Fixing structure for box body and box cover of reduction gearbox

Abstract

The utility model relates to a gear motor, in particular to a fixing structure for a reduction box body and a box cover of a reduction box of the gear motor. According to the fixing structure for the box body and the box cover of the reduction gearbox, the box body is fixed to a front box cover and a rear box cover through first screws, the front box cover, the rear box cover and the box body are each provided with a plurality of first matching holes which penetrate through and are used for being matched with the first screws, and the front box cover and the box body are further provided with a plurality of second matching holes and a plurality of third matching holes which are matched with each other; a second matching hole is formed in the rear box cover, a second screw is arranged at the second matching hole, a first positioning pin is arranged at the third matching hole, the second screw is shorter than the first screw, a fourth matching hole matched with the rear box cover is formed between the rear box cover and the box body, and a second positioning pin is arranged at the fourth matching hole. According to the utility model, the shearing force when the motor is overloaded can be dispersed, and the connection strength and stability of the reduction gearbox body, the front box cover and the rear box cover can be improved, so that the reliability and the sealing performance when the reduction motor is used can be ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to a reduction motor, specifically to a reduction box body and box cover fixing structure of reduction motor. BACKGROUND

[0002] The Chinese patent with the application number 201922305087.4 discloses a planetary reduction motor, which comprises a motor part and a reduction part. The reduction part comprises a box body constituting an inner gear ring, i.e. front and rear box covers located on both sides of the box body. The box body is provided with a through screw hole. The connection and fixation of the box body and the front and rear box covers of the reduction part are realized through long screws.

[0003] When the motor is overloaded, the long screw may break due to shear stress exceeding the material strength under the action of excessive torque. Even if it is not completely broken, the long screw may loosen or deform due to repeated high stress, resulting in a decrease in the sealing and stability of the connection part. SUMMARY

[0004] The utility model aims to provide a reduction box body and box cover fixing structure which can reduce the shear force on the long screw when the motor is overloaded, thereby ensuring the stability and sealing of the reduction motor in use.

[0005] To achieve the above-mentioned purpose, the utility model adopts a reduction box body and box cover fixing structure. The box body is fixed with the front and rear box covers through first screws. The front and rear box covers and the box body are all provided with a plurality of first matching holes which are through and used for matching the first screws. The front box cover and the box body are also provided with a plurality of second matching holes and a plurality of third matching holes which match with each other. The second matching holes are provided with second screws. The third matching holes are provided with first positioning pins. The length of the second screws is shorter than that of the first screws. The second matching holes on the box body are blind holes. The rear box cover and the box body are provided with fourth matching holes which match with each other. The fourth matching holes are provided with second positioning pins.

[0006] The second matching holes, the third matching holes and the fourth matching holes are set to disperse the shear force of the second screws and the first second positioning pins, reduce the stress of the single first screw, and reduce the shear force of the first screw when the motor is overloaded. The first positioning pins and the second positioning pins are used for pre-positioning the box body and the front and rear box covers. The first second positioning pins are positioned first, then the second screws are assembled, and finally the first screws are assembled, so as to ensure the accurate centering of the box body and the front and rear box covers, guarantee the overall stability of the box body and the front and rear box covers after fixation, and further ensure the reliability and sealing of the motor in use.

[0007] As preferred, at least six first matching holes are arranged in a ring shape and evenly spaced on the box body, the front box cover and the rear box cover, and the second matching hole, the third matching hole and the fourth matching hole are located between two adjacent first matching holes. The ring-shaped and evenly spaced matching holes can uniformly distribute stress and avoid local stress concentration. The symmetrical hole distribution improves the overall symmetry and stability of the structure. Through the uniformly distributed connecting points, the stability of the structure in various directions is ensured.

