Interference fitting device for motor and gear

Abstract

The utility model relates to the field of motor and gear assembly, and discloses a motor and gear interference connection device, which is used for interference connection of an inner taper hole of a motor shaft and a taper end of a gear, and comprises a handheld hydraulic cylinder, a fastener, a screw rod and a manual pump, two ends of the screw rod are respectively connected with the motor shaft and the fastener; one end of the handheld hydraulic cylinder is tightly attached to the end face, away from the taper end, of the gear, and the other end of the handheld hydraulic cylinder is tightly attached to the fastener; the handheld hydraulic cylinder is provided with a hydraulic combination connector communicated with the interior of the piston cavity, the hydraulic combination connector is connected with a manual pump, and the manual pump provides required hydraulic pressure to drive the handheld hydraulic cylinder. The device can determine the press-in force of the gear, is small and portable, is suitable for indoor and outdoor assembly, and cannot cause damage to threads in the inner hole of the motor shaft due to the assembly problem.

Description

Technical Field

[0001] The utility model relates to the field of motor and gear assembly, in particular to an interference connection device for a motor and a gear. Background Art

[0002] A Chinese utility model patent with publication number "CN215208295U" discloses a method of using a conical interference fit connection between a motor and a gear. The conical interference fit connection is formed by squeezing the conical surfaces between the mating parts to form an interference fit, thereby achieving a tight connection between the gear and the motor shaft, ensuring high centering accuracy, no gap in transmission, and having the ability to transmit a large torque, making it an ideal choice in high-speed and large-torque situations. However, this connection method requires strict control of the pressing force of the tapered end of the gear into the tapered hole in the motor shaft during assembly. The size of the pressing force directly affects the strength and stability of the interference connection. If the pressing force is too small, it may lead to a loose connection and affect the transmission effect. If the pressing force is too large, it may damage the mating surface. In addition, in order to ensure the matching width of the gear, it is also necessary to control the height of the tapered end of the gear pressed into the motor shaft.

[0003] At present, the traditional assembly method uses a pneumatic bolt tightening machine with a large tightening torque to continuously screw in the bolts, and compress the gears under the action of the pre-tightening force generated by the bolts. This requires the gear height to be continuously measured during the assembly process, which increases the complexity and difficulty of assembly. Moreover, this assembly method can only control the height of the gear, the pressing force fluctuates greatly, and the size of the pressing force cannot be obtained, resulting in the strength of the interference connection being uncontrollable. In addition, this assembly method is not friendly to after-sales maintenance, especially in harsh environments such as the wild. It is difficult to provide special tools such as high-torque tightening guns, making gear assembly difficult. At the same time, since the bolts need to be continuously screwed in during the assembly process to generate pre-tightening force, the threads in the inner hole of the motor shaft are easily damaged, which will have an adverse effect on subsequent assembly and maintenance. This not only increases the maintenance cost, but may also affect the normal operation of the equipment. Utility Model Content

[0004] The purpose of the utility model is to solve at least one of the problems existing in the prior art and to provide a motor and gear interference connection device, which can clearly determine the pressing force of the gear. The device is small and portable, suitable for indoor and outdoor assembly, and will not cause damage to the thread teeth in the inner hole of the motor shaft due to assembly problems.

[0005] In order to achieve the above-mentioned purpose, the utility model provides a motor and gear interference connection device, which is used for interference connection between the inner tapered hole of the motor shaft and the tapered end of the gear. The motor and gear interference connection device includes a handheld hydraulic cylinder, a fastener, a screw and a manual pump;

[0006] One end of the screw is connected to the motor shaft, and the other end of the screw is connected to the fastener;

[0007] The hand-held hydraulic cylinder is sleeved on the screw rod, one end of the hand-held hydraulic cylinder is in close contact with the end surface of the gear away from the tapered end, and the other end of the hand-held hydraulic cylinder is in close contact with the fastener;

[0008] The hand-held hydraulic cylinder is provided with a hydraulic combination joint communicating with the piston cavity, the hydraulic combination joint is connected to the manual pump, and the manual pump provides the required hydraulic pressure to drive the hand-held hydraulic cylinder.

