A device and method for precision machining of crankshaft gears in automobile engines.

Abstract

This invention discloses a device and method for precision machining of crankshaft gears in automobile engines, comprising: a machining base, with an operating box fixedly mounted on the top of the machining base. This invention relates to the field of precision machining technology for crankshaft gears. This device and method for precision machining of crankshaft gears in automobile engines, through the cooperation of a placement cam, an insert inner rod, a gear inner liner, a hydraulic rod, a gear grinding mechanism, and a reduction servo motor, can achieve efficient and high-precision machining of the gear grooves of multiple crankshaft gear models. The gear inner liner and the insert inner rod can quickly center and clamp crankshaft gears of different inner diameters, ensuring coaxiality with the placement cam. The gear grinding mechanism can be adjusted to accommodate multiple specifications of crankshaft gears, adaptively adjusting the gear groove inclination angle to improve surface quality and forming accuracy. The hydraulic rod drives the gear grinding mechanism to grind up and down, and the reduction servo motor drives the workpiece for precise indexing, enabling simultaneous machining of multiple grooves, resulting in high efficiency, good consistency, and strong versatility.

Description

Technical Field

[0001] This invention relates to the field of gear groove finishing technology, specifically to a gear groove finishing device and method for automobile engine crankshaft gears. Background Technology

[0002] The crankshaft gear in an automotive engine is a key driving component of the timing system. It is rigidly connected to the crankshaft and operates synchronously. As a core component of valve train and power transmission, the gear achieves reliable meshing through its precise tooth profile and tooth groove structure, driving the timing chain or gear set to maintain a fixed speed ratio between the camshaft and crankshaft. This ensures precise matching of valve opening and closing with piston movement timing, preventing engine malfunctions caused by misaligned valve timing. In addition, some crankshaft gears can also drive accessories such as oil pumps and fuel pumps. The precision of its tooth profile, the quality of its tooth groove machining, and its coaxiality directly affect the smoothness of engine operation, noise level, and power output efficiency. It is an important basic component for ensuring stable engine operation and continuous power transmission.

[0003] Referring to the patent application with publication number CN222470973U, a gear tooth groove finishing device is disclosed. It has a buckle fixedly installed above the rotating shaft and a limiting plate fixedly installed on the surface of the rotating shaft. When the gear needs to be processed, the gear is placed above the buckle and pressed down, so that the gear falls into the surface of the limiting plate. At this time, the bottom of the buckle will lock the surface of the gear, which can effectively prevent the gear from falling off during the processing and facilitate the installation and removal of the gear.

[0004] A comprehensive analysis of the above-mentioned patents reveals the following shortcomings: Existing gear tooth groove finishing devices and methods for automobile engine crankshaft gears typically perform sequential machining of a single groove of the crankshaft gear, resulting in low efficiency. They also struggle to adapt to the groove inclination angle to simultaneously complete the precision grinding of multiple grooves on the crankshaft gear, failing to meet the high-efficiency finishing requirements of various crankshaft gear models. Consequently, their overall practicality and versatility are poor. Therefore, it is necessary to provide a gear tooth groove finishing device and method for automobile engine crankshaft gears to solve the aforementioned technical problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a gear tooth groove finishing device and method for automobile engine crankshaft gears. It solves the problems that the traditional method of machining single grooves of crankshaft gears sequentially results in low efficiency, difficulty in adapting the groove inclination angle to simultaneously complete the precision grinding of multiple grooves of crankshaft gears, and inability to meet the high-efficiency precision machining requirements of various crankshaft gear models, resulting in poor overall practicality and versatility.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a gear tooth groove finishing device for automobile engine crankshaft gears, comprising: A processing machine base, wherein an operation box is fixedly installed on the top of the processing machine base, a hydraulic rod is fixedly installed on the top of the inner cavity of the operation box, a geared servo motor is fixedly installed on the bottom of the inner cavity of the processing machine base, a rotating shaft is fixedly installed on the output shaft of the geared servo motor, transparent protective doors are provided on the front, back and left and right sides of the operation box, and a central processing unit is fixedly installed on the bottom of the inner cavity of the processing machine base. A placement cam is used to place the crankshaft gear of an automobile engine to be precision machined. The placement cam is rotatably set at the top center of the machining base and located inside the operating box. An insert rod is fixedly set at the top center of the placement cam. A gear inner liner is slidably sleeved on the outside of the insert rod. The top of the rotating shaft rotatably passes through the top of the machining base and is fixedly connected to the bottom center of the placement cam. The tooth groove fine grinding mechanism is used to finely grind and shape the tooth grooves of the crankshaft gear of an automobile engine. The tooth groove fine grinding mechanism is located at the bottom of the hydraulic rod.

