Single-planet reduction gear with sun gear hollow type

Abstract

The utility model relates to a kind of hollow type single-planet reducer with sun gear, including base;Gear ring assembly, with base fixed connection;Output part, including outer ring and inner ring, outer ring is fixedly connected with gear ring assembly;Base and gear ring assembly and output part are sequentially connected to form box body enclosed;Center shaft assembly, along the input port to the output port rotation of box body is set in box body;Center shaft assembly includes center shaft and sun gear fixedly installed on center shaft;Planet part, including planet carrier and double gear rotatably mounted on planet carrier;Planet carrier rotation sleeve is set to center shaft assembly outside;Double gear simultaneously engages and connects sun gear and gear ring assembly. Through the base, output part and fixed gear ring integrated structure reduce overall structure size, through hollow sun gear structure combines hollow planet carrier architecture facilitates wiring, improve structure integration degree, and carry out power split, realize small size, high speed, high life operation.

Description

Technical Field

[0001] This utility model relates to the field of speed reducer technology, and in particular to a hollow single planetary speed reducer with a sun gear. Background Technology

[0002] Hollow-type single planetary gear reducers with a sun gear are widely used industrial products suitable for various mechanical equipment, including aerospace, wind power, and robotics. They are primarily used in humanoid robots, medical robots, and industrial robots. The design concept of the hollow-type single planetary gear reducer is based on a hollow reducer structure, achieving the maximum speed ratio, output torque, and transmission accuracy with the fewest parts and the shortest transmission chain. It is economical and convenient to manufacture, and its structural design is scientifically sound and reasonable.

[0003] However, the hollow planetary reducer currently available has a small internal space due to its hollow structure, resulting in a low speed ratio, a small torque increase, and a long transmission chain that is prone to accumulating errors.

[0004] Therefore, how to achieve large speed-changing torque and reduce transmission error within a limited space has become an urgent problem to be solved. Summary of the Invention

[0005] The purpose of this invention is to provide a hollow single planetary reducer with a sun gear, which aims to solve the problems of traditional reducers such as large size, low speed ratio, small torque increase, and large error.

[0006] To solve the above-mentioned technical problems, this utility model provides a hollow single planetary reducer with a sun gear, comprising: a base, which is an annular structure; a gear ring assembly, which is fixedly connected to the base along the axial direction; an output part, which includes an outer ring and an inner ring that rotate relative to each other, the outer ring being fixedly connected to the gear ring assembly along the axial direction; the base, the gear ring assembly, and the output part are sequentially connected to form a housing; the housing includes an axially connected input port and an output port; a central shaft assembly, which rotatably passes through the housing from the input port to the output port; the central shaft assembly includes a central shaft and a sun gear fixedly installed on the central shaft; a planetary part, which includes a planet carrier and a double gear rotatably installed on the planet carrier; the planet carrier is rotatably sleeved outside the central shaft assembly; the double gear simultaneously meshes with and connects the sun gear and the gear ring assembly.

[0007] Furthermore, the gear ring assembly includes: a fixed gear ring, which is fixedly connected to the machine base along the axial direction; and a movable gear ring, which is disposed in the housing, adjacent to the fixed gear ring and fixedly connected to the inner ring.

[0008] Furthermore, the planetary carrier is hollow; the central shaft is hollow, with the central shaft passing through the planetary carrier and its two ends mounted to the base and inner ring via bearings.

[0009] Furthermore, the double gear includes: a first gear and a second gear arranged side by side along the axial direction, the first gear meshing externally with the sun gear and internally with the corresponding fixed gear ring, and the second gear meshing internally with the corresponding moving gear ring.

[0010] Furthermore, the inner edge of the fixed gear ring is provided with a clearance groove corresponding to the second gear, and one end of the movable gear ring is installed in the clearance groove to mesh with the second gear.

[0011] Furthermore, a groove is provided between the first gear and the second gear, and the first gear and the second gear have different numbers of teeth.

[0012] Furthermore, the output section includes a crossed roller bearing, wherein the crossed roller bearing includes an outer ring, an inner ring, and rollers, the outer ring is fixedly connected to the fixed gear ring, and the inner ring is fixedly connected to the moving gear ring.

