Inner hole wall polishing device for automobile transmission production

Abstract

The invention relates to the field of automobile transmission machining, in particular to an inner hole wall polishing device for automobile transmission production, which comprises a shell and a shell cover, the shell and the shell cover are fixedly mounted, a control system is mounted in the shell, and a polishing cylinder is rotatably connected to one side, far away from the shell, of the shell cover in a penetrating manner. Centrifugal force generated by high-speed rotation of the grinding cylinder drives the multiple sets of grinding heads to adjust the extending amount in a radial self-adaptive mode, the grinding requirements of different hole diameters can be met, the grinding heads do not need to be replaced frequently, and the continuous operation efficiency is improved. And the grinding heads which are uniformly distributed in the circumferential direction are adopted for full-circumferential fit grinding, so that out-of-tolerance of roundness and cylindricity caused by a single grinding head is avoided, and the dimensional accuracy of the inner hole is ensured. The chip collecting channel is synchronously opened during grinding, chips are sucked in and discharged in real time through negative pressure airflow, grinding and cleaning are carried out at the same time, the chips are effectively prevented from scratching the inner hole wall, the surface quality and the form and position precision are guaranteed, poor assembly and abnormal operation sound are reduced, and the assembly qualification rate and the operation stability of a gearbox are improved.

Description

Technical Field

[0001] This invention relates to the field of automotive transmission processing, and more specifically to an internal hole wall grinding device for automotive transmission production. Background Technology

[0002] The transmission is a core component of a car's powertrain system. Its assembly precision, transmission stability, operating noise, and service life directly determine the vehicle's power performance, handling quality, and fuel economy. During the transmission manufacturing process, after roughing and finishing the inner bore through drilling and boring, especially after heat treatment, the inner bore wall is prone to machining deformation, oxide scale, burrs, and microscopic tool marks. These require precision finishing through a grinding process to correct machining errors, eliminate surface defects, and improve the surface quality of the inner bore wall to meet subsequent assembly and usage requirements.

[0003] In patent application CN222493403U, published on February 18, 2025, entitled "A Grinding Device," this invention discloses a grinding device, including a clamping mechanism for loading a workpiece with a hole; a grinding mechanism located on one side of the clamping mechanism, comprising a grinding element for extending into the hole on the workpiece and rotating in a preset direction to grind the inner wall of the hole; a feeding mechanism connected to the grinding mechanism for driving the grinding mechanism closer to or away from the workpiece to adjust the entry and exit of the grinding element from the hole on the workpiece; and a rotating mechanism located on the other side of the clamping mechanism for connecting the workpiece and driving the workpiece to rotate in a direction opposite to the preset direction to cooperate with the grinding mechanism in grinding the inner wall of the hole. The above-mentioned grinding device, by driving the grinding element closer to or away from the workpiece through the feeding mechanism, controls the depth of grinding of the hole on the workpiece by the grinding element, thereby reducing the grinding difficulty, ensuring the required grinding depth of the hole wall, and improving grinding accuracy.

[0004] In the aforementioned patents or prior art, during the grinding operation of the gearbox inner hole, the high-speed rotation of the grinding mechanism generates a large amount of metal burrs and grinding debris. These debris can easily cause secondary scratches on the inner wall of the hole as the grinding mechanism rotates at high speed, damaging the machining accuracy of the inner hole and affecting the subsequent assembly accuracy. At the same time, the inner hole diameters of different models and even the same model of gearbox vary greatly. Existing grinding devices cannot be compatible with the grinding requirements of multiple hole diameters. If a single grinding head is used to feed along the hole wall for grinding, it is easy to cause the inner hole size to exceed the tolerance. Frequent replacement of grinding heads of suitable specifications will significantly reduce the grinding efficiency.

