Hand Tool Multiple-Speed Ratchet Assembly

Abstract

The present invention discloses a hand tool multiple-speed variable ratchet assembly. A positioning pin is installed at the upper end of the main body seat. The variable-speed gear is sleeved with the positioning pin. After the variable-speed internal gear ring is installed on the main body seat, all three variable-speed gears are synchronously meshed with the internal gear. After the snap ring I of the ratchet rod is installed in the snap ring groove II, the ratchet rod is inserted into the middle hole of the adjusting ring cover, passes through downward and the end exposes the lower end surface of the main body seat. The snap ring II is installed in the snap ring groove I, and the fixed end is located between the circular holes formed by the inner circumferences of the roller I and the roller II and the axial positions correspond. The external gear is meshed with the three variable-speed gears and can drive. The present invention has three working modes: left and right rotation lock, left rotation lock, and right rotation lock. When the main body seat is rotated to synchronously drive the ratchet rod to rotate, the hand holds the outside of the variable-speed gear cover to synchronously make the variable-speed internal gear ring not rotate, and the variable-speed gear and the variable-speed gear cover generate multiple rotations, and the corresponding multiple drives the ratchet rod to rotate variably, improving work efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of hand tools, in particular to a hand tool multiple-speed ratchet assembly. Background Art

[0002] As a conventional connecting and fixing component, a screw is connected by rotating the thread of the screw and the screw hole and converted into linear tension, and is widely used in the connection of various types of product components. In mass production, mostly electric screwdrivers or pneumatic screwdrivers are used. However, in reality, in families or ordinary daily repairs, basically ordinary hand-held screwdriver-like hand tools that apply force manually by rotation are used, and left-handed one-way screwdrivers and right-handed one-way screwdrivers are required. For conventional hand tools, generally, when the handle is rotated one circle, the hand tool drives the bit to rotate one circle synchronously, tightening or loosening the screw one circle. There is no problem in theory and operation, but at the same time, there is the disadvantage of low efficiency. Especially for some long screws with a small pitch, such as a pitch of 1 mm and a thread length of 60 mm, when rotated one circle, the thread advances or retreats 1 mm, then 60 circles need to be rotated to achieve tightness or complete removal. It takes a long time, the work efficiency is low, and the wrist aches. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned deficiencies of the prior art and provide a hand tool multiple-speed ratchet assembly. A positioning pin is installed at the upper end of the main body seat. The variable-speed gear is sleeved with the positioning pin. After the variable-speed internal gear ring is installed with the main body seat, all three variable-speed gears are synchronously meshed with the internal gear. After the snap ring one of the ratchet rod is installed in the snap ring groove two, the ratchet rod is inserted into the middle hole of the adjusting ring cover, passes through downward and the end exposes the lower end surface of the main body seat. The snap ring two is installed in the snap ring groove one, and the fixed end is located between the circular holes formed by the inner circumferences of the roller one and the roller two and the axial positions correspond. The external teeth are meshed with the three variable-speed gears and can transmit power. The present invention has three working modes: left and right rotation lock, left rotation lock, and right rotation lock. When the main body seat is rotated to drive the ratchet rod to rotate synchronously, the hand holds the outside of the variable-speed gear cover and synchronously makes the variable-speed internal gear ring not rotate. The variable-speed gear and the variable-speed gear cover generate multiple rotations, and the corresponding multiple drives the ratchet rod to rotate variably, improving work efficiency.

[0004] To achieve the above object, the present invention provides a hand tool multiple-speed ratchet assembly, including a ratchet rod, an adjusting ring cover, a fork, a roller one, a roller two, a spring one, a roller seat, a variable-speed gear cover, a variable-speed internal gear ring, a positioning pin, a variable-speed gear, and a main body seat. The upper and lower ends of the step of the flange of the main body seat provided with a middle hole are respectively provided with a seat body and a spline shaft. The outer circumference of the spline shaft is evenly distributed with straight-tooth splines. Three spacer blocks are vertically and evenly distributed on the upper end surface of the seat body, and positioning holes are respectively arranged at the middle positions of the seat body between adjacent spacer blocks;