[0009] Optionally, the handheld hydraulic cylinder comprises a cylinder barrel, a piston and an end cover arranged in a hollow double-annular structure;

[0010] The cylinder comprises a cylinder inner hole for the screw to pass through, a cylinder inner wall, a cylinder outer wall and an oil port for connecting the hydraulic combination joint, a limited end surface is arranged at the bottom of the cylinder, and a cylinder thread which cooperates with the end cover is arranged at the top of the cylinder;

[0011] The inner wall of the cylinder, the outer wall of the cylinder, the end cover and the bottom of the cylinder form an annular piston cavity for accommodating the piston and allowing the movement of the piston. The limiting end surface is used to limit the maximum stroke of the piston during movement.

[0012] Optionally, the piston is configured as an annular structure matching the cylinder, the piston includes a piston rod, the outer circumferential surface of the piston is sequentially provided with an outer support ring groove and an outer sealing ring groove, and the inner circumferential surface of the piston is sequentially provided with an inner support ring groove, an inner sealing ring groove and an inner dust ring groove.

[0013] Optionally, an outer support ring, an outer sealing ring, an inner support ring, an inner sealing ring and an inner dust ring are arranged between the piston and the cylinder in sequence, corresponding to the outer support ring groove, the outer sealing ring groove, the inner support ring groove, the inner sealing ring groove and the inner dust ring groove.

[0014] Optionally, the end cover is arranged on the top of the cylinder, and the end cover is arranged as an annular structure matching the cylinder and the piston respectively, the outer circumferential surface of the end cover is sequentially provided with a cylinder cover limit step and a cylinder cover thread matching the cylinder thread, the inner circumferential surface of the end cover is provided with an outer dust ring groove, and the end of the end cover away from the motor shaft is provided with a maximum stroke step surface.

[0015] Optionally, an outer dust ring corresponding to the outer dust ring groove is provided between the end cover and the piston.

[0016] Optionally, the manual pump includes an oil tank, a first control valve and a relief valve, the outlet of the oil tank is connected to the first control valve, the inlet of the relief valve is connected to the first control valve, and the outlet of the relief valve is connected to the oil tank.

[0017] Optionally, a second control valve is provided on the pipeline communicating between the manual pump and the hydraulic combination joint, and a pressure gauge is provided on the pipeline communicating between the second control valve and the hydraulic combination joint.

[0018] Optionally, one end of the screw rod is provided with a first thread connected to the internal threaded hole of the motor shaft, and the other end of the screw rod is provided with a second thread connected to the fastener.

[0019] Through the above technical scheme, the utility model provides a motor and gear interference connection device. During the process of pressurizing the manual pump, the pressurized oil enters the handheld hydraulic cylinder, pushing the piston to move, thereby pressing the gear to be interference connected to the motor through the conical surface. After the pressure maintenance is completed, the height of the gear from the motor end face is measured, and the height value is used to determine whether the inner conical surface of the motor shaft and the outer conical end of the gear meet the requirements. The utility model can clearly determine the pressing force of the gear. The device is small and portable, suitable for indoor and outdoor assembly, and will not cause damage to the threaded teeth in the inner hole of the motor shaft due to assembly problems. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an exploded view of a motor and gear interference connection device provided by the utility model;

[0021] Figure 2 This is a schematic diagram of the state before the gear in the utility model is pressed in;

[0022] Figure 3 This is a schematic diagram of the state of the gear after being pressed in in the utility model;

[0023] Figure 4 It is the hydraulic principle diagram of the utility model;

[0024] Figure 5 It is a schematic diagram of the structure of the handheld hydraulic cylinder in the utility model;

[0025] Figure 6 It is a schematic diagram of the cylinder structure in the utility model;

[0026] Figure 7 It is a schematic diagram of the piston structure in the utility model;

[0027] Figure 8 It is a schematic diagram of the end cover structure in the utility model;

[0028] Fig. 9 It is a schematic diagram of the motor shaft structure in the utility model;

[0029] Fig.10 It is a schematic diagram of the double-headed screw structure in the utility model.