[0005] Therefore, it is necessary to invent an internal hole wall grinding device for automobile gearbox production to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide an inner hole wall grinding device for automobile gearbox production. By using centrifugal adaptive grinding and negative pressure synchronous chip collection structure, it solves the problems in the prior art where the grinding head cannot automatically adapt to the hole diameter, requires frequent replacement leading to low efficiency, and chips easily scratch the inner hole wall, affecting processing accuracy and subsequent assembly.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an inner hole wall grinding device for automobile gearbox production, comprising an outer shell and a cover, wherein the outer shell and the cover are fixedly installed, and a control system is installed inside the outer shell, and a grinding cylinder is rotatably connected through the side of the cover away from the outer shell. The shrinkage assembly installed inside the grinding cylinder includes an inner conical block. The inner conical block is installed on the side of the grinding cylinder away from the shell cover. A limit hole is opened in the inner conical block. A guide shaft is connected through the limit hole. A connecting arm is rotatably connected to one side of the guide shaft. An outer conical block is rotatably connected to one side of the connecting arm. The inclined surface of the outer conical block is in contact with the inclined inner wall of the inner conical block. The grinding assembly disposed on the surface of the grinding cylinder includes a tapered hole, the tapered hole being opened on the surface of the grinding cylinder, a connecting hole being opened on the inner wall of the tapered hole, and the connecting hole extending into the interior of the grinding cylinder, and a grinding head being disposed in the connecting hole; The drive assembly housed within the outer casing and the cover includes two sets of partitions, which are respectively installed inside the outer casing and the cover. A drive motor is installed on one side of the partition inside the outer casing and is electrically connected to the control system inside the outer casing. A drive gear is installed on one side of the partition inside the cover and is axially connected to the output end of the drive motor. A gear ring is fitted and fixed to the portion of the grinding cylinder located inside the cover, and the gear ring meshes with the drive gear.

[0008] As a preferred embodiment of the present invention, the connecting arms are provided in four groups and arranged in a ring, and an outer conical block is installed on one side of each group of connecting arms. Limiting blocks are symmetrically installed on the guide shaft, and the limiting blocks are slidably connected to the inner wall of the limiting hole.

[0009] As a preferred embodiment of the present invention, a guide frame is installed on the inner wall of the grinding cylinder, and the guide frame is connected through the side of the guide shaft away from the inner conical block. Multiple sets of conical rings are sequentially sleeved and fixed on the guide shaft.

[0010] As a preferred embodiment of the present invention, a limiting ring is sleeved and fixed on the guide shaft, and the limiting ring is located inside the limiting hole on the side near the shell cover.

[0011] As a preferred embodiment of the present invention, a spring is sleeved on the guide shaft, and the two ends of the spring are respectively attached to the limiting ring and the inner wall of the limiting hole.

[0012] As a preferred embodiment of the present invention, the conical holes are arranged in a ring and multiple sets are opened sequentially, and each set of conical holes is provided with a connecting hole, and each set of connecting holes is provided with a grinding head. The grinding cylinder is provided with fan-shaped plates arranged in a ring, and each set of fan-shaped plates is sealed and fitted together, and multiple sets are arranged sequentially along the inside of the grinding cylinder.

[0013] As a preferred embodiment of the present invention, an outer conical block II is installed on one side of each group of fan-shaped plates, and the inclined surface of each group of outer conical blocks II is in contact with the inclined inner wall of the corresponding conical ring. A connecting rod is installed on the side of the fan-shaped plate away from the outer conical block II, and the connecting rod is fixedly connected to the corresponding grinding head.

[0014] As a preferred embodiment of the present invention, multiple sets of sealing rings are sequentially installed on the inner wall of the grinding cylinder, and the sealing rings are sealed and fitted with the corresponding sector plates, and the sector plates and each set of sector plates cover the inside of the grinding cylinder.

[0015] As a preferred embodiment of the present invention, a docking cylinder is installed on one side of the partition inside the shell cover, and the docking cylinder communicates with the interior of the grinding cylinder; a connecting pipe is installed on one side of the partition inside the outer shell.

[0016] As a preferred embodiment of the present invention, one end of the connecting pipe is connected to a connecting pipe, and the connecting pipe is connected to a negative pressure fan hose, and the other end of the connecting pipe is connected to a docking cylinder pipe.