[0005] One end of the positioning pin is inserted and installed in the positioning hole, and the other end of the positioning pin extends upward from the end face of the seat body. The transmission gear is sleeved on the positioning pin, and the transmission gear after sleeving can rotate with the positioning pin as the base shaft;

[0006] The transmission internal gear ring is installed on the main body seat. After installation, the three transmission gears are all synchronously meshed with the internal gear. The upper end faces of the transmission gears are flush with the upper end face of the transmission internal gear ring. When the transmission internal gear ring rotates, it drives the three transmission gears to rotate synchronously. A number of straight teeth are evenly distributed on the outer circumference of the transmission internal gear ring;

[0007] Straight grooves are evenly distributed on the inner ring of the transmission gear outer cover. The transmission gear outer cover is sleeved on the transmission internal gear ring, and the straight grooves are embedded and meshed with the straight teeth;

[0008] The roller seat is provided with a through hole 1, and a roller mounting hole is provided at the upper end of the through hole 1. The inner wall of the roller mounting hole is formed by connecting three identical inner arc surfaces 901. The distance from both ends of the inner arc surface 901 to the through hole 1 is a1, and the distance from the middle position of the inner arc surface to the through hole 1 is a2. a1 gradually increases along the inner arc surface and transitions to the middle position a2. a2 is the maximum value, and a1 is the minimum value;

[0009] The first roller and the second roller are respectively loaded into the space formed by each inner arc surface. A first spring is loaded between the first roller and the second roller, and both ends of the first spring elastically abut against the circumferential walls of the first roller and the second roller respectively;

[0010] A spring mounting hole is provided on the upper end face of the roller seat. A second spring is installed in the spring mounting hole, and a steel ball is provided at the upper end of the second spring;

[0011] The main board of the shift fork is provided with a through hole and three hypotenuses 2 are evenly distributed on the outer circumference. Three shift fork rods extending downward are evenly distributed on the lower end face of the main board. The shift fork rods of the shift fork are stacked downward on the upper end face of the roller seat, and the lower end face of the main board elastically abuts against the steel ball. The shift fork rods are located at the positions between the adjacent first roller and the second roller in the roller mounting hole;

[0012] The roller seat with the shift fork installed is loaded into the inner ring of the transmission gear outer cover, and the lower end face abuts against the upper end face of the transmission internal gear ring;

[0013] Three arc surfaces are evenly distributed inside the adjusting ring cover. The arc surfaces are connected by three hypotenuses. The arc surfaces and the hypotenuses are correspondingly sleeved with the main board and the hypotenuse 2;

[0014] The lower end of the transmission rod of the ratchet lever is a fixed end. After the first snap ring 1 is installed in the second snap ring groove, the ratchet lever is inserted into the middle hole of the adjusting ring cover. After being connected with the adjusting ring cover, the ratchet lever penetrates downward through the shift fork, the roller seat, and the main body seat. The end of the connecting rod of the ratchet lever exposes from the lower end face of the main body seat. The second snap ring is installed in the first snap ring groove. The fixed end is located between the circular holes formed by the inner circumferences of the first roller and the second roller and the axial positions correspond. The external teeth are meshed with the three transmission gears and can transmit power.

[0015] Further setting: The specification of the straight groove conforms to the specification of the straight teeth.

[0016] Further setting: The clearance between the positioning pin and the positioning hole is not greater than 0.02 mm.

[0017] Further setting: A hexagonal hole is provided inside the upper end of the transmission rod.

[0018] Further setting: The number of internal teeth of the variable-speed internal gear ring is a multiple of the number of teeth of the variable-speed gear.

[0019] Further setting: The module of the internal teeth is the same as that of the variable-speed gear.