[0013] Furthermore, the base, the fixed gear ring, and the outer ring are provided with multiple sets of corresponding and connected bolt holes, so as to connect the three together by long bolts.

[0014] Furthermore, the hollow sun gear type single planetary reducer also includes: a cylindrical pin, fixedly mounted on the planet carrier; a double gear set outside the cylindrical pin; and a needle roller, installed between the cylindrical pin and the double gear.

[0015] Furthermore, multiple positioning surfaces are provided on the inner wall of the base, the inner wall of the outer ring, and the inner wall of the inner ring; the planetary carrier, the fixed gear ring, the moving gear ring, and the central shaft are all positioned based on the corresponding positioning surfaces to determine their relative positions.

[0016] Furthermore, an oil seal mounting groove is provided between the inner and outer rings, and the output section also includes an oil seal, which is installed in the oil seal mounting groove.

[0017] Implementing the embodiments of this utility model will have the following beneficial effects: 1. By integrating the base, fixed gear ring, and output section into a single housing, and utilizing a hollow sun gear and hollow planetary carrier, wiring is facilitated, integration is improved, overall size is reduced, transmission chain is shortened, transmission error is reduced, and overall structural lifespan is extended.

[0018] 2. By utilizing the sun gear to share the motor input speed and perform power shunting, it can handle a larger motor input speed and can be applied to high-speed motor input scenarios. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a cross-sectional structural schematic diagram of a hollow single planetary reducer with a sun gear provided in an embodiment of the present disclosure.

[0021] Figure 2 This is a schematic diagram of the end face structure of a hollow single planetary reducer with a sun gear in the input direction, provided as an embodiment of the present disclosure.

[0022] Figure 3 This is a schematic diagram of the end face structure of a hollow single planetary reducer with a sun gear according to an embodiment of the present disclosure.

[0023] Figure 4 This is a schematic diagram of a first gear meshing structure provided in an embodiment of the present disclosure.

[0024] Figure 5 This is a schematic diagram of a second gear meshing structure provided in an embodiment of the present disclosure.

[0025] Figure 6 This is a schematic diagram of the overall structure of a hollow single planetary gear reducer with a sun gear, provided as an embodiment of the present disclosure.

[0026] Figure 7 This is a schematic diagram of the overall structure of a hollow single planetary gear reducer with a sun gear, provided as an embodiment of the present disclosure.

[0027] Figure label: 100. Hollow single planetary reducer with sun gear; 110. Frame; 120. Gear ring assembly; 121. Fixed gear ring; 1211. Clearance groove; 122. Moving gear ring; 130. Output section; 131. Outer ring; 132. Inner ring; 133. Crossed roller bearing; 134. Bearing one; 135. Bearing two; 136. Oil seal; 140. Central shaft assembly; 141. Central shaft; 142. Sun gear; 150. Planetary section; 151. Planetary carrier; 152. Double gear; 1521. First gear; 1522. Second gear; 160. Housing; 161. Input port; 162. Output port; 170. Groove; 180. Bolt hole; 190. Cylindrical pin; 200. Needle roller; 210. Positioning surface; 220. Bearing three; 230. Bearing four. Detailed Implementation

[0028] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of this utility model are shown in the drawings. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0029] It should be noted that when a component is said to be "fixed to" another component, it can be directly attached to the other component or there may be an intervening component. When a component is said to be "connected to" another component, it can be directly connected to the other component or there may be an intervening component. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0031] Hollow planetary gear reducers with a sun gear are widely used industrial products suitable for various mechanical equipment, including aerospace, wind power, and robotics, primarily used in humanoid robots, medical robots, and industrial robots. The design concept of hollow planetary gear reducers is based on a hollow reducer structure, achieving the maximum speed ratio, output torque, and transmission accuracy with the fewest parts and the shortest transmission chain. Manufacturing is economical and convenient, and the structural design is scientifically sound. However, current hollow planetary gear reducers suffer from limited internal space due to their hollow structure, resulting in a lower speed ratio, smaller torque increase, and a longer transmission chain that is prone to error accumulation. Therefore, how to achieve large speed and torque increases while reducing transmission errors within a limited space has become a pressing problem to be solved.

