is fitted into the pressing component mounting groove and is located between the outer ring of the pressing component and the inner wall of the pressing component mounting groove. The pressure head body 12 is provided with a through hole for the heating coil wire to pass through.

[0024] Combination Figures 1 to 3 The heating coil 11 is completely concealed within the mounting groove 121 of the pressing component. The pressing component 13 protrudes downwards from the mounting groove, and its top is connected to the pressure head body 12 via a threaded connector. The outer wall of the pressing component has an incline, which presses the heating coil tightly into the mounting groove. During installation, the heating coil 11 is first installed in the mounting groove 121. Then, the pressing component 13 is assembled from bottom to top into the mounting groove. The threaded connector fits into the connecting hole 123 of the pressure head body 12 and connects to the threaded hole at the top of the pressing component 13. Under the action of the threaded connector, the outer wall of the pressing component 13 presses the heating coil tightly into the mounting groove 121, facilitating effective heat conduction by the heating coil 11 and effectively heating the pressing component.

[0025] like Figure 1 The pressure head body 12 is installed on the lifting module 14. The lifting module is connected to the lifting rod 15. The lifting rod is connected to the lead screw mechanism 16. The lead screw mechanism is installed on the bracket 20.

[0026] like Figure 1 , Figure 4The lifting module 14 is provided with a guide rod 17, which cooperates with the guide sleeve on the bracket 20. The top of the guide rod is provided with a top plate 171, and the top plate is provided with a sensor contact 172. The bracket is provided with a contact sensor 18. When the pressing part 13 presses the bearing sleeve 91 into place, the sensor contact 172 contacts the contact sensor 18.

[0027] The product positioning fixture is equipped with a detachable product lifting component. When pressing the first bearing bushing, the product is positioned on the product lifting component. When pressing the second bearing bushing, the product is directly positioned on the product positioning fixture.

[0028] refer to Figure 5 In actual operation, the heating coil 11 is connected to a power source. Powered by the power source, the heating coil heats up, thus heating the pressing component 13. The product is positioned on a product positioning fixture. The worker places the bearing sleeve 91 on top of the product. The pressing head 10 descends in the first stage, contacting the bearing sleeve. The heating coil heats the pressing component 13, and the pressing component heats the bearing sleeve 91. During the heating process, the bearing sleeve undergoes deformation in both radial and circumferential directions. For radial deformation, the inner diameter expands due to thermal expansion after the metal material is heated. For circumferential deformation, the metal material deforms after heating, increasing the circumferential length of the ring and correspondingly expanding the inner diameter. The expanded inner diameter of the bearing sleeve provides favorable conditions for subsequent successful pressing onto the product. The pressing head 10 descends in the second stage, pressing the bearing sleeve 91 onto the product. After cooling, the bearing sleeve tightens onto the product.

[0029] The product raising component raises the product by the height of one bearing sleeve. Since the downward stroke of the pressure head 10 is fixed, when pressing two bearing sleeves 91 onto the same product, the product needs to be lowered by the height of one bearing sleeve when pressing the second bearing sleeve. The product of this invention is a drive shaft. Both the product positioning fixture and the product raising component are equipped with drive shaft positioning holes. The bottom of the product raising component has a positioning protrusion that mates with the drive shaft positioning hole on the product positioning fixture. When the product raising component is fitted onto the product positioning fixture, the positioning protrusion mates with the drive shaft positioning hole of the product positioning fixture. When pressing the first bearing sleeve, the product is positioned on the product raising component, and the product raising component is positioned on the product positioning fixture. When pressing the second bearing sleeve, the product raising component is removed, and the product is directly positioned on the product positioning fixture.

[0030] Since the process of pressing the first bearing bushing causes little or no wear to the product, the second bearing bushing can fit tightly with the product after pressing.

[0031] The lifting and lowering of the pressure head 10 is driven by the lead screw mechanism 16. The motor 161 of the lead screw mechanism is connected to the main control unit. Under the control of the main control unit, the motor rotates in stages to achieve the first stage and the second stage of the pressure head's descent. The addition of a contact sensor 18 on the bracket 20 is an improvement of this invention, aimed at improving the accuracy of the pressing process. When the pressing member 13 presses the bearing sleeve 91 into place, the sensor contact member 172 contacts the contact sensor 18. The contact sensor sends a signal back to the main control unit. Under the control of the main control unit, the motor 161 of the lead screw mechanism stops operating to ensure the accuracy of the bearing sleeve's pressing position.

[0032] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A bearing bushing assembly device, comprising a lifting pressure head (10), and a product positioning fixture located below the pressure head, wherein a product (90) is positioned on the product positioning fixture, a bearing bushing (91) is fitted onto the top of the product, and the descending pressure head presses the bearing bushing onto the product, characterized in that: The pressure head is equipped with a heating coil (11) to heat the pressure head; the pressure head descends in stages. In the first stage, the pressure head contacts the bearing bushing, and in the second stage, the pressure head presses the bearing bushing down onto the product.

2. The bearing bushing assembly device as described in claim 1, characterized in that: The pressure head (10) includes a pressure head body (12) and a pressing component (13). The pressure head body is provided with a pressing component mounting groove (121). The bottom of the pressing component mounting groove is provided with a clearance hole (122). The pressing component (13) is fitted in the pressing component mounting groove from bottom to top. The pressing component is annular. The inner ring of the pressing component is aligned with the clearance hole. The heating coil (11) is fitted in the pressing component mounting groove and is located between the outer ring of the pressing component and the inner wall of the pressing component mounting groove. The pressure head body (12) is provided with a through hole for the heating coil wire to pass through.

3. The bearing bushing assembly device as described in claim 2, characterized in that: The heating coil (11) is completely hidden in the pressing part mounting groove (121), the pressing part (13) protrudes downward from the pressing part mounting groove, the top of the pressing part is connected to the pressure head body (12) through a threaded connector, the outer side wall of the pressing part has an inclination, and the outer side wall of the pressing part presses the heating coil in the pressing part mounting groove.

4. The bearing bushing assembly device as described in claim 2, characterized in that: The pressure head body (12) is installed on the lifting module (14), the lifting module is connected to the lifting rod (15), the lifting rod is connected to the screw mechanism (16), and the screw mechanism is installed on the bracket (20).

5. The bearing bushing assembly device as described in claim 4, characterized in that: The lifting module (14) is provided with a guide rod (17), which cooperates with the guide sleeve on the bracket (20). The top of the guide rod is provided with a top plate (171), and the top plate is provided with a sensor contact (172). The bracket is provided with a contact sensor (18). When the pressing part (13) presses the bearing bush (91) into place, the sensor contact (172) contacts the contact sensor (18).

6. The bearing bushing assembly device as described in claim 5, characterized in that: The product positioning fixture is equipped with a detachable product lifting component. When pressing the first bearing bushing, the product is positioned on the product lifting component. When pressing the second bearing bushing, the product is directly positioned on the product positioning fixture.

Images