[0020] The beneficial effects of the present invention are as follows: The present invention has three working modes: left and right rotation locking, left rotation locking, and right rotation locking. When the rotating main body seat drives the ratchet rod to rotate synchronously, the hand holds the outside of the variable-speed gear housing to synchronously make the variable-speed internal gear ring not rotate, and the variable-speed gear and the variable-speed gear housing generate a multiple rotation, and the corresponding multiple drives the ratchet rod to rotate variably, improving work efficiency. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the present invention;

[0022] Figure 2 is Figure 1 an exploded view of

[0023] Figure 3 is Figure 2 a schematic diagram of the main body seat in

[0024] Figure 4 is Figure 2 a schematic diagram of the shift fork in

[0025] Figure 5 is Figure 2 a schematic diagram of the ratchet rod in

[0026] Figure 6 is Figure 2 a schematic diagram of the variable-speed internal gear ring in

[0027] Figure 7 is a state diagram of roller one and roller two in the roller seat when both left and right rotations are locked;

[0028] Figure 8 is a state diagram of roller one and roller two in the roller seat when the left rotation is locked and the right rotation is movable;

[0029] Figure 9 is a state diagram of roller one and roller two in the roller seat when the right rotation is locked and the left rotation is movable;

[0030] Figure 10 isFigure 7 Schematic diagram of the connection of three inner arc surfaces of the roller mounting hole;

[0031] Figure 11 For Figure 2 Schematic diagram of the adjusting ring cover 3 in

[0032] Figure 12 For Figure 2 Assembly schematic diagram of the ratchet lever 2, positioning pin 12, transmission gear 13 and main body seat 14 in

[0033] In the figure: circlip one 1, ratchet lever 2, external teeth 201, connecting rod 202, transmission rod 203, circlip groove 204, hexagonal hole 205, circlip groove two 206, fixed end 207, adjusting ring cover 3, arc surface 301, hypotenuse 302, fork 4, main board 401, fork rod 402, through hole 403, hypotenuse two 404, roller one 5, roller two 51, spring one 6, steel ball 7, spring two 8, roller seat 9, inner arc surface 901, spring mounting hole 902, roller mounting hole 903, through hole one 904, transmission gear outer cover 10, straight groove 1010, transmission inner gear ring 11, inner teeth 1101, straight teeth 1102, positioning pin 12, transmission gear 13, main body seat 14, step 1401, spline shaft 1402, seat body 1403, positioning hole 1404, middle hole 1405, spacer 1406, circlip two 15. Detailed implementation manners

[0034] As Figure 1 , Figure 2 , Figure 12 Shown: The technical solution of the present invention will be further specifically described. The hand tool multiple-speed ratchet assembly includes a ratchet lever 2, an adjusting ring cover 3, a fork 4, a roller one 5, a roller two 51, a spring one 6, a roller seat 9, a transmission gear outer cover 10, a transmission inner gear ring 11, a positioning pin 12, a transmission gear 13, and a main body seat 14. As Figure 3 Shown, on the upper and lower ends of the step 1401 of the flange of the main body seat 14 provided with the middle hole 1405, a seat body 1403 and a spline shaft 1402 are respectively provided. The outer circumference of the spline shaft 1402 is evenly distributed with straight-tooth splines. On the upper end surface of the seat body 1403, three spacers 1406 are vertically and evenly distributed. At the middle position of the seat body 1403 between adjacent spacers 1406, positioning holes 1404 are respectively provided; one end of the positioning pin 12 is inserted and installed and connected with the positioning hole 1404, and the other end of the positioning pin 12 extends upward from the end surface of the seat body 1403. The transmission gear 13 is sleeved on the positioning pin 12, and the sleeved transmission gear 13 can rotate with the positioning pin 12 as the base shaft;