[0007] Preferably, the tooth groove fine grinding mechanism includes a support ring located directly above the placement cam, an annular groove being formed at the top of the support ring, a plurality of grinding rod assemblies being evenly arranged around the top of the support ring, and a placement notch being formed on one side of the top of the support ring.

[0008] Preferably, the sidewall of the bearing ring is evenly provided with several graduated grooves, and a connecting plate is fixedly provided between the lower sidewalls of the inner cavity of the bearing ring. The top center of the connecting plate is fixedly connected to the bottom of the hydraulic rod.

[0009] Preferably, each of the grinding rod assemblies includes a slider, which is slidably disposed in an annular groove. A hollow rod is fixedly disposed on the top of the slider, and an adjusting inner rod slides through the interior of the hollow rod. A plurality of adjusting holes are evenly provided on the top of the adjusting inner rod.

[0010] Preferably, a pin passes through the top of the hollow rod and the interior of one of the adjustment holes, and a collar is slidably sleeved on the end of the inner adjusting rod away from the central axis of the bearing ring.

[0011] Preferably, a bolt is threaded through the top of the collar and the top of the adjusting inner rod, a lifting lug is fixedly provided at the bottom of the collar, a counterweight rod is rotatably provided at the lower part of the lifting lug, and vertical grooves are provided on both sides of the counterweight rod.

[0012] Preferably, the counterweight rod is provided with a grinding sleeve on its outer sliding sleeve, and two bolts are threaded through the grinding sleeve on the side away from the bearing ring and the counterweight rod.

[0013] Preferably, both sides of the top of the slider are threaded with abutting bolts, and the bottom of the abutting bolts contacts the bottom of the annular groove.

[0014] Preferably, a pointer is fixedly installed at the bottom of the hollow rod, the pointer is located outside the bearing ring, and several scale grooves are evenly opened on one side wall of the adjusting inner rod.

[0015] This invention also provides a method for finishing the tooth grooves of an automobile engine crankshaft gear, using an automobile engine crankshaft gear tooth groove finishing device, and the specific method includes the following steps: Step 1: Open the transparent protective door and adjust the gear grinding mechanism. Adjust the outer diameter of the gear grinding mechanism to the required value. Then, put the gear inner liner block with the required outer diameter on the outside of the plug-in inner rod. Next, put the rough-machined automobile engine crankshaft gear on the outside of the gear inner liner block. The outer diameter of the gear inner liner block is compatible with the inner diameter of the automobile engine crankshaft gear. Step 2: Then start the hydraulic rod to drive the tooth grinding mechanism to move down. During the downward movement of the tooth grinding mechanism, some tooth grooves of the automobile engine crankshaft gear directly below are ground. Then the hydraulic rod drives the tooth grinding mechanism to move up. The deceleration servo motor works and drives the placement cam to rotate at a set angle through the rotating shaft and then pauses. The automobile engine crankshaft gear rotates at a set angle and then pauses. Step 3: The hydraulic rod drives the gear grinding mechanism to move down again to grind another part of the gear grooves of the automobile engine crankshaft gear. Similarly, the remaining gear grooves of the crankshaft gear are ground in sequence.

[0016] Beneficial effects This invention provides a device and method for precision machining of the tooth grooves of crankshaft gears in automobile engines. Compared with the prior art, it has the following advantages: 1. A device and method for precision machining of crankshaft gear teeth in automobile engines, which, through the cooperation of a placement cam, an insert inner rod, a gear inner liner, a hydraulic rod, a tooth groove precision grinding mechanism, and a geared servo motor, enables efficient and high-precision machining of the tooth grooves of various crankshaft gears. The gear inner liner and the insert inner rod can quickly center and clamp crankshaft gears of different inner diameters, ensuring coaxiality with the placement cam. The tooth groove precision grinding mechanism can be adjusted to accommodate various specifications of crankshaft gears, adaptively adjusting the tooth groove inclination angle to improve surface quality and forming accuracy. The hydraulic rod drives the tooth groove precision grinding mechanism to grind up and down, and the geared servo motor drives the workpiece for precise indexing. Multiple grooves are processed simultaneously, resulting in high efficiency, good consistency, and strong versatility of the device.