[0032] This embodiment integrates the base, fixed gear ring, and output section into a single housing. Furthermore, the use of a hollow sun gear and a hollow planetary carrier facilitates wiring, increases integration, reduces overall size, shortens the transmission chain, reduces transmission errors, and extends the overall structural lifespan.

[0033] Combination Figures 1 to 7As shown, this disclosure provides a hollow single planetary reducer 100 with a sun gear, including a base 110, a gear ring assembly 120, an output section 130, a central shaft assembly 140, and a planetary section 150. The base 110 and the gear ring assembly 120 are both annular structures, and the gear ring assembly 120 is fixedly connected to the base 110 axially. The output section 130 is also annular, including an outer ring 131 and an inner ring 132 that rotate relative to each other. The outer ring 131 is fixedly connected to the gear ring assembly 120 axially. The base 110, the gear ring assembly 120, and the output section 130 are sequentially connected axially to form a housing 160. The housing 160 includes an axially connected input port 161 and an output port 162. The central shaft assembly 140 rotatably passes through the housing 160 in the direction from the input port 161 to the output port 162. The central shaft assembly 140 is rotatable relative to the housing 160 along its axis. The central shaft assembly 140 includes a central shaft 141 and a sun gear 142 fixedly mounted on the central shaft 141. The sun gear 142 is integrally formed with the central shaft 141, or it can be separately formed and fixedly connected, with the connection method including interference fit or fastener connection. The planetary section 150 includes a planet carrier 151 and a double gear 152 rotatably mounted on the planet carrier 151. The planet carrier 151 is rotatably sleeved outside the central shaft assembly 140. The double gear 152 corresponds to both the sun gear 142 and the ring gear assembly 120. The rotation of the sun gear 142 drives the ring gear assembly 120 to rotate via the double gear 152. The ring gear assembly 120 is connected to the output section 130, driving the output section 130 to rotate and output power.

[0034] Combination Figure 1 , Figure 4 and Figure 5 As shown, the gear ring assembly 120 includes a fixed gear ring 121 and a movable gear ring 122. One end of the fixed gear ring 121 is fixedly connected to the base 110 along the axial direction, and the other end is connected to the output section 130. The movable gear ring 122 is disposed inside the housing 160, adjacent to the fixed gear ring 121 and fixedly connected to the inner ring 132. The movable gear ring 122 has a screw through hole corresponding to the inner ring 132, and the inner ring 132 has a screw hole corresponding to the screw through hole of the movable gear ring 122. The movable gear ring 122 and the inner ring 132 are fixedly connected by screws. The gear of the moving gear ring 122 is adjacent to the gear of the fixed gear ring 121 to form a double gear ring, which meshes with the double gear 152. The double gear 152 meshes with both the fixed gear ring 121 and the sun gear 142. The sun gear 142 drives the double gear 152 to rotate. The double gear 152 is segmented. One segment meshes with the fixed gear ring 121, which remains stationary. Therefore, the rotation of the sun gear 142 drives the double gear 152 to rotate around the axis of the sun gear 142. The other segment of the double gear 152 drives the moving gear ring 122 to rotate. The moving gear ring 122 is fixedly connected to the inner ring 132 of the output section 130, driving the inner ring 132 to rotate for output.

[0035] Combination Figure 1 As shown, the planetary carrier 151 is axially hollow, and the central shaft 141 is also axially hollow, passing through the planetary carrier 151 with its axis coinciding with the axis of the planetary carrier 151. The sun gear 142 meshes with the double gear 152, and the rotation of the sun gear 142 drives the planetary carrier 151 to rotate. The two ends of the central shaft 141 are rotatably mounted on the base 110 and the inner ring 132 via bearings 220 and 135, respectively. Limiting platforms are provided at the bearing positions of the central shaft 141 corresponding to the base 110 and the inner ring 132. The limiting platforms include mutually perpendicular positioning surfaces 210. The base 110 restricts the bearing from moving axially toward the input port 161, and the inner ring 132 restricts the bearing from moving axially toward the output port 162. The base 110 and the inner ring 132 work together to determine the axial position of the central shaft 141 relative to the housing 160 and restrict the axial movement of the central shaft 141.

