Thermal isolating coupling for a lubricant testing machine

Abstract

This invention discloses a heat-insulating coupling clutch for a lubricant testing machine, comprising a clamping bushing, an elastic tapered sleeve, a cross slider, a transmission key shaft, a connecting bushing, a spring, a connecting key, a locking screw, and a positioning screw. The elastic tapered sleeve is fitted onto the positioning shaft. One end of the clamping bushing has a tapered inner hole that mates with the elastic tapered sleeve, and the other end has a fixing hole. The locking screw passes through the fixing hole and is screwed to the positioning shaft. One end of the connecting bushing is connected to the motor spindle, and the other end has a connecting hole. The spring is placed horizontally in the connecting hole. The other end of the connecting bushing has a first keyway on its side wall, and the transmission key shaft has a second keyway in its middle. One end of the transmission key shaft extends into the connecting hole so that the second keyway aligns with the first keyway for the insertion of the connecting key. The positioning screw positions the connecting key. The cross slider is made of heat-insulating material and has grooves on both sides. The other end of the clamping bushing and the transmission key shaft has a key that mates with the grooves. This invention is easy to assemble and disassemble and has a heat-insulating function.

Description

Technical Field

[0001] This invention belongs to the field of coupling technology, and specifically relates to a heat-insulating coupling clutch for a lubricant testing machine. Background Technology

[0002] A rolling bearing lubricant effective life testing machine (hereinafter referred to as the testing machine) generally refers to a rolling bearing lubricant and grease testing machine, which is a testing device used to test the effective life of rolling bearing lubricants and greases. Figure 1 As shown, its structure includes a testing head 1 and a drive motor 2. The testing head is equipped with a testing bearing and a positioning shaft 11. The testing bearing is sleeved and fixed on the positioning shaft and located inside the testing head. The drive motor drives the positioning shaft to rotate during the test to provide circumferential torque to the testing bearing. The positioning shaft is connected to the motor spindle of the drive motor through a coupling. However, using existing couplings has the following disadvantages:

[0003] 1. Existing couplings are mostly made of aluminum or ordinary steel, which do not have heat insulation properties. The test head is equipped with a heater to heat and keep the test bearing warm. The heat from the heater will be conducted to the drive motor through the positioning shaft, which will affect the operation of the drive motor. Therefore, it is necessary to install a fan and condenser in the drive motor to cool it down. Installing cooling mechanisms such as fans and condensers will increase costs.

[0004] 2. Existing locking methods for connecting couplings to shafts (positioning shafts or motor spindles) generally fall into two categories. One involves radially opening multiple threaded holes on the coupling, with multiple screws threaded into these holes to radially push the shaft, thus locking it in place. The other involves axially opening a through-groove on the coupling, with bolt head holes and threaded holes on either side of the groove. Bolts are sequentially threaded through these holes and into the groove to achieve locking, as illustrated in patent publication CN217898573U. Neither of these locking methods is convenient for disassembly and assembly, making it difficult to disconnect the positioning shaft from the motor spindle. Replacing test bearings and repairing the internal mechanisms of the test head are also inconvenient. Furthermore, prolonged use and frequent disassembly and assembly can easily damage the threads of the screws and bolts, affecting the coupling's service life. Summary of the Invention

[0005] The purpose of this invention is to provide a heat-insulating coupling clutch for a lubricant testing machine, solving the problems of existing couplings being unable to insulate heat and being inconvenient to disassemble and assemble.

[0006] To achieve the above objectives, the solution of the present invention is: a heat-insulating coupling clutch for a lubricant testing machine, which relates to a lubricant testing machine, the lubricant testing machine including a horizontally rotating testing head and an axially moving drive motor, the testing head having a horizontally positioned positioning shaft, the drive motor having a motor spindle, and the positioning shaft being axially connected to the motor spindle of the drive motor;

[0007] The heat-insulating coupling clutch includes a clamping bushing, an elastic tapered sleeve, a cross slider, a transmission key shaft, a connecting bushing, a spring, a connecting key, a locking screw, and a positioning screw. The elastic tapered sleeve is fitted onto the positioning shaft. One end of the clamping bushing has a tapered inner hole that mates with the elastic tapered sleeve, and the other end has a fixing hole that communicates with the tapered inner hole. When one end of the clamping bushing is fitted onto the elastic tapered sleeve, the locking screw passes through the fixing hole and is threadedly connected to the positioning shaft, causing the elastic tapered sleeve to clamp the positioning shaft.

