A forming method and device for quick gear shaping of a balance shaft of a small gasoline engine

Abstract

The present invention discloses a forming device for fast gear shaping of a balance shaft of a small power gasoline engine. Its rotating base drives the balance shaft of the gasoline engine to feed circumferentially. The adjusting handle can adjust the installation angle of the clamp and play a tightening role. The tightening screw is mainly used for axial fixation of the clamp body. The Z-axis steering limit rod is used for circumferential fixation of the balance shaft during the rotation feeding process. The gear shaping cutter head moves up and down quickly and rotates slowly under the control of the feed gearbox body. With the rotation of the balance shaft, the tooth groove, tooth profile and tooth shape are quickly formed. The chip blowing air pipe sprays high-pressure air to discharge the waste chips in real time. The present invention has a wide range of applications and a novel structure, and can simultaneously improve product quality and production efficiency.

Description

Technical Field

[0001] The invention relates to the field of gear shaping fixtures, and in particular to a forming method and a device for fast gear shaping of a balance shaft of a small power gasoline engine. Background Art

[0002] When the engine is in operation, the piston is in a high-speed rotating state, generating a large inertial force. Part of the inertial force is eliminated under the counterweight of the connecting rod, but there is still a part of the inertial force that participates in the rotational motion and cannot be balanced. Therefore, the balance shaft that can eliminate this vibration is an important part of the gasoline engine. It can make the gasoline engine work more smoothly and smoothly, and improve driving comfort. There are two types of balance shafts used in gasoline engines: double balance shafts and single balance shafts. The double balance shaft uses a chain drive to drive the two balance shafts to rotate. The single balance shaft uses a gear drive method to work, and the crankshaft rotates to drive the connected driving gear, driven gear and balance shaft; the single balance shaft can eliminate the first-order vibration that accounts for a large proportion of the entire vibration, and the structure is simple and occupies a small space, so it is widely used in single-cylinder and small-displacement gasoline engines. However, the traditional hobbing method has low precision and large roughness of the formed tooth surface, which cannot meet the service environment requirements of high-speed and high-cycle fatigue of the engine, so it is necessary to use a high-speed gear shaping process with higher forming precision and smaller roughness to process the balance shaft fixed gear. Summary of the invention

[0003] The present invention provides a forming method and device for a quick gear shaping of a balance shaft of a small power gasoline engine, which can meet higher service requirements and processing requirements of a balance shaft consolidation gear with higher shaping accuracy, and has the advantages of simple structure, high positioning accuracy and easy operation.

[0004] The present invention adopts the following technical scheme: A forming device for quick gear insertion of a balance shaft of a small power gasoline engine, which mainly includes a vertical centering clamp assembly and an upper working device from bottom to top, wherein the vertical centering clamp assembly mainly includes a rotating base, an adjustable slide rail, a circular boss, a clamp base boss, a base avoidance groove, a fastening screw, a front limit block, an adjusting knob and a Z-axis steering limit rod, wherein the rotating base is provided with an adjustable slide rail, the clamp base boss and the circular boss are concentrically arranged from top to bottom, the clamp base boss and the circular boss are installed on the rotating base through the adjustable slide rail, the clamp base boss and the circular boss are axially installed and fixed, a positioning hole is provided at the center of the clamp base boss, and the adjusting knob is symmetrically installed on both sides of the clamp base boss, and is used to adjust the knob to adjust the installation angle of the vertical clamp body and play a circumferential tightening role;

[0005] The upper working device mainly includes an upper center, a gear shaping cutter head and a feed gearbox body. The feed gearbox body is connected to the horizontally placed gear shaping cutter head through a vertically downward transmission shaft. An upper center is provided near the gear shaping cutter head. A small-power gasoline engine balance shaft placement area is provided between the upper center and the fixture base boss. The small-power gasoline engine balance shaft is vertically placed in the small-power gasoline engine balance shaft placement area. A Z-axis steering limit rod is installed on the side of the small-power gasoline engine balance shaft. The Z-axis steering limit rod contacts the middle part of the avoidance U-shaped rod of the small-power gasoline engine balance shaft during operation. The Z-axis steering limit rod is mainly used for circumferential limitation of the balance shaft during rotational feeding. The fixture base boss and the upper center on the rotating base jointly limit the axial vibration of the small-power gasoline engine balance shaft and provide circumferential rotation power. The feed gearbox body controls the gear shaping cutter head to perform rapid up and down rotation and slow rotation to quickly form tooth grooves, tooth profiles and tooth shapes on the small-power gasoline engine balance shaft.