[0030] Description of Reference Numerals

[0031] 1. Motor shaft; 101. Inner tapered hole; 102. Inner threaded hole; 2. Gear; 3. Hand-held hydraulic cylinder; 31. Hydraulic combination joint; 32. Cylinder; 321. Cylinder inner hole; 322. Cylinder inner wall; 323. Cylinder outer wall; 324. Oil port; 325. Limit end face; 326. Cylinder thread; 33. Piston; 331. Piston rod; 332. Outer support ring groove; 333. Outer sealing ring groove; 334. Inner support ring groove; 335. Inner sealing ring groove; 336. Inner dust ring groove; 337. Piston bottom; 338 , top of piston; 34, end cover; 341, cylinder head limit step; 342, cylinder head thread; 343, outer dust ring groove; 344, maximum stroke step surface; 4, fastener; 5, screw; 51, first thread; 52, second thread; 6, manual pump; 61, oil tank; 62, first control valve; 63, overflow valve; 7, second control valve; 8, pressure gauge; 9, outer support ring; 10, outer sealing ring; 11, inner support ring; 12, inner sealing ring; 13, inner dust ring; 14, outer dust ring; D, large sealing surface; d, small sealing surface. DETAILED DESCRIPTION

[0032] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0033] It should be noted that the terms "top", "bottom", "upper", "lower", "inner", "outer" and the like in the description of the present invention indicate positions or positional relationships only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present invention. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0034] In addition, the words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements.

[0035] It should also be noted that, in the description of the present invention, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For ordinary technicians in this field, the specific meaning of the above terms in the present invention can be understood according to the specific circumstances.

[0036] Figure 1 This is an exploded view of a motor and gear interference connection device provided by the utility model; Figure 2 It is a schematic diagram of the state before the gear is pressed into the tapered hole in the motor shaft when the interference fit connection device between the motor and the gear provided by the utility model is used; Figure 3 This is a schematic diagram of the state of the gear after it is pressed into the tapered hole in the motor shaft when the interference fit connection device between the motor and the gear provided by the utility model is used; Figure 1 , Figure 2 and Figure 3 In the figure, the interference connection device between the motor and the gear includes a hand-held hydraulic cylinder 3, a fastener 4, a screw 5 and a manual pump 6.

[0037] Specifically, one end of the screw rod 5 is connected to the motor shaft 1, and the other end of the screw rod 5 is connected to the fastener 4. The hand-held hydraulic cylinder 3 is sleeved on the screw rod 5, and one end of the hand-held hydraulic cylinder 3 is tightly attached to the end surface of the gear 2 away from the tapered end, and the other end of the hand-held hydraulic cylinder 3 is tightly attached to the fastener 4; the hand-held hydraulic cylinder 3 is provided with a hydraulic combination joint 31 connected to the piston cavity, and the hydraulic combination joint 31 is connected to the manual pump 6, and the manual pump 6 provides the required hydraulic pressure to drive the hand-held hydraulic cylinder 3.