[0017] Compared with the prior art, the technical effects and advantages provided by the present invention in the above technical solution are as follows: 1. The centrifugal force generated by the high-speed rotation of the grinding cylinder can simultaneously drive multiple grinding heads to adaptively adjust their extension along the radial direction. This allows for direct matching of grinding requirements for inner holes of different sizes, eliminating the need for frequent grinding head changes for different hole diameters. This significantly reduces the auxiliary time for tooling changes and greatly improves the efficiency of continuous grinding operations for gearbox inner holes. At the same time, it replaces the traditional grinding mode where a single grinding head moves along the hole wall. By having multiple circumferentially distributed grinding heads simultaneously adhere to the inner hole wall for full-circumference grinding, it effectively avoids the problems of out-of-tolerance roundness and cylindricity of inner holes that are easily caused by single grinding head operation. This ensures the consistency of dimensions in all areas of the inner hole and greatly improves the machining accuracy of gearbox inner holes. 2. While the grinding head extends radially to perform the grinding operation, the chip collection channel inside the grinding cylinder is opened simultaneously. The continuous negative pressure airflow generated by the negative pressure fan can draw metal chips and dust generated during the grinding process into the inner cavity of the grinding cylinder in real time and transport them to the external collection mechanism. This achieves real-time and thorough cleaning of grinding chips, fundamentally avoiding the problem of grinding chips remaining in the inner hole and scratching the machined inner hole wall as the grinding head rotates. This effectively ensures the surface quality and dimensional accuracy of the inner hole wall, and eliminates subsequent gearbox parts assembly defects and abnormal operating noises caused by inner hole scratches and out-of-tolerance precision. This significantly improves the assembly qualification rate and operational stability of gearbox products. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the shell planing structure of the present invention; Figure 3 This is a schematic diagram of the planing structure of the grinding cylinder of the present invention; Figure 4 This is a schematic diagram of the mating structure of the outer conical block and the inner conical block of the present invention; Figure 5 This is a schematic diagram of the layout structure of the outer conical block of the present invention; Figure 6 This is a schematic diagram of the connection structure between the guide shaft and the conical ring of the present invention; Figure 7 This is a schematic diagram of the connection structure between the sector plate and the grinding head of the present invention; Figure 8 This is a schematic diagram of the outer conical block structure of the present invention; Figure 9 This is a schematic diagram of the layout structure of the sector plate of the present invention; Figure 10 This is a schematic diagram of the mating structure of the drive gear and gear ring of the present invention; Figure 11 For the present invention Figure 3 Enlarged structural diagram at point A in the middle; Figure 12 For the present invention Figure 3 Enlarged structural diagram at point B.

[0020] Explanation of reference numerals in the attached figures: 001. Outer shell; 101. Shell cover; 102. Grinding cylinder; 002. Shrinkage assembly; 201. Guide frame; 202. Guide shaft; 203. Conical ring; 204. Inner conical block; 205. Limiting hole; 206. Limiting block; 207. Limiting ring; 208. Spring; 209. Outer conical block one; 210. Connecting arm; 003. Grinding assembly; 301. Conical hole; 302. Connecting hole; 303. Grinding head; 304. Connecting rod; 305. Sector plate; 306. Outer conical block two; 307. Sealing ring; 004. Drive assembly; 401. Partition plate; 402. Drive motor; 403. Drive gear; 404. Gear ring; 405. Docking cylinder; 406. Connecting pipe; 407. Docking pipe. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0022] This invention provides, for example Figure 1-12 The device shown is an inner hole wall grinding device for automobile gearbox production, including a housing 001 and a housing cover 101. The housing 001 and the housing cover 101 are fixedly installed, and a control system is installed inside the housing 001. A grinding cylinder 102 is rotatably connected through the side of the housing cover 101 away from the housing 001. The outer shell 001 and the cover 101 are spliced ​​together to form a closed protective cavity, which provides a stable installation benchmark and airtight protection for the electrical and transmission components inside the device, preventing grinding debris and dust from entering and causing damage to components and short circuits. At the same time, the grinding cylinder 102 serves as a rotating bearing base for grinding operations. Its cantilever structure can directly extend into the inner hole to be processed in the gearbox parts, providing a core working carrier for grinding the inner hole wall.