[0006] Furthermore, the feed gearbox body is provided with an air inlet duct, the air inlet of the air inlet duct is connected with the air outlet of the air pump, and two air outlets are symmetrically provided on the left and right sides of the air inlet duct, and each air outlet is respectively connected with a chip blowing air pipe, one end of each chip blowing air pipe is connected with the air outlet, and the other end is provided with a blowing nozzle, and the two blowing nozzles are respectively located on both sides of the machining surface of the small power gasoline engine balance shaft. The high-pressure gas is input into the chip blowing air pipe after being taken in by the air inlet duct, and after the high-pressure air is sprayed out from the blowing nozzle, the waste chips on the machining surface of the small power gasoline engine balance shaft can be discharged in real time.

[0007] Furthermore, a plurality of base avoidance grooves are provided on the clamp base boss, and threaded holes for connecting the circular bosses are provided in the base avoidance grooves. Fastening screws are inserted into the threaded holes on the base avoidance grooves to axially fix the clamp base boss and the circular boss, and a front limit block is provided on one side of the base avoidance groove.

[0008] The present invention also provides a method for forming a small-sized gasoline engine balance shaft by rapid gear shaping, which is characterized in that it mainly comprises the following steps:

[0009] Step 1: insert the bottom of the small power gasoline engine balance shaft into the positioning hole provided in the center of the clamp base boss, and then move the top tip downward to fasten with the center positioning hole at the top of the small power gasoline engine balance shaft to complete its axial positioning;

[0010] Step 2: Then adjust the angle of the small power gasoline engine balance shaft so that the Z-axis steering limit rod is in point contact with the middle part of the avoidance U-shaped rod of the small power gasoline engine balance shaft;

[0011] Step three, then rotate the rotating base, the rotating base drives the small power gasoline engine balance shaft to rotate slowly, while the small power gasoline engine balance shaft rotates slowly, the feed gearbox body controls the gear shaping cutter head to move to the position in the processing area specified by the small power gasoline engine balance shaft, the feed gearbox body starts to control the gear shaping cutter head to move up and down quickly and rotate slowly, and then the gear shaping cutter head gradually forms the tooth groove, tooth profile and tooth shape on the surface of the small power gasoline engine balance shaft; during the processing, high-pressure gas is ejected from the blowing nozzle and blown onto the processing surface of the small power gasoline engine balance shaft, and the waste chips on the processing surface of the small power gasoline engine balance shaft are blown out in real time;

[0012] Step 4: After the processing is completed, the gear shaping cutter head stops moving and leaves the surface of the small power gasoline engine balance shaft, and then the base is rotated and stops rotating.

[0013] The present invention has the following beneficial effects: after adopting the above technical scheme, the present invention mainly comprises a base clamp assembly and an upper working device from bottom to top, wherein the base clamp assembly mainly comprises a rotating base, an adjustable slide rail, a circular boss, a clamp base boss, a base avoidance groove, a fastening screw, a front limit block, an adjustment knob and a Z-axis steering limit rod, and the upper working device mainly comprises an upper center, a gear shaping cutter head and a feed gearbox body, so that when in use, the balancing shaft rod portion is inserted into the positioning hole of the vertical clamp body, and then the upper center moves downward and is fastened to the central positioning hole at the other end of the balancing shaft to complete its axial positioning, and then The angle of the balancing shaft is adjusted so that the Z-axis steering limit rod contacts the middle point of the U-shaped rod of the balancing shaft, and then the rotating base drives the balancing shaft to rotate slowly. The feed gearbox controls the gear-slotting cutter head to move to the specified position and starts to move up and down quickly and rotate slowly, gradually forming the tooth groove, tooth profile and tooth shape; after the processing is completed, the gear-slotting cutter head stops moving and leaves the workpiece surface, and then the rotating base stops rotating again, which can meet the higher service requirements and the processing requirements of the balancing shaft fixed gear with higher forming accuracy, and has the advantages of simple structure, high positioning accuracy, easy operation and wide application range. The high-speed gear-slotting process of the present invention has higher forming accuracy and smaller roughness, improves product quality and production efficiency, and the formed balancing shaft fixed gear can well meet the service environment requirements of small gasoline engines with high speed, high temperature, high cycle load and high cyclic stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the vertical clamp structure of the present invention.