[0038] It can be understood that the interference fit connection device between the motor and the gear in the utility model is used for the interference fit connection between the inner tapered hole 101 of the motor shaft 1 and the tapered end of the gear 2. When it is necessary to press the tapered end of the gear 2 into the inner tapered hole 101 of the motor shaft 1, first align the outer tapered surface of the gear 2 with the inner tapered surface of the motor shaft 1 and gently push it in. Then, one end of the screw rod 5 passes through the gear 2 and is tightly connected to the bottom end of the inner tapered hole 101 of the motor shaft 1. The connection method between the two can be any appropriate method that can be thought of by people in this field. Then, the hand-held hydraulic cylinder 3 is sleeved on the screw rod 5, and a fastener 4 is installed at the other end of the screw rod 5 so that the fastener 4 is close to the hand-held hydraulic cylinder 3. The fastener 4 is used to limit the axial movement of the hand-held hydraulic cylinder 3 under force during the assembly process to ensure stability and accuracy during the press-fitting process. It can be any appropriate connector that can be thought of by people in this field, such as a hand-screw nut. The design of the hand-screw nut should allow manual rotation and be able to firmly maintain its position after tightening. It is flexible enough, low cost, and easy to use. The hand-held hydraulic cylinder 3 is connected to the hydraulic oil circuit in the manual pump 6 through a hydraulic combination joint 31 provided thereon and connected to the piston cavity. The manual pump 6 provides the required hydraulic pressure to drive the piston 33 in the hand-held hydraulic cylinder 3 to move, thereby pushing the outer conical end of the gear 2 to form an interference connection with the inner conical surface of the motor shaft 1.

[0039] The traditional interference connection between the motor and the gear usually uses a pneumatic bolt tightening machine with a large tightening torque to continuously screw in the bolts, and the gears are pressed under the action of the pre-tightening force generated by the bolts. During the tightening process, the gear height needs to be continuously measured. This assembly method only controls the height of the gear, and the pressing force fluctuates greatly and the size of the pressing force cannot be obtained, resulting in the strength of the interference connection being uncontrollable. In this embodiment of the utility model, during the pressurization process of the manual pump, the pressurized oil enters the handheld hydraulic cylinder, pushing the piston to move and thereby pressing the gear to be connected to the motor through the conical surface interference, and when the required hydraulic pressure is reached, it is maintained for a period of time. After the pressure is maintained, the height of the gear from the motor end face is measured, and the height value is used to determine whether the inner cone surface of the motor shaft and the outer cone end of the gear meet the requirements, thereby realizing a re-inspection of whether the incoming materials meet the use requirements.

[0040] The technical solution provided by the utility model can clearly define the pressing force of the gear 2, intuitively control the friction torque generated by the tapered interference fit connection, and avoid the low torque generated by the tapered interference fit connection between the gear 2 and the motor shaft 1 due to insufficient pressing force, which leads to gear slippage and transmission failure. Under precise pressing force, the height of the gear 2 relative to the end face of the motor can be measured to reversely infer whether the cooperation between the inner tapered hole 101 of the motor shaft and the outer tapered surface of the gear meets the design requirements, ensuring qualified connection torque and gear meshing width. Moreover, the equipment is compact and portable, suitable for indoor and outdoor assembly, and is conducive to solving after-sales maintenance problems. In this installation method, after the screw 5 is installed, the handheld hydraulic cylinder 3 applies pressure to push the outer tapered end of the gear 2 to the inner tapered surface of the motor shaft 1 for interference fit, without damaging the inner threaded hole of the motor shaft.

[0041] In the present utility model, if Figure 5 As shown, the handheld hydraulic cylinder 3 includes a cylinder barrel 32 , a piston 33 and an end cover 34 .

[0042] like Figure 6 As shown, the cylinder 32 is configured as a hollow double-annular structure 32, which is configured so that the handheld hydraulic cylinder 3 can be covered on the screw 5. Specifically, the cylinder 32 includes a cylinder inner hole 321 for the screw 5 to pass through, a cylinder inner wall 322, a cylinder outer wall 323, and an oil port 324 for connecting the hydraulic combination joint 31. A limited end face 325 is provided at the bottom of the cylinder 32, and a cylinder thread 326 is provided at the top of the cylinder 32 to be matched with the end cover 34.

[0043] The cylinder inner wall 322 , the cylinder outer wall 323 , the end cover 34 and the bottom of the cylinder 32 form an annular piston chamber for accommodating the piston 33 and allowing the movement of the piston 33 .

[0044] The limiting end surface 325 is used to limit the maximum stroke of the piston 33 during movement. Specifically, the limiting end surface 325 can ensure that after the hydraulic medium in the hand-held hydraulic cylinder 3 is completely depressurized, the piston top 338 (see Figure 7 ) and the bottom of the cylinder 32 can still leave a gap to avoid blocking the oil port 324 set on the outer wall 323 of the cylinder and connected to the internal piston cavity. The oil port 324 is set at a position close to the bottom of the cylinder 32.

