CN108240459B

CN108240459B - Speed reducer with lubricating loop

Info

Publication number: CN108240459B
Application number: CN201611215340.1A
Authority: CN
Inventors: 郑旭珉; 林于涵; 邱政民
Original assignee: Hiwin Technologies Corp
Current assignee: Hiwin Technologies Corp
Priority date: 2016-12-26
Filing date: 2016-12-26
Publication date: 2020-11-24
Anticipated expiration: 2036-12-26
Also published as: CN108240459A

Abstract

A reducer having a lubrication circuit, comprising: the inner ring of the shell is provided with inner teeth; the cycloidal gear is arranged on the outer peripheral surface of the shell and is provided with external teeth which are meshed with the internal teeth, and the cycloidal gear forms a first accommodating groove and a first hole; the transmission plate protrudes out of the first convex part and the second convex part, the first convex part is arranged in the first accommodating groove, and the transmission plate is provided with a second hole; the input shaft penetrates through the first hole and the second hole and is provided with an eccentric part sleeved in the first hole. The output assembly is pivoted in the shell, is provided with a second containing groove for containing the second convex part, and is provided with a first return channel and a second return channel, wherein the first return channel is communicated with the second containing groove, and the second return channel is communicated with the first return channel. Therefore, the lubricating oil is extruded to flow into the second return passage and then return to the first return passage, so that the lubricating oil flows to enhance the lubrication of the speed reducer component and reduce the accumulation of the lubricating oil.

Description

Speed reducer with lubricating loop

Technical Field

The invention relates to a cycloidal speed reducer, in particular to a speed reducer with a lubricating loop.

Background

With the explosion of automation requirements, the importance of the robot industry is increasing. The lubrication of speed reducers, which play an important role in the robot industry, is also increasing in urgency. The speed reducer is a power device which uses a gear configuration to achieve the purposes that the output rotating speed is lower than the input rotating speed, and the output torque is higher than the input torque. For example, U.S. Pat. No. 8403789B2 discloses a reduction mechanism that achieves reduction and double-side output by using a combination of a cycloidal reduction structure (cycloidal drive) and an Oldham draft coupling (Oldham draft coupling). Also, as disclosed in japanese patent No. 2011-64219A, a cycloid type speed reduction device is also disclosed, and the speed reduction effect is also achieved. However, none of the above prior arts has been designed for a lubrication structure in which the lubricating oil filled in the speed reducing mechanism is liable to accumulate in a part of the gap after a long period of operation, and the lubricating efficiency between the members is lowered.

Disclosure of Invention

The main object of the present invention is to provide a speed reducer with a lubrication circuit, which can enhance the effect of lubricating the speed reducer components by lubricating oil.

Therefore, according to the present invention, a speed reducer with a lubrication circuit comprises: a shell, wherein the inner peripheral surface is annularly provided with an inner tooth; the cycloidal gear is arranged in the shell, the outer peripheral surface of the cycloidal gear is provided with an outer tooth, the outer tooth is meshed with the inner tooth, the side surface of the cycloidal gear forms a first accommodating groove, and the middle part of the cycloidal gear is provided with a first hole; a transmission plate, the outer peripheral surface of which protrudes outwards to form a first convex part and a second convex part, the first convex part is arranged in the first containing groove, and the middle part of the transmission plate is provided with a second hole; the input shaft penetrates through the first hole and the second hole, an eccentric part protrudes outwards from the middle section of the input shaft, and the eccentric part is sleeved in the first hole to drive the cycloid wheel; the output assembly is pivoted in the shell, the transmission plate is arranged between the output assembly and the cycloidal gear, the output assembly is provided with a second accommodating groove, and the second accommodating groove is provided with the second convex part; the output assembly is provided with a first return channel and a second return channel, the first return channel is communicated with the second containing groove, and the second return channel is communicated with the first return channel.

Therefore, the lubricating oil in the second containing groove is extruded by the second convex part when the second convex part moves, flows into the second return channel and flows out of the first return channel to the second containing groove, so that the lubricating oil flows to enhance the effect of lubricating the speed reducer component and reduce the accumulation of the lubricating oil.

In addition, a sleeve is sleeved on the shell, and an oil seal is further arranged between the sleeve and the output assembly. Thereby preventing oil leakage.

The output assembly can also form a third containing groove which is respectively communicated with the first return channel and the second return channel. The end plug is plugged into the third containing groove, so that a user can conveniently move the end plug to observe the condition of the lubricating oil or fill the lubricating oil.

