Improved shifting fork neutral position flash display riding mower gearbox

Abstract

According to the improved shifting fork neutral-gear flash display riding mower gearbox, lubrication and noise reduction are improved through material selection of each gearbox, and the quality is improved through neutral-gear flash display; a radial straight groove (15a), a radial inclined groove (15b) and an axial straight groove (15c) are formed in the square supporting shaft sleeve (15); a neutral position switch (59) comprises a neutral position ball head (59a), a neutral position ball top spring (59b) and a switch single pole (59c) to form a single-pole double-throw microswitch SB, the neutral position switch SB and a red and green light emitting diode which serves as an indicator light on a steering wheel and serves as a tail light on a gearbox shell form an astable self-excitation multivibrator, and a neutral position flash display circuit is formed for alternate indication. And the inner ring of the neutral shaft sleeve (24) is provided with a fan-shaped opening angle (24a) of which the opening angle of the section is 116 degrees, and the fan-shaped opening angle (24a) is matched with a head angle (53a) of a gear shifting fork (53), wherein the head angle (53a) is 69 degrees.

Description

Technical Field

[0001] The present invention relates to a lawn mower for mowing lawns in places such as courtyards, parks and roadsides, a lithium battery self-controlled lawn mower and a riding lawn mower gearbox with a modified shift fork of a powder metallurgy gear position and a neutral flashing display, belonging to the technical field of self-propelled gearboxes of lawn mowers. Background Art

[0002] The desire to pursue environmental protection and landscaping is beautiful, and the continuous improvement and gradual perfection of the width-adjustable and tension-tightening self-propelled pulleys for lawn mowers and lithium-powered automatic lawn mowers used for mowing lawns in courtyards, parks, and beside roads is endless. There are also multiple related patents. For example, the use of straight keys results in higher requirements for the precision of manufacturing tolerances and the possibility of occasional Euler instability of the pressure rod during long-term use. It also causes rust and adhesion over time, which hinders movement. Such products should be further improved. Generally, lawn mowers and lithium battery self-controlled lawn mowers use gearboxes. The output main shaft of the gearbox is the main rear shaft of the self-propelled lawn mower. The shaft end of the small gear of the gearbox is connected to the large pulley, and the large pulley is connected to the small pulley of the output shaft of the power machine, which is called the primary transmission; the small gear is meshed with the large gear, which is called the secondary transmission; the transmission of the walking gear with a one-way overrunning clutch at both ends of the main rear shaft and the rear wheel internal gear is called the tertiary transmission; the large gear is coaxial with the main rear shaft and can be rotatably mounted on the main rear shaft, and a clutch block is provided in the large gear, and the main rear shaft is also equipped with A clutch slider, wherein the clutch slider is provided with a clutch structure, wherein the interior of the clutch structure contains a slide groove that can slide along the main rear axle with the pin, wherein the pin is placed in a radial hole on the main rear axle and is perpendicular to the axis of the main rear axle, and a clutch movable block is provided at one end of the clutch structure so that when the operator pulls and releases the self-propelled handle of the lawn mower to drive the pull wire, the pull wire and the pull wire arm, shift fork, tension spring, compression spring, thrust bearing, gasket, rolling bearing, oil-containing bearing, upper gear box cover of the gear box, the clutch block provided in the large gear, and the clutch slider mounted on the main rear axle work together The self-propelled lawn mower can move on its own or not by driving and idling between the large gear and the main rear axle; the shaft of the small gear is mounted on the upper gear box cover through a bearing; the bearing mounting position of the upper gear box cover is next to the bearing mounting position of the gear box for the lawn mower; a movable wire pulling arm is mounted on the outside of the upper gear box cover, a wire pulling side plate is provided at the plate end of the wire pulling arm, and a small hole for hanging a small return tension spring is provided at the other plate end of the wire pulling arm; an open groove is provided on the wire pulling side plate at the plate end of the wire pulling arm, which is multi-folded to facilitate the wire rope side to be hung in. It is not easy to unhook, and it is convenient to rotate the wire pull arm by pulling the wire to drive the clutch device to engage and disengage; the plate of the wire pull arm is provided with an oblong hole to match the fork; the upper short shaft of the fork is also provided with double grooves and threads to place the pull arm and operate it by pulling the wire; the upper fork head and the lower fork head of the fork are symmetrical and protruding, and the fork includes two balanced shifting points; the large bevel gear with inner cone sleeve clutch is provided with a middle hole and a hollowed-out cone inside, so that the middle hole can penetrate the rear main shaft of the lawn mower, so that the hollowed-out cone can be adapted to the clutch block or the wave block, and at the same time, it is also convenient for the hollowed-out cone to be provided with an inner wall for mounting the clutch block;The hollowed-out cone is either provided with a cone or with an inner wall for mounting a clutch block and a plurality of small protrusions; mutually perpendicular holes are provided on the rear main shaft, so it is convenient to place the coarse cylindrical pin, the fine cylindrical pin and the compression spring; the pinion of the gearbox appropriately reduces the number of teeth of the small bevel gear to increase the speed ratio; the number of teeth of the small bevel gear is within 11, and the large bevel gear is 28; the inner cavity mold is first made by CNC or mold making, and then the powder is put on the press to be pressed into shape, and then sintered, that is, the small bevel gear and the large bevel gear with an inner cone sleeve clutch are manufactured by the powder metallurgy method, which prevents root cutting; the reducer upper shell of the upper gearbox cover can be directly installed; the small bevel gear uses the Oerkon pinion gear, and the large bevel gear uses the Oerkon large gear, which optimizes the secondary gear. The meshing parameters and geometric coefficients of the arc bevel gears are used to form cycloid hypoid gears; the short shafts at the upper and lower ends of the lower shell of the gear reduction clutch housing containing multiple parts of the lawn mower gear box, also known as the gear box for lawn mower, are rotated by a certain angle through a wire rope and a pull rod, and the upper fork head and the lower fork head are linked through an arc arm to push the sliding sleeve and the clutch bearing gasket and the clutch block to move axially, thereby engaging the clutch gear of the clutch device in the rear wheel drive gear reduction clutch of the self-propelled mechanism to carry out self-propelled movement; the clutch device contains a single-sided sliding sleeve of the lawn mower gear clutch reducer, which is composed of a sliding sleeve, a single-sided sliding edge, and an inner cone flange; the sliding sleeve of the single-sided sliding sleeve is provided with a single-sided sliding edge; the single-sided sliding edge of the single-sided sliding sleeve is provided with a Inner conical flange; and the sliding sleeve of the single-sided sliding sleeve is provided with a disc-shaped single-sided shifting edge; the inner side surface of the inner conical flange is a conical surface, and its angle with the axial direction is not greater than 30 degrees; since the single-sided sliding sleeve is mounted and slides on the main shaft, the axis of the single-sided sliding sleeve coincides with the main axis of the clutch device in the gear clutch reducer of the lawn mower, that is, the main axis of the rear wheel drive of the self-propelled lawn mower; the outer movable sleeve of the sliding sleeve of the single-sided sliding sleeve is provided with a shift fork; the shift fork can contact and shift the single-sided shifting edge of the single-sided sliding sleeve, that is, the inner conical flange of the single-sided shifting edge contacts the thrust bearing gasket, thereby making the clutch device work; the single-sided shifting edge of the single-sided sliding sleeve is disc-shaped; the back side of the disc of the single-sided shifting edge and The inner cone flange can contact the thrust bearing gasket; the upper short shaft of the shift fork is also provided with double grooves and threads to place the pull rod and operate it through the pull wire, so that the shift fork has both the desired shifting force and can rotate freely at a certain angle; thinking of the 1,000 patents in eight countries that the inventor has obtained and the inspiration of certain devices involved in manufacturing in foreign countries such as Switzerland and Israel, the invention improves and specially blends them, and then supplements them with innovation to make the product a higher level; but it is not easy to improve, it is easier said than done, and it is a long-standing and difficult problem in this field. In order to reduce the grinding cost of the straight key and make it easier to adapt, an improved lawn mower and lithium-powered automatic lawn mower with a pulley self-propelled device with a three-arc key sleeve inside came into being;However, the long-standing problems of pulleys sometimes slipping, gear boxes often making too much noise and how to sense the fork neutral position are still long-standing and difficult problems in this field. A self-propelled vehicle with a multi-rib pulley buffer pad has been proposed, and a plan has been proposed for a springless disc pulley self-propelled vehicle. Another plan has been proposed for an adjustable self-propelled vehicle with a throw-off chain ball, in order to improve and improve the electric self-propelled vehicle. The adjustable self-propelled vehicle with a throw-off chain ball has its advantages, but it is difficult to assemble because the slideway slots on both sides of the throw-off chain ball are two smooth planes parallel to each other, so as to slide along the slideway provided in the driving gear (23), but it is difficult to install the two smooth planes parallel to each other on the slideway in batches. Several adjusters that can be compatible with a quarter-logarithmic clutch disc and a throw-off chain ball with a magnetic clamp screw track have also been developed, but because of the throw-off chain ball, the adjusters are difficult to assemble. The two parallel smooth planes of the slideway slots provided on both sides of the chain ball have tolerance and form tolerance problems. The slideways on both sides provided in the driving gear (23) also have tolerance and form tolerance problems, so that problems of unsmooth operation occasionally occur during mass production, which is a long-standing problem. It is best not to use the slideways on both sides, because the two sides are not easy to be parallel in space when separated. There is also a conventional design of the two sides of the throwing chain ball using two parallel guide rods, which also has the main problem of not being easy to be parallel in space due to tolerance and form tolerance problems. Because the two sides are occupied by two parallel guide rods, only one tension spring can be used on the central sliding axis, which makes it difficult to balance the forces on both sides of the throwing chain ball, i.e., the slider. Since the movement of the slider is the combined effect of complex factors such as Fourier density waves and Euler instability, it is not as ideal as using springs on both sides. There is another problem. In order to make the common rotation axis of the driving gear (23) and the small spur gear with the throw-off clutch follower teeth of the related slider clutch more smoothly clutched, a self-propelled device with a central flat rail double-side spring and top ball and a shift fork with powder metallurgy gears have been gradually developed. ;