[0045] In the present utility model, if Figure 7 As shown, the piston 33 includes a piston rod 331. When the pressure oil enters the hand-held hydraulic cylinder, the piston 33 is pushed to move, and the piston bottom end 337 of the piston rod 331 contacts the gear 2 and applies pressure thereto.

[0046] The piston 33 is configured as an annular hollow structure matching the cylinder 32. The outer circumferential surface of the piston 33 is sequentially provided with an outer support ring groove 332 and an outer sealing ring groove 333, and the inner circumferential surface of the piston 33 is sequentially provided with an inner support ring groove 334, an inner sealing ring groove 335 and an inner dust ring groove 336. The outer circumferential surface of the piston 33 abuts against the outer wall 323 of the cylinder, and the inner circumferential surface of the piston 33 abuts against the inner wall 322 of the cylinder.

[0047] Furthermore, combined with Figure 5 , Figure 6 and Figure 7 As shown, an outer support ring 9, an outer sealing ring 10, an inner support ring 11, an inner sealing ring 12 and an inner dust ring 13 are arranged between the piston 33 and the cylinder 32 in sequence, corresponding to the outer support ring groove 332, the outer sealing ring groove 333, the inner support ring groove 334, the inner sealing ring groove 335 and the inner dust ring groove 336.

[0048] It can be understood that the outer support ring groove 332 is used to install the outer support ring 9, which enhances the fit between the outer circumferential surface of the piston 33 and the outer wall 323 of the cylinder, and provides additional support and stability; the outer sealing ring groove 333 is used to install the outer sealing ring 10 to prevent the hydraulic medium from leaking from the gap between the outer circumferential surface of the piston 33 and the outer wall 323 of the cylinder, and maintain the sealing of the hydraulic system.

[0049] The inner support ring groove 334 is used to install the inner support ring 11 to enhance the fit between the inner circumferential surface of the piston 33 and the inner wall 322 of the cylinder; the inner sealing ring groove 335 is used to install the inner sealing ring 12 to prevent the hydraulic medium from leaking from the gap between the inner circumferential surface of the piston 33 and the inner wall 322 of the cylinder; the inner dust ring groove 336 is used to install the inner dust ring 13 to prevent dust, dirt, etc. from entering the piston cavity of the piston 33 through the gap between the inner circumferential surface of the piston 33 and the inner wall 322 of the cylinder, thereby protecting the piston and the hydraulic system from the influence and damage of the external environment.

[0050] In the present utility model, if Figure 8 As shown, the end cover 34 is arranged on the top of the cylinder 32, and the end cover 34 is arranged as an annular structure respectively matching the cylinder 32 and the piston 33, and the outer circumferential surface of the end cover 34 is sequentially provided with a cylinder cover limiting step 341 and a cylinder cover thread 342 matched with the cylinder thread 326, and the inner circumferential surface of the end cover 34 is provided with an outer dust ring groove 343, and the end of the end cover 34 away from the motor shaft 1 is provided with a maximum stroke step surface 344.

[0051] The cylinder head limiting step 341 is used as a limiting step for the cylinder head thread 342. Its main function is to ensure that a pre-tightening force can be generated between the cylinder head thread 342 and the cylinder thread 326, and to enhance the sealing and stability of the connection between the cylinder head thread 342 and the cylinder thread 326. The maximum stroke step surface 344 is located at the end of the end cover 34 away from the motor shaft 1, and is used to limit the maximum stroke of the piston 33. When the piston 33 is pushed by the hydraulic pressure, its movement range is controlled by the end cover to ensure that it does not exceed the designed safety range.