[0017] Figure 3 The present invention is a schematic diagram of the structure of a balance shaft of a small power gasoline engine.

[0018] Figure 4 It is a schematic structural diagram of the gear shaping cutter head of the present invention.

[0019] The accompanying drawings are marked with: rotating base 1, adjustable slide rail 2, circular boss 3, clamp base boss 4, base avoidance groove 5, front limit block 6, fastening screw 7, adjusting handle 8, Z-axis steering limit rod 9, small power gasoline engine balance shaft 10, upper center 11, gear shaping cutter head 12, feed gearbox body 13, air inlet duct 14, sealing screw 15, chip blowing air pipe 16, air blowing nozzle 17. DETAILED DESCRIPTION

[0020] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0021] exist Figure 1 , Figure 2 and Figure 3 The present invention provides a forming device for quick gear insertion of a balance shaft of a small power gasoline engine, which mainly includes a vertical centering fixture assembly and an upper working device from bottom to top. The vertical centering fixture assembly mainly includes a rotating base 1, an adjustable slide rail 2, a circular boss 3, a fixture base boss 4, a base avoidance groove 5, a fastening screw 6, a front limit block 7, an adjusting knob 8 and a Z-axis steering limit rod 9. The rotating base 1 is provided with an adjustable slide rail 2, the fixture base boss 4 and the circular boss 3 are concentrically arranged from top to bottom, the fixture base boss 4 and the circular boss 3 are installed on the rotating base 1 through the adjustable slide rail 2, the fixture base boss 4 and the circular boss 3 are axially installed and fixed, a positioning hole is provided at the center of the fixture base boss 4, the adjusting knob 8 is symmetrically installed on both sides of the fixture base boss 4, and is used to adjust the handle 8 to adjust the installation angle of the vertical clamp and play a circumferential tightening role, and a front limit block 7 is provided on one side of the base avoidance groove 5; Figure 4The upper working device mainly includes an upper center 11, a gear shaping cutter head 12 and a feed gearbox body 13. The feed gearbox body 13 is connected to the horizontally placed gear shaping cutter head 12 through a vertically downward transmission shaft. The upper center 11 is provided near the gear shaping cutter head 12. The small power gasoline engine balance shaft placement area is between the upper center 11 and the fixture base boss 4. The small power gasoline engine balance shaft 10 is vertically placed in the small power gasoline engine balance shaft placement area. A Z-axis steering gear is installed on the side of the small power gasoline engine balance shaft 10. The limit rod 9, the Z-axis steering limit rod 9 contacts the middle part of the avoidance U-shaped rod of the small power gasoline engine balance shaft 10 during operation, and the Z-axis steering limit rod 9 is mainly used for the circumferential limit of the balance shaft during the rotation feeding process. The fixture base boss 4 and the upper top 11 on the rotating base 1 jointly limit the axial vibration of the small power gasoline engine balance shaft 10 and provide the power for circumferential rotation. The feed gearbox body 13 controls the gear shaping cutter head 12 to perform rapid up and down rotation and slow rotation movement to quickly form on the small power gasoline engine balance shaft 10. The tooth groove, tooth profile and tooth shape are shown in FIG. 1 . The feed gearbox body 13 of the present embodiment is provided with an air inlet duct 14. The air inlet of the air inlet duct 14 is connected to the air outlet of the air pump. Two air outlets are symmetrically provided on the left and right sides of the air inlet duct 14. A chip blowing air pipe 16 is connected to each air outlet. One end of each chip blowing air pipe 16 is connected to the air outlet, and the other end is provided with an air blowing nozzle 17. The two air blowing nozzles 17 are respectively located on both sides of the machining surface of the small power gasoline engine balance shaft 10. The high-pressure gas is input into the chip blowing air pipe 16 after being sucked in from the air inlet duct 14, and then blown out from the air outlet. After high-pressure air is sprayed out from the air nozzle 17, the waste chips on the machined surface of the small power gasoline engine balance shaft 10 can be discharged in real time. In this embodiment, sealing screws 15 are also distributed on the feed gearbox body 13. Two base avoidance grooves 5 are provided on the clamp base boss 4 of this embodiment, and threaded holes for connecting the circular boss 3 are provided in the base avoidance groove 5. The clamp base boss 4 and the circular boss 3 are axially installed and fixed by inserting a fastening screw into the threaded hole on the base avoidance groove 5, and a front limit block 7 is provided on one side of the base avoidance groove 5.

