TWI604145B - Reducer with lubrication circuit - Google Patents

Description

Reducer with lubrication circuit

The invention relates to a cycloidal speed reducer, in particular to a speed reducer with a lubrication circuit.

According to the rapid development of automation demand, the importance of the robot industry is also increasing. The urgency of the lubrication problems required for gearboxes that play an important role in the robot industry is also increasing. The reducer uses a gear configuration to achieve a power-driven device that makes the output speed lower than the input speed and the output torque is higher than the input torque. For example, U.S. Patent No. 8403789B2 is known as a speed reduction mechanism that utilizes a combination of a cycloidal drive and an Oldham shaft coupling to achieve deceleration and bilateral output. Further, as disclosed in Japanese Patent No. 2011-64219A, a cycloid type speed reducing device is also disclosed, and the deceleration effect is also achieved. However, none of the aforementioned known techniques have been designed for a lubricating structure. After a long period of operation, the lubricating oil filled in the speed reducing mechanism is likely to accumulate in a part of the gap, and the lubricating effect between the members is lowered.

SUMMARY OF THE INVENTION A primary object of the present invention is to provide a reducer having a lubrication circuit that enhances the effect of lubricating the reducer member of the lubricating oil.

The invention relates to a speed reducer with a lubrication circuit according to the invention, comprising: a casing, an inner tooth is arranged on the inner circumferential surface; a cycloidal wheel is arranged in the casing, and the outer circumferential surface of the cycloidal wheel An outer tooth is disposed, the outer tooth engages the inner tooth, the cycloid wheel forms a first receiving groove on a side surface, the middle portion of the cycloidal wheel has a first hole; and a transmission plate has an outer peripheral surface protruding outwardly a first convex portion and a second convex portion, the first convex portion is disposed in the first receiving groove, the middle portion of the driving plate has a second hole; an input shaft is disposed through the first hole and the first portion In the two holes, the middle portion of the input shaft protrudes outwardly from an eccentric portion, the eccentric portion is sleeved in the first hole to drive the cycloidal wheel; and an output member is pivotally disposed in the housing, the output member and the pendulum The driving plate is disposed between the reels, the output component has a second receiving groove, and the second receiving groove receives the second convex portion; the output component has a first return channel and a second return channel. The first return channel communicates with the second receiving groove, and the second return channel communicates with the first return flow Road.

Thereby, the lubricating oil located in the second accommodating groove is pressed by the second convex portion to flow into the second return passage when the second convex portion moves, and then flows out from the first return passage to The second accommodating groove allows the lubricating oil to flow to enhance the efficiency of lubricating the reducer member and reduce the accumulation of lubricating oil.

In addition, a sleeve is sleeved on the housing, and an oil seal is further disposed between the sleeve and the output member. This prevents oil leakage.

The output component can also be formed into a third accommodating groove, and the third accommodating groove communicates with the first return channel and the second return channel, respectively. There is a plug at one end, which is inserted into the third accommodating groove, so that the user can move the end plug to observe the lubricating oil condition or fill the lubricating oil.

Alternatively, the end plug has an open oil chamber that communicates with the first return passage and a third return passage that communicates with the open oil chamber and the second return passage.

There is another way, the third receiving groove is annular, and when the number of the first return channel and the second return channel is plural, the third receiving groove and each of the first return channel and the second return channel Connected.

11‧‧‧Shell

112‧‧‧Flange

121‧‧‧ external teeth

123‧‧‧ first hole

131‧‧‧First convex

133‧‧‧ second hole

141‧‧‧Eccentric

151‧‧‧Second accommodating slot

153‧‧‧second return channel

16‧‧‧ casing

18‧‧‧End plug

182‧‧‧ Third return channel

111‧‧‧ internal teeth

12‧‧‧Cycloid

122‧‧‧First accommodating slot

13‧‧‧ drive plate

132‧‧‧second convex

14‧‧‧ Input shaft

15‧‧‧Output components

152‧‧‧First return channel

154‧‧‧The third accommodating slot

17‧‧‧ oil seal

181‧‧‧Open oil room

Figure 1 is a perspective view of a first preferred embodiment of the present invention.

Figure 2 is an exploded view of a first preferred embodiment of the present invention.

Figure 3 is an exploded view of a first preferred embodiment of the present invention.

