Oil-proof servo motor for numerical control machine tool

Abstract

The present application relates to servo motor technical field, especially to a kind of oil-proof servo motor for numerical control machine tool, including motor body and the drive shaft being set on motor body, drive shaft is provided with oil-proof mechanism, oil-proof mechanism includes backing plate, sealing bearing, oil-proof component, drive assembly, shell, connecting block, mounting disc and sealing ring, sealing bearing is set on drive shaft, backing plate is set on sealing bearing, oil-proof component is set on backing plate, drive assembly is set on drive shaft, shell is set on backing plate, connecting block is circumferentially set on shell, connecting block is fixedly connected with backing plate, to solve, since numerical control machine tool is processed, the output shaft speed requirement of servo motor is changeable, easy to damage skeleton oil seal, leading to need to frequently replace skeleton oil seal, and servo motor is worn sealing ring at the junction of servo motor and reduction gear box in long-term work, leading to the problem that the lubricating oil in gear box is also easy to enter servo motor.

Description

Technical Field

[0001] This invention relates to the field of servo motor technology, and in particular to an oil-resistant servo motor for CNC machine tools. Background Technology

[0002] A CNC machine tool is an automated machine tool equipped with a program control system. CNC machine tools effectively solve the problems of machining complex, precise, small-batch, and multi-variety parts. They are flexible, high-efficiency automated machine tools, representing the development direction of modern machine tool control technology, and are a typical mechatronics product. The basic components of a CNC machine tool include a machining program carrier, a CNC device, a servo drive device, the machine tool body, and other auxiliary devices.

[0003] The servo drive system of a CNC machine tool generally includes a spindle servo motor, an X-axis servo motor, a Y-axis servo motor, a Z-axis servo motor, a reduction gearbox, and a transmission device. Each servo motor's output shaft is connected to the reduction gearbox, which in turn is connected to the transmission device, thus enabling the corresponding motion. Currently, when connecting the servo motor's output shaft to the reduction gearbox, a skeleton oil seal is typically installed on the servo motor's output shaft to prevent lubricating oil from the reduction gearbox from leaking into the servo motor. However, because the output shaft speed of the servo motor varies frequently during CNC machining, the skeleton oil seal is easily damaged, requiring frequent replacement. Furthermore, the connection between the reduction gearbox and the servo motor's output shaft is usually sealed with a sealing ring. Over long-term operation, the sealing ring is prone to wear, allowing lubricating oil from the gearbox to easily enter the servo motor. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide an oil-proof servo motor for CNC machine tools, which solves the problems that, during CNC machine tool processing, the output shaft speed of the servo motor is required to vary frequently, which can easily damage the oil seal and lead to frequent replacement of the oil seal. In addition, during long-term operation, the sealing ring at the connection between the servo motor and the reduction gearbox is easily worn, which can cause the lubricating oil in the gearbox to easily enter the servo motor.

[0005] The present invention solves the above-mentioned technical problems through the following technical means:

[0006] An oil-resistant servo motor for CNC machine tools includes a motor body and a drive shaft mounted on the motor body. The motor body has a flange, and the drive shaft extends through the flange. An oil-resistant mechanism is mounted on the drive shaft. The oil-resistant mechanism includes a pad, a sealed bearing, an oil-resistant component, a drive assembly, a housing, a connecting block, a mounting plate, and a sealing ring. The sealed bearing is mounted on the drive shaft, the pad is mounted on the outer wall of the sealed bearing, the oil-resistant component is mounted on the pad, the drive assembly is mounted on the drive shaft and is drively connected to the oil-resistant component, the housing is mounted on the pad, the connecting block is circumferentially mounted on the housing, and the connecting block is fixedly connected to the pad. The flange has a mounting groove, the mounting plate is mounted in the mounting groove and fitted onto the outer wall of the housing, and the sealing ring is positioned between the mounting plate and the outer wall of the housing. The drive shaft extends through the housing.

[0007] Furthermore, the oil-proof assembly includes a mounting plate, a connecting ring, a baffle plate, and a sealing sleeve. The mounting plate is installed on the outer wall of the sealed bearing. The baffle plate has a tapered cross-section. The connecting ring is fixedly installed on the outer wall of the baffle plate and is fixedly connected to the mounting plate. A cavity is formed between the baffle plate and the mounting plate. An annular groove is provided in the middle of the sealing sleeve. An annular block is fixedly provided at one end of the baffle plate and is engaged in the annular groove. This arrangement forms an airtight seal between the cavity and the sealing sleeve, preventing external lubricating oil droplets from entering the baffle plate during servo motor operation, thus preventing them from entering the servo motor.