[0008] As preferred, the cross section of the front box cover is square, and the front box cover is provided with a fixing hole for fixing with the rack of the to-be-linked device at the four corners. The front box cover is provided with a first matching hole on the opposite sides in the first direction and the opposite sides in the second direction, and the first direction is perpendicular to the second direction. A first matching hole is arranged at the middle of the front box cover in the first direction, two first matching holes are arranged at the middle of the front box cover in the second direction, a second matching hole is arranged between the two first matching holes in the second direction, and a blind hole-shaped third matching hole is arranged at the inner end face of the front box cover. The third matching hole is located between the first matching hole on the first direction side of the front box cover and a fixing hole. The first matching hole, the second matching hole and the third matching hole on the front box cover are arranged in a ring shape and are spaced apart with the axis of the front box cover as the center.

[0009] Through the above arrangement, the number of other holes near each hole is set to be smaller in a smaller range of the front box cover, so that the structural strength of the front box cover is ensured, and stress concentration is avoided.

[0010] As preferred, the fourth matching hole on the rear box cover is coaxial with the third matching hole on the front box cover. The symmetrical first positioning pin and the second positioning pin improve the overall symmetry and stability of the structure, and facilitate positioning of the box covers at both ends of the box body through the positioning pins, thereby facilitating assembly.

[0011] As preferred, the box body is provided with a third matching hole and a fourth matching hole on the opposite sides. The above arrangement facilitates machining of both ends of the box body, and only one positioning pin is arranged at each end of the box body. The positioning pin plays a role in positioning the box body and the front and rear box covers, reduces the arrangement of holes and grooves on the box body, and ensures the structural strength.

[0012] As preferred, a gear ring structure is integrally formed on the inner wall of the box body. The gear ring does not need to be fixed with the box body through a fastener, can avoid shaking between the gear ring and the box body, and ensures the stability of the reduction motor during use.

[0013] The utility model has the advantages of dispersing the shear force when the motor is overloaded, improving the connection strength and stability of the reduction box body, the front box cover and the rear box cover, and ensuring the reliability and sealing performance of the reduction motor during use. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 This is a rotated sectional view of the present invention.

[0015] Figure 2 This is another rotating sectional view of the present invention.

[0016] Figure 3 This is a schematic diagram of the structure of the outer end face of the front box cover of this utility model.

[0017] Figure 4 This is a structural schematic diagram of the inner end face of the front box cover of this utility model.

[0018] Figure 5 This is a structural schematic diagram of the inner end face of the rear box cover of this utility model.

[0019] Figure 6 This is a structural schematic diagram of the front end of the box body of this utility model. Detailed Implementation

[0020] The present invention will now be further described with reference to the accompanying drawings and specific embodiments.

[0021] Depend on Figure 1 , Figure 2 and Figure 5 As shown, this embodiment discloses a gearbox housing and cover fixing structure, including a housing 1, a front cover 2, and a rear cover 3. The housing 1 is fixed to the front cover 2 and the rear cover 3 by a first screw 4, which is a long screw. The front cover 2, the rear cover 3, and the housing 1 are all provided with six first mating holes 41 that pass through from front to back and are used to engage with the first screw 4. The six first mating holes 41 on the three components are all arranged in a ring with uniform spacing. Among them, a gear ring structure for engaging planetary gears is integrally formed on the inner wall of the housing 1.

[0022] Depend on Figures 1 to 4 As shown, the front cover 2 and the body 1 are also provided with a second mating hole 51 and a third mating hole 61 that cooperate with each other. A second screw 5 is provided at the second mating hole 51, and a first locating pin 6 is provided at the third mating hole 61. The second screw 5 is a short screw, and the length of the second screw 5 is shorter than the length of the first screw 4. The second mating hole at the body 1 is a blind hole. A fourth mating hole 71 that cooperates with each other is provided between the rear cover 3 and the body 1. A second locating pin 7 is provided at the fourth mating hole 71. Among them, by Figures 3 to 6 As shown, the second mating hole 51, the third mating hole 61 and the fourth mating hole 71 are all located between two adjacent first mating holes 41.