Figure 4 is a front elevational view of a first preferred embodiment of the present invention.

Figure 5 is a cross-sectional view taken along line 4-5 of Figure 4 of the first preferred embodiment of the present invention.

Figure 6 is a cross-sectional view showing a portion of the output member of the first preferred embodiment of the present invention and a cross-sectional view of the end plug.

Figure 7 is a perspective view of the end plug of the first preferred embodiment of the present invention.

Figure 8 is a partial cross-sectional view taken along line 4-8 of Figure 4 of the first preferred embodiment of the present invention.

Figure 9 is a perspective exploded view of the output member and the end plug of the second preferred embodiment of the present invention.

Figure 10 is a perspective view of an output member of a second preferred embodiment of the present invention.

In order to explain the technical features of the present invention in detail, the following preferred embodiments are described with reference to the accompanying drawings, wherein: FIG. 1-7 shows a first preferred embodiment of the present invention. The reduction gear of the lubrication circuit comprises: a casing 11, a cycloidal wheel 12, a transmission plate 13, an input shaft 14, and an output member 15.

The inner casing surface of the casing 11 is provided with an inner tooth 111. In the present embodiment, the housing 11 has a cylindrical shape, and a flange portion 112 is formed on the periphery. Further, the inner teeth 111 are formed by a plurality of needle rollers.

The cycloidal disk 12 is disposed in the housing 11. The outer circumferential surface of the cycloidal wheel 12 is provided with an external tooth 121. The external tooth 121 engages the internal tooth 111. The cycloidal wheel 12 forms a side surface. The first receiving groove 122 has a first hole 123 in the middle portion of the cycloidal wheel 12.

The driving plate 13 has a first convex portion 131 and a second convex portion 132 protruding outwardly from the outer peripheral surface of the driving plate 13. The first protruding portion 131 is disposed on the first receiving groove 122, and the middle portion of the driving plate 13 has a first portion Two holes 133. In the embodiment, the first convex portion 131 and the second convex portion 132 are at right angles.

The input shaft 14 is disposed in the first hole 123 and the second hole 133. The middle portion of the input shaft 14 protrudes outwardly from an eccentric portion 141. The eccentric portion 141 is sleeved on the first hole 123 to drive the pendulum. Reel 12.

The output member 15 is pivotally disposed in the housing 11. The driving plate 13 is disposed between the output member 15 and the cycloidal wheel 12. The output member 15 has a second receiving slot 151. The second receiving portion The groove 151 accommodates the second protrusion 132. The output member 15 has a first return passage 152 and a second return passage 153. The first return passage 152 communicates with the second receiving groove 151. The second return passage 153 communicates with the first return passage 152. In addition, in the embodiment, the housing 11 and the output member 15 have a gap (not shown in the figure due to the small size), and the second return passage 153 communicates with the outer surface of the output member 15, from which the lubricating oil is The gap is returned to the second return passage 153. However, not limited thereto, the second return passage 153 only needs to communicate with the second accommodating groove 151 and achieve a lubricating oil recirculation effect.

In addition to the above structure, as shown in FIG. 5, in the present embodiment, a sleeve 16 is sleeved on the housing 11 to be fixed to the flange portion 112, and between the sleeve 16 and the output member 15. An oil seal 17 is further provided to prevent oil leakage. As shown in FIG. 6, the output member 15 can be formed with a third receiving groove 154. The third receiving groove 154 communicates with the first return channel 152 and the second return channel 153, respectively.

As shown in Figures 6 and 7, there is a further end plug 18 that is inserted into the third receiving groove 154 to facilitate the user to move the end plug 18 to observe the lubricating oil condition or fill the lubricating oil. In this embodiment, the end plug 18 has an open oil chamber 181 and a third return passage 182. The open oil chamber 181 communicates with the first return passage 152. The third return passage 182 communicates with the open oil chamber 181 and The second return passage 153.

Please refer to Fig. 8, and the use of the embodiment will be described next.

When the motor power is transmitted to the input shaft 14, the input shaft 14 will start to rotate. At the same time, the eccentric portion 141 will drive the cycloidal wheel 12, and the internal teeth 111 are meshed through the external teeth 121. The cycloidal wheel 12 The first convex portion 131 of the driving plate 13 is moved in the first accommodating groove 122, and the second convex portion 132 of the driving plate 13 is also moved. Since the second convex portion 132 is located in the second accommodating groove 151, the second convex portion 132 drives the output member 15 in the second accommodating groove 151, thereby generating a deceleration effect.