[0008] Furthermore, the two ends of the sealing sleeve are sloped, and annular placement grooves are provided at both ends of the sealing sleeve. Annular springs are provided in the placement grooves. Annular card is provided on one side of the sealing sleeve of the drive assembly. The cross-section of the card is inclined. This arrangement enhances the sealing of the sealing sleeve on the drive shaft.

[0009] Furthermore, the drive assembly includes a rotating block, a transmission rod, a ball-head column, a pressing block, a convex ring, a sealing element, and an elastic element. The rotating block is fixedly mounted on the drive shaft, and a sealing gasket is provided between the rotating block and the inner wall of the housing. The transmission rod is fixedly mounted on the rotating block, the ball-head column is fixedly mounted on the free end of the transmission rod, the convex ring is fixedly mounted on the pressing block, and the convex ring is sleeved on the drive shaft. A track groove is formed on the pressing block, and the ball-head column matches the track groove. A receiving cavity is formed between the pressing block and the baffle plate. The sealing element is provided on the pressing block, and the elastic element is provided between the pressing block and the connecting ring. This arrangement allows the servo motor to drive the rotating block to rotate when it is working. The rotation of the rotating block causes the ball-head column to move between the track groove and the surface of the pressing block, thereby allowing the pressing block to enter the receiving cavity and engage with the inner side of the convex ring, further enhancing the sealing performance when the servo motor is working. At the same time, it can collect the oil that enters the receiving cavity when the servo motor is not working due to a large amount of oil leakage from the reduction gearbox, further preventing leakage into the servo motor.

[0010] Furthermore, the depth of the track groove gradually decreases from the middle to the end, and the end of the track groove is flush with the outer surface of the extrusion block. This arrangement allows the ball head column to extrude the extrusion block during rotation, thus moving the extrusion block.

[0011] Furthermore, the sealing component includes a sleeve, a first sealing ring, and a second sealing ring. One end of the sleeve is fixedly mounted on the connecting ring. The first sealing ring is fixedly mounted on the extrusion block and located between the extrusion block and the sleeve. The second sealing ring has a trapezoidal cross-section and is fixedly connected to the first sealing ring. This arrangement prevents oil from splashing into the servo motor from other places when the servo motor is working due to the presence of oil in the receiving cavity.

[0012] Furthermore, the elastic element includes a retaining ring, a connecting sleeve, a spring, a connecting rod, a sliding block, and a limiting ring. The retaining ring is fixedly mounted on the extrusion block, the connecting rod is circumferentially mounted on the retaining ring, the sliding block is fixedly mounted on the free end of the connecting rod, one end of the connecting sleeve is fixedly mounted on the connecting ring and corresponds to the position of the connecting rod, the spring is mounted inside the connecting sleeve, one end of the spring is fixedly connected to the bottom of the connecting sleeve, and the other end abuts against the sliding block, the limiting ring is mounted on the connecting sleeve, and the connecting rod passes through the limiting ring. This configuration allows the extrusion block to reset when the servo motor is not working and the ball joint is located in the track groove.

[0013] Furthermore, a fixing block is fixedly installed on the housing, and an avoidance groove is provided on the retaining ring at the position of the fixing block. A leakage groove is provided on the fixing block, and a through groove is provided on the sleeve. The through groove and the leakage groove are connected, and the cross-sectional area of ​​the leakage groove is larger than that of the through groove. A flow groove is provided on the housing, and the flow groove is connected to the leakage groove. A plug is provided at the end of the flow groove. The plug is transparent. With this configuration, when there is oil in the receiving cavity, the oil can enter the flow groove along the through groove and the leakage groove. The presence of oil in the flow groove can be checked through the transparent plug. When oil is present, it is possible to check whether the reduction gearbox is leaking oil or whether the gasket is damaged.

[0014] Furthermore, the flow channel is inclined, which allows the oil in the receiving cavity to be released by opening the plug, facilitating maintenance.

[0015] The oil-resistant servo motor for CNC machine tools of the present invention has the following advantages:

[0016] 1. Through the cooperation of the pad, sealed bearing, oil-proof component, drive component, housing, connecting block, mounting plate and sealing ring, it can prevent oil from entering the servo motor from the outside and also prevent oil from entering the servo motor along the drive shaft. When this oil-proof mechanism is used to replace the skeleton oil seal, it can adapt to the situation of the servo motor drive shaft speed changing, saving the cost of use.