[0052] Furthermore, an outer dust ring 14 corresponding to the outer dust ring groove 343 is provided between the end cover 34 and the piston 33. The outer dust ring groove 343 is used to install the outer dust ring 14 to prevent dust, dirt, etc. from entering the piston cavity of the piston 33 through the gap between the inner circumferential surface of the end cover 34 and the outer circumferential surface of the piston 33, thereby protecting the piston and the hydraulic system from the influence and damage of the external environment.

[0053] In the present utility model, if Figure 4 As shown, the manual pump 6 includes an oil tank 61, a first control valve 62 and a relief valve 63, and these components work together to ensure the stable output of hydraulic pressure and the safety of the system.

[0054] The outlet of the oil tank 61 is connected to the first control valve 62, the inlet of the relief valve 63 is connected to the first control valve 62, and the outlet of the relief valve 63 is connected to the oil tank 61. The relief valve 63 is a safety protection device of the manual pump 6. It is connected to the hydraulic pipeline. When the system pressure exceeds the set value, the relief valve 63 will automatically open and return the excess hydraulic oil to the oil tank 61 to prevent damage or failure caused by excessive system pressure. At the same time, by adjusting the set value of the relief valve 63, the maximum working pressure of the system can be controlled to ensure the safe and stable operation of the system.

[0055] Furthermore, a second control valve 7 is provided on the pipeline connecting the manual pump 6 and the hydraulic combination joint 31, and a pressure gauge 8 is provided on the pipeline connecting the second control valve 7 and the hydraulic combination joint 31. The pressure gauge 8 can display the pressure value in the pipeline in real time, and provide the operator with accurate system status information. By observing the reading of the pressure gauge 8, the operator can quickly determine whether corresponding adjustment measures need to be taken.

[0056] In the present utility model, if Fig. 9 and 10 As shown, one end of the screw rod 5 is provided with a first thread 51 that can be connected to the internal thread hole 102 of the motor shaft 1, and the other end of the screw rod 5 is provided with a second thread 52 that can be connected to the fastener 4. The threaded connection mode of the screw rod 5 can enhance the stability of the connection and facilitate installation and disassembly.

[0057] The utility model also provides an assembly method of a motor and a gear interference connection device. Specifically, the assembly method comprises:

[0058] Step 1: Align the outer conical surface of gear 2 with the inner conical surface of motor shaft 1 and push it in gently;

[0059] Step 2: Connect one end of the screw rod 5 to the bottom end of the inner tapered hole 101 of the motor shaft 1;

[0060] Step 3: A hand-held hydraulic cylinder 3 is disposed outside the screw rod 5, and a fastener 4 is installed at the other end of the screw rod 5 so as to be close to the hand-held hydraulic cylinder 3;

[0061] Step 4: Connect the hand-held hydraulic cylinder 3 to the hydraulic oil circuit of the manual pump 6, press the manual pump 6 to provide hydraulic pressure to drive the hand-held hydraulic cylinder 3, and when the required hydraulic pressure is reached, maintain the pressure for a period of time;

[0062] Step 5: Use the handheld hydraulic cylinder 3 to push the gear 2 into the inner tapered hole 101 of the motor shaft 1;

[0063] Step 6: After the pressure holding is completed, measure the height of gear 2 from the motor end face, and use the height value to determine whether the inner conical surface of motor shaft 1 and the outer conical surface of gear 2 meet the requirements.

