A gear reducer and honing stone radial expansion and contraction mechanism

Abstract

The present invention discloses a gear reducer and a honing oilstone radial expansion and contraction mechanism, comprising a gear shaft assembly, a gear sleeve assembly, and an eccentric wheel; the gear shaft assembly comprises a gear shaft and a gear, the gear is fixedly connected to the right end of the gear shaft, and the gear shaft is connected to the honing head by being inserted into a honing head base; the gear sleeve assembly comprises an inner gear sleeve and an end cover, the inner gear sleeve is meshed with the gear, the difference in the number of teeth between the inner gear sleeve and the gear is not greater than 4, and the end cover is arranged tightly against the right end surface of the inner gear sleeve; the eccentric wheel comprises a positioning cylindrical surface, a third fixing hole, and a fourth fixing hole, the left end of the eccentric wheel is sleeved in the end cover through the positioning cylindrical surface, and is simultaneously sleeved on the gear shaft through the third fixing hole, the right end of the eccentric wheel is connected to the transmission rod through the fourth fixing hole, and an eccentric distance e is provided between the center line of the positioning cylindrical surface and the center lines of the third fixing hole and the fourth fixing hole.

Description

Technical Field

[0001] The invention relates to the technical field of grinding and honing, in particular to a gear reducer and a honing oilstone radial expansion and contraction mechanism. Background Art

[0002] In the prior art, the honing head used for honing holes in metal parts has a complex structure, especially the radial expansion and contraction mechanism of the honing oilstone is complex. Most of them adopt a cone structure, and the structure varies and has poor versatility, resulting in high manufacturing costs for the honing tools. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a gear reducer and a honing oilstone radial expansion and contraction mechanism to address the deficiencies of the existing technology. The gear reducer and the honing oilstone radial expansion and contraction mechanism can realize the deceleration of the honing oilstone radial expansion and contraction drive mechanism, and can realize the radial expansion and contraction and constant pressure of the oilstone honing bar, so that the radial expansion and contraction of the honing oilstone is more stable and the impact is smaller.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A gear reducer, the structural characteristics of which are that it includes a gear shaft assembly, a gear sleeve assembly, and an eccentric wheel;

[0006] The pinion assembly includes a pinion and a gear, wherein the gear is fixedly connected to the right end of the pinion, and the pinion is connected to the honing head by being installed in a honing head base;

[0007] The gear sleeve assembly includes an inner gear sleeve and an end cover. The inner gear sleeve is meshed with the gear. The difference in the number of teeth between the inner gear sleeve and the gear is no more than 4. The end cover is arranged closely against the right end surface of the inner gear sleeve.

[0008] The eccentric wheel includes a positioning cylindrical surface, a third fixing hole, and a fourth fixing hole. The left end of the eccentric wheel is sleeved in the end cover through the positioning cylindrical surface, and is simultaneously sleeved on the gear shaft through the third fixing hole. The right end of the eccentric wheel is connected to the transmission rod through the fourth fixing hole. There is an eccentric distance e between the center line of the positioning cylindrical surface and the center lines of the third fixing hole and the fourth fixing hole.

[0009] The gear reducer of the present invention utilizes an eccentric wheel and a small-tooth-difference planetary gear transmission structure. The small-tooth-difference planetary gear transmission structure utilizes an outer gear, i.e., the gear of the pinion assembly, as the center gear, and an inner gear, i.e., the sleeve assembly, as the planetary gears. The sleeve assembly directly transmits rotational motion to the pinion assembly via gears. Consequently, when the eccentric wheel rotates, the sleeve assembly is forced to undergo both circular translational motion around the axis of the pinion assembly and rotational motion around its own axis. After meshing the small-tooth-difference gears, the pinion assembly achieves reverse-reduced rotational motion. By integrating the gear reducer into a honing head and connecting it to the hydraulic adjustment mechanism of the honing machine, reverse reduction of the honing oilstone expansion and contraction drive mechanism is achieved, as well as smooth radial expansion and contraction of the honing oilstone while maintaining constant pressure. This results in a smoother radial expansion and contraction process with less impact.