[0003] It was initially conceived that in order to achieve smoother clutching, a self-propelled device with a central flat rail, double-sided springs and a top ball came into being, in order to improve and enhance the gear self-propelled device for electric lawn mowers; the adjustable self-propelled device with a throw-off chain ball has its advantages, but it is difficult to assemble, because the slideway grooves on both sides of the throw-off chain ball are two smooth planes parallel to each other, in order to slide along the slideway provided in the driving gear, but it is difficult to install two smooth planes parallel to each other on the slideway in batches; several types of adjusters that can be compatible with a four-logarithmic clutch disk and a throw-off chain ball with a magnetic clamp screw rail have also been developed, but because the two smooth planes of the slideway grooves on both sides of the throw-off chain ball are parallel to each other, there are tolerances and form and position tolerances. The problem is that the two side slideways in the driving gear also have tolerance and form tolerance problems, so that in mass production, there are occasional problems with unsmooth operation. It is best not to use the two side slideways, because the two sides are not easy to be parallel in space when separated. There is also a conventional design that uses two parallel guide rods on both sides of the throw-off chain ball. The main problem is that it is not easy to be parallel in space due to tolerance and form tolerance problems. Because the two sides are occupied by two parallel guide rods, only one tension spring can be used on the central sliding axis, which makes it difficult to balance the forces on both sides of the throw-off chain ball, i.e. the slider. And because the movement of the slider is the combined effect of complex factors such as Fourier density wave and Euler instability, it is not as ideal as using springs on both sides. There is another problem, how can the common rotation axis of the driving gear and the small spur gear with throw-off clutch teeth of the related slider clutch be more compliant and slippery? In order to achieve smoother clutching, a self-propelled device with a central flat rail and double-sided springs with top beads came into being. The central flat rail is used to replace the original slideway slots on both sides and the two guide rods that strive to be parallel, which helps solve the problem of difficult spatial parallelism; the double-sided springs are used to replace the original single tension spring, which helps solve the problem of unbalanced forces on both sides of the original slider; top beads are provided at both ends of the common rotating shaft, which helps solve the problem of the original rotating shaft not being smooth and accurate in clutching.

[0004] Gradually improve and transform, use the existing improvements more economically, in order to form economies of scale for a series of products.

[0005] There are long-standing and difficult problems in this field. Therefore, based on the self-propelled device with multi-rib pulley buffer pad that has been proposed before, the self-propelled device with springless disc pulley that has been proposed later, and the self-propelled device with a throw-away chain and an upper and lower throw-away chain ball that can be adjusted, an adjuster with a throw-away chain ball and a magnetic clamp screw rail is proposed, in order to improve the assembly of mass production series products and provide international customers with more varieties to choose from.

[0006] Later, in order to achieve smoother clutching, an adjuster self-propelled vehicle with a four-logarithmic clutch disk was innovated. The clutch main teeth on the swing-away chain ball on the slideway in the driving large gear will be detached from the rear drag when not rotating and swinging away, thus playing a clutch protection role. When rotating and swinging away, they will contact and push the small spur gears of the four-logarithmic clutch disk with their own swing-away clutch teeth, and then push the two spur gears with flywheels, so that the rear output shaft drives the rear wheels. The adjuster self-propelled vehicle with a four-logarithmic clutch disk has a four-logarithmic clutch disk, and at least three or four or more swing-away clutch teeth are arranged on the periphery of the disk with the four-logarithmic clutch disk. The outer contour lines of the inner tooth surfaces on both sides of the inner gear teeth of each of the swing-away clutch teeth are not involute lines but nearly involute lines. A similar logarithmic spiral is used to utilize the characteristic that the pressure angle is equal everywhere, so that the outer contour of the inner tooth surface is not continuously meshed but has an impact with the outer contour of the logarithmic spiral that is approximately similar to the clutch main tooth on the thrown chain ball, so as to engage more smoothly; the outer periphery of the disk with four-part logarithmic clutch disk is provided with a plurality of dense semicircular sliders with smooth arc surfaces facing outward, and the disk periphery of the disk with four-part logarithmic clutch disk is provided with a plurality of dense radial stripes with smooth arc surfaces facing outward, so as to facilitate sliding when in contact with the adjacent driving large gear and reduce friction resistance; the center of the disk with four-part logarithmic clutch disk is provided with eight fan-shaped claws, so as to facilitate the centers of the eight fan-shaped claws to be flexibly inserted into the central steel shaft so that the clutch disk can be more smoothly clutched.

[0007] The power of a commonly used lawn mower is driven by a belt and a pulley from the vertical blade shaft of the engine located in the middle of the lawn mower. The speed is changed from 3000 rpm to 1500 rpm, and then the secondary transmission is led to the reducer with a clutch located at the rear of the lawn mower. The speed ratio of the secondary reducer is 5, and the speed is changed from 1500 rpm to 300 rpm of the driving rear shaft. Then the tertiary transmission is performed, and the coaxial driving gear of the driving rear shaft is meshed with the internal gear ring in the rear wheel of the lawn mower. Because the rear wheel needs to adjust different mowing heights, the shaft of the rear wheel is on the height adjustment frame and cannot be coaxial with the driving rear shaft, but the two shafts are parallel, so that the maximum self-propelled speed of the lawn mower is approximately one meter per second to meet customer requirements; however, the technical difficulty is that the power consumption of the lawn mower is limited by the power supply. If the motor adopts a brushed series-excited motor, the brushes will cause great interference to the radio. The lawn mower uses a lithium battery pack for charging and power supply, and the electric motor uses a brushless motor, which is a certain improvement; but in order to pursue small size and high output, the speed of the brushless motor is as high as more than 20,000 revolutions per minute, which is more than ten times higher than the initial speed of the original reducer of 1,500 revolutions per minute. This greatly increases the difficulty of the electric reducer, and puts forward high requirements for reducing costs, reducing noise, suppressing temperature rise, and increasing the ratio. The lawn mower with a brushless motor rear axle drive reducer uses a brushless motor with a speed of 20,000 revolutions per minute, a power of 250 watts, 36 volts, and an output shaft diameter of 5 mm, which is still insufficient. However, there are still many technical problems that need to be improved, so the modified fork neutral flash riding mower gearbox came into being. Summary of the invention

[0008] Objectively, lawn mowers not only need shift forks for clutching and shifting, but also need multiple gears and accurate shifting. The original multi-gears were made by stamping flanges, so the multi-gears were rough or crooked. After trial production with various plans, a shift fork with powder metallurgy gears is now used to form a modified shift fork neutral flash riding lawn mower gearbox. The benefits are accurate gears, significant effects, easy operation, improved lubrication, and reduced noise.