[0064] In steps 1 to 6, first align the outer conical surface of the tapered end of the gear 2 with the inner conical surface of the inner conical hole 101 of the motor shaft 1 and gently push it in, then connect one end of the screw rod 5 to the bottom end of the inner conical hole 101 of the motor shaft 1. Preferably, one end of the screw rod 5 is provided with a first thread 51, and the screw rod 5 is directly screwed into the inner threaded hole 102 at the bottom end of the inner conical hole 101 of the motor shaft 1. Then, a hand-held hydraulic cylinder 3 is arranged outside the screw rod 5, and a fastener 4 is installed at the other end of the screw rod 5 to make it close to the hand-held hydraulic cylinder 3. Preferably, the other end of the screw rod 5 is provided with a second thread 52, and the fastener 4 can be a hand-screw nut. After the hand-held hydraulic cylinder 3 is arranged outside the screw rod 5, the hand-screw nut is screwed in to make it close to the hand-held hydraulic cylinder 3, and then follow the steps. Figure 4 As shown, the hand-held hydraulic cylinder 3 is connected to the hydraulic pipeline in the manual pump 6 through the hydraulic combination joint 31. The manual pump 6 is pressed to provide hydraulic pressure to drive the hand-held hydraulic cylinder 3. When the required hydraulic pressure is reached, the pressure is maintained for a period of time. Preferably, a second control valve 7 is arranged on the hydraulic pipeline connected between the manual pump 6 and the hydraulic combination joint 31, and a pressure gauge 8 is arranged on the pipeline connected between the second control valve 7 and the hydraulic combination joint 31.

[0065] The required output hydraulic pressure of the manual pump 6 can be calculated by the formula:

[0066] The required pressing force (N) of gear 2 is known: F;

[0067] Piston area of ​​hand-held hydraulic cylinder 3 (mm 2 ):

[0068] Determination of required pressure (MPa):

[0069] Before driving the hand-held hydraulic cylinder 3, the overflow pressure of the overflow valve 63 in the manual pump 6 is set to 110% of the required pressure P, and the first control valve 62 is closed. The second control valve 7 in the hydraulic pipeline is opened, the manual pump 6 is pressed, and the pressure gauge 8 is observed. When the pressure gauge 8 displays the value of the required pressure P, the pressure is maintained or the second control valve 7 is directly closed. Preferably, the pressure is maintained for 3-5 seconds or the second control valve 7 is closed for 3-5 seconds.

[0070] During the process of pressurizing the manual pump 6, the hydraulic medium enters the handheld hydraulic cylinder 3 through the hydraulic pipeline, pushing the piston 33 to compress the gear 2 and the motor shaft 1 to form an interference fit. After the pressure maintenance is completed, the height of the gear 2 from the motor end face is measured, and the height value is used to determine whether the inner cone surface of the motor and the outer cone surface of the gear meet the requirements, thereby realizing re-inspection of whether the incoming materials meet the use requirements.

[0071] Finally, the first control valve 62 in the manual pump 6 is opened, and the second control valve 7 is opened to collect the hydraulic medium in the hand-held hydraulic cylinder 3 into the oil tank 61 in the manual pump 6 .

[0072] After the manual pump 6 is depressurized, the gear 2 is connected to the motor shaft 1 through the conical surface interference fit, pushing the cylinder 32 of the hand-held hydraulic cylinder 3, so that the piston 33 returns to the initial position of the hand-held hydraulic cylinder 3, closing the first control valve 62 in the manual pump 6, and closing the second control valve 7. The hydraulic system does not need to be disassembled and can be stored as a whole until the next use. There is no leakage of hydraulic medium during the whole process, which is clean and convenient.

[0073] In a specific embodiment, when the handheld hydraulic cylinder 3 applies a pressing force, the cylinder barrel 32 presses the fastener 4, the fastener 4 is fixed on the screw 5, the screw 5 is connected to the internal threaded hole of the motor shaft 2, and the piston bottom end 337 of the piston 33 provides a pressing force to the gear 2, and finally presses into the inner tapered hole of the motor shaft 1. The motor shaft 1 is provided with support for the entire assembly process and the final force-bearing element is the motor shaft 1, which can effectively protect the motor bearings.

[0074] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations. However, these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.

Claims

1. A motor and gear interference connection device, used for interference connection between the inner tapered hole (101) of the motor shaft (1) and the tapered end of the gear (2), characterized in that: The motor and gear interference connection device comprises a hand-held hydraulic cylinder (3), a fastener (4), a screw rod (5) and a manual pump (6); One end of the screw rod (5) is connected to the motor shaft (1), and the other end of the screw rod (5) is connected to the fastener (4); The hand-held hydraulic cylinder (3) is sleeved on the screw rod (5), one end of the hand-held hydraulic cylinder (3) is in close contact with the end surface of the gear (2) away from the tapered end, and the other end of the hand-held hydraulic cylinder (3) is in close contact with the fastener (4); The hand-held hydraulic cylinder (3) is provided with a hydraulic combination joint (31) communicating with the piston cavity; the hydraulic combination joint (31) is connected to the manual pump (6); and the manual pump (6) provides the required hydraulic pressure to drive the hand-held hydraulic cylinder (3).