[0008] One end of the connecting bushing is connected to the motor spindle, and the other end has a connecting hole. The spring is placed horizontally in the connecting hole. The other end of the connecting bushing has a first keyway radially opening on its side wall, which communicates with the connecting hole. The middle part of the transmission convex key shaft has a second keyway. When one end of the transmission convex key shaft is inserted into the connecting hole to compress the spring, the second keyway aligns with the first keyway for the connecting key to be inserted. The other end of the transmission convex key shaft has a mounting hole axially opening at its center, which communicates with the second keyway. The positioning screw is threaded into the mounting hole. The connecting key has a V-groove on the side aligned with the positioning screw, and the end of the positioning screw is engaged in the V-groove.

[0009] The cross slider is made of heat-insulating material, and the two sides of the cross slider are provided with grooves that intersect in a cross shape. The other end of the clamping bushing and the transmission key shaft are both provided with a key that mates with the groove.

[0010] Furthermore, the sidewall of the elastic cone sleeve is provided with an axially penetrating slit.

[0011] Furthermore, a fixing hole is provided at the center of the other end of the clamping bushing, and an internal thread is provided at the center of one end of the positioning shaft. The locking screw passes through the fixing hole and is threadedly connected to the internal thread. Two protruding keys are axially protruding on both sides of the fixing hole at the other end of the clamping bushing.

[0012] Furthermore, the center of the cross slider has a through hole, which provides clearance for the head of the locking screw.

[0013] Furthermore, one end of the motor spindle is provided with a chuck, which clamps and fixes one end of the connecting bushing.

[0014] Furthermore, the two side walls of one end of the connecting bushing are provided with first keyways, and the second keyway radially penetrates the middle of the transmission key shaft. When the second keyway is aligned with the two first keyways, the connecting key is inserted into the second keyway and the two first keyways.

[0015] Furthermore, the lubricant testing machine also includes a base and a motor base plate. The base is provided with a head plate for mounting the testing head. The head plate has a rotation center on the base and rotates relative to the base through the rotation center. The base is also provided with an axially sliding motor base plate for mounting the drive motor.

[0016] Furthermore, it also includes a supporting mechanism. The bottom of the drive motor is provided with a motor base. The supporting mechanism includes an elongated groove axially arranged on the base plate of the motor base, a sliding key protruding on the base, and a positioning key protruding on the bottom of the motor base. When the base plate of the motor base slides axially on the base, the sliding key slides in the elongated groove. When the motor base is installed on the base plate of the motor base, the positioning key is inserted into the elongated groove accordingly.

[0017] Furthermore, the lubricant testing machine also includes an adjusting bolt, and the motor base plate has a strip hole along the axial direction. The adjusting bolt passes through the strip hole and is threadedly connected to the base to lock the motor base plate.

[0018] Furthermore, a hand-cranked drive device is provided on one side of the motor base plate along the axial direction. The hand-cranked drive device is fixed on one side of the base along the axial direction and is drivenly connected to the motor base plate. The hand-cranked drive device is provided with a handle, and rotating the handle in the circumferential direction drives the motor base plate to move axially.

[0019] After adopting the above solution, the beneficial effects of the present invention are as follows:

[0020] 1. The present invention uses a cross slider made of heat-insulating material. The cross slider is set between the clamping bushing and the transmission key shaft to isolate heat and prevent the positioning shaft from transferring heat to the motor main shaft and affecting the operation of the drive motor. It also eliminates the need for a fan or condenser to cool down, thus reducing costs.