[0036] In some embodiments, the combination of the hollow structure of the planetary carrier 151 and the hollow structure of the central shaft 141 includes: the central shaft 141 has a connecting hole in the inner wall of its hollow structure, the connecting hole connecting the hollow space of the central shaft 141 and the hollow space of the planetary carrier 151, so that the wires can be routed in different spaces, avoiding multiple wires from gathering and getting tangled or mixed, and improving the safety of the wiring.

[0037] In some embodiments, the combination of the hollow structure of the planetary carrier 151 and the hollow structure of the central shaft 141 further includes: providing multiple wire harness fixing grooves along the axial direction on the hollow inner wall of the central shaft 141 for individual wire routing, wherein some of the wire harness fixing grooves have connecting holes in their groove walls that connect to the hollow internal space of the planetary carrier 151.

[0038] Combination Figure 1 As shown, the double gear 152 includes a first gear 1521 and a second gear 1522 arranged side by side along the axial direction. The first gear 1521 and the second gear 1522 are integrally formed and divided into two sections. The first gear 1521 meshes externally with the sun gear 142 and internally with the fixed gear ring 121. When the sun gear 142 rotates, the sun gear 142 drives the first gear 1521 to rotate around the sun gear 142 while the fixed gear ring 121 remains stationary. The first gear 1521 and the second gear 1522 are integrally formed, driving the second gear 1522 to rotate. The second gear 1522 meshes internally with the moving gear ring 122. The moving gear ring 122 is fixedly connected to the inner ring 132 of the output section 130, thereby driving the inner ring 132 to rotate and output.

[0039] Combination Figure 1As shown, the inner edge of the fixed gear ring 121 is provided with a clearance groove 1211 corresponding to the second gear 1522. One end of the movable gear ring 122 is installed in the clearance groove 1211 to mesh with the second gear 1522. The first gear 1521 and the second gear 1522 have the same module but different number of teeth, so that the pitch circle diameters of the first gear 1521 and the second gear 1522 are different. In order to ensure that the second gear 1522 can mesh with the movable gear ring 122 at the same time as the first gear 1521 meshes with the fixed gear ring 121, the inner edge of the fixed gear ring 121 is provided with a clearance groove 1211 corresponding to the second gear 1522, and the part of the movable gear ring 122 with internal teeth is installed in the clearance groove 1211. By changing the depth of the clearance groove 1211 and the structural dimensions of the moving gear ring 122, the part of the moving gear ring 122 that drives the internal teeth is always matched with the clearance groove 1211, so as to control the center distance between the double gear 152 and the moving gear ring 122 and adapt to different speed ratios.

[0040] Combination Figure 1 As shown, a groove 170 is provided between the first gear 1521 and the second gear 1522. The first gear 1521 and the second gear 1522 have different numbers of teeth. The first gear 1521 and the second gear 1522 respectively mesh with the fixed gear ring 121 and the moving gear ring 122. The fixed gear ring 121 is sandwiched between the outer ring 131 of the base 110 and the output part 130. The moving gear ring 122 is fixedly connected to the inner ring 132 of the output part 130 by fasteners. The fixed gear ring 121 is fixed and the moving gear ring 122 rotates relative to the fixed gear ring 121. To avoid interference between the fixed gear ring 121 and the moving gear ring 122, a gap is provided between the fixed gear ring 121 and the moving gear ring 122 in the axial direction. The first gear 1521 meshes with the fixed gear ring 121, and the second gear 1522 meshes with the movable gear ring 122. To avoid interference between the first gear 1521 and the movable gear ring 122, and between the second gear 1522 and the fixed gear ring 121, a groove 170 is provided between the first gear 1521 and the second gear 1522. The width of the groove 170 is greater than the gap between the fixed gear ring 121 and the movable gear ring 122. This ensures that when the first gear 1521 is meshing with the fixed gear ring 121, and the second gear 1522 is meshing with the movable gear ring 122, there will be no interference between the first gear 1521 and the movable gear ring 122, and no interference between the second gear 1522 and the fixed gear ring 121. By setting the first gear 1521 and the second gear 1522 to have the same module but different numbers of teeth, the transmission ratio can be set.