[0009] The modified gearbox of a fork neutral flashing riding lawn mower is characterized in that it comprises a long output shaft (1), a differential tooth gasket (2), a spline hole differential gear (3), a φ18 shaft retaining spring (4), a 43-tooth differential gear (5), a round hole differential gear (6), a differential gear transmission pin (7), a short output shaft (8), a TC skeleton oil seal (9), a three-stage 34-tooth driven gear (10), an intermediate shaft spacer (11), an intermediate spline sleeve (12), a shaft sleeve gasket (13), 13-tooth differential pinion (14), square support sleeve (15), three-stage 11-tooth driving gear (16), shift shaft (17), shift sleeve (18), shift shaft fork assembly (19), rocker arm square shaft (20), φ28 shaft retaining ring (21), butterfly washer (22), reverse gear 25-tooth driven gear (23), neutral sleeve (24), first gear 35-tooth driven gear (25), second gear 30-tooth driven gear (26), third gear 25-tooth driven gear (27), 23-tooth driven gear for the fourth gear (28), 20-tooth driven gear for the fifth gear (29), shift shaft gasket (30), brake fixing bracket (31), brake limit bracket (32), M8 nylon anti-loosening nut (33), 8.8-grade thin-head flat square bolt (34), brake nut gasket (35), 10.9-grade external hexagon flange bolt (36), TC skeleton oil seal (37), brake disc (38), first-level spline shaft (39), 30-tooth driven gear for the fifth gear Gear (40), 26-tooth driving gear for fourth gear (41), 25-tooth driving gear for third gear (42), 20-tooth driving gear for second gear (43), 15-tooth driving gear for first gear (44), reverse gear driving gear (45), input passive gear (46), brake adjustment plate (47), brake compression spring (48), brake pad (49), brake pad (50), semicircular key (51), cylindrical pin (52), shift fork (53), shift limit seat (54), 8.8-grade hexagon socket bolt (55), hexagon socket thread plug (56), shift limit spring (57), solid steel ball (58), neutral switch (59), neutral switch O-ring (60), shaft retaining ring (61), input driving gear (62), SCE108 stamped outer ring needle roller bearing (63), black TC skeleton oil seal (64), input shaft (65), open retaining ring (66), input shaft gasket (67), input shaft O-ring (68), shift fork O-ring (69), riding lawn mower gearbox upper shell (70), riding lawn mower gearbox lower shell (71) , QR code sticker (72), lubricating blending grease (73); the long output shaft (1) is made of 40Cr medium carbon steel and is partially high-frequency quenched; the differential tooth gasket (2) is made of 65Mn spring steel and is heat-treated to a Rockwell hardness of HRC55-62 and then surface-finished; the spline hole differential gear (3) has 12 teeth and is pressed with powder metallurgy material FN0208 and then sintered to a Rockwell hardness of HRC35-43; the φ18 shaft retaining ring (4) is made of black 65Mn spring steel; the 43-tooth differential gear (5) is made of powder metallurgy and copper material The material SFT41231+15% CU is pressed and sintered to a Rockwell hardness of HRC35-43 degrees, which is beneficial to toughness; the circular hole differential gear (6) has 12 teeth and is pressed with powder metallurgy material FN0208 and sintered to a Rockwell hardness of HRC35-43 degrees; the differential gear drive pin (7) is made of 20CrMo, i.e., 20# chromium-molybdenum medium carbon steel, and is subjected to a quenching heat treatment process of carbon-nitrogen-boron co-diffusion to make the diffusion layer 0.6-1mm to a Rockwell hardness of HRC55-62 degrees, which is beneficial to inner softness and outer steel; the short output shaft (8) is made of 40Cr medium carbon steel and is subjected to local high frequency quenching heat treatment to make the diffusion layer 0.6-1mm ... The TC skeleton oil seal (9) is a double-lip seal with a self-tightening spring completely covered with oil-resistant rubber, which is beneficial to oil-resistant sealing; the three-stage 34-tooth driven gear (10) is pressed with powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees, which is beneficial to wear resistance; the intermediate shaft spacer (11) is pressed with powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees; the intermediate spline shaft (12) is made of 20CrMn, i.e., 20# chromium manganese medium carbon steel, and is carbonitrided and boronized to make the infiltration layer 0.The quenching heat treatment process of 6-1mm to the Rockwell hardness HRC55-62 degrees is beneficial to the inner softness and outer steel; the sleeve gasket (13) is made of 65Mn, that is, spring steel 65 manganese, and is quenched and tempered to the Rockwell hardness HRC55-62 degrees and polished to improve the rigidity and reduce the internal stress; the 13-tooth differential pinion (14) is pressed with powder metallurgy material FN0208 and then sintered to the Rockwell hardness HRC35-43 degrees, which is beneficial to wear resistance; the square support sleeve (15) has a plurality of supporting functions on each shaft, and is pressed with iron-copper alloy FC0205-40, which is oil-containing. In order to make it more smoothly lubricated, an important improvement and significant feature is that a plurality of radial straight grooves (15) are provided on each square support sleeve (15). a) and radial inclined grooves (15b) and axial straight grooves (15c), which increase the oil flow channels, and the outer contour of the square support sleeve is changed from the original round to square, which increases the outer contour gap, which is conducive to improving oil flow lubrication; further improvement, not only the outer contour of the square support sleeve is changed from the original round to square, but also a plurality of protruding blade fan fins (15d) are provided on the outer contour of the square support sleeve, which is more conducive to improving oil flow lubrication, but the blade fan fins should not be raised too high to avoid excessive power consumption; the three-stage 11-tooth driving gear (16) has 11 teeth and is pressed from powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees, so as to reduce gear shaping machine processing; the shift shaft (17) is made of 20CrMn, i.e., 20# chromium manganese medium carbon steel, and is carbonitrided to a carburized layer of 0.6-1mm quenching heat treatment process to Rockwell hardness HRC55-62 degrees, so as to be beneficial to the inner softness and outer steel; the shift shaft sleeve (18) is pressed with powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees; the shift shaft fork assembly (19) is provided with a neutral position (98) and a neutral flashing device and a shift fork (53); the left end of the semi-circular arc fork arm at the front of the shift shaft fork assembly (19) is provided with a left fork hand (81), the right end of the semi-circular arc fork arm at the front of the shift fork shift shaft fork assembly (19) is provided with a right fork hand (82), the middle part of the right end of the semi-circular arc fork arm at the front of the shift fork shift shaft fork assembly (19) is provided with two gear position screws (84), and the shift fork A fixing platform is also provided at the middle of the right end of the semicircular fork arm of the front part of the fork shift shaft fork assembly (19) so as to fix the powder metallurgy gear (90), and the powder metallurgy gear (90) is provided with a tightening platform for precision tapping that can fix the two gear screws (84), and the powder metallurgy gear (90) is provided with a first gear (91), a second gear (92), a third gear (93), a fourth gear (94), a fifth gear (95), a sixth gear (96), and a seventh gear (97) which are arranged in sequence according to a quarter arc with the rotating shaft of the fork shift shaft fork assembly (19) as the rotating shaft, and the first gear (91), the second gear (92), the third gear (93), the fourth gear (94), the fifth gear (95), the sixth gear (96), and the seventh gear (97) are arranged in sequence according to a quarter arc, and the first gear (91), the second gear (9 2) The concave arc of each of the third gear (93), the fourth gear (94), the fifth gear (95), the sixth gear (96) and the seventh gear (97) is a section of a logarithmic spiral so as to utilize the characteristic that the pressure angle of the logarithmic function is equal everywhere and is beneficial to uniform force, or the concave arc of each gear is a parabolic pit slightly shallower than the semicircular pit so as to reduce resistance and smoothly shift gears; the rocker arm square shaft (20) is made of 40 chromium medium carbon alloy steel 40Cr tempered; the φ28 shaft retaining ring (21) is made of 65Mn, i.e. spring steel 65 manganese, which is subjected to quenching and tempering heat treatment process to Rockwell hardness HRC55-62 degrees and is subjected to surface blackening treatment to be beneficial to service life; the butterfly gasket (22) is a plurality of spring steel 65 manganese After quenching and tempering heat treatment to Rockwell hardness HRC45-53 degrees; the reverse gear 25-tooth driven gear (23) is pressed by powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees, which is beneficial to durability and less machining; the neutral shaft sleeve (24) is pressed by powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees. In order to make it work more smoothly, the important improvement and significant feature is that the inner ring of the neutral shaft sleeve (24) is provided with a cross-section opening angle of 116 degrees and a fan-shaped opening angle (24a) with straight edges on both sides, which is beneficial to match the head angle (53a) of the shift fork (53) with an outer opening angle of 111 degrees of 69 degrees, and the clearance angle on each side is 2.5 degrees, and the experiment shows that it is easier to spring on and easier to get stuck in with the matching sliding key; in order to solve the problem that the control steel shaft of the shift shaft fork assembly (19) and the aluminum die-casting, that is, the left and right ends of the semi-circular fork arms of the front part are provided with left and right fork hands, the important improved feature is that a spline or a flattened die-casting insert (19a) is preset on the control steel shaft of the shift shaft fork assembly (19) to facilitate reliable die-casting as a whole, and the left fork hand (81) and the right fork hand (82) are also preset as pre-inserted steel blocks with large and small heads, which are formed together in the die-casting mold, and the position of the spline or the flattened die-casting insert (19a) preset on the control steel shaft is in the neutral position (9 8) for the projection area of ​​the control steel shaft; the first gear 35-tooth driven gear (25), the second gear 30-tooth driven gear (26), the third gear 25-tooth driven gear (27), the fourth gear 23-tooth driven gear (28), and the fifth gear 20-tooth driven gear (29) are all pressed with powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees, which is beneficial to durability and less machining; the shift shaft gasket (30) is SPCC plated with blue-white zinc to prevent rust; the brake fixing bracket (31) is die-cast with ADC12 insert screws to prevent impact loads; the brake limit bracket (32) is SPCC plated with blue-white zinc; the M8 nylon anti-loosening nut (33) 35# steel is plated with blue and white zinc