[0023] The shrinkage assembly 002 disposed inside the grinding cylinder 102 includes an inner conical block 204. The inner conical block 204 is installed inside the grinding cylinder 102 on the side away from the shell cover 101. A limiting hole 205 is provided in the inner conical block 204. A guide shaft 202 is connected through the limiting hole 205. A connecting arm 210 is rotatably connected to one side of the guide shaft 202. An outer conical block 209 is rotatably connected to one side of the connecting arm 210. The inclined surfaces of the outer conical block 209 are all in contact with the inclined inner wall of the inner conical block 204. The limiting hole 205 inside the inner conical block 204 provides precise axial sliding limit and radial guidance for the guide shaft 202, preventing radial movement of the guide shaft 202 during operation. When the grinding cylinder 102 rotates at high speed with the drive assembly 004, the outer conical block 209 moves radially outward along the inclined inner wall of the inner conical block 204 under the action of centrifugal force. Then, through the hinged connecting arm 210, the guide shaft 202 is pulled to make linear displacement along the axial direction of the limiting hole 205, realizing the linkage control of the axial feed and reset of the guide shaft 202. Moreover, the centrifugal force drive can adaptively adjust the displacement of the guide shaft 202 according to the rotation speed of the grinding cylinder 102, adapting to different grinding feed requirements.

[0024] The grinding assembly 003 disposed on the surface of the grinding cylinder 102 includes a tapered hole 301, the tapered hole 301 is opened on the surface of the grinding cylinder 102, a connecting hole 302 is opened on the inner wall of the tapered hole 301, and the connecting hole 302 extends into the interior of the grinding cylinder 102, and a grinding head 303 is disposed in the connecting hole 302. The tapered hole 301 and the connecting hole 302 on the surface of the grinding cylinder 102 form a complete channel connecting the inner and outer cavities of the grinding cylinder 102, while providing a radially sliding mounting position and precise guidance for the grinding head 303. When the grinding cylinder 102 rotates at high speed, the grinding head 303 extends radially outward along the connecting hole 302 under the action of centrifugal force, so that the grinding working surface of the grinding head 303 is in close contact with the inner wall of the hole to be processed, realizing the precision grinding operation of the inner wall of the hole. At the same time, after the grinding head 303 extends outward, the tapered inner cavity of the tapered hole 301 forms a flow channel connecting the inside and outside of the grinding cylinder 102, providing a flow path for metal chips generated during the grinding operation to enter the inner cavity of the grinding cylinder 102, and avoiding chips remaining in the inner hole and causing scratches on the ground surface.

[0025] The drive assembly 004, located within the housing 001 and the cover 101, includes two sets of partitions 401. The two sets of partitions 401 are respectively installed inside the housing 001 and the cover 101. A drive motor 402 is installed on one side of the partition 401 inside the housing 001, and the drive motor 402 is electrically connected to the control system inside the housing 001. A drive gear 403 is installed on one side of the partition 401 inside the cover 101, and the drive gear 403 is axially connected to the output end of the drive motor 402. A gear ring 404 is sleeved and fixed on the part of the grinding cylinder 102 located inside the cover 101, and the gear ring 404 meshes with the drive gear 403.

[0026] The drive motor 402 receives commands from the control system inside the housing 001 and outputs rotational power, which drives the drive gear 403 to rotate synchronously. Through the meshing transmission between the drive gear 403 and the gear ring 404, the power is stably transmitted to the grinding cylinder 102, driving the grinding cylinder 102 to rotate at a constant speed around its own axis, providing stable rotational power for the grinding operation. At the same time, the gear meshing transmission method can ensure the transmission accuracy and torque transmission stability, avoid speed fluctuations during the grinding process, and ensure the grinding accuracy and surface roughness consistency of the inner hole wall.

[0027] Furthermore, in the above structure, there are four sets of connecting arms 210 arranged in a ring, and each set of connecting arms 210 has an outer conical block 209 installed on one side. Limiting blocks 206 are symmetrically installed on the guide shaft 202, and the limiting blocks 206 are slidably connected to the inner wall of the limiting hole 205.

[0028] By means of four sets of connecting arms 210 arranged in a ring and an outer conical block 209, a uniform axial tensile force can be generated on the guide shaft 202 under the action of centrifugal force, so as to avoid the problem of uneven wear and jamming of the guide shaft 202 under unidirectional force, and ensure the force balance of the axial sliding of the guide shaft 202; at the same time, the symmetrically arranged limiting blocks 206 on the guide shaft 202 form a sliding limiting fit with the inner wall of the limiting hole 205, which can further limit the radial movement and circumferential rotation of the guide shaft 202, and ensure the straightness and running stability of the axial sliding of the guide shaft 202.