[0041] Combination Figure 1As shown, the output section 130 includes a crossed roller bearing 133, wherein the outer ring 131, the inner ring 132, and the rollers together form the crossed roller bearing 133. The outer ring 131 is fixedly connected to the fixed gear ring 121, and the inner ring 132 is fixedly connected to the movable gear ring 122. The outer ring 131 is provided with bolt holes 180 for fixed connection with the fixed gear ring 121 and the base 110. The inner ring 132 is provided with screw holes, and the movable gear ring 122 is provided with through holes corresponding to the screw holes of the inner ring 132. The movable gear ring 122 and the inner ring 132 are fixedly connected by screws.

[0042] Combination Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 As shown, the base 110, the fixed gear ring 121, and the outer ring 131 are provided with multiple sets of corresponding and interconnected bolt holes 180 to connect the three together using long bolts. Each set of bolt holes 180 passes through the base 110, the fixed gear ring 121, and the outer ring 131 of the output section 130 simultaneously, and the long bolts pass through the bolt holes 180 to connect the base 110, the fixed gear ring 121, and the outer ring 131 of the output section 130 together. The multiple sets of bolt holes 180 are evenly distributed circumferentially.

[0043] Combination Figure 1 As shown, the hollow-type single planetary reducer 100 with a sun gear also includes a cylindrical pin 190 and a needle roller 200. The cylindrical pin 190 is fixedly mounted on the planet carrier 151. A double gear 152 is fitted around the cylindrical pin 190. The axis of the cylindrical pin 190 is parallel to the axis of rotation of the planet carrier 151. The planet carrier 151 has a pin hole, and the cylindrical pin 190 is fixedly mounted on the planet carrier 151 by inserting it into the pin hole. The cylindrical pin 190 and the pin hole have an interference fit to fix the relative position between the cylindrical pin 190 and the planet carrier 151 and prevent the cylindrical pin 190 from moving axially relative to the planet carrier 151. The double gear 152 is fitted around the cylindrical pin 190, and the needle roller 200 is installed between the cylindrical pin 190 and the double gear 152. The planetary gear is provided with a mounting groove for the double gear 152. The width of the mounting groove is adapted to the width of the double gear 152 so that the axial movement space of the double gear 152 is less than the width of the groove 170, so as to prevent the first gear 1521 from interfering with the moving gear ring 122 and the second gear 1522 from interfering with the fixed gear ring 121.

[0044] Combination Figure 1As shown, multiple positioning surfaces 210 are provided on the inner wall of the base 110, the inner wall of the outer ring 131, and the inner wall of the inner ring 132. The planetary carrier 151, the fixed gear ring 121, the movable gear ring 122, and the central shaft 141 are all positioned with reference to the corresponding positioning surfaces 210 to determine their relative positions. The fixed gear ring 121 has a first positioning interface corresponding to the base 110, and the base 110 is adapted to and connected to the first positioning interface; the fixed gear ring 121 has a second positioning interface corresponding to the outer ring 131, and the outer ring 131 is adapted to and connected to the second positioning interface. The first positioning interface includes mutually perpendicular positioning surfaces 210, and one end of the base 110 is in contact with two surfaces of the first positioning interface. The second positioning interface has mutually perpendicular positioning surfaces 210, and one end of the outer ring 131 is in contact with two surfaces of the second positioning interface.

[0045] Combination Figure 1 As shown, in some embodiments, an oil seal 136 mounting groove is provided between the inner ring 132 and the outer ring 131, and the output part 130 also includes an oil seal 136, which is installed in the oil seal 136 mounting groove.

[0046] For example, the hollow single planetary reducer 100 with a sun gear provided in this embodiment can be installed according to the following steps: Step 1: Install oil seal 136, bearing 134 and bearing 135 into crossed roller bearing 133.