Or, the end plug is provided with an open oil chamber and a third return channel, the open oil chamber is communicated with the first return channel, and the third return channel is communicated with the open oil chamber and the second return channel.

In another embodiment, the third receiving cavity is annular, and when the number of the first return channels and the number of the second return channels are plural, the third receiving cavity is communicated with each of the first return channels and the second return channels.

Drawings

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

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

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

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

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

Fig. 6 is a partial cross-sectional view of the output assembly and a cross-sectional view of the end plug of the first preferred embodiment of the present invention.

Figure 7 is a perspective view of an end plug according to a first preferred embodiment of the invention.

Fig. 8 is a sectional view taken along the 8-8 line of fig. 4 in accordance with the first preferred embodiment of the present invention.

Fig. 9 is an exploded perspective view of the output assembly and end plug of a second preferred embodiment of the present invention.

Fig. 10 is a perspective view of an output assembly in accordance with a second preferred embodiment of the present invention.

[ notation ] to show

11 case 111 internal teeth

112 flange part 12 cycloid wheel

121 outer teeth 122 first accommodation groove

123 first hole 13 driving plate

131 first projection 132 second projection

133 second bore 14 input shaft

141 eccentric 15 output assembly

151 second receiving groove 152 first return path

153 second reflow channel 154 third container

16 casing 17 oil seal

18 end plug 181 open oil chamber

182 third return passage

Detailed Description

To illustrate the technical features of the present invention in detail, the following preferred embodiments are described with reference to the drawings, in which:

as shown in fig. 1 to 7, a reducer with a lubrication circuit according to a first preferred embodiment of the present invention includes: a housing 11, a cycloidal gear 12, a drive plate 13, an input shaft 14 and an output assembly 15.

The inner peripheral surface of the housing 11 is annularly provided with an inner tooth 111. In the embodiment, the housing 11 is cylindrical, and a flange 112 is formed on the periphery, and the internal teeth 111 are formed by a plurality of needles.

The cycloidal gear (cycloidal disk)12 is disposed in the housing 11, an outer tooth 121 is disposed on an outer peripheral surface of the cycloidal gear 12, the outer tooth 121 is engaged with the inner tooth 111, a first accommodating groove 122 is formed on a side surface of the cycloidal gear 12, and a first hole 123 is formed in a middle portion of the cycloidal gear 12.

The outer peripheral surface of the driving plate 13 protrudes outward to form a first protrusion 131 and a second protrusion 132, the first protrusion 131 is disposed in the first receiving groove 122, and the middle portion of the driving plate 13 has a second hole 133. In the present embodiment, the first protrusion 131 and the second protrusion 132 are at right angles.

The input shaft 14 penetrates through the first hole 123 and the second hole 133, an eccentric portion 141 protrudes outwards from the middle section of the input shaft 14, and the eccentric portion 141 is sleeved in the first hole 123 to drive the cycloid wheel 12.

The output assembly 15 is pivotally disposed in the housing 11, the transmission plate 13 is disposed between the output assembly 15 and the cycloid wheel 12, the output assembly 15 has a second receiving groove 151, and the second receiving groove 151 receives the second protrusion 132. The output assembly 15 has a first return channel 152 and a second return channel 153, the first return channel 152 is connected to the second container 151, and the second return channel 153 is connected to the first return channel 152. In addition, in the embodiment, a gap (not shown in the figures due to the undersize) is formed between the housing 11 and the output assembly 15, the second return channel 153 communicates with the outer surface of the output assembly 15, and the lubricating oil flows back to the second return channel 153 from the gap. However, without being limited thereto, the second backflow channel 153 only needs to be communicated with the place outside the second receiving groove 151, and the effect of backflow of the lubricating oil is achieved.

In addition to the above structure, as shown in fig. 5, in this embodiment, a sleeve 16 is sleeved on each of the flanges 112 of the housing 11, and an oil seal 17 is further disposed between the sleeve 16 and the output assembly 15, so as to prevent oil leakage. As shown in fig. 6, the output assembly 15 may further form a third receiving cavity 154, and the third receiving cavity 154 is respectively connected to the first return channel 152 and the second return channel 153.