[0017] 2. A device and method for precision machining of crankshaft gears in automobile engines, comprising a grinding rod assembly, a placement notch, a gear inner liner, and a hydraulic rod, wherein a placement notch is provided on one side of the bearing ring to facilitate the rapid addition or removal of the grinding rod assembly and mechanism debugging, effectively shortening the device changeover and preparation time, and improving the precision machining efficiency of the gear groove. Multiple sets of grinding rod assemblies can be evenly arranged circumferentially on the bearing ring, and the hydraulic rod can simultaneously complete the precision grinding of multiple gear grooves in a single downward movement, significantly shortening the processing time of a single piece, adapting to the needs of batch continuous production, and significantly improving processing efficiency. With the use of replaceable gear inner liners of different outer diameters and insertable inner rods for positioning, the centering and clamping of crankshaft gears with different inner hole specifications can be quickly achieved, ensuring the coaxiality of the workpiece and the processing mechanism, improving the precision of gear groove machining, eliminating the need for customized special fixtures, reducing tooling investment, simplifying the clamping process, improving the versatility and utilization of the device, and reducing production costs.

[0018] 3. A device and method for precision machining of crankshaft gear teeth in automobile engines, wherein the grinding rod assembly can slide along the annular groove through the mutual cooperation of the annular groove, the grinding sleeve, the first scale groove, and the second scale groove, and the precise positioning is achieved by cooperating with the first scale groove and the pointer, and the spacing between adjacent grinding sleeves can be quickly adjusted to adapt to crankshaft gears with different numbers of teeth. The adjusting inner rod and the hollow rod are radially adjustable through the pin and the adjusting hole, which can adapt to crankshaft gears with different outer diameters. The cooperation of the first scale groove and the second scale groove can achieve dual quantitative adjustment of angle and radial direction, and the grinding sleeve can be quickly replaced to match tooth grooves of different shapes and depths, so that the device can process a variety of products and has strong applicability.

[0019] 4. A device and method for precision machining of crankshaft gear teeth in automobile engines, which utilizes the cooperation between a lifting lug, a collar, a counterweight rod, and a grinding sleeve. The counterweight rod is rotatably connected to the collar via the lifting lug, allowing the grinding sleeve to adaptively deflect with the inclination angle of the tooth groove sidewall when entering the tooth groove, always maintaining contact with the tooth groove contour, avoiding hard contact that could cause scratches on the tooth surface, significantly improving the surface machining quality of the tooth groove. The shape of the grinding sleeve is perfectly matched to the shape of the crankshaft gear tooth groove. During a single downward movement of the hydraulic rod, the precision machining of multiple tooth groove sidewalls can be completed simultaneously, simplifying the machining process and ensuring that the dimensional accuracy and surface roughness of the tooth groove consistently meet the standards.

[0020] Other advantages, objectives, and features of the invention will be set forth in part in the description which follows, and in part will be apparent to those skilled in the art from the following examination, or may be learned from practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0021] Figure 1 This is a perspective view of the present invention; Figure 2 This is a cross-sectional perspective view of the present invention; Figure 3 This is an assembly drawing showing the placement of the cam, hydraulic rod, tooth grinding mechanism, geared servo motor, and rotating shaft in this invention. Figure 4 This is an exploded view of the hydraulic rod and the tooth groove fine grinding mechanism of the present invention; Figure 5 This is an exploded view of the insert inner rod and gear inner liner block of the present invention; Figure 6 This is a perspective view of the tooth groove fine grinding mechanism of the present invention; Figure 7 For the present invention Figure 6 A magnified view of a section at point A in the middle; Figure 8 This is an exploded view of the tooth groove fine grinding mechanism of the present invention; Figure 9 This is a perspective view of the grinding rod assembly of the present invention; Figure 10 This is an exploded view of the grinding rod assembly of the present invention; Figure 11 This is an assembly drawing of the collar and the polished housing of the present invention; Figure 12 This is an exploded view of the collar, counterweight rod, polished sleeve, and bolt two of the present invention; Figure 13 This is a perspective view of the polished casing of the present invention.