[0021] 2. This invention uses an elastic conical sleeve and a locking screw to lock the positioning shaft and the clamping sleeve. The outer circumference of the elastic conical sleeve is conical, and the inner circumference is cylindrical. It can be fitted onto the positioning shaft. Then, the clamping sleeve is fitted onto the elastic conical sleeve. The locking screw passes through the fixing hole at the center of the other end of the clamping sleeve and screws it onto the positioning shaft, which can axially lock the elastic conical sleeve and the clamping sleeve. At the same time, the elastic conical sleeve is elastic, and while the locking screw is locking, it will clamp the positioning shaft and the clamping sleeve, thereby circumferentially locking the positioning shaft, making the positioning shaft and the clamping sleeve fit tightly, and making the rotation of the positioning shaft more stable. The locking screw of this invention locks the positioning shaft axially. When the motor drives the positioning shaft to rotate circumferentially, the wear of the locking screw is minimal, and the clamping sleeve and the elastic conical sleeve can be removed simply by removing the locking screw, which is very convenient for disassembly and assembly.

[0022] The motor spindle is connected to one end of the connecting sleeve. When one end of the transmission key shaft is inserted into the connecting hole inside the other end of the connecting sleeve and the spring is compressed, the second keyway and the first keyway are aligned. The connecting key is then inserted into the first and second keyways, and the spring remains compressed, abutting against the transmission key shaft. Then, the positioning screw is threaded into the mounting hole, so that the end of the positioning screw is engaged in the V-groove, allowing for quick installation of the transmission key shaft. Finally, the cross slider is placed between the clamping sleeve and the transmission key shaft, and the axial movement of the drive motor causes the key to engage with the groove, completing the installation of the entire heat-insulating coupling clutch. The cross slider is a wear part that needs frequent replacement. The cross slider can be replaced by separating the transmission key shaft and the cross slider through the axial movement of the drive motor, making replacement very convenient. The replacement of the clamping sleeve and the transmission key shaft is also very convenient. The disassembly and assembly of the clamping sleeve have been explained above. When replacing the transmission key shaft, simply remove the connecting key, and the spring will return to its original position, automatically ejecting the transmission key shaft for replacement. Disassembly and assembly are convenient, quick, and easy to operate.

[0023] 3. Due to the large axial load and significant axial displacement of the positioning shaft in the lubricant testing machine, prolonged operation can cause poor fit and uneven wear at the connection between the positioning shaft and the motor spindle. This invention incorporates a spring between the transmission key shaft and the connecting sleeve. When the positioning shaft undergoes axial displacement, the transmission key shaft pushes against the spring, causing the spring to extend and retract, thus automatically compensating for the axial displacement of the positioning shaft and maintaining a good fit. Furthermore, the spring provides preload, making the force at the connection between the positioning shaft and the motor spindle more uniform, reducing vibration, and consequently, resulting in more even wear and reduced wear.

[0024] 4. The end of the positioning screw of the present invention is inserted into the V-groove. The cooperation between the positioning screw and the V-groove can not only abut against the positioning key, but also restrict the up and down movement of the positioning key, preventing the connector from coming out of the first keyway and the second keyway.

[0025] 5. The cross slider has grooves on both sides, which cooperate with the clamping bushing and the key at the other end of the transmission key shaft. Axial movement of the drive motor can separate the transmission key shaft and the cross slider, thereby disconnecting the connection between the positioning shaft and the motor spindle. Then, the test head can be rotated to replace the test bearing inside one end of the test head or to repair the internal mechanism of the test head. After completion, resetting the test head and the drive motor will allow the key of the transmission key shaft to cooperate with the groove of the cross slider, thus reconnecting the positioning shaft and the motor spindle. The positioning shaft and the motor spindle can be quickly engaged and disengaged without removing the entire heat-insulating coupling, which provides convenience for maintenance and replacement work. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a lubricant testing machine;

[0027] Figure 2 This is a partial cross-sectional view of a heat-insulating coupling clutch according to an embodiment of the present invention;

[0028] Figure 3 This is a perspective view of a heat-insulating coupling clutch according to an embodiment of the present invention;

[0029] Figure 4 This is an exploded view of a heat-insulating coupling clutch according to an embodiment of the present invention;

[0030] Figure 5 This is a front view of the cross slider of the present invention;

[0031] Figure 6 This is a side view of the cross slider of the present invention;

[0032] Figure 7 This is a partial cross-sectional view of the drive motor of the present invention;

[0033] Figure 8 This is a cross-sectional view of a heat-insulating coupling clutch according to another embodiment of the present invention;

[0034] Figure 9 This is an exploded view of a heat-insulating coupling clutch according to another embodiment of the present invention.