[0035] The variable-speed internal gear ring 11 is installed with the main body seat 14. After installation, the three variable-speed gears 13 are all synchronously meshed with the internal teeth 1101. The upper end surfaces of the variable-speed gears 13 are flush with the upper end surface of the variable-speed internal gear ring 11. When the variable-speed internal gear ring 11 is rotated, it drives the three variable-speed gears 13 to rotate synchronously. When the main body seat 14 rotates, the three variable-speed gears 13 rotate synchronously and also drive the variable-speed internal gear ring 11 meshed with the three variable-speed gears 13 to rotate synchronously. As Figure 6 shown, a number of straight teeth 1102 are evenly distributed on the outer circumference of the variable-speed internal gear ring 11, and straight grooves 1010 are evenly distributed on the inner ring of the variable-speed gear outer cover 10. The variable-speed gear outer cover 10 is sleeved outside the variable-speed internal gear ring 11, which is conducive to the embedded meshing connection with the straight grooves 1010 of the variable-speed gear outer cover 10. When the main body seat 14 is rotated and the variable-speed gear outer cover 10 is manually fixed, the variable-speed internal gear ring 11 does not rotate. The three variable-speed gears 13 driven by the main body seat 14 generate relative gear rotation with the variable-speed internal gear ring 11. The rotation multiple of the variable-speed gears 13 is determined by the gear multiple of the variable-speed gears 13 and the variable-speed internal gear ring 11. When the number of teeth of the variable-speed gear 13 is 20 and the number of internal teeth of the variable-speed internal gear ring 11 is 100, the multiple is 1:5. When the variable-speed internal gear ring 11 is manually fixed and does not rotate, when the main body seat 14 rotates, when the main body seat 14 rotates one circle, the variable-speed gears 13 rotate variably by 5 circles at a multiple.

[0036] As Figure 10 shown, the roller seat 9 is provided with a first through hole 904, and a roller mounting hole 903 is provided at the upper end of the first through hole 904. The inner wall of the roller mounting hole 903 is formed by connecting three identical inner arc surfaces 901. The distance between both ends of the inner arc surface 901 from the first through hole 904 is a1, and the distance between the middle position of the inner arc surface 901 from the first through hole 904 is a2. a1 gradually increases along the inner arc surface 901 to the middle position a2, a2 is the maximum value, and a1 is the minimum value; a2 is greater than the diameters of the first roller 5 and the second roller 51, and a1 is less than the diameters of the first roller 5 and the second roller 51.

[0037] As Figure 7 shown, the first roller 5 and the second roller 51 are respectively arranged and loaded into the space formed by each inner arc surface 901. A first spring 6 is loaded between the first roller 5 and the second roller 51. Both ends of the first spring 6 respectively elastically abut against the circumferential walls of the first roller 5 and the second roller 51;

[0038] A spring mounting hole 902 is provided on the upper end surface of the roller seat 9. A second spring 8 is installed in the spring mounting hole 902, and a steel ball 7 is provided at the upper end of the second spring 8;

[0039] As Figure 4As shown, the main board 401 of the shift fork 4 is provided with a through hole 403, and three hypotenuses two 404 are evenly distributed on the outer circumference. Three shift fork rods 402 extending downward are evenly distributed on the lower end surface of the main board 401. The shift fork rods 402 of the shift fork 4 are stacked downward on the upper end surface of the roller seat 9, and the lower end surface of the main board 401 is elastically abutted against the steel ball 7. The shift fork rods 402 are located at the position between the adjacent first roller 5 and the second roller 51 in the roller mounting hole 903; As Figure 11 shown, three arc surfaces 301 are evenly distributed inside the adjusting ring cover 3. The three arc surfaces 301 are connected by three hypotenuses 302. The arc surfaces 301 and the hypotenuses 302 are correspondingly sleeved with the main board 401 and the hypotenuse two 404. With the above structural connection, when the adjusting ring cover 3 is rotated, the installed shift fork 4 can be driven to rotate synchronously, and the shift fork rod 402 can be used to move the first roller 5 or the second roller 51;

[0040] The roller seat 9 installed with the shift fork 4 is installed in the inner ring of the transmission gear outer cover 10, and the lower end surface abuts against the upper end surface of the transmission inner gear ring 11; As Figure 5 shown, the lower end of the transmission rod 203 of the ratchet lever 2 is a fixed end 207. After the first snap ring 1 is installed in the second snap ring groove 206, the ratchet lever 2 is passed through the middle hole of the adjusting ring cover 3. After being connected with the adjusting ring cover 3, the ratchet lever 2 passes downward through the shift fork 4, the roller seat 9, and the main body seat 14. The end of the connecting rod 202 of the ratchet lever 2 exposes the lower end surface of the main body seat 14. The second snap ring 15 is installed in the first snap ring groove 204. The fixed end 207 is located between the inner circumferences of the first roller 5 and the second roller 51 and the axial positions correspond. The external teeth 201 mesh with the three transmission gears 13 and can transmit power.