[0022] In the diagram: 1. Machining base; 2. Control box; 3. Placement cam; 4. Insertion inner rod; 5. Gear inner liner block; 6. Hydraulic rod; 7. Gear fine grinding mechanism; 71. Bearing ring; 72. Annular groove; 73. Grinding rod assembly; 731. Slider; 732. Hollow rod; 733. Adjustment inner rod; 734. Adjustment hole; 735. Pin; 736. Collar; 737. Bolt one; 738. Counterweight rod; 739. Grinding sleeve; 7310. Bolt two; 7311. Tightening bolt; 7312. Pointer; 7313. Scale groove two; 74. Placement notch; 75. Scale groove one; 76. Connecting plate; 8. Gear servo motor; 9. Rotating shaft; 10. Transparent protective door. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] This invention provides two technical solutions: like Figures 1 to 5 A first embodiment is shown: a gear tooth finishing apparatus for an automobile engine crankshaft gear, comprising: The processing machine base 1 has an operation box 2 fixedly installed on its top. A hydraulic rod 6 is fixedly installed on the top of the inner cavity of the operation box 2. A geared servo motor 8 is fixedly installed on the bottom of the inner cavity of the processing machine base 1. A rotating shaft 9 is fixedly installed on the output shaft of the geared servo motor 8. Transparent protective doors 10 are provided on the front, back and left and right sides of the operation box 2. A central processing unit is fixedly installed on the bottom of the inner cavity of the processing machine base 1. The placement cam 3 is used to place the automobile engine crankshaft gear to be precision machined. The placement cam 3 is rotatably set in the middle of the top of the machining base 1 and located in the operation box 2. The insertion inner rod 4 is fixedly set in the middle of the top of the placement cam 3. The gear inner liner 5 is slidably sleeved on the outside of the insertion inner rod 4. The top of the rotating shaft 9 rotatably passes through the top of the machining base 1 and is fixedly connected to the middle of the bottom of the placement cam 3. The tooth groove fine grinding mechanism 7 is used to finely grind and shape the tooth grooves of the crankshaft gear of the automobile engine. The tooth groove fine grinding mechanism 7 is located at the bottom of the hydraulic rod 6.

[0025] By cooperating with the placement of the cam 3, the insertion inner rod 4, the gear inner liner 5, the hydraulic rod 6, the gear groove fine grinding mechanism 7, and the reduction servo motor 8, high-efficiency and high-precision machining of the gear grooves of various crankshaft gears can be achieved. The gear inner liner 5 and the insertion inner rod 4 can quickly center and clamp crankshaft gears of different inner diameters to ensure coaxiality with the placement of the cam 3. The gear groove fine grinding mechanism 7 can be adjusted to adapt to various specifications of crankshaft gears, adaptively adjusting the groove inclination angle to improve surface quality and forming accuracy. The hydraulic rod 6 drives the gear groove fine grinding mechanism 7 to grind up and down, and the reduction servo motor 8 drives the workpiece to accurately index, enabling simultaneous processing of multiple grooves with high efficiency, good consistency, and strong versatility.

[0026] like Figures 6 to 13The second embodiment is shown, and its main difference from the first embodiment is that: a gear groove finishing device for an automobile engine crankshaft gear, the gear groove grinding mechanism 7 includes a bearing ring 71, which is located directly above the placement cam 3. The top of the bearing ring 71 has an annular groove 72. A plurality of grinding rod assemblies 73 are evenly arranged around the top of the bearing ring 71. A placement notch 74 is opened on one side of the top of the bearing ring 71. A plurality of scale grooves 75 are evenly arranged around the side wall of the bearing ring 71. A connecting plate 76 is fixedly arranged between the lower side walls of the inner cavity of the bearing ring 71. The top center of the connecting plate 76 is fixedly connected to the bottom of the hydraulic rod 6. Each grinding rod assembly 73 includes a slider 731, which is slidably arranged in the annular groove 72. A hollow rod 732 is fixedly arranged on the top of the slider 731. An adjusting inner rod 733 slides through the hollow rod 732. A plurality of adjusting holes 734 are evenly arranged on the top of the adjusting inner rod 733. A pin 735 passes through the top of 2 and the interior of one of the adjustment holes 734. A collar 736 is slidably fitted at the end of the inner adjusting rod 733 away from the central axis of the bearing ring 71. A bolt 737 is threaded through the top of the collar 736 and the top of the inner adjusting rod 733. A lifting lug is fixedly installed at the bottom of the collar 736. A counterweight rod 738 is rotatably installed at the lower part of the lifting lug. Vertical grooves are opened on both sides of the counterweight rod 738. A grinding sleeve is slidably fitted on the outside of the counterweight rod 738. The shell 739 has two bolts 7310 threaded through the side of the polished shell 739 away from the bearing ring 71 and the counterweight rod 738. The top two sides of the slider 731 are threaded through with clamping bolts 7311. The bottom of the clamping bolts 7311 is in contact with the bottom of the annular groove 72. The bottom of the hollow rod 732 is fixedly equipped with a pointer 7312, which is located outside the bearing ring 71. Several scale grooves 7313 are evenly opened on one side wall of the adjusting inner rod 733.