[0029] Furthermore, in the above structure, a guide frame 201 is installed on the inner wall of the grinding cylinder 102, and the guide frame 201 is connected through the side of the guide shaft 202 away from the inner conical block 204. Multiple sets of conical rings 203 are sequentially sleeved and fixed on the guide shaft 202.

[0030] The guide frame 201, fixed to the inner wall of the grinding cylinder 102, forms a through-sliding fit with the guide shaft 202, providing dual-point guide support for the axial sliding of the guide shaft 202. It also forms a two-point limiting structure with the limiting hole 205 of the inner conical block 204, which greatly improves the coaxiality and displacement accuracy of the guide shaft 202. At the same time, multiple sets of conical rings 203, which are sleeved and fixed on the guide shaft 202, can move axially synchronously with the guide shaft 202, providing synchronous linkage triggering power for the radial feed of multiple grinding heads 303, ensuring the consistency of the feed action of each grinding head 303, and avoiding the problem of uneven grinding feed.

[0031] Furthermore, in the above structure, a limiting ring 207 is sleeved and fixed on the guide shaft 202, and the limiting ring 207 is located inside the limiting hole 205 on the side near the cover 101.

[0032] The limiting ring 207 fixed on the guide shaft 202 can slide synchronously along the limiting hole 205 with the guide shaft 202, which not only provides stable abutment support for the subsequent compression and reset of the spring 208, but also forms a hard limit on the maximum axial displacement of the guide shaft 202, avoiding the guide shaft 202 from sliding beyond its travel and causing component collision damage, thus improving the safety of the device operation.

[0033] Furthermore, in the above structure, a spring 208 is sleeved on the guide shaft 202, and the two ends of the spring 208 are respectively attached to the inner wall of the limiting ring 207 and the limiting hole 205.

[0034] When the guide shaft 202 is fed axially, the limiting ring 207 can axially compress the spring 208, storing elastic potential energy. When the grinding cylinder 102 stops rotating and the centrifugal force disappears, the spring 208 releases its elastic potential energy to push the limiting ring 207 and the guide shaft 202 to move axially in opposite directions, realizing the automatic reset of the guide shaft 202. This, in turn, drives the grinding head 303 to automatically retract into the inner cavity of the grinding cylinder 102, which not only avoids collision damage between the grinding head 303 and the workpiece, but also facilitates the smooth insertion and withdrawal of the grinding cylinder 102 into the inner hole to be processed, improving the convenience of the device operation.

[0035] Furthermore, in the above structure, multiple sets of tapered holes 301 are arranged in a ring, and each set of tapered holes 301 is provided with a connecting hole 302. A grinding head 303 is provided in each set of connecting holes 302. Fan-shaped plates 305 are arranged in a ring inside the grinding cylinder 102, and each set of fan-shaped plates 305 is sealed and fitted together. Multiple sets are arranged in sequence along the inside of the grinding cylinder 102.

[0036] Through multiple sets of annularly distributed conical holes 301, connecting holes 302, and grinding heads 303, a circumferentially covered grinding working surface can be formed when the grinding cylinder 102 rotates, ensuring the uniformity of circumferential grinding of the inner hole wall to be processed and avoiding grinding blind spots; at the same time, multiple sets of fan-shaped plates 305 arranged circumferentially inside the grinding cylinder 102 seal and fit together in a static state, which can form a closed isolation of the inner cavity of the grinding cylinder 102, preventing dust and impurities from entering the interior of the grinding cylinder 102 and causing channel blockage when not in operation, thus ensuring the long-term reliability of the device.

[0037] Furthermore, in the above structure, each group of sector plates 305 is equipped with an outer conical block 306 on one side, and the inclined surface of each group of outer conical blocks 306 is in contact with the inclined inner wall of the corresponding conical ring 203. A connecting rod 304 is installed on the side of the sector plate 305 away from the outer conical block 306, and the connecting rod 304 is fixedly connected to the corresponding grinding head 303.