[0041] The specifications of the straight groove 1010 are consistent with the specifications of the straight teeth 1102, and they can mesh and transmit power after assembly.

[0042] The clearance between the positioning pin 12 and the positioning hole 1404 is not greater than 0.02 mm, which is beneficial to controlling the clearance error during transmission.

[0043] A hexagonal hole 205 is provided inside the upper end of the transmission rod 203, which is beneficial to installing the bit.

[0044] The number of teeth of the internal teeth 1101 of the transmission inner gear ring 11 is a multiple of the number of teeth of the transmission gear 13, such as 5:1, 4:1, 5:1, 3:1, 4.5:1......, which can be set according to actual needs.

[0045] The module of the internal teeth 1101 is the same as the module of the transmission gear 13.

[0046] Implementation case

[0047] After the overall assembly of this technical solution, the main body base 14 is connected to the handle of the hand tool, and the spline shaft 1402 is inserted and meshed with the internal spline of the handle. When the handle rotates to drive the connected main body base 14 to rotate, the three positioning pins 12 inside drive the respective connected speed change gears 13 to make a circular rotation with the axis of the main body base 14 as the baseline. The three speed change gears 13 drive the ratchet rod 2 to rotate synchronously in a transmission mode where the outer teeth 201 are meshed with the middle-mounted external teeth. When the handle is stationary and not rotating, pinch the ratchet rod 2 by hand and rotate it. The outer teeth 201 at the lower end of the ratchet rod 2 can drive the three speed change gears 13 to rotate synchronously with their respective connected positioning pins 12 as the base axes, but will not drive the main body base 14 to rotate.

[0048] When adopting a 1:1 multiple constant-speed transmission, rotating the handle can drive the main body base 14 to rotate synchronously. The teeth of the three speed change gears 13 inside and the outer teeth 201 of the ratchet rod 2 are always in a static meshing state. When the main body base 14 rotates, the three positioning pins 12 drive the speed change gears 13 to rotate as a whole. The speed change gears 13 in the static meshing state drive the ratchet rod 2 to rotate and tighten or loosen the screw. In this rotation state, it is a non-multiple constant-speed state. When the main body base 14 rotates, the internal speed change inner gear ring 11 meshed with the speed change gears 13 rotates synchronously. When the external handle rotates one circle, the ratchet rod 2 drives the installed bit to rotate one circle.

[0049] When adopting a multiple speed change transmission, assuming that the number of teeth of the internal teeth 1101 of the speed change inner gear ring 11 is 5:1 times the number of teeth of the speed change gear 13, when rotating the handle can drive the main body base 14 to rotate synchronously, use the other hand to pinch the speed change gear outer cover 10 to keep the speed change inner gear ring 11 stationary and not rotating. When the main body base 14 rotates, the speed change inner gear ring 11 is in a stationary state. The main body base 14 drives the three positioning pins 12 inside to drive the respective connected speed change gears 13 to make a circular rotation with the axis of the main body base 14 as the baseline. When the main body base 14 rotates one week, the gears of each speed change gear 13 rotate one circle around the meshing disc of the internal teeth 1101 of the speed change inner gear ring 11. When a single speed change gear 13 rotates to the original position angle after rotating one circle around the meshing disc of the internal teeth 1101 of the speed change inner gear ring 11, the single speed change gear 13 has rotated 5 circles. When the number of teeth of the speed change gear 13 is set to be the same as the number of teeth of the outer teeth 201, the speed change gear 13 that rotates 5 circles drives the ratchet rod 2 meshed with the outer teeth 201 to rotate at a multiple speed by 5 circles, and the ratchet rod 2 drives the installed bit to rotate 5 circles to achieve the rotation function of multiple speed changes.