[0027] Through the interaction of the grinding rod assembly 73, the placement notch 74, the gear inner liner 5, and the hydraulic rod 6, the placement notch 74 is opened on one side of the bearing ring 71, which facilitates the rapid addition and removal of the grinding rod assembly 73 and the adjustment of the mechanism, effectively shortening the device changeover and preparation time, and improving the efficiency of gear groove finishing. The bearing ring 71 can evenly arrange multiple sets of grinding rod assemblies 73 along the circumference. The hydraulic rod 6 can complete the finishing grinding of multiple gear grooves simultaneously with a single downward movement, greatly shortening the processing time of a single piece, adapting to the needs of batch continuous production, and significantly improving processing efficiency. It can be used with different replaceable outer... The inner bushing 5 of the radial gear is sleeved and positioned with the inner rod 4, which can quickly achieve centering and clamping of crankshaft gears with different inner hole specifications, ensure the coaxiality of the workpiece and the machining mechanism, improve the machining accuracy of the gear groove, eliminate the need for customized special fixtures, reduce tooling investment, simplify the clamping process, improve the versatility and utilization of the device, and reduce production costs. Through the mutual cooperation between the annular groove 72, the grinding sleeve 739, the first scale groove 75, and the second scale groove 7313, the grinding rod assembly 73 can slide along the annular groove 72, and achieve precise positioning in conjunction with the first scale groove 75 and the pointer 7312. It can quickly adjust the spacing between adjacent grinding sleeves 739 to accommodate crankshaft gears with different numbers of teeth. The adjusting inner rod 733 and hollow rod 732 are radially adjustable via pin 735 and adjusting hole 734, accommodating crankshaft gears with different outer diameters. The first scale groove 75 and the second scale groove 7313 cooperate to achieve dual quantitative adjustment of angle and radial direction. Furthermore, the grinding sleeves 739 can be quickly replaced to match different shapes and depths of tooth grooves, enabling the device to process various types of products. It has strong applicability and is connected via lifting lugs, collars 736, and counterweight rods 738. The counterweight rod 738 and the grinding sleeve 739 are mutually coordinated. The counterweight rod 738 is rotatably connected to the collar 736 through the lifting lug, so that the grinding sleeve 739 can adaptively deflect with the inclination angle of the tooth groove sidewall when entering the tooth groove, and always keep in close contact with the tooth groove contour, avoiding hard contact that causes tooth surface scratches, significantly improving the surface processing quality of the tooth groove. The shape of the grinding sleeve 739 is perfectly matched with the shape of the crankshaft gear tooth groove. During the single downward movement of the hydraulic rod 6, the finishing of multiple tooth groove sidewalls can be completed simultaneously, simplifying the processing procedure and ensuring that the tooth groove dimensional accuracy and surface roughness are consistently up to standard.