[0038] The conical ring 203, which moves synchronously with the guide shaft 202, releases the radial limit of the outer conical block 306 during axial feeding. This allows the outer conical block 306 to drive the connecting rod 304 and the grinding head 303 to move radially outward synchronously under centrifugal force, achieving adaptive feeding of the grinding head 303 and ensuring stable contact between the grinding head 303 and the inner wall. Simultaneously, when the grinding head 303 extends radially, the connecting rod 304 can drive the sector plate 305 to move radially synchronously, forming a flow gap between the originally closed sector plates 305 to allow for chip flow. This opens the chip collection channel in the inner cavity of the grinding cylinder 102, providing a smooth flow path for the negative pressure collection of grinding chips. This achieves synchronous linkage between grinding feed and chip collection channel opening, eliminating the need for an additional independent control mechanism.

[0039] Furthermore, in the above structure, multiple sets of sealing rings 307 are sequentially installed on the inner wall of the grinding cylinder 102, and the sealing rings 307 are sealed and fitted with the corresponding sector plates 305, and the sector plates 305 and each set of sector plates 305 cover the inside of the grinding cylinder 102.

[0040] Multiple sets of sealing rings 307 fixed to the inner wall of the grinding cylinder 102 form a sealed fit with the sector plate 305. When the device is stationary and not in operation, the circumferentially closed sector plate 305 can form a complete sealed isolation structure, completely sealing the chip collection channel of the grinding cylinder 102 and preventing external impurities from entering. When grinding is in operation, the gap formed between the sector plate 305 and the sealing ring 307 after the sector plate 305 moves radially can still form an axial limit, preventing the sector plate 305 from axially moving, while ensuring the effective flow area of ​​the chip collection channel, ensuring that grinding debris can smoothly enter the inner cavity of the grinding cylinder 102 for collection.

[0041] Furthermore, in the above structure, a docking cylinder 405 is installed on one side of the partition 401 inside the shell cover 101, and the docking cylinder 405 is in communication with the interior of the grinding cylinder 102. A connecting pipe 406 is installed on one side of the partition 401 inside the outer shell 001.

[0042] The docking cylinder 405, fixed on the inner partition 401 of the shell cover 101, is coaxially connected with the inner cavity of the grinding cylinder 102. It can receive the grinding debris sucked in by the negative pressure in the grinding cylinder 102, and form a stable debris conveying channel through the connecting pipe 406 on the inner partition 401 of the outer shell 001. This enables the smooth transfer of grinding debris from the grinding operation end to the collection end, avoids the accumulation of debris inside the device, and ensures the continuous effectiveness of negative pressure chip collection.

[0043] Furthermore, in the above structure, one end of the connecting pipe 406 is connected to the connecting pipe 407, and the connecting pipe 407 is connected to the negative pressure fan hose, and the other end of the connecting pipe 406 is connected to the connecting cylinder 405 pipe.

[0044] The connecting pipe 407 at the end of the connecting pipe 406 can be quickly connected to the hose of the negative pressure fan, so that the negative pressure suction generated by the negative pressure fan can be transmitted to the inner cavity of the grinding cylinder 102 through the connecting pipe 406 and the connecting cylinder 405. During the grinding operation, a continuous negative pressure airflow is formed, which quickly sucks the metal chips and dust generated during grinding into the inner cavity of the grinding cylinder 102 and transports them to the external collection device, realizing simultaneous dust removal and chip collection during the grinding operation, effectively improving the working environment, while avoiding chips from scratching the machined surface of the workpiece and improving the workpiece processing quality.

[0045] like Figure 1-12 As shown, when grinding the inner wall of an automotive gearbox part is required, hold the handle below the housing 001 and smoothly insert the cantilever end of the grinding cylinder 102 of this device into the inner hole to be processed in the gearbox part to complete the alignment preparation before the operation.

[0046] Then, after pressing the start switch and starting the device, the control system inside the housing 001 sends a running command to the drive motor 402 of the drive assembly 004. The drive motor 402 starts and outputs rotational power, driving the drive gear 403 connected to the output shaft to rotate synchronously. Through the meshing transmission between the drive gear 403 and the gear ring 404 fixedly sleeved on the grinding cylinder 102, the rotational power is stably transmitted to the grinding cylinder 102, driving the grinding cylinder 102 to rotate at high speed around its own axis, providing the core rotational power for the grinding operation.