to prevent rust; the 8.8# thin head flat square bolt (34) is made of A3 steel as a high strength bolt; the brake nut gasket (35) is made of SPCC plated with blue and white zinc to prevent rust; the 10.9# hexagonal flange bolt (36) is made of 45# steel as a high strength bolt, 21 of which are blackened; the TC skeleton oil seal (37) is φ15.8 and made of NBR butadiene rubber; the brake disc (38) is made of gray iron F1001G and treated to a Brinell hardness of HB100; the first-level spline shaft (39) is made of 20CrMo, i.e. 20# chromium-molybdenum medium carbon steel, which is carburized to a carburized layer of 0.6-1mm and quenched to a Rockwell hardness of HRC5 6-61 degrees, which is beneficial to the inner softness and outer steel; the fifth gear 30-tooth driving gear (40), the fourth gear 26-tooth driving gear (41), the third gear 25-tooth driving gear (42), the second gear 20-tooth driving gear (43), and the first gear 15-tooth driving gear (44) are all made of powder metallurgy material FN0208 pressed and sintered to Rockwell hardness HRC35-43 degrees, which is beneficial to durability and less machining; the reverse gear brake nut gasket (35) is SPCC plated with blue-white zinc to prevent rust; the 10.9-grade external hexagon flange bolt (36) is made of 45# steel for high-strength bolts, 21 of which are all black; the TC skeleton oil seal (37) is φ15.8 and made of NBR Ding. The brake disc (38) is made of gray iron F1001G and treated to a Brinell hardness of HB100 degrees; the primary spline shaft (39) is made of 20CrMo, i.e., 20# chromium-molybdenum medium carbon steel, and is subjected to a quenching heat treatment process to carburize the carburized layer to a thickness of 0.6-1 mm to a Rockwell hardness of HRC56-61 degrees, which is beneficial to the inner softness and the outer steel; the fifth gear 30-tooth driving gear (40), the fourth gear 26-tooth driving gear (41), the third gear 25-tooth driving gear (42), the second gear 20-tooth driving gear (43), and the first gear 15-tooth driving gear (44) are all made of powder metallurgy material FN0208, which is pressed and then sintered to a Rockwell hardness of HRC35-43 degrees, which is beneficial to durability and less machining. The reverse gear driving gear (45) and the input driven gear (46) are made of low alloy powder metallurgy material SMF5040, which is pressed and sintered to Rockwell hardness HRC35-43 degrees to be durable; the brake adjustment plate (47) is made of 45 steel, which is nitrided and blackened to be durable; the brake compression spring (48) is made of 65Mn steel wire φ1.1, that is, spring steel 65 manganese, which is normalized and heat treated to be beneficial to elasticity and reduce internal stress; the brake pad (49) is made of 65Mn spring steel 65 manganese, which is quenched and tempered to reduce internal stress; the brake pad (50) is asbestos-free to be environmentally friendly; the semicircular key (51) is easy to process and install; the cylindrical pin (52 ) is made of GCr15 high carbon chromium bearing steel after quenching and low temperature tempering to achieve wear resistance and contact fatigue; the shift fork (53) is made of 65Mn spring steel 65 manganese material after medium wire cutting, tempering heat treatment to HRC52-58 degrees and then shot peening to reduce internal stress and fatigue resistance; the shift limit seat (54) is pressed with powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees to facilitate durability; the 8.8 grade hexagon socket bolt (55) is made of A3 steel as a high-strength bolt; in order to ensure the reliability of shifting, the modified shift fork neutral flash riding lawn mower gearbox is provided with a hexagon socket thread plug (56), a shift limit spring (57), a solid steel The gear shift adjusting torque device is composed of a solid steel ball (58) so as to coordinate with the first gear (91), the second gear (92), the third gear (93), the fourth gear (94), the fifth gear (95), the sixth gear (96) and the seventh gear (97) arranged in sequence in a quarter arc with the rotating shaft of the gear shift fork assembly (19) as the rotating shaft, and the solid steel ball (58) can accurately find the position of each gear to smoothly shift gears; the hexagonal thread plug (56) is made of A3 material with blackening treatment; the gear shift limit spring (57) is made of 65Mn spring steel wire φ1.1 that is, the spring steel wire 65 manganese is heat-treated and plated with blue-white zinc to prevent rust; the solid steel ball (58) is made of GCr15 high carbon chromium bearing steel, which is quenched to HRC50-62 degrees and then polished to achieve wear resistance and contact fatigue as well as durability and noise reduction; the neutral switch (59) is shaped like a bolt and nut to facilitate fixing, but is actually a normally closed switch with a flashing circuit; the neutral switch O-ring (60) is made of NBR. The shaft retaining ring (61) is made of 65Mn spring steel 65 manganese after heat treatment and its surface is blackened to prevent rust; the input driving gear (62) is 13 teeth and is made of 5040SMF powder metallurgy material pressed and sintered to achieve Rockwell hardness HRC35-43 degrees for toughness and less machining; the SCE108 stamped outer ring needle roller bearing (63) has two; the black TC skeleton oil seal (64) is made of NBR The input shaft (65) is made of 20CrMo, i.e., 20# chromium-molybdenum medium carbon steel, which is carburized to a carburized layer of 0.6-1mm and then quenched to a Rockwell hardness of HRC56-61, which is beneficial to the toughness of the outer steel and the inner softness; the open retaining ring (66) is made of 65Mn spring steel in black; the input shaft clamping pad (67) is made of 65Mn spring steel; the input shaft O-ring (68) is made of NBR The shift fork O-ring (69) is made of NBR rubber; the upper shell (70) of the riding lawn mower gearbox and the lower shell (71) of the riding lawn mower gearbox are both made of die-cast aluminum material ADC12 and formed by an 800-ton die-casting machine; the two-dimensional code sticker (72) is made of silver paper; the lubricating blending grease (73) is made of 350g and 500g of lubricating oil to bear heavy loads; in order to promote the circulation of lubricating blending grease, a plurality of oil-passing grooves (99) are provided between the upper shell (70) of the riding lawn mower gearbox and the lower shell (71) of the riding lawn mower gearbox and the long output shaft (1) and the short output shaft (8); because of the weakness of the non-constant elongation of the pull rope, the gear shift shaft of the riding lawn mower gearbox is transmitted from the rider's feeling lever to the gear shift shaft of the riding lawn mower gearbox. The shifting swinging condition on the control steel shaft of the fork assembly (19), especially the anxiety of confirming whether the neutral gear is in place, requires that a neutral position (98) be provided on the rotating shaft of the shifting shaft fork assembly (19) so as to cooperate with the neutral switch (59) and the flashing circuit installed on the housing; the neutral switch (59) comprises a neutral ball head (59a), a neutral ball top spring (59b) and a switch single pole (59c), together with two terminals, to form a practical single-pole double-throw micro switch SB. When the neutral ball head (59a) enters the neutral position, the switch single pole (59c) of SB is closed with an upper terminal. When the neutral ball head (59a) is not in the neutral position, the switch single pole (59c) of the single-pole double-throw micro switch SB is closed with a lower terminal. The circuit contacts of the square are closed, together with several red and green light emitting diodes that can be used as indicator lights on the steering wheel and the gearbox housing as tail lights, a simple astable self-excited multivibrator is built to form a neutral flashing circuit; the neutral flashing circuit includes the single-pole double-throw micro switch SB, the main power switch S2, the night tail light working switch S1, the first resistor R1 is 220 ohms, the second resistor R2 is 33K, the third resistor R3 is 33K, the fourth resistor R4 is 220 ohms, the first silicon NPN transistor VT1, the second silicon NPN transistor VT2, the first electrolytic capacitor C1 is 33 microfarads, the second electrolytic capacitor C2 is 33 microfarads, the third electrolytic capacitor C3 is 100 microfarads, the battery CELL, the first light emitting diode LED1 is red , the fifth light emitting diode LED5 is red, the third light emitting diode LED3 is green, and the seventh light emitting diode LED7 is red; when in neutral, the single-pole double-throw micro switch SB is in the dynamic closing position, that is, the upward position shown in the figure; when not in neutral, the single-pole double-throw micro switch SB is in the static closing position, that is, the downward position shown in the figure; when in neutral, the single-pole double-throw micro switch SB is in the dynamic closing position, that is, the upward position shown in the figure, and the main power switch S2 is closed. Since the taillight working switch S1 is in the open position at night, the upper ends of the second resistor R2 and the third resistor R3 are suspended, and the self-excited multivibrator composed of the first silicon NPN transistor VT1 and the second silicon NPN transistor VT2 stops oscillating due to the lack of base bias current, and the light-emitting tubes are not lit;When the driving operating handle drives the pull rope to the control steel shaft of the gear shift shaft fork assembly (19) of the riding lawn mower gearbox to shift gears, the side of the approximately similar logarithmic curve of the neutral position (98) provided on the rotating shaft of the gear shift shaft fork assembly (19) pushes out the neutral ball head (59a), causing the neutral ball top spring (59b) to be compressed and the switch single pole (59c) to make the single pole double throw micro switch SB fall downward, the second resistor R2 and the upper end of the third resistor R3 are connected, and the self-excited multivibrator composed of the first silicon NPN transistor VT1 and the second silicon NPN transistor VT2 forms a self-excited multivibrator due to the base bias current. The self-excited multivibrator is energized and immediately starts to oscillate, and the first silicon NPN transistor VT1 and the second silicon NPN transistor VT2 are connected. The N transistor VT2 is turned on and off in turn, and the red fifth light emitting diode and the red seventh light emitting diode LED7 flash alternately to indicate that the gearbox is shifting; sometimes, when working at night or in dark rain and fog, the night taillight working switch S1 can be closed. At this time, the second resistor R2 and the third resistor R3 can provide base bias current for the first silicon NPN transistor VT1 and the second silicon NPN transistor VT2 through the night taillight working switch S1. Regardless of whether the gear is in neutral or not, the self-excited multivibrator can also start to oscillate. At this time, the red light emitting diode LED1 and the green light emitting diode LED3 flash alternately, which can play a good decorative effect and notice role, forming a modified fork neutral flashing riding lawn mower gearbox. ;