[0028] This invention also provides a method for precision machining of the tooth grooves of an automobile engine crankshaft gear, using an automobile engine crankshaft gear tooth groove precision machining device. The specific method includes the following steps: Step 1: Open the transparent protective doors 10 around the control box 2 to ensure a safe and unobstructed operating space, facilitating device adjustment and workpiece installation. Then, adjust the number of grinding rod assemblies 73 according to the number of teeth and tooth groove distribution of the crankshaft gear to be processed. Install the corresponding number of grinding rod assemblies 73 into the annular groove 72 at the top of the bearing ring 71 by placing the notch 74. Next, slide the slider 731 along the annular groove 72 and align the pointer 7312 with the designated scale groove 75 on the side wall of the bearing ring 71 to determine the spacing between adjacent grinding sleeves 739, adapting to part of the tooth groove of the crankshaft gear. After adjustment, tighten the clamping bolt 7311 to complete the positioning. Then, pull out the grinding rod assembly. The pin 735 in part 73 is used to pull the adjusting inner rod 733 and adjust the radial distance from the grinding sleeve 739 to the center axis of the bearing ring 71 in conjunction with the scale groove 7313. When the required value is reached, the pin 735 is inserted to lock the adjusting hole 734. Then, the corresponding grinding sleeve 739 is replaced according to the shape of the tooth groove and slidably sleeved on the outside of the counterweight rod 738. The bolt 7310 is tightened to complete the locking. Next, a gear inner liner 5 matching the inner diameter of the crankshaft gear is selected and sleeved on the outside of the inserting inner rod 4. The rough-machined automobile engine crankshaft gear is sleeved on the outside of the gear inner liner 5 to ensure that the crankshaft gear and the placement cam 3 are concentric and without looseness, so as to achieve precise positioning of the workpiece. Step 2: Close the transparent protective door 10 to form a closed processing space and ensure operational safety. Start the device power supply. The central processing unit controls the hydraulic rod 6 to extend downwards smoothly at a constant speed. The bottom end of the hydraulic rod 6 drives the tooth groove fine grinding mechanism 7 to move vertically downwards at a uniform speed through the connecting plate 76. During the downward movement, the grinding sleeve 739 at the bottom of each grinding rod assembly 73 is precisely aligned with the corresponding tooth groove of the crankshaft gear that has been indexed below, and smoothly embedded into the top of the tooth groove. Because the counterweight rod 738 forms a rotatable hinge structure with the lug and the collar 736, after the bottom of the grinding sleeve 739 is embedded into the tooth groove, the counterweight rod 738 will adaptively deflect in real time according to the side wall inclination angle of the crankshaft gear tooth groove, so that the outer contour of the grinding sleeve 739 always fits against the inner wall of the tooth groove. After the tooth groove contour is formed by high-precision and high-consistency fine grinding, the central processing unit controls the hydraulic rod 6 to retract upward at a uniform speed, which drives the tooth groove fine grinding mechanism 7 to smoothly return to the initial standby height, so that all grinding sleeves 739 are completely separated from the crankshaft gear workpiece. Then the central processing unit triggers the start of the reduction servo motor 8. The reduction servo motor 8 operates precisely according to the preset indexing angle. Its output shaft drives the rotating shaft 9 to rotate synchronously, which in turn drives the placed cam 3 and the crankshaft gear clamped on it to rotate precisely according to the set indexing angle. After the rotation is in place, the reduction servo motor 8 immediately self-locks the brake to keep the crankshaft gear in a locked position, providing stable positioning for the next round of grinding processing, and waiting for the next processing instruction. Step 3: Next, the hydraulic rod 6 extends downwards again at a constant speed, and the gear grinding mechanism 7 performs grinding on the next set of gear teeth of the crankshaft gear. After the grinding is completed, it resets and repeats the process of indexing and positioning, hydraulic feed grinding, and mechanism reset until all the gear teeth of the crankshaft gear are finished. After all the gear teeth are finished, the device automatically stops, the hydraulic rod 6 retracts at a constant speed, driving the gear grinding mechanism 7 to reset to the standby height, the reduction servo motor 8 stops working, the transparent protective door 10 is opened, the finished crankshaft gear is removed, the gear inner liner 5 is removed, the debris inside the device is cleaned, and the protective door is closed. This processing is completed.

[0029] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A gear tooth groove finishing device for automobile engine crankshaft gears, characterized in that, include: A processing machine base (1) is provided with an operation box (2) fixedly installed on the top of the processing machine base (1). A hydraulic rod (6) is fixedly installed on the top of the inner cavity of the operation box (2). A reduction servo motor (8) is fixedly installed at the bottom of the inner cavity of the processing machine base (1). A rotating shaft (9) is fixedly installed on the output shaft of the reduction servo motor (8). Transparent protective doors (10) are provided at the front and rear and on the left and right sides of the operation box (2). A central processing unit is fixedly installed at the bottom of the inner cavity of the processing machine base (1). A placement cam (3) is used to place the crankshaft gear of an automobile engine to be precision machined. The placement cam (3) is rotatably set at the top center of the machining base (1) and located inside the operation box (2). An insert rod (4) is fixedly set at the top center of the placement cam (3). A gear inner liner (5) is slidably sleeved on the outside of the insert rod (4). The top of the rotating shaft (9) rotatably passes through the top of the machining base (1) and is fixedly connected to the bottom center of the placement cam (3). The tooth groove fine grinding mechanism (7) is used to finely grind and shape the tooth grooves of the crankshaft gear of the automobile engine. The tooth groove fine grinding mechanism (7) is located at the bottom of the hydraulic rod (6).