[0022] The present invention also discloses a method for forming a small-power gasoline engine balance shaft by rapid gear shaping, which mainly includes the following steps: step one, inserting the bottom of the small-power gasoline engine balance shaft 10 into the positioning hole provided in the center of the clamp base boss 4, and then moving the top tip 11 downward to fasten with the center positioning hole at the top of the small-power gasoline engine balance shaft 10 to complete its axial positioning; step two, then adjusting the angle of the small-power gasoline engine balance shaft 10, so that the Z-axis steering limit rod 9 is in point contact with the middle part of the avoidance U-shaped rod of the small-power gasoline engine balance shaft 10; step three, then rotating the rotating base 1, the rotating base 1 drives the small-power gasoline engine balance shaft 10 to rotate slowly, and while the small-power gasoline engine balance shaft 10 rotates slowly, the feed gearbox body 13 controls the gear shaping cutter head 12 to move to the specified position of the small-power gasoline engine balance shaft 10 At the position in the processing area, the feed gearbox body 13 starts to control the gear shaping cutter head 12 to move up and down quickly and rotate slowly, and then the gear shaping cutter head 12 gradually forms the tooth groove, tooth profile and tooth shape on the surface of the small power gasoline engine balance shaft 10; during the processing, the high-pressure gas is ejected from the blowing nozzle 17 and blown to the processing surface of the small power gasoline engine balance shaft 10, and the waste chips on the processing surface of the small power gasoline engine balance shaft 10 are blown out in real time; step four, after the processing is completed, the gear shaping cutter head 12 first stops moving and leaves the surface of the small power gasoline engine balance shaft 10, and then the rotating base 1 stops rotating again. The high-speed gear shaping process of the present invention has higher forming accuracy and smaller roughness, and the formed balance shaft fixed gear can well meet the service environment requirements of high speed, high temperature, high cycle load and high cyclic stress of small gasoline engines.