[0010] Benefits:

[0011] The modified shift fork neutral flash riding lawn mower gearbox is carefully selected, processed and precisely manufactured with every part, which increases the service life, accurate gear position, significant effect, convenient operation, improved lubrication, reduced noise and neutral flash to improve quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0013] Figure 1 , is an enlarged schematic diagram of the gear shifting cross section of the modified shift fork neutral flashing riding lawn mower transmission.

[0014] Figure 2 , is a longitudinal section schematic diagram of a modified shift fork neutral flashing riding lawn mower gearbox.

[0015] Figure 3 , is a schematic longitudinal section of the shift brake shaft of the modified shift fork neutral flashing riding lawn mower transmission.

[0016] Figure 4 , is a schematic diagram of the longitudinal section AA of the drive shaft of the modified shift fork neutral flash riding lawn mower gearbox.

[0017] Figure 5, is a schematic diagram of a gear shift cross section of a modified shift fork neutral flashing riding lawn mower transmission.

[0018] Figure 6 , is a schematic diagram of the CC section of a modified shift fork neutral flash riding lawn mower transmission.

[0019] Figure 7 , is a schematic diagram of the shift shaft fork assembly (19).

[0020] Figure 8 , is a schematic diagram of a modified shift fork neutral flashing riding lawn mower transmission.

[0021] Fig. 9 , is a schematic diagram of the modified shift fork neutral flashing circuit.

[0022] Fig.10 , is a schematic diagram of a square support sleeve (15).

[0023] Fig.11 , is a schematic diagram of the neutral shaft sleeve (24).

[0024] Fig.12 , is a partial cross-sectional schematic diagram of a shift shaft fork assembly (19) including a die-cast insert (19a).

[0025] Fig.13 , is a partial cross-sectional rear view schematic diagram of a shift shaft fork assembly (19) including a die-cast insert (19a).

[0026] Fig.14 , is a schematic diagram of the shift fork (53) including the head angle (53a).

[0027] As shown in the figure, in the figure:

[0028] 1. Long output shaft (1), 2. Differential gear spacer (2), 3. Spline hole differential gear (3), 4. φ18 shaft retaining spring (4), 5. 43-tooth differential gear (5), 6. round hole differential gear (6), 7. differential gear drive pin (7), 8. short output shaft (8), 9. TC skeleton oil seal (9), 10. three-stage 34-tooth driven gear (10), 11. intermediate shaft spacer (11), 12. intermediate spline sleeve (12), 13. sleeve gasket (13), 14. 13-tooth differential pinion (14), 15. square support sleeve (15), 16. three-stage 11-tooth driving gear (16), 17. shift shaft (17), 18. shift shaft sleeve (18), 19. shift shaft fork assembly (19), 20. rocker arm square shaft (20), 21. φ28 shaft retaining ring (21), 22. butterfly gasket (2 2), 23. Reverse gear 25-tooth driven gear (23), 24. Neutral shaft sleeve (24), 25. First gear 35-tooth driven gear (25), 26. Second gear 30-tooth driven gear (26), 27. Third gear 25-tooth driven gear (27), 28. Fourth gear 23-tooth driven gear (28), 29. Fifth gear 20-tooth driven gear (29), 30. Shift shaft gasket (30), 31. Brake fixing bracket (31), 32. Brake limit bracket (32), 33. M8 nylon anti-loosening nut (33), 34. 8.8-grade thin head flat square bolt (34), 35. Brake nut gasket (35), 36. 10.9-grade external hexagon flange bolt (36), 37. TC skeleton oil seal (37), 38. Brake disc (38), 39. Primary spline shaft (39), 40. Fifth gear 30-tooth driving gear (40), 41. Fourth gear 26-tooth driving gear (41), 42. Third gear 25-tooth driving gear (42), 43. Second gear 20-tooth driving gear (43), 44. First gear 15-tooth driving gear (44), 45. Reverse gear driving gear (45), 46. Input driven gear (46), 47. Brake adjustment plate (47), 48. Brake compression spring (48), 49. Brake pad (49), 50. Brake pad (50), 51. Semicircular key (51), 52. Cylindrical pin (52), 53. Shift fork (53), 54. Shift limiter seat (54 )、55.8.8 grade hexagon socket bolt (55), 56. Hexagon socket thread plug (56), 57. Shift limit spring (57), 58. Solid steel ball (58), 59. Neutral switch (59), 60. Neutral switch O-ring (60), 61. Shaft retaining ring (61), 62. Input driving gear (62), 63. SCE108 stamped outer ring needle roller bearing (63), 64. Black TC skeleton oil seal (64), 65. Input shaft (65), 66. Open retaining ring (66), 67. Input shaft clamping gasket (67), 68. Input shaft O-ring (68), 69. Shift fork O-ring (69), 70. Riding lawn mower gearbox upper shell (70), 71.Ride-on lawn mower gearbox lower shell (71), 72. QR code sticker (72), 73. Lubricating blending grease (73); 15a. Radial straight groove (15a); 15b. Radial inclined groove (15b); 15c. Axial straight groove (15c); 15d. Raised blade fin (15d); 98. Neutral gear position (98); 81. Left fork hand (81); 82. Right fork hand (82); 84. Gear position screw (84); 90. Powder metallurgy Gear position (90); 91. First gear position (91), 92. Second gear position (92), 93. Third gear position (93), 94. Fourth gear position (94), 95. Fifth gear position (95), 96. Sixth gear position (96), 97. Seventh gear position (97); 24a. Fan-shaped opening angle (24a); 53a. Head angle (53a); 19a. Die-cast insert (19a); 99. Oil-passing groove (99); 59a. Neutral ball Head (59a); 59b. Neutral ball top spring (59b); 59c. Switch single pole (59c); SB. Single pole double throw micro switch SB; S2. Power supply main switch S2, S1. Night tail light working switch S1, R1. First resistor R1, R2. Second resistor R2, R3. Third resistor R3, R4. Fourth resistor R4, VT1. First silicon NPN transistor VT1, VT2. Second silicon NPN transistor VT2, C1. First electrolytic capacitor C1, C2. Second electrolytic capacitor C2, C3. Third electrolytic capacitor C3, CELL. Battery CELL, LED1. First light emitting diode LED1, LED5. Fifth light emitting diode LED5, LED3. Third light emitting diode LED3, LED7. Seventh light emitting diode LED7; SB. Single pole double throw micro switch SB; S2. Power supply main switch S2; S1. Night tail light working switch S1. . DETAILED DESCRIPTION

[0029] The pulley self-propelled device with a three-arc key sleeve inside the lawn mower and the lithium-powered automatic lawn mower and the adjustable self-propelled device with a throw-off chain ball are constantly improved year by year. Only by daring to explore can we gradually improve and form various series of products. However, the rising tide still makes all boats rise, and there are still many technical problems that need to be improved. From lawn mowers pushed by people to riding mowers, many expectations are put forward for the gearbox; because the riding mower's operating handle from the driver is transmitted to the gearbox through a long pull wire, many gears are rough or crooked, so the gears are not accurate enough, especially the neutral gear lacks clear indication. As a heavy load, it is urgently needed to improve lubrication and reduce noise; for many parts of the riding mower, from material selection to processing, they must be carefully selected, and each part cannot be sloppy in order to improve the quality of the whole machine. Therefore, the modified fork neutral flash riding mower gearbox came into being, starting with material selection.