[0035] Label Explanation:

[0036] 1. Test head; 11. Positioning shaft; 2. Drive motor; 21. Motor spindle; 211. Chuck; 212. Fourth keyway; 22. Rotation center; 23. Long slot; 24. Positioning key; 25. Motor base; 3. Base; 31. Test head base plate; 32. Motor base plate; 321. Strip hole; 322. Adjusting bolt; 323. Sliding key; 33. Hand crank drive device; 331. Handle; 332. Screw; 4. Clamping bushing; 41. Tapered inner hole; 42. Fixing hole; 43. Raised key; 5. Elastic tapered sleeve; 51. Slit; 6. Cross slider; 61. Groove; 62. Through hole; 7. Transmission raised key shaft; 71. Second keyway; 72. Mounting hole; 8. Connecting bushing; 81. Spring; 82. Connecting key; 821. V-groove; 83. First keyway; 84. Connecting hole; 85. Linkage hole; 86. Third keyway; 87. Fixing key; 88. Set screw; 89. Set screw hole; 9. Locking screw; 10. Positioning screw. Detailed Implementation

[0037] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1 As shown, this invention provides a heat-insulating coupling clutch for a lubricant testing machine. The lubricant testing machine includes a testing head 1, a drive motor 2, and a base 3. The testing head 1 has a horizontally arranged positioning shaft 11, and the drive motor 2 has a motor spindle 21. A testing bearing (not shown) is sleeved and fixed on the positioning shaft 11. The positioning shaft 11 is axially connected to and driven to rotate axially by the motor spindle 21. The base 3 has a head base plate 31 for mounting the testing head 1, and a motor base plate 32 for axially sliding mounting the drive motor 2. The head base plate 31 has a rotation center on the base 3. The center 22 rotates horizontally relative to the base through the rotation center 22. The test head 1 is fixed on the head base plate 31 and can rotate with the head base plate 31. The drive motor 2 is fixed on the motor base plate 32 and can move axially with the motor base plate 32. When it is necessary to replace the test bearing inside one end of the test head 1 or to repair the internal mechanism of the test head 1, it is necessary to disconnect the connection between the positioning shaft 11 and the motor main shaft 21, and then move the drive motor 2 axially away from the test head 1. Then rotate the test head 1 so that there is enough operating space around the end of the positioning shaft 11 connected to the motor main shaft 21, which is convenient for the staff to replace the test bearing or carry out the repair.

[0039] like Figure 1-7As shown, the heat-insulating coupling clutch includes a clamping bushing 4, an elastic cone sleeve 5, a cross slider 6, a transmission key shaft 7, a connecting bushing 8, a spring 81, a connecting key 82, a locking screw 9, and a positioning screw 10. The outer circumference of the elastic cone sleeve 5 is a tapered surface, and the inner circumference is a cylindrical surface, which can be fitted onto the positioning rotating shaft 11. One end of the clamping bushing 4 has a tapered inner hole 41 that mates with the elastic cone sleeve 5. The diameter of the tapered inner hole 41 gradually decreases from one end of the clamping bushing 4 to the other end. The center of the other end of the clamping bushing 4 has a connection to the tapered inner hole 41. The fixing hole 42 is through. During installation, first, the elastic cone sleeve 5 is placed on the positioning shaft 11, then one end of the clamping shaft sleeve 4 is placed on the elastic cone sleeve 5, and finally the locking screw 9 is threaded through the fixing hole 42 and connected to the positioning shaft 11. The locking screw 9 can axially lock the clamping shaft sleeve 4 and the elastic cone sleeve 5. The material of the elastic cone sleeve 5 is preferably heat-treated metal, which is elastic. When the locking screw 9 is locked, it will expand and tighten, thereby clamping the positioning shaft 11 and the clamping shaft sleeve 4, circumferentially locking the positioning shaft 11, and preventing the positioning shaft 11 from rotating relative to the clamping shaft sleeve 4.