[0023] The technical solutions provided by the embodiments of the present invention are introduced in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the embodiments of the present invention. The description of the above embodiments is only applicable to help understand the principles of the embodiments of the present invention. At the same time, for those skilled in the art, according to the embodiments of the present invention, there may be changes in the specific implementation methods and application scopes. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for forming a quick gear shaping of a balance shaft of a small power gasoline engine, characterized in that The molding device used in the molding method comprises, from bottom to top, a vertical centering clamp assembly and an upper working device. The vertical centering clamp assembly comprises a rotating base (1), an adjustable slide rail (2), a circular boss (3), a clamp base boss (4), a base avoidance groove (5), a fastening screw (6), a front limit block (7), an adjustment handle (8) and a Z-axis steering limit rod (9). The rotating base (1) is provided with an adjustable slide rail (2). The clamp base boss (4) and the circular boss (3) are concentrically arranged from top to bottom. The clamp base boss (4) and the circular boss (3) are installed on the rotating base (1) through the adjustable slide rail (2). The clamp base boss (4) and the circular boss (3) are installed and fixed in the axial direction. A positioning hole is provided at the center of the clamp base boss (4). The adjustment handle (8) is symmetrically installed on both sides of the clamp base boss (4). The adjustment handle (8) is used to adjust the installation angle of the vertical clamp body and plays a circumferential tightening role. The upper working device comprises an upper center (11), a gear shaping cutter head (12) and a feed gearbox body (13). The feed gearbox body (13) is connected to the horizontally placed gear shaping cutter head (12) through a transmission shaft extending vertically downward. The upper center (11) is provided near the gear shaping cutter head (12). A small-power gasoline engine balance shaft placement area is provided between the upper center (11) and the boss (4) of the fixture base. The small-power gasoline engine balance shaft (10) is vertically placed in the small-power gasoline engine balance shaft placement area. A Z-axis steering wheel is installed on the side of the small-power gasoline engine balance shaft (10). The limit rod (9) is in contact with the middle of the avoidance U-shaped rod of the small power gasoline engine balance shaft (10) during operation. The Z axis steering limit rod (9) is used for circumferential limiting of the balance shaft during the rotation feeding process. The clamp base boss (4) and the upper center (11) on the rotating base (1) jointly limit the axial vibration of the small power gasoline engine balance shaft (10) and provide circumferential rotation power. The feed gearbox body (13) controls the gear cutter head (12) to perform rapid up and down rotation and slow rotation movement to quickly rotate the balance shaft (10) of the small power gasoline engine. 0), tooth grooves, tooth profiles and tooth shapes are formed on the feed gearbox body (13), the feed gearbox body (13) is provided with an air inlet (14), the air inlet of the air inlet (14) is connected to the air outlet of the air pump, the air inlet (14) is symmetrically provided with two air outlets on the left and right sides, each of the air outlets is connected with a chip blowing air pipe (16), one end of each chip blowing air pipe (16) is connected to the air outlet, and the other end is provided with a blowing nozzle (17), the two blowing nozzles (17) are respectively located on both sides of the machining surface of the small power gasoline engine balance shaft (10), and the high-pressure gas is input into the chip blowing air pipe (16) after being sucked in from the air inlet (14). 16), and then after high-pressure air is ejected from the blowing nozzle (17), the waste chips on the machining surface of the small power gasoline engine balance shaft (10) can be discharged in real time. The clamp base boss (4) is provided with a plurality of base avoidance grooves (5), and a threaded hole for connecting the circular boss (3) is provided in the base avoidance groove (5). The clamp base boss (4) and the circular boss (3) are axially fixed by inserting a fastening screw into the threaded hole on the base avoidance groove (5). A front limit block (7) is provided on one side of the base avoidance groove (5). The molding method comprises the following steps: Step 1: insert the bottom of the small-power gasoline engine balance shaft (10) into the positioning hole provided at the center of the clamp base boss (4), and then move the top center (11) downward to fasten to the center positioning hole at the top of the small-power gasoline engine balance shaft (10) to complete its axial positioning; Step 2: then adjusting the angle of the small-power gasoline engine balance shaft (10) so that the Z-axis steering limit rod (9) is in point contact with the middle of the avoidance U-shaped rod of the small-power gasoline engine balance shaft (10); Step 3, the rotating base (1) is then rotated, and the rotating base (1) drives the small-power gasoline engine balance shaft (10) to rotate slowly. While the small-power gasoline engine balance shaft (10) rotates slowly, the feed gearbox body (13) controls the gear shaping cutter head (12) to move to a position within the processing area specified by the small-power gasoline engine balance shaft (10), and the feed gearbox body (13) starts to control the gear shaping cutter head (12) to move up and down quickly and rotate slowly, and then the gear shaping cutter head (12) gradually forms tooth grooves, tooth profiles and tooth shapes on the surface of the small-power gasoline engine balance shaft (10); during the processing, high-pressure gas is ejected from the blowing nozzle (17) and blown onto the processing surface of the small-power gasoline engine balance shaft (10), so that waste chips on the processing surface of the small-power gasoline engine balance shaft (10) are blown out in real time; Step 4: After the processing is completed, the gear shaping cutter head (12) first stops moving and leaves the surface of the small power gasoline engine balance shaft (10), and then the rotating base (1) stops rotating.

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