[0047] The crossed roller bearing 133 has an oil seal 136 mounting groove between the inner ring 132 and the outer ring 131 at one end of the output port 162. The oil seal 136 mounting groove corresponds to the gap between the inner ring 132 and the outer ring 131. The inner ring 132 has a bearing mounting position at one end inside the housing 160, and bearing one 134 and bearing two 135 are respectively installed in the corresponding bearing positions.

[0048] Step 2: Secure the moving gear ring 122 to the inner ring 132 of the crossed roller bearing 133 using screws.

[0049] Step 3: Insert the needle roller 200 into the double gear 152, and use the cylindrical pin 190 to fix the double gear 152 into the planetary carrier 151.

[0050] Step 4: Install the planetary carrier 151, which was installed in Step 3, in the corresponding positions to the moving gear ring 122.

[0051] Step 5: Install bearing 230 to planetary carrier 151 and bearing 220 to central shaft 141.

[0052] The base 110 is provided with bearing positions corresponding to the planetary carrier 151 and the central shaft 141, and bearings 220 and 230 are respectively installed in the corresponding bearing positions.

[0053] Step 6: Insert the central shaft 141 with bearing 320 installed into the planetary carrier 151.

[0054] Step 7: Install the base 110 and fix the base 110, fixed gear ring 121 and outer ring 131 with screws.

[0055] For example, the working principle of the hollow single planetary reducer 100 with a sun gear provided in this embodiment is as follows: A hollow single planetary gear reducer with a sun gear 142 has a double gear 152 mounted in a planetary carrier 151 via a cylindrical pin 190 and a needle roller 200. The double gear 152 has a groove 170 in the middle. The first gear 1521 and the second gear 1522 have different numbers of teeth and mesh with the fixed gear ring 121 and the moving gear ring 122 respectively, acting as the driving gear and the driven gear. The first gear 1521 is the driving gear, and the second gear 1522 is the driven gear. The motor connects to the sun gear 142 and starts, causing the sun gear 142 to rotate. The rotation of the sun gear 142 drives the driving gear 152 (the first gear 1521) to mesh with the fixed gear ring 121, and the driven gear 1522 (the second gear 1522) to rotate in conjunction with it, meshing with the moving gear ring 122. The fixed gear ring 121 is fixed to the outer ring 131 of the crossed roller bearing 133, and the moving gear ring 122 drives the inner ring 132 of the crossed roller bearing 133 to rotate together for output. The single planetary carrier 151 has a single double gear 152. The double gear 152 consists of two sections with different numbers of teeth: a driving gear and a driven gear. The driving gear is matched with the fixed gear ring 121, and the driven gear is matched with the moving gear ring 122. The entire double gear 152 engages and disengages simultaneously.

[0056] The formula for calculating the speed ratio is: i=Z 动 / [(Z 动 -Z 定 / Z 主 ×Z 从 )×Z 定 / Z 太 ]; Among them, Z 太 Z represents the number of teeth or pitch circle diameter of the sun gear (142). 定 For a fixed gear ring with 121 teeth or pitch circle diameter, Z 动 Z represents the number of teeth or pitch circle diameter of the moving gear ring (122). 从 Z represents the number of teeth on the driven gear of the traveling gear, i.e., the number of teeth on the second gear (1522) or the pitch circle diameter. 主 This refers to the number of teeth on the driving gear of the wheel, i.e., the number of teeth on the first gear 1521, or the pitch circle diameter.

[0057] The foregoing description and accompanying drawings fully illustrate embodiments of this disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations, and unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terminology used in this application is for describing embodiments only and is not intended to limit the claims. As used in the description of embodiments and claims, the numeral forms “a,” “an,” and “the” are intended to equally include the plural forms unless the context clearly indicates otherwise. Similarly, the term “and / or” as used in this application means including one or more of the associated listed any and all possible combinations. Additionally, when used in this application, the terms “comprise” and its variations “comprises” and / or “comprising” refer to the presence of stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Unless otherwise specified, an element defined by the phrase "comprising a..." does not exclude the presence of other identical elements in the process, method, or apparatus that includes said element. In this document, each embodiment may focus on its differences from other embodiments, and similar or identical parts between embodiments can be referred to mutually. For methods, products, etc., disclosed in the embodiments, if they correspond to the method section disclosed in the embodiments, then the relevant parts can be referred to the description of the method section.