[0047] When the grinding cylinder 102 rotates at high speed, the outer conical block 209 of its internal shrinkage assembly 002 is subjected to centrifugal force and moves radially outward along the inclined inner wall of the inner conical block 204. The radially displaced outer conical block 209 forms an axial pulling force on the guide shaft 202 through the hinged connecting arm 210, pulling the guide shaft 202 to slide precisely axially along the limiting hole 205 and the guide frame 201 towards the housing cover 101. During this process, the guide shaft 202... The symmetrically arranged limiting blocks 206 cooperate with the inner wall of the limiting hole 205 to ensure the stability of the sliding of the guide shaft 202. The limiting ring 207 fixed on the guide shaft 202 moves axially in sync, which compresses the spring 208 sleeved on the guide shaft 202 and stores elastic restoring potential energy. At the same time, the multiple sets of conical rings 203 sleeved on the guide shaft 202 move axially in sync with the guide shaft 202, gradually releasing the radial limitation on the outer conical block 306 in the grinding assembly 003.

[0048] Subsequently, under the action of centrifugal force, the outer conical block 306, which is released from radial limit, drives the grinding head 303 to extend radially outward along the connecting hole 302 on the surface of the grinding cylinder 102 through the connecting rod 304, so that the grinding working surface of the grinding head 303 is in close contact with the inner hole wall to be processed; as the grinding cylinder 102 continues to rotate at high speed, multiple sets of grinding heads 303 evenly arranged in the circumferential direction form a fully covered grinding working surface, and complete a continuous and uniform precision grinding operation on the inner hole wall.

[0049] Meanwhile, as the grinding head 303 extends radially, the connecting rod 304 drives the fan-shaped plate 305 to move radially outward in sync. The fan-shaped plates 305, which were originally sealed together, form a flow gap for the flow of debris, and simultaneously open the chip collection channel in the inner cavity of the grinding cylinder 102. The external negative pressure fan connected to the connecting pipe 407 starts synchronously, and the negative pressure suction generated is transmitted to the inner cavity of the grinding cylinder 102 through the connecting pipe 406 and the connecting cylinder 405 in sequence, forming a continuous negative pressure airflow in the grinding operation area. The metal chips and dust generated during grinding are sucked into the inner cavity of the grinding cylinder 102 through the conical hole 301 and the connecting hole 302, and then transported to the external collection device through the connecting cylinder 405, the connecting pipe 406 and the connecting pipe 407, so as to realize the synchronous operation of grinding and chip collection, and avoid the chips scratching the processed surface and polluting the working environment.

[0050] After the inner wall grinding is completed, the control system stops the drive motor 402, and the grinding cylinder 102 gradually stops rotating, and the centrifugal force completely disappears. At this time, the compressed spring 208 releases its elastic potential energy, pushing the limit ring 207 to drive the guide shaft 202 to slide in the opposite axial direction and return to the initial reset position. During the reset process of the guide shaft 202, the connecting arm 210 pulls the outer conical block 209 to retract radially along the inner wall of the inner conical block 204 to reset, while the conical ring 203 moves with the guide shaft 204. 02 Synchronous reset, pushing the outer conical block 306 and connecting rod 304 to radially retract the grinding head 303, so that the grinding head 303 is completely retracted into the connecting hole 302; the sector plate 305 also resets synchronously with the connecting rod 304, re-sealing and fitting together, and forming a sealing fit with the sealing ring 307 on the inner wall of the grinding cylinder 102, sealing the inner cavity of the grinding cylinder 102 again, completing the entire grinding operation cycle. At this time, the grinding cylinder 102 can be smoothly withdrawn from the inner hole of the workpiece without bumping.