2. The gear groove finishing device for automobile engine crankshaft gears according to claim 1, characterized in that: The tooth grinding mechanism (7) includes a bearing ring (71), which is located directly above the placement cam (3). The top of the bearing ring (71) has an annular groove (72), and a number of grinding rod assemblies (73) are evenly arranged around the top of the bearing ring (71). A placement notch (74) is provided on one side of the top of the bearing ring (71).

3. The gear tooth groove finishing device for automobile engine crankshaft gear according to claim 2, characterized in that: The sidewall of the bearing ring (71) is evenly provided with several graduated grooves (75), and a connecting plate (76) is fixedly provided between the lower sidewalls of the inner cavity of the bearing ring (71). The top middle of the connecting plate (76) is fixedly connected to the bottom of the hydraulic rod (6).

4. The gear tooth groove finishing device for automobile engine crankshaft gear according to claim 2, characterized in that: Each of the grinding rod assemblies (73) includes a slider (731) which is slidably disposed in an annular groove (72). A hollow rod (732) is fixedly disposed on the top of the slider (731). An adjusting inner rod (733) is slidably passed through the interior of the hollow rod (732). A plurality of adjusting holes (734) are evenly provided on the top of the adjusting inner rod (733).

5. The gear tooth groove finishing device for automobile engine crankshaft gear according to claim 4, characterized in that: A pin (735) passes through the top of the hollow rod (732) and the interior of one of the adjustment holes (734), and a collar (736) is slidably sleeved on the end of the inner adjusting rod (733) away from the central axis of the bearing ring (71).

6. The gear tooth groove finishing device for automobile engine crankshaft gear according to claim 5, characterized in that: A bolt (737) is threaded through the top of the collar (736) and the top of the adjusting inner rod (733). A lifting lug is fixedly provided at the bottom of the collar (736), and a counterweight rod (738) is rotatably provided at the lower part of the lifting lug. Vertical grooves are provided on both sides of the counterweight rod (738).

7. The gear tooth groove finishing device for automobile engine crankshaft gear according to claim 6, characterized in that: The counterweight rod (738) is externally slidably fitted with a grinding sleeve (739), and two bolts (7310) are threaded through the side of the grinding sleeve (739) away from the bearing ring (71) and the counterweight rod (738).

8. The gear tooth groove finishing device for automobile engine crankshaft gear according to claim 4, characterized in that: Both sides of the top of the slider (731) are threaded with abutment bolts (7311), and the bottom of the abutment bolts (7311) is in contact with the bottom of the annular groove (72).

9. The gear tooth groove finishing device for automobile engine crankshaft gear according to claim 4, characterized in that: A pointer (7312) is fixedly installed at the bottom of the hollow rod (732). The pointer (7312) is located outside the bearing ring (71). Several scale grooves (7313) are evenly opened on one side wall of the adjusting inner rod (733).

10. A method for precision machining of the tooth grooves of a crankshaft gear in an automobile engine, characterized in that: The method using the gear tooth finishing apparatus for automobile engine crankshaft gears as described in any one of claims 1-9 includes the following steps: Step 1: Open the transparent protective door (10), adjust the gear grinding mechanism (7), adjust the outer diameter of the gear grinding mechanism (7) to the required value, then put the gear inner liner (5) with the required outer diameter on the outside of the plug-in inner rod (4), and then put the rough-machined automobile engine crankshaft gear on the outside of the gear inner liner (5). The outer diameter of the gear inner liner (5) is matched with the inner diameter of the automobile engine crankshaft gear. Step 2: Then start the hydraulic rod (6) to drive the tooth groove fine grinding mechanism (7) to move down. During the downward movement of the tooth groove fine grinding mechanism (7), it grinds part of the tooth groove of the automobile engine crankshaft gear directly below. Then the hydraulic rod (6) drives the tooth groove fine grinding mechanism (7) to move up. The deceleration servo motor (8) works and drives the placement cam (3) to rotate at a set angle through the rotating shaft (9) and then pauses. The automobile engine crankshaft gear rotates at a set angle and then pauses. Step 3: The hydraulic rod (6) drives the tooth groove fine grinding mechanism (7) to move down again to grind another part of the tooth groove of the automobile engine crankshaft gear. Similarly, the remaining tooth grooves of the crankshaft gear are ground in sequence.

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