[0010] According to the embodiments of the present invention, the present invention can be further optimized. The following is the technical solution formed after optimization:

[0011] It includes a positioning gear, which is a T-shaped sleeve structure with straight-face teeth at one end. The first fixing hole is provided on the side wall of the cylindrical end of the positioning gear. The positioning gear is sleeved on the gear shaft of the gear shaft assembly through the second fixing hole in the center of its sleeve structure.

[0012] Furthermore, the gear sleeve assembly also includes an outer gear sleeve, which is a circular ring structure. The inner gear sleeve and the end cover are respectively nested in the middle and right end of the outer gear sleeve. The left end of the outer gear sleeve is engaged with the straight tooth end of the positioning gear. The difference in the number of teeth between the outer gear sleeve and the positioning gear is not greater than 4.

[0013] Furthermore, the inner annular surface of the outer gear sleeve is preset with outer gear sleeve inner teeth, a first step surface, and a second step surface; the outer circular surface of the inner gear sleeve is preset with two symmetrical positioning teeth, and the inner annular surface is the inner teeth of the inner gear sleeve; the end cover is a disc with a center hole, and the left end of the end cover is provided with an end cover end face step hole;

[0014] The outer circumferential surface of the inner gear sleeve is transitionally fitted with the first step surface of the outer gear sleeve; and the end cover is interference fitted with the second step surface.

[0015] Furthermore, the gear shaft assembly also includes a positioning sleeve, which is a circular ring structure; the right end of the gear shaft is provided with a third step surface and a fourth step surface, the third step surface cuts off part of the tooth shape, the fourth step surface is a cylindrical surface, and the end of the cylindrical surface is provided with a threaded hole; the positioning sleeve and the gear are interference fit in sequence from left to right on the third step surface of the gear shaft.

[0016] Furthermore, the gear is provided with external gear teeth and internal gear teeth, the external gear teeth are a convex arc surface tooth structure, the internal gear teeth are a straight surface tooth structure, and a gear cone surface is provided at the left end of the gear.

[0017] Furthermore, it also includes a bushing, which is sleeved on the gear shaft through a bushing step hole at its left end, and a countersunk hole is also provided at the right end of the bushing.

[0018] Furthermore, a gasket is provided between the bushing and the gear shaft.

[0019] Based on the same inventive concept, the present invention also proposes a radial expansion and contraction mechanism for a honing oilstone.

[0020] A radial expansion and contraction mechanism for a honing oilstone, characterized in that it includes a gear reducer according to any one of claims 1 to 8, and also includes a honing head and a transmission rod, wherein the rack of the honing head is engaged with the gear shaft of the gear reducer, and the transmission rod is a universal connection structure, one end of the transmission rod is connected to the fourth fixing hole on the eccentric wheel of the gear reducer, and the other end is connected to the honing rod of the machine tool.

[0021] Furthermore, the transmission rod includes a transmission rod fixing hole and an expansion and contraction mechanism joint. A threaded fixing hole is provided on the honing head base. The expansion and contraction mechanism joint is inserted into the fourth fixing hole of the eccentric wheel, and the transmission rod fixing hole and the threaded fixing hole are penetrated by a step screw.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The gear reducer of this invention can be widely used in honing holes in metal parts and manufacturing honing tools. It is suitable for honing heads of various specifications with diameters exceeding 100 mm. Its high versatility significantly reduces the cost of honing tool manufacturing. It is also easy to operate and highly efficient, requiring only simple operator training to master.

[0024] 2) The radial expansion and contraction mechanism of the honing oilstone of the present invention ensures good contact and constant pressure between the honing oilstone and the part hole wall by utilizing a planetary gear reducer with a small tooth difference, realizes reverse deceleration of the honing oilstone expansion and contraction mechanism, and makes the radial expansion and contraction process of the honing oilstone smoother and with less impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present invention, but are not intended to limit the present invention.

[0026] Figure 1 It is a two-dimensional structural schematic diagram of an embodiment of the gear reducer of the present invention.

[0027] Figure 2 This is an exploded view of an embodiment of a gear reducer of the present invention.

[0028] Figure 3 FIG. 1 is a cross-sectional view of a gear shaft assembly according to an embodiment of the present invention.