During the above operation, the lubricating oil located in the second receiving groove 151 will be pressed by the second convex portion 132 from the housing 11 and the output member 15 when the second convex portion 132 moves. The gap flows into the second return passage 153, and flows through the third return passage 182 to the second receiving groove 151 to allow the lubricating oil to flow to enhance the efficiency of lubricating the reducer member. And reduce the accumulation of lubricating oil.

In addition, the lubricating oil located in the second receiving groove 151 can also be pressed by the second convex portion 132 from the bearing between the output shaft 14 and the output member 15 when the second convex portion 132 moves (if When there is a setting, the bearing is lubricated and flows into the second return passage 153, and flows through the third return passage 182 back to the second receiving groove 151 to allow the lubricating oil to flow to enhance Lubricates the efficiency of the reducer components and reduces the build up of lubricant.

The first preferred embodiment of the present invention has been described above. Referring to Figures 9 and 10, a second preferred embodiment of the present invention will now be described, which differs from the first preferred embodiment in that the end plug 18 is annular. The third receiving groove 154 is annular, and the number of the first return channel 152 and the second return channel 153 is plural. The third receiving groove 154 and each of the first return channel 153 and the second return channel 154 Connected. As a result, the return flow of the lubricating oil will increase, and the effect of the lubricating oil flowing to lubricate the reducer member can be enhanced.

11‧‧‧Shell

111‧‧‧ internal teeth

112‧‧‧Flange

12‧‧‧Cycloid

121‧‧‧ external teeth

123‧‧‧ first hole

13‧‧‧ drive plate

131‧‧‧First convex

132‧‧‧second convex

133‧‧‧ second hole

14‧‧‧ Input shaft

141‧‧‧Eccentric

15‧‧‧Output components

151‧‧‧Second accommodating slot

152‧‧‧First return channel

153‧‧‧second return channel

16‧‧‧ casing

17‧‧‧ oil seal

18‧‧‧End plug

Claims (6)

A reducer with a lubrication circuit, comprising: a casing, an inner tooth is arranged on the inner circumferential surface; a cycloidal wheel is disposed in the casing, and an outer tooth is arranged on the outer circumferential surface of the cycloidal wheel, and the outer tooth meshes The inner tooth has a first receiving groove formed on the side, the middle portion of the cycloidal wheel has a first hole; and a driving plate whose outer peripheral surface protrudes outwardly by a first convex portion and a second convex portion The first convex portion is disposed in the first accommodating groove, and the middle portion of the driving plate has a second hole; an input shaft is disposed in the first hole and the second hole, and the input shaft is in the middle direction An eccentric portion is protruded outwardly, the eccentric portion is sleeved in the first hole to drive the cycloidal wheel; and an output member is pivotally disposed in the housing, and the transmission plate is disposed between the output member and the cycloidal wheel, The output member has a second receiving groove, the second receiving groove accommodating the second protruding portion; the output member has a first return channel and a second return channel, the first return channel is connected to the first The second receiving channel communicates with the first return channel. A speed reducer with a lubrication circuit according to claim 1, wherein: a gap is formed between the casing and the output member, and the second return passage communicates with the outer surface of the output member and the first return passage, and the lubricating oil is The gap flows back to the second return passage and then flows back to the first return passage to form a circulating lubrication. A speed reducer with a lubrication circuit according to claim 1, wherein: a sleeve is sleeved on the housing, and an oil seal is further disposed between the sleeve and the output member. A speed reducer with a lubrication circuit according to claim 1, wherein the output member forms a third receiving groove, and the third receiving groove communicates with the first return channel and the second return channel respectively; One end plugs and is inserted into the third receiving groove. A speed reducer with a lubrication circuit according to claim 4, wherein the end plug has an open oil chamber and a third return passage, the open oil chamber communicates with the first return passage, and the third return passage communicates with the An oil chamber and the second return passage are opened. A speed reducer with a lubrication circuit according to claim 4, wherein: the end plug is annular; the third receiving groove is annular, and when the number of the first return passage and the second return passage is plural, The third receiving groove is in communication with each of the first return channel and the second return channel.