Cooling structure of speed reducer

Abstract

The utility model relates to the technical field of cooling devices, in particular to a cooling structure of a speed reducer, which comprises a motor box body, a speed reducer box body connected to the end part of the motor box body through screws, and a motor bearing end cover connected to the other end of the motor box body through screws, four mounting holes are formed in the motor box body, motors are fixed in the mounting holes, a plurality of axial water channels are formed in the peripheries of the mounting holes, the axial water channels are not adjacent to one another, a plurality of channel holes are further formed in the axial water channels, and a plurality of circulating grooves are formed in the speed reducer box body and the motor bearing end cover. The multiple axial water channels are sequentially communicated end to end through the circulating grooves to form a circulating water channel. The structure is suitable for cooling the multi-motor integrated speed reducer, the machining difficulty of the circulating water channel can be reduced, the number of assembly workpieces is reduced, and the heat dissipation effect of the multi-motor integrated speed reducer is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of cooling devices, in particular to a cooling structure of a reducer. Background Art

[0002] A reducer is a power transmission mechanism that uses gear transmission to reduce the number of revolutions of the motor to the required number of revolutions, thereby obtaining a larger torque. When the reducer is working, the motor is prone to heat up. In order to achieve heat dissipation of the motor, a coolant channel is usually designed in the mounting box outside the motor. The heat of the motor is taken away by the circulation of the coolant in the channel to achieve the purpose of heat dissipation. For example, the prior art "Water-cooled motor structure and water-cooled housing" (publication number: CN104798293B) designs multiple partition walls in the motor housing, and a water channel flow path is formed between the partition walls. The cooling water circulates in the flow path to achieve the purpose of heat dissipation. However, the prior art still has the following technical problems:

[0003] The partition wall of the motor casing is thin, and the heat of the cooling water in the adjacent flow paths will be exchanged. The cooling water in the latter flow path has absorbed more motor heat, and will produce a temperature difference with the cooling water in the previous flow path. When the partition wall is thin, it is easy to transfer part of the heat to the cooling water in the previous flow path, causing the temperature of the cooling water in the previous flow path to increase, thereby reducing the cooling effect. Especially when used in a multi-motor integrated reducer, there are more flow paths outside the motor and the flow paths are closer to each other, which will intensify the heat exchange of the cooling water in the adjacent flow paths and greatly reduce the heat dissipation effect. Utility Model Content

[0004] The utility model provides a cooling structure for a reducer, which can solve the problem that when the existing motor heat dissipation structure is applied to a multi-motor integrated reducer, the cooling water in the previous stage flow path is easily heated up and the cooling effect is reduced.

[0005] The present application provides the following technical solutions: A cooling structure of a reducer, comprising a motor housing, a reducer housing screwed to one end of the motor housing, and a motor bearing end cover screwed to the other end of the motor housing;

[0006] The motor housing is provided with four mounting holes, in which the motor is fixed, and the outer periphery of the mounting holes is provided with four groups of axial water channels, the axial water channels are not adjacent to each other, and one end of the axial water channel close to the reducer housing is a closed surface, and a channel hole is provided on the closed surface; the reducer housing and the motor bearing end cover are also provided with flow grooves;

[0007] The four groups of axial water channels form a connected circulating water channel through the circulation grooves and the channel holes.

[0008] Beneficial effects: The circulation groove connects the axial water channel to form a connected circulating water channel, so that the cooling water can circulate back and forth in the axial water channel and take away the heat of the motor stator in the mounting hole in turn. The circulating water channel is composed of the axial water channel of the motor case and the circulation grooves of the reducer case and the motor bearing end cover, which can reduce the processing difficulty of the circulating water channel and reduce the number of assembly workpieces. At the same time, the axial water channels are not adjacent to each other. For multi-motor integrated reducers, heat exchange of cooling water in adjacent axial water channels is avoided, effectively improving the cooling effect of the reducer.