[0017] 2. The oil-proof assembly includes a mounting plate, a connecting ring, a baffle plate, and a sealing sleeve. Through the cooperation of the mounting plate, connecting ring, baffle plate, and sealing sleeve, the drive shaft of the servo motor can form an airtight seal when rotating, thus enhancing the sealing effect.

[0018] 3. The drive assembly includes a rotating block, transmission rod, ball head column, extrusion block, convex ring, sealing component, and elastic component. Through the cooperation of the rotating block, transmission rod, ball head column, extrusion block, convex ring, sealing component, and elastic component, the card can engage with the inner side of the convex ring when the servo motor is working, further enhancing the sealing performance of the servo motor during operation. At the same time, it can collect the oil that enters the receiving cavity when the servo motor is not working due to a large amount of oil leakage from the reduction gearbox, further preventing leakage into the servo motor.

[0019] 4. Through the cooperation of the oil-proof component and the drive component, three progressive seals are formed when the servo motor is static or dynamic. This prevents external oil from entering the servo motor along the drive shaft. Furthermore, through the cooperation of the fixed block, through groove, leakage groove, flow groove and plug, the oil leakage of the reduction gearbox connected to the drive shaft can be detected, thereby improving the overall service life of the CNC machine tool. Attached Figure Description

[0020] Figure 1This is a schematic diagram of the structure of an oil-resistant servo motor for CNC machine tools according to the present invention;

[0021] Figure 2 This is a cross-sectional structural schematic diagram of an oil-proof servo motor for CNC machine tools according to the present invention;

[0022] Figure 3 yes Figure 2 Enlarged structural diagram at point A;

[0023] Figure 4 yes Figure 2 Enlarged structural diagram at point B;

[0024] Figure 5 This is a schematic diagram of the installation structure of the oil-proof mechanism in an oil-proof servo motor for CNC machine tools according to the present invention;

[0025] Figure 6 This is a partial installation structure diagram of the oil-proof component in an oil-proof servo motor for CNC machine tools according to the present invention;

[0026] Figure 7 This is a cross-sectional view of the oil-proof component in an oil-proof servo motor for CNC machine tools according to the present invention.

[0027] Figure 8 yes Figure 7 Enlarged structural diagram at point C;

[0028] Figure 9 This is a schematic diagram of the sealing sleeve in the oil-proof component of an oil-proof servo motor for CNC machine tools according to the present invention;

[0029] The components include: motor body 1, drive shaft 11, flange 12, mounting groove 121, housing 2, flow groove 201, connecting block 21, pad 22, mounting plate 23, sealed bearing 24, blocking plate 25, annular locking block 250, connecting ring 251, sleeve 252, through groove 253, sealing sleeve 26, annular locking groove 261, annular placement groove 262, annular spring 263, ramp 264, annular card 265, fixing block 27, leakage groove 271, plug 28, mounting plate 3, sealing ring 31, rotating block 4, sealing gasket 41, transmission rod 42, ball head column 43, extrusion block 44, track groove 441, convex ring 45, first sealing ring 46, second sealing ring 461, retaining ring 5, connecting sleeve 51, spring 52, connecting rod 53, sliding block 531, and limiting ring 54. Detailed Implementation

[0030] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:

[0031] like Figure 1-9As shown, an oil-proof servo motor for CNC machine tools according to the present invention includes a motor body 1 and a drive shaft 11 disposed on the motor body 1. A flange 12 is disposed on the motor body 1, and the drive shaft 11 extends through the flange 12. An oil-proof mechanism is disposed on the drive shaft 11, which includes a pad 22, a sealed bearing 24, an oil-proof component, a drive component, a housing 2, a connecting block 21, a mounting plate 3, and a sealing ring 31. Through the mutual cooperation of the pad 22, the sealed bearing 24, the oil-proof component, the drive component, the housing 2, the connecting block 21, the mounting plate 3, and the sealing ring 31, oil can be prevented from entering the servo motor from the outside, and oil can also be prevented from entering the servo motor along the drive shaft.