[0051] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A grinding device for the inner wall of an automotive gearbox, comprising a housing (001) and a cover (101), characterized in that: The outer shell (001) and the cover (101) are fixedly installed, and a control system is installed inside the outer shell (001). A grinding cylinder (102) is rotatably connected through the side of the cover (101) away from the outer shell (001). The shrinkage assembly (002) disposed inside the grinding cylinder (102) includes an inner conical block (204). The inner conical block (204) is installed on the side of the grinding cylinder (102) away from the shell cover (101). A limiting hole (205) is provided in the inner conical block (204). A guide shaft (202) is connected through the limiting hole (205). A connecting arm (210) is rotatably connected to one side of the guide shaft (202). An outer conical block (209) is rotatably connected to one side of the connecting arm (210). The inclined surfaces of the outer conical block (209) are all in contact with the inclined inner wall of the inner conical block (204). The grinding assembly (003) disposed on the surface of the grinding cylinder (102) includes a tapered hole (301), the tapered hole (301) being opened on the surface of the grinding cylinder (102), a connecting hole (302) being opened on the inner wall of the tapered hole (301), and the connecting hole (302) extending into the interior of the grinding cylinder (102), and a grinding head (303) being disposed in the connecting hole (302). The drive assembly (004) disposed in the outer shell (001) and the cover (101) includes two sets of partitions (401). The two sets of partitions (401) are respectively installed in the outer shell (001) and the cover (101). A drive motor (402) is installed on one side of the partition (401) in the outer shell (001), and the drive motor (402) is electrically connected to the control system in the outer shell (001). A drive gear (403) is installed on one side of the partition (401) in the cover (101), and the drive gear (403) is axially connected to the output end of the drive motor (402). A gear ring (404) is sleeved and fixed on the part of the grinding cylinder (102) located in the cover (101), and the gear ring (404) meshes with the drive gear (403).

2. The inner hole wall grinding device for automobile gearbox production according to claim 1, characterized in that: The connecting arms (210) are provided in four groups and are arranged in a ring. Each group of connecting arms (210) has an outer conical block (209) installed on one side. Limiting blocks (206) are symmetrically installed on the guide shaft (202), and the limiting blocks (206) are slidably connected to the inner wall of the limiting hole (205).

3. The inner hole wall grinding device for automobile gearbox production according to claim 1, characterized in that: A guide frame (201) is installed on the inner wall of the grinding cylinder (102), and the guide frame (201) is connected through the guide shaft (202) on the side away from the inner conical block (204). Multiple sets of conical rings (203) are sequentially sleeved and fixed on the guide shaft (202).

4. The inner hole wall grinding device for automobile gearbox production according to claim 3, characterized in that: A limiting ring (207) is fixedly sleeved on the guide shaft (202), and the limiting ring (207) is located inside the limiting hole (205) on the side near the shell cover (101).

5. The inner hole wall grinding device for automobile gearbox production according to claim 4, characterized in that: A spring (208) is sleeved on the guide shaft (202), and the two ends of the spring (208) are respectively attached to the inner wall of the limiting ring (207) and the limiting hole (205).

6. The inner hole wall grinding device for automobile gearbox production according to claim 1, characterized in that: The conical holes (301) are arranged in a ring and multiple sets are opened sequentially. Each set of conical holes (301) is provided with a connecting hole (302), and each set of connecting holes (302) is provided with a grinding head (303). The grinding cylinder (102) is provided with fan-shaped plates (305) arranged in a ring. Each set of fan-shaped plates (305) is sealed and fitted together, and multiple sets are arranged sequentially along the inside of the grinding cylinder (102).

7. The inner hole wall grinding device for automobile gearbox production according to claim 6, characterized in that: Each group of fan-shaped plates (305) is equipped with an outer conical block two (306) on one side, and the inclined surface of each group of outer conical block two (306) is in contact with the inclined inner wall of the corresponding conical ring (203). A connecting rod (304) is installed on the side of the fan-shaped plate (305) away from the outer conical block two (306), and the connecting rod (304) is fixedly connected to the corresponding grinding head (303).

8. The internal bore wall grinding device for automobile gearbox production according to claim 1, characterized in that: Multiple sets of sealing rings (307) are sequentially installed on the inner wall of the grinding cylinder (102), and the sealing rings (307) are sealed and fitted with the corresponding sector plates (305), and the sector plates (305) and each set of sector plates (305) cover the inside of the grinding cylinder (102).

9. The inner hole wall grinding device for automobile gearbox production according to claim 1, characterized in that: A docking cylinder (405) is installed on one side of the partition (401) inside the shell cover (101), and the docking cylinder (405) is connected to the interior of the grinding cylinder (102). A connecting pipe (406) is installed on one side of the partition (401) inside the outer shell (001).

10. The internal hole wall grinding device for automobile gearbox production according to claim 9, characterized in that: One end of the connecting pipe (406) is connected to the connecting pipe (407), and the connecting pipe (407) is connected to the negative pressure fan hose, and the other end of the connecting pipe (406) is connected to the connecting tube (405) pipe.

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