[0058] The above-described embodiments merely illustrate several implementation methods of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described. However, as long as the combinations of these technical features do not contradict each other, they should be considered within the scope of this specification. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A hollow single planetary gear reducer with a sun gear, characterized in that, include: The base (110) is a ring structure; The gear ring assembly (120) is fixedly connected to the base (110) axially; The output section (130) includes an outer ring (131) and an inner ring (132) that rotate relative to each other, and the outer ring (131) is fixedly connected to the gear ring assembly (120) along the axial direction; The base (110), gear ring assembly (120), and output section (130) are connected in sequence to form a housing (160). The housing (160) includes an axially connected inlet (161) and an outlet (162). A central shaft assembly (140) is rotatably mounted in the housing (160) from the inlet (161) to the outlet (162); the central shaft assembly (140) includes a central shaft (141) and a sun gear (142) fixedly mounted on the central shaft (141). The planetary section (150) includes a planet carrier (151) and a double gear (152) rotatably mounted on the planet carrier (151); the planet carrier (151) is rotatably sleeved on the outside of the central shaft assembly (140); the double gear (152) simultaneously meshes with the sun gear (142) and the gear ring assembly (120).

2. The single-pulley reduction gear with a sun gear of hollow type according to claim 1, characterized in that, The gear ring assembly (120) includes: A fixed gear ring (121) is fixedly connected to the machine base (110) along the axial direction; The movable gear ring (122) is located inside the housing (160). The movable gear ring (122) is adjacent to the fixed gear ring (121) and is fixedly connected to the inner ring (132).

3. The hollow single planetary reducer with a sun gear according to claim 2, characterized in that, The planetary carrier (151) is hollow; The central shaft (141) is hollow and passes through the planet carrier (151), so that the hollow structure of the planet carrier (151) is combined with the hollow structure of the central shaft (141); the two ends of the central shaft (141) are mounted on the base (110) and the inner ring (132) through bearings.

4. The single-pulley reduction gear with a sun gear of hollow type according to claim 2, characterized by The double gear (152) includes: The first gear (1521) and the second gear (1522) are arranged side by side along the axial direction. The first gear (1521) meshes externally with the sun gear (142) and meshes internally with the fixed gear ring (121). The second gear (1522) meshes internally with the moving gear ring (122).

5. The hollow single planetary reducer with a sun gear according to claim 4, characterized in that, The inner edge of the fixed gear ring (121) is provided with a clearance groove (1211) corresponding to the second gear (1522), and one end of the moving gear ring (122) is installed in the clearance groove (1211) to mesh with the second gear (1522).

6. The hollow single planetary reducer with a sun gear according to claim 4, characterized in that, The first gear (1521) and the second gear (1522) have different numbers of teeth.

7. The hollow single planetary reducer with a sun gear according to claim 1, characterized in that, The output section (130) includes a cross roller bearing (133), wherein the cross roller bearing (133) includes an outer ring (131), an inner ring (132) and rollers, the outer ring (131) is fixedly connected to the fixed gear ring (121), and the inner ring (132) is fixedly connected to the moving gear ring (122).

8. The hollow single planetary reducer with a sun gear according to claim 7, characterized in that, The base (110), the fixed gear ring (121), and the outer ring (131) are provided with multiple sets of corresponding and connected bolt holes (180) so as to connect the three together by long bolts.

9. The hollow type single planet reduction gear having a sun gear according to claim 1, characterized by, Also includes: A cylindrical pin (190) is fixedly installed on the planet carrier (151); The double gear (152) is fitted onto the cylindrical pin (190); Needle roller (200) is installed between cylindrical pin (190) and double gear (152).

10. The hollow single planetary reducer with a sun gear according to any one of claims 1 to 9, characterized in that, Multiple positioning surfaces (210) are provided on the inner wall of the base (110), the inner wall of the outer ring (131) and the inner wall of the inner ring (132); The planetary carrier (151), fixed gear ring (121), moving gear ring (122) and central shaft (141) are all positioned with the corresponding positioning surface (210) as a reference to determine their relative positions.

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