[0032] A sealed bearing 24 is fixedly mounted on the drive shaft 11, and a pad 22 is fixedly mounted on the outer wall of the sealed bearing 24. An oil-proof component is mounted on the pad 22, preventing the oil-proof component from rotating when the drive shaft 11 rotates. A drive assembly is mounted on the drive shaft 11 and is connected to the oil-proof component, allowing the drive assembly to rotate and contact the oil-proof component when the drive shaft 11 rotates. Through the cooperation of the drive assembly and the oil-proof component, three progressively layered seals are formed when the servo motor is static or dynamic, preventing external oil from entering the servo motor along the drive shaft. A housing 2 is mounted on the pad 22, and a connecting block 21 is circumferentially mounted on the housing 2. The connecting block 21 is fixedly connected to the pad 22 by bolts. The flange 12 has a mounting groove 121. The mounting plate 3 is installed in the mounting groove 121 and is fitted onto the outer wall of the housing 2. The sealing ring 31 is set between the mounting plate 3 and the outer wall of the housing 2. The drive shaft 11 passes through the housing 2, so that when external oil leaks onto the housing 2, the probability of it entering the servo motor from the housing 2 along the mounting plate 3 is reduced.

[0033] The oil-proof assembly includes a mounting plate 23, a connecting ring 251, a baffle plate 25, and a sealing sleeve 26. The mounting plate 23 is fixedly mounted on the outer wall of the sealed bearing 24. The baffle plate 25 has a tapered cross-section. The connecting ring 251 is fixedly mounted on the outer wall of the baffle plate 25. The connecting ring 251 is fixedly connected to the mounting plate 23 by bolts, so that the mounting plate 23 and the baffle plate 25 will not rotate when the drive shaft 11 rotates. A cavity is formed between the baffle plate 25 and the mounting plate 23. An annular groove 261 is provided in the middle of the sealing sleeve 26. An annular locking block 250 is fixedly provided at one end of the baffle plate 25, and the annular locking block 250 is engaged in the annular groove 261. When the servo motor is working, the drive shaft 11 rotates. The heat generated by the rotation of the drive shaft 11 causes the air in the cavity to expand. The expanded air forms an airtight seal with the sealing sleeve 26. Combined with the seal of the sealing sleeve 26 itself, this creates a double seal, preventing external lubricating oil droplets from entering the baffle plate 25 and thus preventing them from entering the servo motor. The two ends of the sealing sleeve 26 are sloped 264, and each end of the sealing sleeve 26 has an annular placement groove 262. An annular spring 263 is installed in the annular placement groove 262 to strengthen the seal of the sealing sleeve 26 on the drive shaft 11. An annular card 265 is provided on one side of the sealing sleeve 26 with the drive assembly. The cross-section of the card 265 is inclined. Through the interaction between the card 265 and the drive assembly, a third seal is formed.

[0034] The drive assembly includes a rotating block 4, a transmission rod 42, a ball-head post 43, an extrusion block 44, a convex ring 45, a sealing element, and an elastic element. The rotating block 4 is fixedly mounted on the drive shaft 11. A sealing gasket 41 is provided between the rotating block 4 and the inner wall of the housing 2, which on the one hand prevents friction between the rotating block 4 and the housing 2, and on the other hand seals the housing 2. The transmission rod 42 is fixedly mounted on the rotating block 4, and the ball-head post 43 is fixedly mounted on the free end of the transmission rod 42. The convex ring 45 is fixedly mounted on the extrusion block 44 and is sleeved on the drive shaft 11. A track groove 441 is formed on the extrusion block 44. The ball-head post 43 matches the track groove 441. The depth of the track groove 441 gradually decreases from the middle to the end, and the end of the track groove 441 is flush with the outer surface of the extrusion block 44. A receiving cavity is formed between the extrusion block 44 and the baffle plate 25. When the rotating block 4 rotates, it drives the ball head column 43 to rotate. During the rotation, the ball head column 43 can continuously extrude the extrusion block 44, causing the extrusion block 44 to move and enter the receiving cavity, thereby causing the annular card 265 to engage with the inner side of the convex ring 45, further enhancing the sealing effect.

[0035] The sealing element is set on the extrusion block 44, and the elastic element is set between the extrusion block 44 and the connecting ring 251. Through the cooperation of the sealing element and the elastic element, the oil that enters the receiving cavity when the servo motor is not working due to a large amount of oil leakage from the reduction gearbox can be collected, further preventing leakage into the servo motor.