[0029] Figure 4 FIG. 1 is a cross-sectional view of an embodiment of a gear shaft of a gear shaft assembly according to the present invention.

[0030] Figure 5 Schematic diagram of the structure of a gear of a gear shaft assembly according to an embodiment of the present invention.

[0031] Figure 6 Schematic diagram of the structure of a gear sleeve assembly according to an embodiment of the present invention.

[0032] Figure 7 It is a cross-sectional view of an embodiment of a gear sleeve assembly of the present invention.

[0033] Figure 8 It is a structural schematic diagram of an embodiment of an outer gear sleeve of a gear sleeve assembly of the present invention.

[0034] Figure 9 It is a structural schematic diagram of an embodiment of an inner gear sleeve of a gear sleeve assembly of the present invention.

[0035] Figure 10 It is a structural schematic diagram of an embodiment of the end cover of the gear sleeve assembly of the present invention.

[0036] Figure 11 Schematic diagram of the structure of a positioning gear according to an embodiment of the present invention.

[0037] Figure 12 Schematic diagram of the structure of an eccentric wheel according to an embodiment of the present invention.

[0038] Figure 13 Schematic diagram of the structure of an eccentric wheel according to an embodiment of the present invention.

[0039] Figure 14 Schematic diagram of the structure of a bushing according to an embodiment of the present invention.

[0040] Figure 15 Schematic diagram of the connection structure of a radial expansion and contraction mechanism of a honing oilstone according to an embodiment of the present invention.

[0041] Figure 16 It is a schematic diagram of the overall structure of an embodiment of the radial expansion and contraction mechanism of the honing oilstone of the present invention.

[0042] Reference numerals:

[0043] 1- gear shaft assembly; 2- gear sleeve assembly; 3- positioning gear; 4- eccentric wheel; 5- gasket; 6- bushing; 7- countersunk screw; 8- honing head; 9- transmission rod; 10- step screw; 000- planetary gear movement clearance;

[0044] 11- gear shaft; 12- positioning sleeve; 13- gear; 14- elastic cylindrical pin;

[0045] 21-external gear sleeve; 22-internal gear sleeve; 23-end cover;

[0046] 111-third step surface; 112-fourth step surface; 113-threaded hole;

[0047] 131- gear outer teeth; 132- gear inner teeth; 133- gear cone surface;

[0048] 211-external gear sleeve internal gear; 212-first step surface; 213-second step surface;

[0049] 221- positioning tooth; 222- internal tooth of internal gear sleeve;

[0050] 231-step hole on the end face of the end cover;

[0051] 301-first fixing hole; 302-second fixing hole; 303-inner tapered hole of positioning gear;

[0052] 401-positioning cylindrical surface; 402-third fixing hole; 403-eccentric wheel step surface; 404-fourth fixing hole; 405-eccentric wheel driving groove;

[0053] 601-bushing step hole; 602-countersunk hole;

[0054] 801-threaded fixing hole; 802-fifth fixing hole; 803-sixth fixing hole; 804-rack;

[0055] 901- Transmission rod fixing hole; 902- Expansion and contraction mechanism joint. DETAILED DESCRIPTION

[0056] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings of the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. It should be noted that the "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0057] At least one embodiment of the present invention provides a gear reducer, such as Figure 1 、 Figure 2 As shown, it includes a gear shaft assembly 1, a gear sleeve assembly 2, a positioning gear 3, an eccentric wheel 4, a washer 5, a bushing 6, and a countersunk screw 7. The positioning gear 3, the gear sleeve assembly 2, the eccentric wheel 4, the washer 5, and the bushing 6 are sequentially installed from left to right on the right end of the gear shaft 11 of the gear shaft assembly 1, and the positioning gear 3 and the gear 13 of the gear shaft assembly 1 are all engaged with the gear sleeve assembly 2.