[0040] One end of the connecting bushing 8 is connected to the motor spindle 21, and the other end has a connecting hole 84. The spring 81 is horizontally placed in the connecting hole 84. The other end of the connecting bushing 8 has a first keyway 83 radially opening on its side wall, communicating with the connecting hole 84. The transmission key shaft 7 has a second keyway 71 in its middle. The other end of the transmission key shaft 7 has a mounting hole 72 axially opening at its center, communicating with the second keyway 71. The positioning screw 10 is threaded into the mounting hole 72. The connecting key 82 has a V-shaped section on the side aligned with the positioning screw 10. The end of the positioning screw 10 is inserted into the V-groove 821. During installation, one end of the transmission key shaft 7 is inserted into the connecting hole 84 to push and compress the spring 81 until the second keyway 71 is aligned with the first keyway 83. Then, the connecting key 82 is inserted into the first keyway 83 and the second keyway 71. The spring 81 is kept compressed and abuts against the transmission key shaft 7. Finally, the positioning screw 10 is threaded into the mounting hole 72, and the end of the positioning screw 10 is inserted into the V-groove 821. The transmission key shaft 7 can then be installed quickly and easily.

[0041] Furthermore, when the positioning shaft 11 and the motor spindle 21 are connected, if the positioning shaft 11 is axially displaced, the transmission key shaft 7 will axially push against the spring 81, causing the spring 81 to extend and retract, thereby automatically compensating for the axial displacement of the positioning shaft 11 and maintaining a good fit. When the transmission key shaft 7 axially pushes against the spring 81, it will drive the connecting key 82 to move axially within the first keyway 83. Therefore, the length of the first keyway 83 must be greater than the width of the connecting key 82 to provide space for the axial movement of the connecting key 82. The width of the connecting key 82 can be the same as the width of the second keyway 72, which facilitates the positioning screw 10 to position and lock the connecting key 82. In addition, the spring 81 can also provide preload, making the force at the connection between the positioning shaft 11 and the motor spindle 21 more uniform, thereby maintaining a good fit at the connection and reducing vibration, and avoiding uneven wear.

[0042] The cross slider 6 has cross-shaped grooves 61 on both sides. The other end of the clamping bushing 4 and the transmission key shaft 7 is provided with a key 43 that mates with the grooves 61. After the clamping bushing 4 and the transmission key shaft 7 are installed, the cross slider 6 is placed between the clamping bushing 4 and the transmission key shaft 7. The axial movement drive motor 2 makes the key 43 mate with the grooves 61 to complete the installation of the entire heat-insulating coupling clutch. It should be noted that a small gap needs to be left between the clamping bushing 4 and the transmission key shaft 7 and the cross slider 6 to allow space for the thermal expansion and contraction of the cross slider 6 and the wear and displacement of the positioning shaft 11.

[0043] The cross slider 6 is made of heat-insulating material, which can isolate the heat transfer between the positioning shaft 11 and the drive motor 2, and prevent the heat generated by the test head 1 from being conducted to the positioning shaft 11, so as not to affect the operation of the drive motor 2. The drive motor 2 does not need to be equipped with a fan and condenser for cooling, thus reducing costs.

[0044] The heat-insulated coupling clutch of this invention facilitates the engagement and disengagement of the test head 1 and the drive motor 2. Moving the drive motor 2 outward axially separates the transmission key shaft 7 and the cross slider 6, thereby disconnecting the positioning shaft 11 and the motor main shaft 21. Then, the test head 1 can be rotated to replace the test bearing inside one end of the test head 1 or to repair the internal mechanism of the test head 1. After completion, resetting the test head 1 and the drive motor 2 allows the key 43 of the transmission key shaft 7 to engage with the groove 61 of the cross slider 6, thus reconnecting the positioning shaft 11 and the motor main shaft 21. The positioning shaft 11 and the motor main shaft 21 can be quickly engaged and disengaged without removing the entire heat-insulated coupling, providing convenience for maintenance and replacement work.