[0030] The modified gearbox of the fork neutral flashing riding lawn mower is made of various materials, including a long output shaft (1), a differential tooth gasket (2), a spline hole differential gear (3), a φ18 shaft retaining spring (4), a 43-tooth differential large gear (5), a round hole differential gear (6), a differential gear transmission pin (7), a short output shaft (8), a TC skeleton oil seal (9), a three-stage 34-tooth driven gear (10), an intermediate shaft spacer (11), an intermediate spline sleeve (12), a shaft sleeve gasket (13), 13-tooth differential pinion (14), square support sleeve (15), three-stage 11-tooth driving gear (16), shift shaft (17), shift sleeve (18), shift shaft fork assembly (19), rocker arm square shaft (20), φ28 shaft retaining ring (21), butterfly washer (22), reverse gear 25-tooth driven gear (23), neutral sleeve (24), first gear 35-tooth driven gear (25), second gear 30-tooth driven gear (26), third gear 25-tooth driven gear (27), 23-tooth driven gear for the fourth gear (28), 20-tooth driven gear for the fifth gear (29), shift shaft gasket (30), brake fixing bracket (31), brake limit bracket (32), M8 nylon anti-loosening nut (33), 8.8-grade thin-head flat square bolt (34), brake nut gasket (35), 10.9-grade external hexagon flange bolt (36), TC skeleton oil seal (37), brake disc (38), first-level spline shaft (39), 30-tooth driven gear for the fifth gear Gear (40), 26-tooth driving gear for fourth gear (41), 25-tooth driving gear for third gear (42), 20-tooth driving gear for second gear (43), 15-tooth driving gear for first gear (44), reverse gear driving gear (45), input passive gear (46), brake adjustment plate (47), brake compression spring (48), brake pad (49), brake pad (50), semicircular key (51), cylindrical pin (52), shift fork (53), shift limit seat (54), 8.8-grade hexagon socket bolt (55), hexagon socket thread plug (56), shift limit spring (57), solid steel ball (58), neutral switch (59), neutral switch O-ring (60), shaft retaining ring (61), input driving gear (62), SCE108 stamped outer ring needle roller bearing (63), black TC skeleton oil seal (64), input shaft (65), open retaining ring (66), input shaft gasket (67), input shaft O-ring (68), shift fork O-ring (69), riding lawn mower gearbox upper shell (70), riding lawn mower gearbox lower shell (71) , QR code sticker (72), lubricating blending grease (73); the long output shaft (1) is made of 40Cr medium carbon steel and is partially high-frequency quenched; the differential tooth gasket (2) is made of 65Mn spring steel and is heat-treated to a Rockwell hardness of HRC55-62 and then surface-finished; the spline hole differential gear (3) has 12 teeth and is pressed with powder metallurgy material FN0208 and then sintered to a Rockwell hardness of HRC35-43; the φ18 shaft retaining ring (4) is made of black 65Mn spring steel; the 43-tooth differential gear (5) is made of powder metallurgy and copper material The material SFT41231+15% CU is pressed and sintered to a Rockwell hardness of HRC35-43 degrees, which is beneficial to toughness; the circular hole differential gear (6) has 12 teeth and is pressed with powder metallurgy material FN0208 and sintered to a Rockwell hardness of HRC35-43 degrees; the differential gear drive pin (7) is made of 20CrMo, i.e., 20# chromium-molybdenum medium carbon steel, and is subjected to a quenching heat treatment process of carbon-nitrogen-boron co-diffusion to make the diffusion layer 0.6-1mm to a Rockwell hardness of HRC55-62 degrees, which is beneficial to inner softness and outer steel; the short output shaft (8) is made of 40Cr medium carbon steel and is subjected to local high frequency quenching heat treatment to make the diffusion layer 0.6-1mm. The TC skeleton oil seal (9) is a double-lip seal with a self-tightening spring completely covered with oil-resistant rubber, which is beneficial to oil-resistant sealing; the three-stage 34-tooth driven gear (10) is pressed with powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees, which is beneficial to wear resistance; the intermediate shaft spacer (11) is pressed with powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees; the intermediate spline shaft (12) is made of 20CrMn, i.e., 20# chromium manganese medium carbon steel, and is carbonitrided and boronized to make the infiltration layer 0.The quenching heat treatment process of 6-1mm to the Rockwell hardness HRC55-62 degrees is beneficial to the inner softness and outer steel; the sleeve gasket (13) is made of 65Mn, that is, spring steel 65 manganese, and is quenched and tempered to the Rockwell hardness HRC55-62 degrees and polished to improve the rigidity and reduce the internal stress; the 13-tooth differential pinion (14) is pressed with powder metallurgy material FN0208 and then sintered to the Rockwell hardness HRC35-43 degrees, which is beneficial to wear resistance; the square support sleeve (15) has a plurality of supporting functions on each shaft, and is pressed with iron-copper alloy FC0205-40, which is oil-containing. In order to make it more smoothly lubricated, an important improvement and significant feature is that a plurality of radial straight grooves (15) are provided on each square support sleeve (15). a) and radial inclined grooves (15b) and axial straight grooves (15c), which increase the oil flow channels, and the outer contour of the square support sleeve is changed from the original round to square, which increases the outer contour gap, which is conducive to improving oil flow lubrication; further improvement, not only the outer contour of the square support sleeve is changed from the original round to square, but also a plurality of protruding blade fan fins (15d) are provided on the outer contour of the square support sleeve, which is more conducive to improving oil flow lubrication, but the blade fan fins should not be raised too high to avoid excessive power consumption; the three-stage 11-tooth driving gear (16) has 11 teeth and is pressed from powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees, so as to reduce gear shaping machine processing; the shift shaft (17) is made of 20CrMn, i.e., 20# chromium manganese medium carbon steel, and is carbonitrided to a carburized layer of 0.The gear shift shaft sleeve (18) is made of powder metallurgy material FN0208 and then sintered to a Rockwell hardness of HRC35-43. The gear shift shaft fork assembly (19) is provided with a neutral position (98) to match the neutral flashing device and the gear shift fork (53). The left end of the semi-circular fork arm of the front part of the gear shift shaft fork assembly (19) is provided with a left fork hand (81), the right end of the semi-circular fork arm of the front part of the gear shift shaft fork assembly (19) is provided with a right fork hand (82), and the middle part of the right end of the semi-circular fork arm of the front part of the gear shift shaft fork assembly (19) is provided with two gear position screws (84). A fixing platform is also provided at the middle of the right end of the semicircular fork arm of the front part of the fork shift shaft fork assembly (19) so as to fix the powder metallurgy gear (90), and the powder metallurgy gear (90) is provided with a tightening platform for precision tapping that can fix the two gear screws (84), and the powder metallurgy gear (90) is provided with a first gear (91), a second gear (92), a third gear (93), a fourth gear (94), a fifth gear (95), a sixth gear (96), and a seventh gear (97) which are arranged in sequence according to a quarter arc with the rotating shaft of the fork shift shaft fork assembly (19) as the rotating shaft, and the first gear (91), the second gear (92), the third gear (93), the fourth gear (94), the fifth gear (95), the sixth gear (96), and the seventh gear (97) are arranged in sequence according to a quarter arc, and the first gear (91), the second gear (9 2) The concave arc of each of the third gear (93), the fourth gear (94), the fifth gear (95), the sixth gear (96) and the seventh gear (97) is a section of a logarithmic spiral so as to utilize the characteristic that the pressure angle of the logarithmic function is equal everywhere and is beneficial to uniform force, or the concave arc of each gear is a parabolic pit slightly shallower than the semicircular pit so as to reduce resistance and smoothly shift gears; the rocker arm square shaft (20) is made of 40 chromium medium carbon alloy steel 40Cr tempered; the φ28 shaft retaining ring (21) is made of 65Mn, i.e. spring steel 65 manganese, which is subjected to quenching and tempering heat treatment process to Rockwell hardness HRC55-62 degrees and is subjected to surface blackening treatment to be beneficial to service life; the butterfly gasket (22) is a plurality of spring steel 65 manganese After quenching and tempering heat treatment to Rockwell hardness HRC45-53 degrees; the reverse gear 25-tooth driven gear (23) is pressed by powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees, which is beneficial to durability and less machining; the neutral shaft sleeve (24) is pressed by powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees. In order to make it work more smoothly, the important improvement and significant feature is that the inner ring of the neutral shaft sleeve (24) is provided with a cross-section opening angle of 116 degrees and a fan-shaped opening angle (24a) with straight edges on both sides, which is beneficial to match the head angle (53a) of the shift fork (53) with an outer opening angle of 111 degrees of 69 degrees, and the clearance angle on each side is 2.5 degrees, and the experiment shows that it is an adapted sliding key, which is easier to pop up and easier to get stuck in; in order to solve the problem that the control steel shaft of the shift shaft fork assembly (19) and the aluminum die-casting, that is, the left and right ends of the semicircular fork arms of the front part are provided with left and right fork hands, the important improved feature is that a spline or a flattened die-casting insert (19a) is preset on the control steel shaft of the shift shaft fork assembly (19) to facilitate reliable die-casting as a whole, and the left fork hand (81) and the right fork hand (82) are also preset as pre-embedded blocks of steel with large and small heads, which are formed together in the die-casting mold, and the position of the spline or the flattened die-casting insert (19a) preset on the control steel shaft is the projection area of ​​the control steel shaft in the neutral position (98); the first gear 35-tooth driven gear (25), the second gear 30-tooth driven gear (26), the third gear 25-tooth driven gear (27), the fourth gear 23-tooth driven gear The wheel (28) and the five-speed 20-tooth driven gear (29) are all made of powder metallurgy material FN0208 pressed and then sintered to Rockwell hardness HRC35-43 degrees, which is beneficial to durability and less machining; the shift shaft gasket (30) is made of SPCC blue-white zinc plated to prevent rust; the brake fixing bracket (31) is made of ADC12 insert screw die-casting to prevent impact load; the brake limit bracket (32) is made of SPCC blue-white zinc plated; the M8 nylon anti-loosening nut (33) is made of 35 steel blue-white zinc plated to prevent rust; the 8.8-level thin head flat square bolt (34) is made of A3 steel as a high-strength bolt; the brake nut gasket (35) is made of SPCC blue-white zinc plated to prevent rust; the 10.9-level external hexagon flange bolt (36) is made of 45 steel as a high-strength bolt, 21 of which are all black; the TC skeleton oil seal (37) is φ15.8 and made of NBR Ding. The brake disc (38) is made of gray iron F1001G and treated to a Brinell hardness of HB100 degrees; the primary spline shaft (39) is made of 20CrMo, i.e., 20# chromium-molybdenum medium carbon steel, and is subjected to a quenching heat treatment process to carburize the carburized layer to a thickness of 0.6-1 mm to a Rockwell hardness of HRC56-61 degrees, which is beneficial to the inner softness and the outer steel; the fifth gear 30-tooth driving gear (40), the fourth gear 26-tooth driving gear (41), the third gear 25-tooth driving gear (42), the second gear 20-tooth driving gear (43), and the first gear 15-tooth driving gear (44) are all made of powder metallurgy material FN0208, which is pressed and then sintered to a Rockwell hardness of HRC35-43 degrees, which is beneficial to durability and less machining. The reverse gear driving gear (45) and the input driven gear (46) are made of low alloy powder metallurgy material SMF5040, which is pressed and sintered to Rockwell hardness HRC35-43 degrees to be durable; the brake adjustment plate (47) is made of 45 steel, which is nitrided and blackened to be durable; the brake compression spring (48) is made of 65Mn steel wire φ1.1, that is, spring steel 65 manganese, which is normalized and heat treated to be beneficial to elasticity and reduce internal stress; the brake pad (49) is made of 65Mn spring steel 65 manganese, which is quenched and tempered to reduce internal stress; the brake pad (50) is asbestos-free to be environmentally friendly; the semicircular key (51) is easy to process and install; the cylindrical pin (52 ) is made of GCr15 high carbon chromium bearing steel after quenching and low temperature tempering to achieve wear resistance and contact fatigue; the shift fork (53) is made of 65Mn spring steel 65 manganese material after medium wire cutting, tempering heat treatment to HRC52-58 degrees and then shot peening to reduce internal stress and fatigue resistance; the shift limit seat (54) is pressed with powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees to facilitate durability; the 8.8 grade hexagon socket bolt (55) is made of A3 steel as a high-strength bolt; in order to ensure the reliability of shifting, the modified shift fork neutral flash riding lawn mower gearbox is provided with a hexagon socket thread plug (56), a shift limit spring (57), a solid steel The gear shift adjusting torque device is composed of a solid steel ball (58) so as to coordinate with the first gear (91), the second gear (92), the third gear (93), the fourth gear (94), the fifth gear (95), the sixth gear (96) and the seventh gear (97) arranged in sequence in a quarter arc with the rotating shaft of the gear shift fork assembly (19) as the rotating shaft, and the solid steel ball (58) can accurately find the position of each gear to smoothly shift gears; the hexagonal thread plug (56) is made of A3 material with blackening treatment; the gear shift limit spring (57) is made of 65Mn spring steel wire φ1.1 that is, the spring steel wire 65 manganese is heat-treated and plated with blue-white zinc to prevent rust; the solid steel ball (58) is made of GCr15 high carbon chromium bearing steel, which is quenched to HRC50-62 degrees and then polished to achieve wear resistance and contact fatigue as well as durability and noise reduction; the neutral switch (59) is shaped like a bolt and nut to facilitate fixing, but is actually a normally closed switch with a flashing circuit; the neutral switch O-ring (60) is made of NBR. The shaft retaining ring (61) is made of 65Mn spring steel 65 manganese after heat treatment and its surface is blackened to prevent rust; the input driving gear (62) is 13 teeth and is made of 5040SMF powder metallurgy material pressed and sintered to achieve Rockwell hardness HRC35-43 degrees for toughness and less machining; the SCE108 stamped outer ring needle roller bearing (63) has two; the black TC skeleton oil seal (64) is made of NBR The input shaft (65) is made of 20CrMo, i.e., 20# chromium-molybdenum medium carbon steel, which is carburized to a carburized layer of 0.6-1mm and then quenched to a Rockwell hardness of HRC56-61, which is beneficial to the toughness of the outer steel and the inner softness; the open retaining ring (66) is made of 65Mn spring steel in black; the input shaft clamping pad (67) is made of 65Mn spring steel; the input shaft O-ring (68) is made of NBR The shift fork O-ring (69) is made of NBR rubber; the upper shell (70) of the riding lawn mower gearbox and the lower shell (71) of the riding lawn mower gearbox are both made of die-cast aluminum material ADC12 and formed by an 800-ton die-casting machine; the two-dimensional code sticker (72) is made of silver paper; the lubricating blending grease (73) is made of 350g and 500g of lubricating oil to bear heavy loads; in order to promote the circulation of lubricating blending grease, a plurality of oil-passing grooves (99) are provided between the upper shell (70) of the riding lawn mower gearbox and the lower shell (71) of the riding lawn mower gearbox and the long output shaft (1) and the short output shaft (8); because of the weakness of the non-constant elongation of the pull rope, the gear shift shaft of the riding lawn mower gearbox is transmitted from the rider's feeling lever to the gear shift shaft of the riding lawn mower gearbox. The shifting swinging condition on the control steel shaft of the fork assembly (19), especially the anxiety of confirming whether the neutral gear is in place, requires that a neutral position (98) be provided on the rotating shaft of the shifting shaft fork assembly (19) so as to cooperate with the neutral switch (59) and the flashing circuit installed on the housing; the neutral switch (59) comprises a neutral ball head (59a), a neutral ball top spring (59b) and a switch single pole (59c), together with two terminals, to form a practical single-pole double-throw micro switch SB. When the neutral ball head (59a) enters the neutral position, the switch single pole (59c) of SB is closed with an upper terminal. When the neutral ball head (59a) is not in the neutral position, the switch single pole (59c) of the single-pole double-throw micro switch SB is closed with a lower terminal. The circuit contacts of the square are closed, together with several red and green light emitting diodes that can be used as indicator lights on the steering wheel and the gearbox housing as tail lights, a simple astable self-excited multivibrator is built to form a neutral flashing circuit; the neutral flashing circuit includes the single-pole double-throw micro switch SB, the main power switch S2, the night tail light working switch S1, the first resistor R1 is 220 ohms, the second resistor R2 is 33K, the third resistor R3 is 33K, the fourth resistor R4 is 220 ohms, the first silicon NPN transistor VT1, the second silicon NPN transistor VT2, the first electrolytic capacitor C1 is 33 microfarads, the second electrolytic capacitor C2 is 33 microfarads, the third electrolytic capacitor C3 is 100 microfarads, the battery CELL, the first light emitting diode LED1 is red , the fifth light emitting diode LED5 is red, the third light emitting diode LED3 is green, and the seventh light emitting diode LED7 is red; when in neutral, the single-pole double-throw micro switch SB is in the dynamic closing position, that is, the upward position shown in the figure; when not in neutral, the single-pole double-throw micro switch SB is in the static closing position, that is, the downward position shown in the figure; when in neutral, the single-pole double-throw micro switch SB is in the dynamic closing position, that is, the upward position shown in the figure, and the main power switch S2 is closed. Since the taillight working switch S1 is in the open position at night, the upper ends of the second resistor R2 and the third resistor R3 are suspended, and the self-excited multivibrator composed of the first silicon NPN transistor VT1 and the second silicon NPN transistor VT2 stops oscillating due to the lack of base bias current, and the light-emitting tubes are not lit;When the driving operating handle drives the pull rope to the control steel shaft of the gear shift shaft fork assembly (19) of the riding lawn mower gearbox to shift gears, the side of the approximately similar logarithmic curve of the neutral position (98) provided on the rotating shaft of the gear shift shaft fork assembly (19) pushes out the neutral ball head (59a), causing the neutral ball top spring (59b) to be compressed and the switch single pole (59c) to make the single pole double throw micro switch SB fall downward, the second resistor R2 and the upper end of the third resistor R3 are connected, and the self-excited multivibrator composed of the first silicon NPN transistor VT1 and the second silicon NPN transistor VT2 forms a self-excited multivibrator due to the base bias current. The self-excited multivibrator is energized and immediately starts to oscillate, and the first silicon NPN transistor VT1 and the second silicon NPN transistor VT2 are connected. The N transistor VT2 is turned on and off in turn, and the red fifth light emitting diode and the red seventh light emitting diode LED7 flash alternately to indicate that the gearbox is shifting; sometimes, when working at night or in dark rain and fog, the night taillight working switch S1 can be closed. At this time, the second resistor R2 and the third resistor R3 can provide base bias current for the first silicon NPN transistor VT1 and the second silicon NPN transistor VT2 through the night taillight working switch S1. Regardless of whether the gear is in neutral or not, the self-excited multivibrator can also start to oscillate. At this time, the red light emitting diode LED1 and the green light emitting diode LED3 flash alternately, which can play a good decorative effect and notice role, forming a modified fork neutral flashing riding lawn mower gearbox. ;