[0009] Furthermore, the cross-sectional shape of the axial water channel at the periphery of the mounting hole has at least one right angle.

[0010] Beneficial effect: The right-angled cross-sectional shape of the axial water channel is designed to be reasonably designed and laid out according to the motor housing structure. In addition, the volume of the axial water channel can be increased, so that more cooling water can be introduced, thereby enhancing the cooling effect.

[0011] Furthermore, a motor input side sealing ring is detachably connected between the motor housing and the motor bearing end cover.

[0012] Beneficial effect: The sealing ring on the motor input side seamlessly fits the contact surface between the motor housing and the motor bearing end cover, preventing leakage of cooling water in the axial water channel.

[0013] Furthermore, a motor output side sealing ring is detachably connected between the motor housing and the reducer housing.

[0014] Beneficial effect: The sealing ring on the motor output side seamlessly fits the contact surface between the motor housing and the end surface of the reducer housing, thereby preventing leakage of cooling water in the axial water channel.

[0015] Furthermore, the axial water channel includes a first water channel assembly and a second water channel assembly surrounding the mounting hole, the first water channel assembly includes water hole one, water hole two and water hole three, the water hole one, water hole two and water hole three are respectively and evenly distributed on the outer periphery of the mounting hole, water hole one and water hole two are connected through a flow groove on the reducer housing, and water hole two and water hole three are connected through a flow groove on the motor bearing end cover.

[0016] Beneficial effect: Water hole one, water hole two and water hole three are evenly spaced and distributed on the periphery of the mounting hole, so that the temperature of the cooling water in each water hole is evenly distributed, the heat exchange effect between the water holes is reduced, and the heat dissipation effect is improved.

[0017] Further, the second water channel assembly includes water hole four, water hole five, water hole six, water hole seven and a middle hole located between two adjacent mounting holes, the shapes of water hole four and water hole seven are symmetrical relative to the vertical center line of the motor case, the shapes of water hole five and water hole six are also symmetrical relative to the vertical center line of the motor case, the water hole four and water hole three, the water hole five and water hole six, the water hole seven and the middle hole are respectively connected through the flow groove on the reducer case; the water hole four and water hole five, the water hole six and water hole seven are respectively connected through the flow groove on the motor bearing end cover.

[0018] Beneficial effect: The water holes are connected at intervals through the flow grooves on the reducer housing and the motor bearing end cover, so that the cooling water flows back and forth in an S-shaped path in the axial water channel, taking away the heat of the motor in the mounting hole along the way.

[0019] Furthermore, the spacing range between water hole one and water hole two, water hole two and water hole three is 83.65~84.35mm; the spacing range between water hole three and water hole four, water hole four and water hole five, and water hole four and the middle hole in the vertical direction is 11.82~12.18mm; the spacing range between water hole four and water hole seven, water hole three and the middle hole in the horizontal direction is 15.82~16.18mm.

[0020] Beneficial effect: The horizontal and vertical spacing of each water hole is limited to prevent the water holes from being too close to each other, causing the heat of the cooling water in the latter water hole to produce a heat exchange effect on the cooling water in the former water hole, and the positions of each water hole can be reasonably arranged around the installation hole to improve the overall cooling and heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is the front view of the utility model.

[0022] Figure 2 for Figure 1 Left side view with motor bearing cover removed.

[0023] Figure 3 for Figure 2 A partial enlarged view of B.

[0024] Figure 4 for Figure 3 A partial enlarged view of C in the middle. DETAILED DESCRIPTION

[0025] The following is further described in detail through specific implementation methods:

[0026] The marks in the drawings of the specification include: motor stator 1, motor bearing cover plate 2, motor housing 3, mounting hole 301, water hole one 302, channel hole 303, water hole two 304, water hole three 305, water hole four 306, water hole five 307, water hole six 308, water hole seven 309, middle hole 310, reducer housing 4, motor input side sealing ring 5, motor output side sealing ring 6.