As shown in fig. 6 and 7, there is an end plug 18 plugged into the third receiving groove 154, which is convenient for the user to move the end plug 18 to observe the condition of the lubricant or to fill the lubricant. In the embodiment, the end plug 18 has an open oil chamber 181 and a third return channel 182, the open oil chamber 181 is communicated with the first return channel 152, and the third return channel 182 is communicated with the open oil chamber 181 and the second return channel 153.

Referring to fig. 8, the usage of the present embodiment is described next.

After the power of the motor is transmitted to the input shaft 14, the input shaft 14 will start to rotate, and at the same time, the eccentric portion 141 will drive the cycloid wheel 12, and the outer teeth 121 engage with the inner teeth 111, so that the cycloid wheel 12 drives the first protruding portion 131 of the transmission plate 13 to move in the first accommodating groove 122, and at the same time, the second protruding portion 132 of the transmission plate 13 also moves accordingly. Since the second protrusion 132 is located in the second receiving groove 151, the second protrusion 132 drives the output assembly 15 in the second receiving groove 151, thereby generating a deceleration effect.

In the above operation process, when the second protrusion 132 moves, the lubricant in the second containing groove 151 is pressed by the second protrusion 132 and flows into the second return channel 153 from the gap between the housing 11 and the output assembly 15, and flows back to the second containing groove 151 from the first return channel 152 through the third return channel 182, so that the lubricant flows to enhance the effect of lubricating the speed reducer components and reduce the accumulation of the lubricant.

In addition, when the second protrusion 132 moves, the lubricant in the second receiving groove 151 may be squeezed by the second protrusion 132 to flow to the bearing (if provided) between the output shaft 14 and the output assembly 15, so as to lubricate the bearing, flow into the second return channel 153, flow through the third return channel 182, and flow back to the second receiving groove 151 from the first return channel 152, so that the lubricant flows to enhance the effect of lubricating the speed reducer member and reduce the accumulation of the lubricant.

The first preferred embodiment of the present invention is described above, and referring to fig. 9 and 10, a second preferred embodiment of the present invention is next described, which is different from the first preferred embodiment in that: the end plug 18 is ring-shaped. The third receiving groove 154 is annular, the number of the first return channels 152 and the number of the second return channels 153 are plural, and the third receiving groove 154 is communicated with each of the first return channels 153 and the second return channels 154. In this way, the amount of return of the lubricating oil is increased, and the effect of lubricating the speed reducer member by the flow of the lubricating oil can be enhanced.

Claims

1. A speed reducer with a lubrication circuit is characterized by comprising:

a shell, wherein the inner peripheral surface is annularly provided with an inner tooth;

the cycloidal gear is arranged in the shell, the outer peripheral surface of the cycloidal gear is provided with an outer tooth, the outer tooth is meshed with the inner tooth, the side surface of the cycloidal gear forms a first accommodating groove, and the middle part of the cycloidal gear is provided with a first hole;

a transmission plate, the outer peripheral surface of which protrudes outwards to form a first convex part and a second convex part, the first convex part is arranged in the first containing groove, and the middle part of the transmission plate is provided with a second hole;

the input shaft penetrates through the first hole and the second hole, an eccentric part protrudes outwards from the middle section of the input shaft, and the eccentric part is sleeved in the first hole to drive the cycloid wheel; and

the output assembly is pivoted in the shell, the transmission plate is arranged between the output assembly and the cycloidal gear, the output assembly is provided with a second accommodating groove, and the second accommodating groove is provided with the second convex part; the output assembly is provided with a first return channel and a second return channel, the first return channel is communicated with the second containing groove, and the second return channel is communicated with the first return channel;

a gap is formed between the shell and the output assembly, the second return channel is communicated with the outer surface of the output assembly and the first return channel, and the lubricating oil returns to the second return channel from the gap and then returns to the first return channel to form circulating lubrication;

the output assembly forms a third containing groove which is respectively communicated with the first return channel and the second return channel; and an end plug inserted into the third accommodating groove, wherein:

the end plug is provided with an open oil chamber and a third return channel, the open oil chamber is communicated with the first return channel, and the third return channel is communicated with the open oil chamber and the second return channel.

2. The speed reducer with lubrication circuit according to claim 1, wherein: a sleeve is sleeved on the shell, and an oil seal is arranged between the sleeve and the output assembly.

3. The speed reducer with lubrication circuit according to claim 1, wherein: the end plug is annular; the third containing groove is annular, and when the number of the first return channels and the number of the second return channels are multiple, the third containing groove is communicated with each of the first return channels and the second return channels.