[0031] Key points:

[0032] The modified gearbox of the shift fork neutral flashing riding lawn mower is carefully selected and processed and precisely manufactured, so that the service life is increased, the gear position is accurate, the effect is remarkable, the operation is convenient, the lubrication is improved, the noise is reduced, and the neutral flashing improves the quality; a square support shaft sleeve (15) is provided with a plurality of radial straight grooves (15a) and radial inclined grooves (15b) and an axial straight groove (15c); a neutral switch (59) and a flashing circuit are provided on the shift shaft fork assembly (19); the neutral switch (59) comprises a neutral ball head (59a), a neutral ball top spring (59b) and a switch single pole (59c) to form a single-pole double-throw micro switch SB, and a red and green light-emitting diode used as an indicator light on the steering wheel and a gearbox housing as a tail light to build an astable self-excited multivibrator to form a neutral flashing circuit for alternating indication. The inner ring of the neutral shaft sleeve (24) is provided with a cross-section with an opening angle of 116 degrees and a fan-shaped opening angle (24a) with straight edges on both sides, so as to be compatible with the head angle (53a) of the shift fork (53) of 69 degrees.

Claims

1. A modified gearbox for a riding lawn mower with a neutral flashing display of a fork, characterized in that: The invention comprises a long output shaft (1), a differential tooth gasket (2), a spline hole differential gear (3), a φ18 shaft retaining spring (4), a 43-tooth differential large gear (5), a round hole differential gear (6), a differential gear drive pin (7), a short output shaft (8), a TC skeleton oil seal (9), a three-stage 34-tooth driven gear (10), an intermediate shaft spacer (11), an intermediate spline sleeve (12), a sleeve gasket (13), a 13-tooth differential pinion (14), a square support sleeve (15), a three-stage 11-tooth driving gear (16), a shift shaft (17), a shift shaft sleeve (18), a shift shaft fork assembly (19), a rocker arm square shaft (20), a φ28 shaft retaining ring (21), a butterfly gasket (22), an inverted 25-tooth driven gear brake pad (50), semicircular key (51), cylindrical pin (52), shift fork (53), shift limit seat (54), 8.8-grade hexagon socket bolt (55), hexagon socket thread plug (56), shift limit spring (57), solid steel ball (58), neutral switch (59), neutral switch O-ring (60), shaft retaining ring (61), input driving gear (62), SCE108 stamped outer ring needle roller bearing (63), black TC skeleton oil seal (64), input shaft (65), open retaining ring (66), input shaft clamping gasket (67), input shaft O-ring (68), shift fork O-ring (69), riding lawn mower gearbox upper shell (70), A riding lawn mower gearbox lower shell (71), a QR code sticker (72), and a lubricating blending grease (73); the long output shaft (1) is made of 40Cr medium carbon steel and is partially high-frequency quenched; the differential tooth gasket (2) is made of 65Mn spring steel and is heat-treated to a Rockwell hardness of HRC55-62 and then surface-finished; the spline hole differential gear (3) has 12 teeth and is pressed from powder metallurgy material FN0208 and then sintered to a Rockwell hardness of HRC35-43; the φ18 shaft retaining ring (4) is made of blackened 65Mn spring steel; the 43-tooth differential gear (5) is made of powder metallurgy copper material SFT41231+1 5% CU pressed and sintered to Rockwell hardness HRC35-43 degrees; the circular hole differential gear (6) has 12 teeth and is pressed with powder metallurgy material FN0208 and sintered to Rockwell hardness HRC35-43 degrees; the differential gear drive pin (7) is made of 20CrMo, i.e., 20# chromium-molybdenum medium carbon steel, and is subjected to carbon-nitrogen-boron co-infiltration to make the infiltration layer 0.6-1mm and quenching heat treatment process to Rockwell hardness HRC55-62 degrees; the short output shaft (8) is made of 40Cr medium carbon steel and is locally high-frequency quenched; the TC skeleton oil seal (9) is a double-lip seal with a self-tightening spring completely covered with oil-resistant rubber; the third-stage 34-tooth driven gear (10) The powder metallurgy material FN0208 is pressed and then sintered to a Rockwell hardness of HRC35-43 degrees; the intermediate shaft spacer (11) is pressed and then sintered to a Rockwell hardness of HRC35-43 degrees with a powder metallurgy material FN0208; the intermediate spline shaft (12) is made of 20CrMn, i.e., 20# chromium manganese medium carbon steel, and carbon-nitrogen-boron co-diffused to make the infiltration layer 0.6-1mm, and quenched to a Rockwell hardness of HRC55-62 degrees; the shaft sleeve gasket (13) is made of 65Mn, i.e., spring steel 65 manganese, and is quenched and tempered to a Rockwell hardness of HRC55-62 degrees and is polished; the 13-tooth differential pinion (14) is made of powder metallurgy material FN 0208 pressed and then sintered to Rockwell hardness HRC35-43 degrees; the square support sleeve (15) has multiple, is pressed with iron copper alloy FC0205-40, is provided with multiple radial straight grooves (15a) and radial inclined grooves (15b) and axial straight grooves (15c), the outer contour of the square support sleeve is square, and multiple protruding blade fins (15d) are provided on the outer contour; the three-stage 11-tooth driving gear (16) is 11 teeth and is pressed with powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees; the shift shaft (17) is made of 20CrMn, i.e., 20# chromium manganese medium carbon steel, and is carbonitrided and boronized to make the infiltration layer 0.6-1mm quenching heat treatment to Rockwell hardness HRC55-62 degrees; the shift shaft sleeve (18) is pressed with powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees; the shift shaft fork assembly (19) is provided with a neutral position (98) to match the neutral flashing device and the shift fork (53); the left end of the semicircular arc fork arm at the front of the shift shaft fork assembly (19) is provided with a left fork hand (81), the right end of the semicircular arc fork arm at the front of the shift fork shift shaft fork assembly (19) is provided with a right fork hand (82), the middle part of the right end of the semicircular arc fork arm at the front of the shift shaft fork assembly (19) is provided with two gear screws (84) and a fixing platform is also provided at the right end to fix the powder metallurgy gear (90), and the powder metallurgy gear (90) is provided with a fixing plate for fixing the two gear screws The powder metallurgy gear position (90) is provided with a first gear position (91), a second gear position (92), a third gear position (93), a fourth gear position (94), a fifth gear position (95), a sixth gear position (96), and a seventh gear position (97) which are arranged in sequence according to a quarter arc with the rotating shaft of the fork shift shaft fork assembly (19) as the rotating shaft. The concave arc of each of the first gear position (91), the second gear position (92), the third gear position (93), the fourth gear position (94), the fifth gear position (95), the sixth gear position (96), and the seventh gear position (97) is a section of a logarithmic spiral, and the concave arc of each gear is a parabolic pit slightly shallower than a semicircular pit; the shift shaft (17) is made of 20CrMn, i.e., 20# chromium manganese medium carbon steel, and is carbonitrided with boron to make the infiltration layer 0.6-1mm quenching heat treatment to Rockwell hardness HRC55-62 degrees; the shift shaft sleeve (18) is pressed with powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees; the shift shaft fork assembly (19) is provided with a neutral position (98) to cooperate with the neutral flashing device and the shift fork (53); the rocker arm square shaft (20) is tempered with 40 chromium medium carbon alloy steel 40Cr; the φ28 shaft retaining ring (21) is made of 65Mn, i.e. spring steel 65 manganese, through quenching and tempering heat treatment process to Rockwell hardness HRC55-62 degrees and blackened on the surface; the butterfly gasket (22) is a plurality of spring steel 65 manganese is subjected to quenching and tempering heat treatment to a Rockwell hardness of HRC45-53 degrees; the reverse gear 25-tooth driven gear (23) is pressed by powder metallurgy material FN0208 and then sintered to a Rockwell hardness of HRC35-43 degrees; the neutral shaft sleeve (24) is pressed by powder metallurgy material FN0208 and then sintered to a Rockwell hardness of HRC35-43 degrees; the inner ring of the neutral shaft sleeve (24) is provided with a cross-section opening angle of 116 degrees and a fan-shaped opening angle (24a) with straight edges on both sides, which matches the head angle (53a) of the shift fork (53) of 69 degrees; the control steel shaft of the shift shaft fork assembly (19) is preset with a spline or a flattened The die-cast insert (19a) is die-cast as a whole; the left fork hand (81) and the right fork hand (82) are also preset as pre-inserted steel blocks with large and small heads, and are formed together in the die-casting mold; the position of the die-cast insert (19a) preset with splines or flattened on the control steel shaft is the projection area of ​​the control steel shaft in the neutral position (98); the first gear 35-tooth driven gear (25), the second gear 30-tooth driven gear (26), the third gear 25-tooth driven gear (27), the fourth gear 23-tooth driven gear (28), and the fifth gear 20-tooth driven gear (29) are all pressed with powder metallurgy material FN0208 and then sintered to a Rockwell hardness of HRC3 5-43 degrees; the shift shaft gasket (30) is made of SPCC blue-white zinc-plated; the brake fixing bracket (31) is made of ADC12 insert screw die-casting; the brake limit bracket (32) is made of SPCC blue-white zinc-plated; the M8 nylon anti-loosening nut (33) is made of 35 steel blue-white zinc-plated; the 8.8-grade thin-head flat square bolt (34) is made of A3 steel as a high-strength bolt; the brake nut gasket (35) is made of SPCC blue-white zinc-plated; the 10.9-grade external hexagon flange bolt (36) is made of 45 steel as a high-strength bolt, 21 of which are all black; the TC skeleton oil seal (37) is φ15.8 and made of NBR Ding. rubber; the brake disc (38) is made of gray iron F1001G and treated to a Brinell hardness of HB100; the primary spline shaft (39) is made of 20CrMo, i.e., 20# chromium-molybdenum medium carbon steel, and is carburized to a carburized layer of 0.6-1 mm and subjected to a quenching heat treatment process to a Rockwell hardness of HRC56-61; the fifth gear 30-tooth driving gear (40), the fourth gear 26-tooth driving gear (41), the third gear 25-tooth driving gear (42), the second gear 20-tooth driving gear (43), and the first gear 15-tooth driving gear (44) are all made of powder metallurgy material FN0208 pressed and then sintered to a Rockwell hardness of HRC35-43; the reverse gear driving gear (45) and the input driven gear (46) are made of The brake adjustment plate (47) is made of 45 steel and nitrided; the brake compression spring (48) is made of 65Mn steel wire φ1.1, i.e., spring steel 65 manganese and normalized; the brake pad (49) is made of 65Mn spring steel 65 manganese and tempered; the brake pad (50) is asbestos-free for environmental protection; the semicircular key (51) is semicircular; the cylindrical pin (52) is made of GCr15 high carbon chromium bearing steel and quenched and low temperature tempered; the shift fork (53) is made of 65Mn spring steel 65 manganese material and tempered and heat treated to HRC52 after cutting with medium wire. -58 degrees and then shot peened; the shift limit seat (54) is pressed with powder metallurgy material FN0208 and then sintered to Rockwell hardness HRC35-43 degrees; the 8.8 grade hexagon socket bolt (55) is made of A3 steel as a high-strength bolt; the modified shift fork neutral flash riding lawn mower gearbox is provided with a shift adjustment torque device consisting of a hexagon socket thread plug (56), a shift limit spring (57), and a solid steel ball (58), which is provided on the powder metallurgy gear position (90) on the shift shaft fork assembly (19) with the rotating shaft of the shift fork shift shaft fork assembly (19) as the rotating shaft and is densely arranged in sequence according to a quarter arc. The third gear position (93), the fourth gear position (94), the fifth gear position (95), the sixth gear position (96) and the seventh gear position (97) are matched, and the gears are shifted by the solid steel ball (58) in each position; the hexagonal thread plug (56) is made of A3 material and blackened; the shift limit spring (57) is made of 65Mn spring steel wire φ1.1, that is, spring steel wire 65 manganese, heat-treated and blue-white zinc-plated; the solid steel ball (58) is made of GCr15 high-carbon chromium bearing steel, quenched to HRC50-62 degrees and then polished; the appearance of the neutral switch (59) is like a bolt nut fixed, but it is actually a normally closed switch with a flashing circuit; the neutral switch O-ring (60) is made of NBR butadiene-styrene (NBR) ... rubber; the shaft retaining ring (61) is made of 65Mn, i.e. spring steel 65 manganese, which is heat-treated and has a black surface; the input driving gear (62) is 13 teeth and is made of 5040SMF powder metallurgy material pressed and sintered to achieve a Rockwell hardness of HRC35-43 degrees; there are two SCE108 stamped outer ring needle roller bearings (63); the black TC skeleton oil seal (64) is made of NBR butadiene The input shaft (65) is made of 20CrMo, i.e., 20# chromium-molybdenum medium carbon steel, which is carburized to a carburized layer of 0.6-1mm and then quenched and heat treated to a Rockwell hardness of HRC56-61 degrees; the open retaining ring (66) is made of 65Mn spring steel in black; the input shaft clamping pad (67) is made of 65Mn spring steel; the input shaft O-ring (68) is made of NBR butadiene The shift fork O-ring (69) is made of NBR rubber; the riding lawn mower gearbox upper shell (70) and the riding lawn mower gearbox lower shell (71) are both made of die-cast aluminum material ADC12 and formed by an 800-ton die-casting machine; the two-dimensional code sticker (72) is made of silver paper; the lubricating blending grease (73) is blended from 350g and 500g of lubricating oil; a plurality of oil-passing grooves (99) are provided between the riding lawn mower gearbox upper shell (70) and the riding lawn mower gearbox lower shell (71) and the long output shaft (1) and the short output shaft (8); the neutral gear flashing device includes a neutral gear position (98) and a neutral gear position (99) provided on the rotating shaft of the shift shaft fork assembly (19); The neutral switch (59) and the flashing circuit installed on the housing are matched; the neutral switch (59) includes a neutral ball head (59a), a neutral ball top spring (59b) and a switch single pole (59c), together with two terminals, to form a practical single-pole double-throw micro switch SB. When the neutral ball head (59a) enters the neutral position, the switch single pole (59c) of SB is closed with an upper terminal. When the neutral ball head (59a) is not in the neutral position, the switch single pole (59c) of the single-pole double-throw micro switch SB is closed with the circuit contact below. Together with several red and green light-emitting diodes that can be used as indicator lights on the steering wheel and as tail lights on the gearbox housing, a simple single-pole double-throw micro switch SB is constructed. The astable self-excited multivibrator forms a neutral flashing circuit; the neutral flashing circuit comprises the single-pole double-throw micro switch SB, the main power switch S2, the night taillight working switch S1, the first resistor R1 is 220 ohms, the second resistor R2 is 33K, the third resistor R3 is 33K, the fourth resistor R4 is 220 ohms, the first silicon NPN transistor VT1, the second silicon NPN transistor VT2, the first electrolytic capacitor C1 is 33 microfarads, the second electrolytic capacitor C2 is 33 microfarads, the third electrolytic capacitor C3 is 100 microfarads, the battery CELL, the first light emitting diode LED1 is red, the fifth light emitting diode LED5 is red, and the third light emitting diode LED6 is red. The light emitting diode LED3 is green, and the seventh light emitting diode LED7 is red; when in neutral, the single-pole double-throw micro switch SB is in the dynamic closing position, i.e., the upward position; when not in neutral, the single-pole double-throw micro switch SB is in the static closing position, i.e., the downward position; when in neutral, the single-pole double-throw micro switch SB is in the dynamic closing position, i.e., the upward position, and the main power switch S2 is closed. Since the taillight working switch S1 is in the open position at night, the upper ends of the second resistor R2 and the third resistor R3 are suspended, and the self-excited multivibrator composed of the first silicon NPN transistor VT1 and the second silicon NPN transistor VT2 stops oscillating due to the lack of base bias current, and the light emitting tubes are not lit;When the driving operating handle drives the pull rope to the control steel shaft of the gear shift shaft fork assembly (19) of the riding lawn mower gearbox to shift gears, the side of the approximately similar logarithmic curve of the neutral position (98) provided on the rotating shaft of the gear shift shaft fork assembly (19) pushes out the neutral ball head (59a), causing the neutral ball top spring (59b) to be compressed and the switch single pole (59c) to cause the single pole double throw micro switch SB to fall downward, the second resistor R2 and the upper end of the third resistor R3 are connected, and the self-excited multivibrator composed of the first silicon NPN transistor VT1 and the second silicon NPN transistor VT2 forms a self-excited multivibrator due to the base bias current. The self-excited multivibrator is energized and immediately starts to oscillate, and the first silicon NPN transistor VT1 and the second silicon NPN transistor VT2 are turned on and off in turn, and the red fifth light emitting diode and the red seventh light emitting diode LED5 LED7 flash alternately to indicate that the gearbox is shifting; sometimes at night or in dark rain and fog, the night taillight working switch S1 can be closed, and the second resistor R2 and the third resistor R3 can provide base bias current for the first silicon NPN transistor VT1 and the second silicon NPN transistor VT2 through the night taillight working switch S1. Regardless of whether the gear is in neutral or not, the self-excited multivibrator can also start oscillation. At this time, the red light emitting diode LED1 and the green light emitting diode LED3 flash alternately, forming a modified fork neutral flashing riding lawn mower gearbox. ;

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