[0027] Embodiment 1

[0028] like Figure 1 and Figure 2 As shown, a cooling structure of a reducer includes a motor case 3, a reducer case 4 screwed to the end of the motor case 3, and a motor bearing end cover 2 screwed to the other end of the motor case 3.

[0029] A motor input side sealing ring 5 is provided between the motor housing 3 and the motor bearing end cover 2, a first annular groove is provided on the end surface of the motor housing 3 close to the motor bearing end cover 2, and the motor input side sealing ring 5 is embedded in the first annular groove; a motor output side sealing ring 6 is provided between the motor housing 3 and the reducer housing 4, and a second annular groove is provided on the end surface of the motor housing 3 close to the reducer housing 4, and the motor output side sealing ring 6 is embedded in the second annular groove.

[0030] There are four Figure 2 The mounting hole 301 shown in the figure has a motor stator in an interference fit in the mounting hole 301. The outer periphery of the mounting hole 301 is provided with four groups of axial water channels of the same structure (the present application uses one group for structural description). Each group of axial water channels includes a first water channel assembly and a second water channel assembly surrounding the mounting hole 301. The first water channel assembly is as shown in FIG. Figure 3 As shown, it includes a water hole 1 302, a water hole 2 304 and a water hole 305, and the water holes 1 302, the water holes 2 304 and the water holes 305 are respectively and evenly spaced and distributed on the periphery of the mounting hole 301; the second water channel assembly is as shown Figure 3 As shown, it includes water hole 4 306, water hole 5 307, water hole 6 308, water hole 7 309 and middle hole 310 located between two adjacent mounting holes 301. The shapes of water hole 4 306 and water hole 7 309 are symmetrical with respect to the vertical center line of motor housing 3, and the shapes of water hole 5 307 and water hole 6 308 are symmetrical with respect to the vertical center line of motor housing 3. One end of water hole 1 302 to water hole 7 309 and middle hole 310 close to the motor bearing end cover is in an open state, and one end of water hole 1 302 to water hole 7 309 and middle hole 310 reducer housing 4 is a closed surface, and each closed surface is provided with a Figure 2 or Figure 3 In the channel hole 303 shown, the cross-sectional shape of all axial water channels has at least one right angle. Figure 4As shown, the interval d1 between water hole one 302 and water hole two 304, water hole two 304 and water hole three 305 is preferably in the range of 84 mm, the interval d2 between water hole three 305 and water hole four 306, water hole four 306 and water hole five 307, and water hole four 306 and the middle hole 310 in the vertical direction is preferably in the range of 12 mm, and the interval d3 between water hole four 306 and water hole seven 309, water hole three 305 and the middle hole 310 in the horizontal direction is preferably in the range of 16 mm.

[0031] The water hole 1 302 and the water hole 2 304 are connected through the flow groove on the reducer housing 4, and the water hole 2 304 and the water hole 3 305 are connected through the flow groove on the click bearing end cover. The end surface of the reducer housing 4 and the motor housing 3, as well as the end surface of the motor bearing end cover 2 and the motor housing 3 are milled with a plurality of flow grooves. When the motor bearing end cover 2 and the reducer housing 4 are screwed to the two ends of the motor housing 3, the flow groove on the end surface of the reducer housing 4 is connected with the channel hole 303 on the closed surface of the water hole 1 302 to the water hole 7 309 and the middle hole 310, thereby respectively connecting the water hole 1 302 and the water hole 2 304, the water hole 305 and the water hole 4 306, and the water hole 310. Water hole 305, water hole 306, water hole 307 and water hole 308, water hole 309 and the middle hole 310 are connected at one end close to the reducer housing 4, water hole 304, water hole 305, water hole 306 and water hole 5, water hole 307 and water hole 308 and water hole 7, 309 are connected at one end close to the motor bearing end cover 2 through the flow groove on the motor bearing end cover 2, so that water hole 1 302 to water hole 7 309 and the middle hole 310 form a water channel connected in sequence, and a group of axial water channels are arranged on the periphery of the four mounting holes 301. After the four groups of axial water channels are connected again, a complete circulating water channel can be formed, so that the cooling water can flow back and forth in all the axial water channels in an S-shaped path.