[0058] Combine Figure 3 、 Figure 4 、 Figure 5 The gear shaft assembly 1 includes a gear shaft 11, a positioning sleeve 12, and a gear 13. The gear shaft 11 is a small-diameter, long gear shaft structure, preferably having an involute tooth cross-section with a module m = 1, a pressure angle = 20, and a number of teeth = 10. One end of the gear shaft 11 is provided with a third step surface 111 and a fourth step surface 112, wherein the third step surface 111 cuts off part of the tooth profile, and the fourth step surface 112 is a cylindrical surface with a threaded hole 113 at the end of the cylindrical surface. The positioning sleeve 12 is a long circular ring structure, and the gear 13 is provided with external gear teeth 131 and internal gear teeth 132. The external gear teeth are preferably a convex arc surface tooth structure, and the internal gear teeth are preferably a straight surface tooth structure. This can prevent the gear 13 from meshing and getting stuck. A gear cone surface 133 is provided at one end of the gear 13 to increase the gear strength. The positioning sleeve 12 and the gear 13 are sequentially interference-fitted on the third step surface 111 of the gear shaft 11 . The third step surface 111 with a partial tooth shape further limits the mutual rotation between the gear 13 and the gear shaft 11 .

[0059] Combine Figure 6 、 Figure 7 The gear sleeve assembly 2 includes an outer gear sleeve 21, an inner gear sleeve 22, and an end cover 23.

[0060] Combine Figure 8 The outer gear sleeve 21 is a circular ring structure, and its inner ring surface is preset with outer gear sleeve inner teeth 211, a first step surface 212, and a second step surface 213. The first step surface 212 has a truncated portion of the tooth shape, and the second step surface 213 is a cylindrical hole. The outer gear sleeve inner teeth 211 are preferably arc inner teeth.

[0061] Combine Figure 9 The outer circular surface of the inner gear sleeve 22 is preset with two symmetrical positioning teeth 221, and the inner annular surface of the inner gear sleeve 22 is the inner gear sleeve inner teeth 222, and the inner gear sleeve inner teeth 222 are preferably straight-faced inner teeth.

[0062] Combine Figure 10 The end cover 23 is a disc with a hole, and a step hole 231 is provided on the end face of the end cover at one end.

[0063] The inner gear sleeve 22 is mounted on the first step surface 212 of the outer gear sleeve 21, with the positioning teeth 221 inserted into any two symmetrical tooth grooves on the first step surface 212 of the outer gear sleeve 21 to limit relative circumferential rotation between the two. The outer circumferential surface of the inner gear sleeve 22 forms a transition fit with the first step surface 212 of the outer gear sleeve 21. The end face of the inner gear sleeve 22 is in close contact with the end face of the first step surface 212. The side of the end cover 23 with the stepped hole 231 is in close contact with the inner gear sleeve 22 and is mounted on the second step surface 213 of the outer gear sleeve 21. The end cover 23 and the second step surface 213 of the outer gear sleeve 21 form an interference fit. Thus, the outer gear sleeve 21, the inner gear sleeve 22, and the end cover 23 are sheathed together to form the gear sleeve assembly 2.

[0064] Combine Figure 11 The positioning gear 3 is a T-shaped sleeve structure with straight teeth on one end. It is mounted closely to the gear 13. The positioning gear 3 is fitted over the addendum circle of the pinion 11 of the pinion assembly 1 through its second fixing hole 302, with some clearance for rotation. The positioning gear 3 has an inner tapered hole 303 on its toothed end to clear the conical surface 133 of the gear 13. Two symmetrical first fixing holes 301 are provided on the sidewall of its cylindrical end for connection and fixation with the honing head 8.

[0065] The gear sleeve assembly 2 is mounted on the gear shaft assembly 1 with its end cover 23 facing the gear 13. The outer gear sleeve 21 meshes with the positioning gear 3. The difference in the number of teeth between the outer gear sleeve 21 and the positioning gear 3 is not greater than 4. The specific value of the difference in the number of teeth is matched according to the diameter of the parts. The inner gear sleeve 22 meshes with the gear 13. The difference in the number of teeth between the inner gear sleeve 22 and the gear 13 is not greater than 4. Both are meshing with a small tooth difference. Both form a planetary gear motion gap of 000 (see Figure 1 ), the end surface of the end cover end surface step hole 231 at the left end of the end cover 23 can reduce the rotational friction between it and the gear 13.