[0045] Since the grooves 61 on both sides of the cross slider 6 engage with the clamping bushing 4 and the key 43 of the transmission key shaft 7 respectively to achieve disengagement, the cross slider 6 is a wear part that needs to be replaced frequently. The cross slider 6 can be removed for replacement by moving the drive motor 2 outward axially to disconnect the connection between the motor main shaft 21 and the positioning shaft 11. The clamping bushing 4 and the transmission key 43 can also be replaced quickly. After moving the drive motor 2 outward axially, the clamping bushing 4 can be removed for replacement by removing the locking screw 9. After removing the connecting key 82, the spring 81 will return to its original position and automatically pop out the transmission key shaft 7 for replacement. Therefore, the present invention makes it very quick and convenient to disassemble and replace the cross slider 6, the clamping chuck 211 and the transmission key shaft 7.

[0046] Key references Figure 2 In one embodiment, one end of the motor spindle 21 is provided with a chuck 211, which clamps and fixes one end of the connecting bushing 8, so that the connecting bushing 8 can be connected and fixed to the motor spindle 21. The chuck 211 is preferably a spring 81 chuck 211, which is convenient and quick to disassemble and install and is secure.

[0047] Key references Figure 8 and Figure 9 In another embodiment, a connecting hole 85 is formed inside one end of the connecting sleeve 8, and a third keyway 86 is formed on the side wall of the connecting hole 85. A fourth keyway 212 is formed at one end of the motor spindle 21. A fixing key 87 is placed in the fourth keyway 212. When one end of the connecting sleeve 8 is fitted onto one end of the motor spindle 21, the fixing key 87 slides into the third keyway 86. A set screw hole 89 communicating with the third keyway 86 is radially formed at one end of the connecting sleeve 8. A set screw 88 passes through the set screw hole 89 and abuts against the fixing key 87, positioning the fixing key 87 and completing the installation of the connecting sleeve 8 and the motor spindle 21. The fixing key 87 is preferably a flat key, which simplifies the processing of the third keyway 86 and the fourth keyway 212, reduces costs, and is applicable not only to the drive motor 2 of this invention but also to other ordinary motors.

[0048] Key references Figure 2 and Figure 4 The connecting sleeve 8 has two side walls at one end with first keyways 83 and second keyways 71 radially penetrating the middle of the transmission key shaft 7. When the second keyway 71 is aligned with the two first keyways 83, the connecting key 82 is inserted into the second keyway 71 and the two first keyways 83. This arrangement makes the connection between the transmission key shaft 7 and the connecting shaft more secure and stable. The engagement of the positioning screw 10 and the V-groove 821 can restrict the connecting piece 82 from moving up and down and disengaging from the first keyway 83 and the second keyway 71.

[0049] Key references Figure 2 and Figure 4The side wall of the elastic cone sleeve 5 is provided with an axial through slit 51. The slit 51 is provided to provide space for the elastic cone sleeve 5 to deform, so that the elastic cone sleeve 5 can deform and tightly hug the bushing 4 and the positioning shaft 11. The elastic cone sleeve 5 can also be easily fitted onto the positioning shaft 11 through the slit 51.

[0050] Key references Figure 2 The cross slider 6 has a through hole 62 at its center. If the head of the locking screw 9 for locking the bushing 4 is long, the through hole 62 can accommodate the head of the locking screw 9, thus saving material. Therefore, the key reference is... Figure 5 and Figure 6 The cross slider 6 has grooves 61 on both sides of the through hole 62. The two grooves 61 on one side of the cross slider 6 are symmetrical along the center of the through hole 62. The grooves 61 on both sides of the cross slider 6 are cross-shaped. The other end of the clamping bushing 4 has two protruding keys 43 axially protruding on both sides of the fixing hole 42. The two protruding keys 43 are symmetrical with respect to the center line of the fixing hole 42 so that they can cooperate with the two grooves 61 on one side of the cross slider 6.