[0036] The sealing component includes a sleeve 252, a first sealing ring 46, and a second sealing ring 461. One end of the sleeve 252 is fixedly mounted on the connecting ring 251. The first sealing ring 46 is fixedly mounted on the extrusion block 44 and located between the extrusion block 44 and the sleeve 252. The second sealing ring 461 has a trapezoidal cross-section and is fixedly connected to the first sealing ring 46. When the servo motor is working, the extrusion block 44 moves towards the bottom of the sleeve 252, causing the receiving cavity to contract. The end of the first sealing ring 46 abuts against the connecting ring 251, and the oil in the receiving cavity is squeezed towards the first sealing ring 46. Due to the obstruction of the second sealing ring 461, the oil in the receiving cavity will not splash, allowing the oil to enter the servo motor from other places.

[0037] The elastic components include a retaining ring 5, a connecting sleeve 51, a spring 52, a connecting rod 53, a sliding block 531, and a limiting ring 54. The retaining ring 5 is fixedly mounted on the pressing block 44. The connecting rod 53 is circumferentially mounted on the retaining ring 5. The sliding block 531 is fixedly mounted on the free end of the connecting rod 53. One end of the connecting sleeve 51 is fixedly mounted on the connecting ring 251 and corresponds to the position of the connecting rod 53. The spring 52 is located inside the connecting sleeve 51, with one end fixedly connected to the bottom of the connecting sleeve 51 and the other end abutting against the sliding block 531. The limiting ring 54 is mounted on the connecting sleeve 51, and the connecting rod 53 passes through the limiting ring 54 to prevent the connecting rod 53 from slipping off the connecting sleeve 51. When the servo motor is not working and the ball joint 43 is located within the track groove 441, the pressing block 44 can reset.

[0038] A fixing block 27 is fixedly installed on the housing 2. A retaining ring 5 has a clearance groove 501 at the position of the fixing block 27, so that the fixing block 27 can pass through the retaining ring 5 when the housing 2 is installed. A drain groove 271 is provided on the fixing block 27, and a through groove 253 is provided on the sleeve 252. The through groove 253 and the drain groove 271 are connected, and the cross-sectional area of ​​the drain groove 271 is larger than the cross-sectional area of ​​the through groove 253, so that the oil in the receiving cavity can completely enter the drain groove 271. A flow groove 201 is provided on the housing 2, and the flow groove 201 is connected to the drain groove 271, so that the oil can enter the flow groove 201 through the drain groove 271. A plug 28, which is transparent, is provided at the end of the flow channel 201. When there is oil in the receiving cavity, the oil can enter the flow channel 201 along the through channel 253 and the drain channel 271 and be blocked by the plug 28. The presence of oil in the flow channel 201 can be checked through the transparent plug 28. If oil is present, it can be detected whether the reduction gearbox is leaking oil or whether the sealing gasket 41 is damaged. The flow channel 201 is inclined, and the oil in the receiving cavity can be released by opening the plug 28, which facilitates maintenance.

[0039] The usage method of this embodiment is as follows: When the servo motor is working, the drive shaft 11 rotates, and the rotation of the drive shaft 11 generates heat, causing the air in the cavity to expand. The expanded air forms an airtight seal with the sealing sleeve 26, which, together with the seal of the sealing sleeve 26 itself, forms a double sealing effect. During the rotation of the drive shaft 11, the rotating block 4 rotates, and the rotation of the rotating block 4 drives the transmission rod 42 and the ball head column 43 to rotate. During the rotation of the ball head column 43, it can continuously squeeze the extrusion block 44, causing the extrusion block 44 to move and enter the receiving cavity, thereby causing the annular card 265 to engage with the inner side of the convex ring 45, further enhancing the sealing effect. The extrusion block 44 squeezes the receiving cavity, causing the oil in the receiving cavity to enter the leakage groove 271 through the through groove 253, and then enter the flow groove 201. During this process, due to the sealing of the first sealing ring 46 and the second sealing ring 461, the oil will not leak out of the extrusion block 44.

[0040] When the servo motor is not working, there are two situations. One is that the ball head post 43 is located in the track groove 441, which opens the receiving cavity. In this case, external oil enters the receiving cavity along the drive shaft 11. Due to the obstruction of the sealing sleeve 26, the oil enters the leakage groove 271 along the through groove 253 under the action of gravity, and then enters the flow groove 201. The other situation is that the ball head post 43 is located on the surface of the extrusion block 44, which makes the extrusion block 44 contain the receiving cavity. The annular card 265 is engaged inside the convex ring 45, so that the drive shaft 11 is sealed by the sealing sleeve 26, the card 265, and the convex ring 45. External oil will not enter the extrusion block 44, so that when the servo motor is working, even if there is external oil leakage, the oil will not enter the servo motor.