[0066] Combine Figure 12 、 13 The eccentric wheel 4 is mounted in the end cover end face step hole 231 of the end cover 23 through the positioning cylindrical surface 401, and is simultaneously mounted on the fourth step surface 112 of the gear shaft 11 through the third fixing hole 402. Both are clearance fits and can rotate freely relative to each other. Since the center line of the positioning cylindrical surface 401 of the eccentric wheel 4 and the center lines of the third fixing hole 402 and the fourth fixing hole 404 are preset with an eccentric distance e (see Figure 12 ) When the eccentric wheel 4 rotates, it forces the gear sleeve assembly 2 to perform both circular translation around the axis of the pinion assembly 1 and rotational motion around its own axis. After meshing and driving the gears with a small tooth difference, the pinion assembly 1 achieves reverse, decelerated rotational motion. The eccentric wheel step 403 of the eccentric wheel 4 reduces friction, while the positioning gear 3 only provides positioning support and does not contribute to transmission. The eccentric distance e is equal to the center distance between the meshing gear 13 of the pinion assembly 1 and the internal gear sleeve 22 of the gear sleeve assembly 2.

[0067] Combine Figure 14 The bushing 6 is fitted onto the second step surface 112 of the gear shaft 11 together with the washer 5 through the bushing step hole 601 and is located in the fourth fixing hole 404 of the eccentric 4. The bushing 6 is tightly connected to the threaded hole 113 of the gear shaft 11 through the countersunk hole 602 of the bushing 6 using the countersunk screw 7, thus completely connecting the gear reducer. The axial movement clearance is ensured by grinding the thickness of the washer 5.

[0068] The operating principle of the gear reducer of the present invention is as follows: by providing an eccentric wheel 4 and a small-tooth-difference planetary gear transmission structure, wherein the small-tooth-difference planetary gear transmission structure uses the outer gear, i.e., gear 13 of the pinion assembly 1, as the center gear, and the inner gear, i.e., the gear sleeve assembly 2, as the planetary gear. The gear sleeve assembly 2 directly transmits the rotational motion to the output of the pinion assembly 1 via gear 13. As a result, when the eccentric wheel 4 rotates, the gear sleeve assembly 2 is forced to perform both circular translational motion around the axis of the pinion assembly 1 and rotational motion around its own axis. After the small-tooth-difference gears engage and transmit the rotational motion, the pinion assembly 1 obtains a reverse-reduced rotational motion.

[0069] Based on the same inventive concept, the present invention also proposes a honing oilstone radial expansion and contraction mechanism, such as Figure 15 、 16 shown.

[0070] The honing head 8 is a rack expansion and contraction oilstone honing head compatible with the present invention. The rack 804 of the honing head 8 meshes with the gear reducer's gear shaft 11. The transmission rod 9 adopts a universal joint structure. One end of the transmission rod 9 connects the honing head 8 and the gear reducer, and the other end connects to the machine tool honing rod.

[0071] The left end of the gear reducer's gear shaft is inserted into the sixth fixing hole 803 of the base of the honing head 8, and is penetrated by an elastic cylindrical pin 14 through the first fixing hole 301 preset on the positioning gear 3 and the fifth fixing hole 802 of the base of the honing head 8, thereby connecting the gear reducer to the honing head 8.

[0072] The step screw 10 is passed through the transmission rod fixing hole 901 and the threaded fixing hole 801 of the base of the honing head 8, and the expansion and contraction mechanism joint 902 passed through the transmission rod 9 is inserted into the fourth fixing hole 404 of the eccentric wheel 4 and the eccentric wheel driving groove 405, thereby completing the connection between the transmission rod 9 and the honing head 8 and the gear reducer.

[0073] The working principle of the radial expansion and contraction mechanism of the honing oilstone of the present invention is as follows: the rotation and axial reciprocating motion of the honing head 8 are realized by the honing machine tool via the honing rod and the transmission rod 9, and the radial expansion and contraction of the honing oilstone is transmitted by the driving rod in the honing rod to the expansion and contraction adjustment structure in the transmission rod 9, and drives the eccentric wheel 4 of the gear reducer through the expansion and contraction structure joint 902, and then is transmitted to the oilstone rack 804 of the honing head 8 through the gear reducer of the present invention, thereby realizing the radial linear expansion and contraction of the honing oilstone.