[0050] When adjusting the position of the adjusting ring cover 3 to make the hand tool in a locked state on both the left and right, such as Figure 7As shown, the shift lever 402 is adjusted to be located at the middle position between the first roller 5 and the second roller 51 without contact. At this time, under the elastic force of the first spring 6, both the first roller 5 and the second roller 51 abut against the inner arc surface 901 and the fixed end 207 outward. The width at this position is less than a2 and greater than a1 and is equal to the diameters of the first roller 5 and the second roller 51. When the ratchet lever 2 rotates counterclockwise, the fixed end 207 drives the elastically contacting second roller 51 to roll leftward and move in the direction of a1. The circumferential wall of the second roller 51 radially presses the circumferential wall of the fixed end 207 and jams the fixed end 207, making the fixed end 207 unable to rotate, achieving counterclockwise locking; when the ratchet lever 2 rotates clockwise, the fixed end 207 drives the elastically contacting first roller 5 to roll rightward and move in the direction of a1. The circumferential wall of the first roller 5 radially presses the circumferential wall of the fixed end 207 and jams the fixed end 207, making the fixed end 207 unable to rotate, achieving clockwise locking;

[0051] When the hand tool is in the state of counterclockwise locking and clockwise movement, as Figure 8 shown, the shift lever 402 is adjusted to rotate leftward and push the first roller 5 to move leftward. At this time, under the elastic force of the first spring 6, the second roller 51 abuts against the inner arc surface 901 and the fixed end 207. The width of the position where the first roller 5 is located is greater than the diameter of the first roller 5 and has no contact with the fixed end 207. When the ratchet lever 2 rotates counterclockwise, the fixed end 207 drives the elastically contacting second roller 51 to roll leftward and move in the direction of a1. The circumferential wall of the second roller 51 radially presses the circumferential wall of the fixed end 207 and jams the fixed end 207, making the fixed end 207 unable to rotate, achieving counterclockwise locking; when the ratchet lever 2 rotates clockwise, the fixed end 207 can drive the second roller 51 to elastically retreat rightward and cannot lock the fixed end 207. The first roller 5 itself is in a state of not contacting the fixed end 207, enabling clockwise movement. In this state, it can lock the transmission and rotate the screw counterclockwise, and can return at an angle clockwise to facilitate entering the next counterclockwise transmission.

[0052] When the hand tool is in the state of clockwise locking and counterclockwise movement, as Figure 9 shown, the shift lever 402 is adjusted to rotate rightward and push the second roller 51 to move rightward. At this time, under the elastic force of the first spring 6, the first roller 5 abuts against the inner arc surface 901 and the fixed end 207. The width of the position where the second roller 51 is located is greater than the diameter of the second roller 51 and has no contact with the fixed end 207. When the ratchet lever 2 rotates clockwise, the fixed end 207 drives the elastically contacting first roller 5 to roll rightward and move in the direction of a1. The circumferential wall of the first roller 5 radially presses the circumferential wall of the fixed end 207 and jams the fixed end 207, making the fixed end 207 unable to rotate, achieving clockwise locking; when the ratchet lever 2 rotates counterclockwise, the fixed end 207 can drive the first roller 5 to elastically retreat leftward and cannot lock the fixed end 207. The second roller 51 itself is in a state of not contacting the fixed end 207, enabling counterclockwise movement. In this state, it can lock the transmission and rotate the screw clockwise, and can return at an angle counterclockwise to facilitate entering the next clockwise transmission.

[0053] The present invention is a ratchet assembly of a hand tool, which can have a multiple speed change function. While having three hand tool working modes of left-right rotation locking, left-hand rotation locking and right-hand rotation locking, it has a multiple speed change function to achieve the function of quickly screwing screws. When the rotating main body seat synchronously drives the ratchet rod to rotate, the hand holds the outside of the speed gear outer cover synchronously so that the speed gear inner gear ring does not rotate, and the speed gear and the speed gear outer cover produce multiple speed change rotations, and the corresponding multiples drive the ratchet rod to rotate at a different speed, thereby improving work efficiency.