[0032] The cooling water circulation path in this structure is as follows: Figure 3In the figure, a and b are respectively the water inlet and the water outlet opened on the side wall of the motor housing 3. The cooling water enters the water hole 1 302 from the water inlet a, and then the cooling water flows axially from the end where the motor bearing end cover 2 is located toward one end of the reducer housing 4, and passes through the channel hole 303 in the water hole 1 302 to enter the flow groove on the end surface of the reducer housing 4 and then flows into the water hole 2 304. Then the cooling water turns back from the end where the reducer housing 4 is located toward the direction of the motor bearing end cover 2, and passes through the motor bearing. The flow groove on the end face of the end cover 2 flows into the water hole three 305, and then flows into the water hole four 306, the water hole five 307, the water hole six 308, the water hole seven 309 and the middle hole 310 in turn, completing the flow of the first set of axial water channels, and then enters the subsequent three sets of axial water channels in turn, flowing back and forth in all axial water channels, taking away the heat of the motor stator in all the mounting holes 301 along the way, and finally flows out from the outlet b and enters the subsequent cooling system, thereby completing the whole cycle.

[0033] The above is only an embodiment of the utility model. The utility model is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. A cooling structure for a reducer, comprising a motor housing, a reducer housing screwed to one end of the motor housing, and a motor bearing end cover screwed to the other end of the motor housing, characterized in that: The motor housing is provided with four mounting holes, in which the motor is fixed, and the outer periphery of the mounting holes is provided with four groups of axial water channels, the axial water channels are not adjacent to each other, and one end of the axial water channel close to the reducer housing is a closed surface, and a channel hole is provided on the closed surface; the reducer housing and the motor bearing end cover are also provided with flow grooves; The four groups of axial water channels form a connected circulating water channel through the circulation grooves and the channel holes.

2. A cooling structure for a reducer according to claim 1, characterized in that: The cross-sectional shape of the axial water channel at the periphery of the mounting hole has at least one right angle.

3. A cooling structure for a reducer according to claim 2, characterized in that: A motor input side sealing ring is detachably connected between the motor housing and the motor bearing end cover.

4. The cooling structure of a reducer according to claim 3, characterized in that: A motor output side sealing ring is detachably connected between the motor housing and the reducer housing.

5. The cooling structure of a reducer according to claim 4, characterized in that: The axial water channel includes a first water channel assembly and a second water channel assembly surrounding the mounting hole, the first water channel assembly includes water hole one, water hole two and water hole three, the water hole one, water hole two and water hole three are evenly distributed on the outer periphery of the mounting hole, water hole one and water hole two are connected through a flow groove on the reducer housing, and water hole two and water hole three are connected through a flow groove on the motor bearing end cover.

6. A cooling structure for a reducer according to claim 5, characterized in that: The second water channel assembly includes water hole four, water hole five, water hole six, water hole seven and a middle hole located between two adjacent mounting holes. The shapes of water hole four and water hole seven are symmetrical relative to the vertical center line of the motor case, and the shapes of water hole five and water hole six are also symmetrical relative to the vertical center line of the motor case. Water hole four and water hole three, water hole five and water hole six, water hole seven and the middle hole are respectively connected through the flow groove on the reducer case; water hole four and water hole five, water hole six and water hole seven are respectively connected through the flow groove on the motor bearing end cover.

7. A cooling structure for a reducer according to claim 6, characterized in that: The spacing range between water hole one and water hole two, water hole two and water hole three is 83.65-84.35mm; the spacing range between water hole three and water hole four, water hole four and water hole five, and water hole four and the middle hole in the vertical direction is 11.82-12.18mm; the spacing range between water hole four and water hole seven, water hole three and the middle hole in the horizontal direction is 15.82-16.18mm.

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