[0051] Key references Figure 7 The present invention also includes a supporting mechanism for the auxiliary installation and axial movement drive motor 2. The bottom of the drive motor 2 is provided with a motor base 25. The supporting mechanism includes an elongated groove 23 axially arranged on the base plate 32 of the motor base, a sliding key 323 protruding on the base 3, and a positioning key 24 protruding on the bottom of the motor base 25. When the base plate 32 of the motor base slides axially on the base 3, the sliding key 323 slides in the elongated groove. Specifically, when the base plate 32 of the motor base is axially moved so that the sliding key 323 is located at one end of the elongated groove 23, the transmission key shaft 7 moves just to cooperate with the cross slider 6 on the clamping bushing 4, thereby realizing the precise connection of the clamping bushing 4, the cross slider 6 and the transmission key shaft 7. When the sliding key 323 moves to the other end of the elongated groove 23, the positioning shaft 11 and the motor main shaft 21 are disconnected, and the distance between the drive motor 2 and the test head 1 is sufficient for the test head 1 to rotate. The matching mechanism makes it easy for the drive motor 2 to return to its original position. The axis of the motor spindle 21 remains unchanged. The centers of the clamping bushing 4, the cross slider 6 and the transmission key shaft 7 are kept on the same axis. The drive motor 2 can be engaged or disengaged by axial movement, without the need to adjust the position of the drive motor 2 radially.

[0052] The positioning key 24 is correspondingly positioned to the long slot 23. When installing the drive motor 2, aligning the positioning key 24 with the long slot 23 and inserting the positioning key 24 into the long slot 23 allows for precise installation of the drive motor 2 onto the motor base plate 32, ensuring the drive motor 2 is in the optimal assembly position. The position of the drive motor 2 will not shift radially, and the axis of the motor spindle 21 remains unchanged, thus ensuring the motor spindle 21 is coaxial with the positioning shaft 11. The positioning key 24 is located above the sliding key 323 and spaced apart, so they do not interfere with each other.

[0053] Key references Figure 1 The lubricant testing machine also includes an adjusting bolt 322. The motor base plate 32 has a strip hole 321 along the axial direction. The adjusting bolt 322 passes through the strip hole 321 and is threaded to the base 3 to lock the motor base plate 32. The adjusting bolt 322 must be loosened first before the motor base plate 32 can be moved axially, that is, the drive motor 2 can be moved. After the movement is completed, the adjusting bolt 322 is used to lock the motor base plate 32.

[0054] In a preferred embodiment, a hand-cranked drive device 33 is provided on one side of the axial direction of the motor base plate 32. The hand-cranked drive device 33 is fixed on one side of the axial direction of the base 3 and is drivenly connected to the motor base plate 32. The hand-cranked drive device 33 is rotatably provided with a handle 331. The handle 331 is connected to a screw 332. The screw 332 is threadedly connected to the motor base plate 32. Rotating the handle 331 circumferentially drives the motor base plate 32 to move axially, which facilitates the control of the axial movement of the drive motor 2 to realize the engagement and disengagement of the heat-insulating coupling clutch.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the design of this case. All equivalent changes made based on the key design features of this case shall fall within the protection scope of this case.