[0054] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. Hand tool multiple speed change ratchet assembly, characterized in that: It includes a ratchet lever, an adjusting ring cover, a fork, roller one, roller two, spring one, a roller seat, a transmission gear outer cover, a transmission internal gear ring, a positioning pin, a transmission gear, and a main body seat. At the upper and lower ends of the step of the main body seat flange with a middle hole, there are respectively a seat body and a spline shaft. The outer circumference of the spline shaft is evenly distributed with straight-tooth splines. On the upper end face of the seat body, three spacer blocks are vertically and evenly distributed. Positioning holes are respectively arranged at the middle positions of the seat body between adjacent spacer blocks. One end of the positioning pin is inserted and installed in connection with the positioning hole, and the other end of the positioning pin extends upward from the end face of the seat body. The transmission gear is sleeved on the positioning pin, and the transmission gear after sleeving can rotate with the positioning pin as the base shaft. The transmission internal gear ring is installed on the main body seat. After installation, the three transmission gears are all synchronously meshed with the internal gear. The upper end face of the transmission gear is flush with the upper end face of the transmission internal gear ring. When the transmission internal gear ring rotates, it drives the three transmission gears to rotate synchronously. A number of straight teeth are evenly distributed on the outer circumference of the transmission internal gear ring. Straight grooves are evenly distributed on the inner ring of the transmission gear outer cover. The transmission gear outer cover is sleeved on the outside of the transmission internal gear ring, and the straight grooves are in an embedded meshing connection with the straight teeth. The roller seat is provided with a through hole one. At the upper end of the through hole one, there is a roller installation hole. The inner wall of the roller installation hole is formed by connecting three identical inner arc surfaces. The distance between the two ends of the inner arc surface from the through hole one is a1, and the distance between the middle position of the inner arc surface from the through hole one is a2. a1 gradually increases along the inner arc surface and transitions to the middle position a2, where a2 is the maximum value and a1 is the minimum value. Roller one and roller two are respectively installed in the space formed by each inner arc surface. Spring one is installed between roller one and roller two, and the two ends of spring one respectively elastically abut against the circumferential walls of roller one and roller two. On the upper end face of the roller seat, there is a spring installation hole. Spring two is installed in the spring installation hole, and a steel ball is provided at the upper end of spring two. The main board of the fork is provided with a through hole and three inclined edges two are evenly distributed on the outer circumference. On the lower end face of the main board, three fork rods extending downward are evenly distributed. The fork rods of the fork are stacked downward on the upper end face of the roller seat, and the lower end face of the main board elastically abuts against the steel ball. The fork rods are located at the position between adjacent roller one and roller two in the roller installation hole. The roller seat with the fork installed is installed in the inner ring of the transmission gear outer cover, and the lower end face abuts against the upper end face of the transmission internal gear ring. Three arc surfaces are evenly distributed inside the adjusting ring cover. The arc surfaces are connected by three inclined edges. The arc surfaces and the inclined edges are correspondingly sleeved with the main board and the inclined edges two. The lower end of the transmission rod of the ratchet lever is a fixed end. After the snap ring one is installed in the snap ring groove two, the ratchet lever is inserted into the middle hole of the adjusting ring cover. After being connected with the adjusting ring cover, the ratchet lever penetrates downward through the fork, the roller seat, and the main body seat. The end of the connecting rod of the ratchet lever exposes from the lower end face of the main body seat. The snap ring two is installed in the snap ring groove one. The fixed end is located between the circular holes formed by the inner circumferences of roller one and roller two and the axial positions correspond. The external teeth are meshed with the three transmission gears and can transmit power. The specifications of the straight grooves match the specifications of the straight teeth. The fitting clearance between the positioning pin and the positioning hole is not greater than 0.02 mm.

2. The hand tool multiple-speed ratchet assembly according to claim 1, wherein: A hexagonal hole is provided inside the upper end of the transmission rod.

3. The hand tool multiple-speed ratchet assembly according to claim 1, wherein: The number of internal teeth of the transmission internal gear ring is a multiple of the number of teeth of the transmission gear.

4. The hand tool multiple-speed ratchet assembly according to claim 3, wherein: The module of the internal teeth is the same as the module of the transmission gear.

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