[0041] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. An oil-resistant servo motor for CNC machine tools, comprising a motor body and a drive shaft disposed on the motor body, wherein a flange is disposed on the motor body, and the drive shaft extends through the flange, characterized in that: An oil-prevention mechanism is provided on the drive shaft. This mechanism includes a pad, a sealed bearing, an oil-prevention component, a drive assembly, a housing, a connecting block, a mounting plate, and a sealing ring. The sealed bearing is mounted on the drive shaft, the pad is mounted on the outer wall of the sealed bearing, the oil-prevention component is mounted on the pad, the drive assembly is mounted on the drive shaft and is drively connected to the oil-prevention component, the housing is mounted on the pad, the connecting block is circumferentially mounted on the housing, and the connecting block is fixedly connected to the pad. A mounting groove is provided on the flange, the mounting plate is mounted in the mounting groove and fitted onto the outer wall of the housing, and the sealing ring is positioned between the mounting plate and the outer wall of the housing. The drive shaft extends out of the housing. The oil-prevention component includes a mounting plate, a connecting ring, a blocking plate, and a sealing sleeve. The mounting plate is mounted on the outer wall of the sealed bearing, the blocking plate has a tapered cross-section, and the connecting ring is fixedly mounted on the blocking plate. On the outer wall of the baffle, the connecting ring is fixedly connected to the mounting plate, and a cavity is formed between the baffle and the mounting plate. An annular groove is provided in the middle of the sealing sleeve, and an annular block is fixedly provided at one end of the baffle, the annular block being engaged in the annular groove. The drive assembly includes a rotating block, a transmission rod, a ball-head column, a pressing block, a convex ring, a sealing element, and an elastic element. The rotating block is fixedly mounted on the drive shaft, and a sealing gasket is provided between the rotating block and the inner wall of the housing. The transmission rod is fixedly mounted on the rotating block, the ball-head column is fixedly mounted on the free end of the transmission rod, the convex ring is fixedly mounted on the pressing block, the convex ring is sleeved on the drive shaft, a track groove is provided on the pressing block, the ball-head column matches the track groove, a receiving cavity is formed between the pressing block and the baffle, the sealing element is provided on the pressing block, and the elastic element is provided between the pressing block and the connecting ring.

2. The oil-resistant servo motor for CNC machine tools according to claim 1, characterized in that: The sealing sleeve has sloping ends, and annular placement grooves are provided at both ends of the sealing sleeve. Annular springs are provided in the placement grooves. Annular cards are provided on one side of the sealing sleeve and the cross-section of the cards is inclined.

3. The oil-resistant servo motor for CNC machine tools according to claim 2, characterized in that: The depth of the track groove gradually decreases from the middle to the end, and the end of the track groove is flush with the outer surface of the extrusion block.

4. The oil-resistant servo motor for CNC machine tools according to claim 3, characterized in that: The sealing component includes a sleeve, a first sealing ring, and a second sealing ring. One end of the sleeve is fixedly mounted on a connecting ring. The first sealing ring is fixedly mounted on a pressing block and located between the pressing block and the sleeve. The second sealing ring has a trapezoidal cross-section and is fixedly connected to the first sealing ring.

5. The oil-resistant servo motor for CNC machine tools according to claim 4, characterized in that: The elastic element includes a retaining ring, a connecting sleeve, a spring, a connecting rod, a sliding block, and a limiting ring. The retaining ring is fixedly mounted on the compression block. The connecting rod is circumferentially mounted on the retaining ring. The sliding block is fixedly mounted on the free end of the connecting rod. One end of the connecting sleeve is fixedly mounted on the connecting ring and corresponds to the position of the connecting rod. The spring is disposed inside the connecting sleeve. One end of the spring is fixedly connected to the bottom of the connecting sleeve, and the other end abuts against the sliding block. The limiting ring is disposed on the connecting sleeve, and the connecting rod passes through the limiting ring.

6. The oil-resistant servo motor for CNC machine tools according to claim 5, characterized in that: A fixing block is fixedly installed on the housing. A clearance groove is provided on the retaining ring at the position of the fixing block. A leakage groove is provided on the fixing block. A through groove is provided on the sleeve. The through groove and the leakage groove are connected, and the cross-sectional area of ​​the leakage groove is larger than that of the through groove. A flow groove is provided on the housing. The flow groove is connected to the leakage groove. A plug is provided at the end of the flow groove. The plug is transparent.

7. The oil-resistant servo motor for CNC machine tools according to claim 6, characterized in that: The flow channel is inclined.

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