[0074] The installation process of the present invention:

[0075] See also Figure 15 When in use, the gear reducer of the present invention must first be installed into the sixth fixing hole 803 of the base of the honing head 8. It is then secured to the base of the honing head 8 by an elastic cylindrical pin 14 through the first fixing hole 301 of the positioning gear 3 and the fifth fixing hole 802 of the honing head 8. The transmission rod 9 is connected to the base of the honing head 8 by a stepped screw 10 through the transmission rod fixing hole 901 and the threaded fixing hole 801 of the honing head 8. The expansion and contraction mechanism joint 902, which extends through the hollow rod of the transmission rod 9, is inserted into the fourth fixing hole 404 and the eccentric drive slot 405 of the eccentric 4. The other end of the transmission rod 9 is connected to the machine tool honing rod.

[0076] The working process of the present invention:

[0077] See also Figure 15 、 Figure 16 When the honing oilstone is radially expanded and contracted in the present invention, the honing head 8 should be located in the honing hole of the part. The automatic expansion and contraction system of the machine tool drives the expansion and contraction mechanism joint 902 in the hollow rod of the transmission rod 9 through the honing rod to rotate clockwise or counterclockwise along the axis of the honing head 8. Then, the expansion and contraction mechanism joint 902 drives the gear sleeve assembly 2 of the gear reducer of the present invention through the eccentric wheel 4 to perform forward or reverse planetary rotation along the axis of the honing head 8.

[0078] When the gear sleeve assembly 2 performs forward planetary rotation, the gear shaft assembly 1 rotates in the reverse direction at a reduced speed and drives the rack 804 to retract radially; when the gear sleeve assembly 2 performs reverse planetary rotation, the gear shaft assembly 1 rotates in the forward direction at a reduced speed and drives the rack 804 to expand radially. The expansion and contraction system of the machine tool is automatically adjusted by the hydraulic system, ensuring good contact and constant pressure between the honing oilstone and the part hole wall.

[0079] The small-tooth-difference planetary gear transmission of the present invention and conventional small-tooth-difference planetary gear transmissions are both internal gear transmissions. The difference is that conventional small-tooth-difference planetary gear transmissions use an internal gear as the center gear and external gears as the planetary gears, requiring an output mechanism to transmit the rotational motion of the planetary gears to a low-speed output shaft. In contrast, the small-tooth-difference planetary gear transmission of the present invention uses an external gear, i.e., gear 13, as the center gear and an internal gear, i.e., gear sleeve assembly 2, as the planetary gears. The planetary gear sleeve assembly 2 directly transmits the rotational motion to the output of the gear shaft assembly 1 via gear 13.

[0080] The gear reducer of the present invention expands the application scope of the small tooth difference planetary gear transmission principle, is applied to the design and manufacture of honing tools, realizes the reverse deceleration of the honing oilstone expansion and contraction mechanism, and makes the radial expansion and contraction process of the honing oilstone smoother and with less impact.

[0081] The contents illustrated in the above embodiments should be understood as these embodiments are only used to more clearly illustrate the present invention, and are not used to limit the scope of the present invention. After reading the present invention, various equivalent modifications of the present invention by those skilled in the art shall fall within the scope defined by the claims attached to this application.