Claims

1. A heat isolating coupling for a lubricant testing machine, characterized by: The invention relates to a lubricant testing machine, which includes a testing head arranged in a horizontal rotation and a drive motor arranged in an axial movement. The testing head is provided with a horizontally arranged positioning shaft, and the drive motor is provided with a motor spindle. The positioning shaft is axially connected to the motor spindle of the drive motor. The heat-insulating coupling clutch includes a clamping bushing, an elastic tapered sleeve, a cross slider, a transmission key shaft, a connecting bushing, a spring, a connecting key, a locking screw, and a positioning screw. The elastic tapered sleeve is fitted onto the positioning shaft. One end of the clamping bushing has a tapered inner hole that mates with the elastic tapered sleeve, and the other end has a fixing hole that communicates with the tapered inner hole. When one end of the clamping bushing is fitted onto the elastic tapered sleeve, the locking screw passes through the fixing hole and is threadedly connected to the positioning shaft, causing the elastic tapered sleeve to clamp the positioning shaft. One end of the connecting bushing is connected to the motor spindle, and the other end has a connecting hole. The spring is placed horizontally in the connecting hole. The other end of the connecting bushing has a first keyway radially opening on its side wall, which communicates with the connecting hole. The middle part of the transmission convex key shaft has a second keyway. When one end of the transmission convex key shaft is inserted into the connecting hole to compress the spring, the second keyway aligns with the first keyway for the connecting key to be inserted. The other end of the transmission convex key shaft has a mounting hole axially opening at its center, which communicates with the second keyway. The positioning screw is threaded into the mounting hole. The connecting key has a V-groove on the side aligned with the positioning screw, and the end of the positioning screw is engaged in the V-groove. The cross slider is made of heat-insulating material, and the two sides of the cross slider are provided with grooves that intersect in a cross shape. The other end of the clamping bushing and the transmission key shaft are both provided with a key that mates with the groove.

2. A heat shielded coupling for a lubricant tester as defined in claim 1 wherein: The sidewall of the elastic cone sleeve has an axially penetrating slit.

3. A heat shielded coupling for a lubricant tester as set forth in claim 1, wherein: The other end of the clamping bushing has a fixing hole at its center, and one end of the positioning shaft has an internal thread at its center. The locking screw passes through the fixing hole and is threaded to the internal thread. The other end of the clamping bushing has two protruding keys axially protruding on both sides of the fixing hole.

4. A heat shielded coupling for a lubricant tester as set forth in claim 1, wherein: The cross slider has a through hole in its center, which is used to allow space for the head of the locking screw.

5. The heat-insulating coupling clutch of a lubricant testing machine as described in claim 1, characterized in that: One end of the motor spindle is provided with a chuck, which clamps and fixes one end of the connecting bushing.

6. A heat shielded coupling for a lubricant tester as set forth in claim 1, wherein: The two side walls at one end of the connecting shaft sleeve are provided with first keyways, and the second keyway radially penetrates the middle of the transmission key shaft. When the second keyway is aligned with the two first keyways, the connecting key is inserted into the second keyway and the two first keyways.

7. A heat shielded coupling for a lubricant testing machine as set forth in claim 1, wherein: The lubricant testing machine also includes a base and a motor base plate. The base is provided with a head plate for mounting the testing head. The head plate has a rotation center on the base and rotates relative to the base through the rotation center. The base is also provided with an axially sliding motor base plate for mounting the drive motor.

8. A heat shielded coupling for a lubricant tester as set forth in claim 7, wherein: It also includes a supporting mechanism. The bottom of the drive motor is provided with a motor base. The supporting mechanism includes an elongated groove axially arranged on the base plate of the motor base, a sliding key protruding on the base, and a positioning key protruding on the bottom of the motor base. When the base plate of the motor base slides axially on the base, the sliding key slides in the elongated groove. When the motor base is installed on the base plate of the motor base, the positioning key is inserted into the elongated groove accordingly.

9. The heat-insulating coupling clutch of a lubricant testing machine as described in claim 7 or 8, characterized in that: The lubricant testing machine also includes an adjusting bolt. The motor base plate has a strip hole along the axial direction. The adjusting bolt passes through the strip hole and is threaded to the base to lock the motor base plate.

10. A heat shielded coupling for a lubricant testing machine as defined in claim 9 wherein: A hand-cranked drive device is provided on one side of the motor base plate along the axial direction. The hand-cranked drive device is fixed on one side of the base along the axial direction and is driven to the motor base plate. The hand-cranked drive device has a handle that is rotated. Rotating the handle in the circumferential direction drives the motor base plate to move axially.

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