[0023] Depend on Figure 3 and Figure 4As shown, the outer edge of the front cover 1 is square. The four corners of the front cover 1 have fixing holes 10 for fixing to the frame (not shown) of the equipment to be linked. The front cover 1 has first mating holes on both sides along the first direction and on both sides along the second direction. The first direction (vertical direction in the figure) is perpendicular to the second direction (horizontal direction in the figure). A first mating hole 41 is located in the middle of the first direction side of the front cover 1, and two first mating holes 41 are located in the middle of the second direction side of the front cover 1. The six first mating holes 41 on the front cover 1 are arranged in a ring with uniform spacing. A second mating hole 51 is located between the two first mating holes 41 on the second direction side of the front cover 1. In this embodiment, the distance between adjacent holes is relatively large, and the number of holes near each hole is also small, which can avoid poor structural strength of the front cover and the housing; Figure 3 and Figure 4 As shown, the holes in the first direction are spaced apart horizontally, and the holes in the second direction are spaced apart vertically. The third mating hole 61 of the front cover is not located between the axis of the front cover and the corner fixing hole 10, which can better ensure the structural strength.

[0024] Depend on Figure 1 and Figure 2 As shown in the upper part, the third and fourth mating holes on the housing 1 are coaxially arranged, and the fourth mating hole on the rear cover 3 corresponds coaxially to the third mating hole on the front cover 2; Figure 3 and Figure 4 As shown, the housing 1 has a third mating hole 61 and a fourth mating hole 71 on opposite sides. Figure 4 and Figure 5 As shown, a blind hole-shaped third mating hole 61 is provided on the inner end face of the front cover 2. The third mating hole 61 is located between the first mating hole and a fixing hole 10 on the first direction side of the front cover 2. The first mating hole 41, the second mating hole 51 and the third mating hole 61 on the front cover 2 are all arranged in a ring-shaped interval centered on the axis of the front cover 2.

[0025] This embodiment can disperse the shear force when the motor is overloaded, and improve the connection strength and stability between the gearbox housing and the front and rear covers, thereby ensuring the reliability and sealing of the geared motor during use.

Claims

1. A gearbox housing and cover fixing structure, wherein the housing is fixed to a front cover and a rear cover by first screws, and the front cover, the rear cover, and the housing are all provided with a plurality of first mating holes for engaging the first screws, characterized in that: The front cover and the box body are also provided with a number of second mating holes and a number of third mating holes that cooperate with each other. A second screw is provided at the second mating hole, and a first positioning pin is provided at the third mating hole. The length of the second screw is shorter than the length of the first screw. The second mating hole at the box body is a blind hole. A fourth mating hole is provided between the rear cover and the box body that cooperates with each other, and a second positioning pin is provided at the fourth mating hole.

2. The gearbox housing and cover fixing structure according to claim 1, characterized in that: The box body, front cover and rear cover are each provided with at least six annularly spaced first mating holes, and the second mating hole, third mating hole and fourth mating hole are all located between two adjacent first mating holes.

3. The gearbox housing and cover fixing structure according to claim 2, characterized in that: The outer edge of the front cover is square, and the four corners of the front cover are provided with fixing holes for fixing to the frame of the equipment to be linked. The front cover is provided with first mating holes on both sides along the first direction and on both sides along the second direction. The first direction is perpendicular to the second direction. The front cover is provided with a first mating hole in the middle of the first direction side. The front cover is provided with two first mating holes in the middle of the second direction side. A second mating hole is provided between the two first mating holes on the second direction side. The front cover is provided with a blind hole-shaped third mating hole on the inner end face. The third mating hole is located between the first mating hole and a fixing hole on the first direction side of the front cover. The first mating holes, second mating holes and third mating holes on the front cover are all arranged in a ring with the front cover axis as the center.

4. The gearbox housing and cover fixing structure according to claim 3, characterized in that: The fourth mating hole on the rear cover is coaxially corresponding to the third mating hole on the front cover.

5. The gearbox housing and cover fixing structure according to claim 3 or 4, characterized in that: The box body is provided with a third mating hole and a fourth mating hole on opposite sides.

6. The gearbox housing and cover fixing structure according to claim 1, characterized in that: The inner wall of the box is integrally formed with a toothed ring structure.

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