Claims

1. A gear reducer, characterized in that: It includes a gear shaft assembly (1), a gear sleeve assembly (2), a positioning gear (3), and an eccentric wheel (4); The gear shaft assembly (1) comprises a gear shaft (11) and a gear (13), wherein the gear (13) is fixedly connected to the right end of the gear shaft (11), and the gear shaft (11) is connected to the honing head (8) by being installed in the base of the honing head (8), and the gear (13) is provided with gear outer teeth (131) and gear inner teeth (132); The gear sleeve assembly (2) comprises an outer gear sleeve (21), an inner gear sleeve (22), and an end cover (23); the inner gear sleeve (22) is meshed with the gear (13); the difference in the number of teeth between the inner gear sleeve (22) and the gear (13) is not greater than 4; and the end cover (23) is arranged in close contact with the right end surface of the inner gear sleeve (22); The outer gear sleeve (21) is a circular ring structure, and the inner gear sleeve (22) and the end cover (23) are respectively nested in the middle and the right end of the outer gear sleeve (21); The inner annular surface of the outer gear sleeve (21) is preset with outer gear sleeve inner teeth (211), a first step surface (212), and a second step surface (213); the outer circumferential surface of the inner gear sleeve (22) is preset with two symmetrical positioning teeth (221), and the inner annular surface is the inner gear sleeve inner teeth (222); the end cover (23) is a disc with a center hole, and the left end of the end cover (23) is provided with an end cover end face step hole (231); The outer cylindrical surface of the inner gear sleeve (22) is transitionally fitted with the first step surface (212) of the outer gear sleeve (21); the end cover (23) is interference fitted with the second step surface (213); The positioning gear (3) is a T-shaped sleeve structure with straight teeth at one end, a first fixing hole (301) is provided on the side wall of the cylindrical end of the positioning gear (3), and the positioning gear (3) is sleeved on the gear shaft (11) of the gear shaft assembly (1) through a second fixing hole (302) at the center of the sleeve structure; The left end of the outer gear sleeve (21) is meshed with the straight tooth end of the positioning gear (3), and the difference in the number of teeth between the outer gear sleeve (21) and the positioning gear (3) is not greater than 4; The eccentric wheel (4) comprises a positioning cylindrical surface (401), a third fixing hole (402), and a fourth fixing hole (404). The left end of the eccentric wheel (4) is sleeved in the end cover (23) through the positioning cylindrical surface (401), and is sleeved on the gear shaft (11) through the third fixing hole (402). The right end of the eccentric wheel (4) is connected to the transmission rod (9) through the fourth fixing hole (404). An eccentric distance e is provided between the center line of the positioning cylindrical surface (401) and the center lines of the third fixing hole (402) and the fourth fixing hole (404).

2. The gear reducer according to claim 1, characterized in that The gear shaft assembly (1) further includes a positioning sleeve (12), which is a circular ring structure; a third step surface (111) and a fourth step surface (112) are provided at the right end of the gear shaft (11); the third step surface (111) has a portion of the tooth profile cut off; the fourth step surface (112) is a cylindrical surface, and a threaded hole (113) is provided at the end of the cylindrical surface; the positioning sleeve (12) and the gear (13) are interference-fitted and sleeved on the third step surface (111) of the gear shaft (11) in sequence from left to right.

3. The gear reducer according to claim 1, characterized in that The outer gear teeth (131) are convex arc surface tooth structures, the inner gear teeth (132) are straight surface tooth structures, and a gear cone surface (133) is provided at the left end of the gear (13).

4. The gear reducer according to claim 1, characterized in that It also includes a bushing (6), which is sleeved on the gear shaft (11) through a bushing step hole (601) at its left end, and a countersunk hole (602) is provided at the right end of the bushing (6).

5. The gear reducer according to claim 4, characterized in that: A gasket (5) is also provided between the bushing (6) and the gear shaft (11).

6. A radial expansion and contraction mechanism for a honing oilstone, characterized in that: The invention comprises a gear reducer according to any one of claims 1 to 5, and further comprises a honing head (8) and a transmission rod (9), wherein the rack (804) of the honing head (8) is engaged with the gear shaft (11) of the gear reducer, and the transmission rod (9) is a universal connection structure, wherein one end of the transmission rod (9) is connected to the fourth fixing hole (404) on the eccentric wheel (4) of the gear reducer, and the other end is connected to the honing rod of the machine tool.

7. The honing stone radial expansion and contraction mechanism according to claim 6, characterized in that: The transmission rod (9) includes a transmission rod fixing hole (901) and an expansion and contraction mechanism joint (902); a threaded fixing hole (801) is provided on a base of the honing head (8); the expansion and contraction mechanism joint (902) is inserted into a fourth fixing hole (404) of the eccentric wheel (4); and the transmission rod fixing hole (901) and the threaded fixing hole (801) are penetrated by a step screw (10).

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