2. The interference fit connection device between a motor and a gear according to claim 1, characterized in that: The handheld hydraulic cylinder (3) comprises a cylinder barrel (32) arranged in a hollow double-annular structure, a piston (33) and an end cover (34); The cylinder (32) comprises a cylinder inner hole (321) for the screw (5) to pass through, a cylinder inner wall (322), a cylinder outer wall (323), and an oil port (324) for connecting to the hydraulic combination joint (31); a limit end surface (325) is provided at the bottom of the cylinder (32); and a cylinder thread (326) is provided at the top of the cylinder (32) for matching and connecting with the end cover (34); The cylinder inner wall (322), the cylinder outer wall (323), the end cover (34) and the bottom of the cylinder (32) form an annular piston cavity for accommodating the piston (33) and allowing the movement of the piston (33), and the limiting end surface (325) is used to limit the maximum stroke of the piston (33) during movement.

3. The interference fit connection device between a motor and a gear according to claim 2, characterized in that: The piston (33) is configured as an annular structure matching the cylinder (32), and the piston (33) includes a piston rod (331). The outer peripheral surface of the piston (33) is sequentially provided with an outer support ring groove (332) and an outer sealing ring groove (333), and the inner peripheral surface of the piston (33) is sequentially provided with an inner support ring groove (334), an inner sealing ring groove (335) and an inner dust ring groove (336).

4. The interference fit connection device between a motor and a gear according to claim 3, characterized in that: An outer support ring (9), an outer sealing ring (10), an inner support ring (11), an inner sealing ring (12) and an inner dust ring (13) are sequentially arranged between the piston (33) and the cylinder barrel (32), corresponding to the outer support ring groove (332), the outer sealing ring groove (333), the inner support ring groove (334), the inner sealing ring groove (335) and the inner dust ring groove (336).

5. The interference fit connection device between a motor and a gear according to claim 2, characterized in that: The end cover (34) is arranged at the top of the cylinder (32), and the end cover (34) is arranged as an annular structure respectively matching the cylinder (32) and the piston (33). The outer peripheral surface of the end cover (34) is sequentially provided with a cylinder cover limiting step (341) and a cylinder cover thread (342) matched with the cylinder thread (326). The inner peripheral surface of the end cover (34) is provided with an outer dust ring groove (343). The end of the end cover (34) away from the motor shaft (1) is provided with a maximum stroke step surface (344).

6. The interference fit connection device between a motor and a gear according to claim 5, characterized in that: An outer dust ring (14) corresponding to the outer dust ring groove (343) is arranged between the end cover (34) and the piston (33).

7. The interference fit connection device between a motor and a gear according to claim 1, characterized in that: The manual pump (6) comprises an oil tank (61), a first control valve (62) and a relief valve (63); the outlet of the oil tank (61) is connected to the first control valve (62); the inlet of the relief valve (63) is connected to the first control valve (62); and the outlet of the relief valve (63) is connected to the oil tank (61).

8. The interference fit connection device between a motor and a gear according to claim 7, characterized in that: A second control valve (7) is provided on the pipeline communicating between the manual pump (6) and the hydraulic combination joint (31), and a pressure gauge (8) is provided on the pipeline communicating between the second control valve (7) and the hydraulic combination joint (31).

9. The interference fit connection device between a motor and a gear according to claim 1, characterized in that: One end of the screw rod (5) is provided with a first thread (51) connected to the internal threaded hole (102) of the motor shaft (1), and the other end of the screw rod (5) is provided with a second thread (52) connected to the fastener (4).

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