Gearbox transmission gear mounting structure

Abstract

The utility model provides a gearbox transmission gear mounting structure, and belongs to the technical field of machinery. The problem that an existing gearbox affects the service life of a bearing is solved. The gear box comprises a box body, the transmission gear comprises a gear shaft vertically arranged in the box body, the lower end of the gear shaft is a gear part, a through hole allowing the upper end of the gear shaft to extend out is formed in the top of the box body, the installation structure comprises an annular shaft shoulder face formed on the outer wall of the upper end of the gear shaft, and a bearing is clamped between the shaft shoulder face and the top of the box body. The bearing comprises an outer ring and an inner ring, an arc-shaped supporting sleeve is formed on the top wall of the box body, the bearing is sleeved with the supporting sleeve, and the supporting sleeve is in interference fit with the outer ring; the ratio of the arc length of the supporting sleeve to the perimeter of the whole circle where the supporting sleeve is located is larger than 3 / 5, a check block is vertically formed on the top wall of the box body, the check block extends in the radial direction of the supporting sleeve, and one end of the check block is tightly pressed on the outer side face of the outer ring. The gearbox transmission gear mounting structure can accelerate heat dissipation of the bearing.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a gear box, in particular to a transmission gear installation structure of a gear box. Background Art

[0002] Gearbox is an important mechanical transmission device, which is widely used in various mechanical equipment. Its main function is to convert the high-speed rotational motion of the motor or other power source into appropriate speed and torque to drive various mechanical equipment.

[0003] An existing gearbox, such as a gearbox disclosed in the China Patent Library (application number: 202020932028.X), includes a housing, a large gear, a hollow main shaft, a pinion and a pinion shaft. The housing is a rectangular housing, the pinion and its components are arranged on the upper part of the housing, the large gear and its components are arranged on the lower part of the housing, the left tapered roller bearing is arranged in the lower left bearing hole, and the right tapered roller bearing is arranged in the lower right bearing hole. The hollow main shaft is arranged as a hollow structure along the axial direction, the shoulder of the hollow main shaft is positioned by the left tapered roller bearing, the large gear is arranged on the hollow main shaft, and the left end of the large gear is positioned by the shoulder of the hollow main shaft. A sleeve 1 is set at the right end of the big gear for positioning, and the sleeve 1 is positioned by the right tapered roller bearing. An adjusting nut and a locking nut are set at the right end of the hollow main shaft. A flange is set outside the lower left bearing hole, and a large end cover is set outside the lower right bearing hole. A left deep groove ball bearing is set in the upper left bearing hole of the box body, and a right deep groove ball bearing is set in the upper right bearing hole. The pinion shaft is set in the left deep groove ball bearing and the right deep groove ball bearing. The pinion is set on the pinion shaft and meshes with the big gear. The pinion is positioned by sleeves 2 and 3 at both ends. An elastic retaining ring is set at the left end of the pinion shaft for positioning, and the left deep groove ball bearing is positioned by an upper left end cover.

[0004] In the above-mentioned gearbox, the outer side surface of the left deep groove ball bearing is completely attached to the inner wall of the box body for indirect heat dissipation, which affects the heat dissipation speed of the left deep groove ball bearing and thus affects the life of the left deep groove ball bearing. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a gearbox transmission gear installation structure which can accelerate the heat dissipation of the bearing.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a gear box transmission gear installation structure, the gear box includes a box body, the transmission gear includes a gear shaft vertically arranged in the box body, the lower end of the gear shaft is the gear part, and the top of the box body is provided with a through hole for the upper end of the gear shaft to extend out. The installation structure includes a shaft shoulder surface formed on the outer wall of the upper end of the gear shaft and in an annular shape, and a bearing is clamped between the shaft shoulder surface and the top of the box body, and the bearing includes an outer ring and an inner ring fixedly connected to the gear shaft, characterized in that a support sleeve in the shape of an arc is formed on the top wall of the box body, and the support sleeve is coaxially arranged with the gear shaft; the support sleeve is arranged outside the bearing, and an interference fit is formed between the support sleeve and the outer ring; the ratio of the arc length of the support sleeve to the circumference of the whole circle where the support sleeve is located is greater than 3 / 5, and a stopper is also vertically formed on the top wall of the box body, the length of the stopper extends radially along the support sleeve, the stopper and the support sleeve are distributed at intervals along the circumference of the gear shaft, and one end of the stopper is pressed tightly against the outer side surface of the outer ring.

[0007] The support sleeve, whose ratio of arc length to full circumference is greater than 3 / 5, holds the bearing tightly and prevents the bearing from coming out by squeezing it with a block. On the premise of ensuring that the bearing is stably positioned, the block and support sleeve are arranged at circumferential intervals so that the outer ring of the bearing is completely exposed to the outside for direct heat dissipation, thereby effectively accelerating the heat dissipation of the bearing and extending the bearing life.

[0008] In the above-mentioned gearbox transmission gear installation structure, the end face of the above-mentioned stopper in contact with the outer ring is a vertically arranged plane. Under the premise of stable positioning of the bearing, the contact area between the stopper and the outer ring can be reduced, further accelerating the heat dissipation of the bearing.

[0009] In the above-mentioned gearbox transmission gear installation structure, the stopper is a right-angle trapezoidal structure to provide more stable support for the bearing.

[0010] In the above-mentioned gearbox transmission gear installation structure, an arc groove is opened on the inner wall of the support sleeve, and the two ends of the arc groove extend to the two end surfaces of the support sleeve respectively. That is, at this time, both ends of the arc groove are open, so that the outer ring can use the arc groove to make more direct contact with the outside, further accelerating heat dissipation.

[0011] In the above-mentioned gearbox transmission gear installation structure, the cross section of the arc groove is in an arc shape, which ensures the overall strength of the support sleeve.

[0012] In the above-mentioned gearbox transmission gear installation structure, an upper annular step and a lower annular step are continuously distributed from top to bottom on the inner wall of the upper end of the through hole, the bottom surface of the outer ring is pressed tightly against the bottom surface of the upper annular step, and the lower annular step is between the inner ring and the outer ring. The lower annular step is provided to form an escape space under the bearing to further accelerate the heat dissipation of the bearing.

[0013] In the above gearbox transmission gear installation structure, a retaining ring is formed on the top wall of the box body, the retaining ring and the gear shaft are coaxially arranged, and the support sleeve is located inside the retaining ring. The retaining ring plays a certain shielding role and plays a certain protective role on both the bearing and the support sleeve.

[0014] In the above-mentioned gearbox transmission gear installation structure, the outer side surface of the support sleeve is transitionally connected to the top surface of the box body through an arc surface with a circular arc cross-section, which effectively ensures the strength of the support sleeve and provides more stable support for the bearing.

[0015] Compared with the prior art, the gearbox transmission gear installation structure has the following advantages:

[0016] 1. The support sleeve with the ratio of arc length to the whole circumference greater than 3 / 5 holds the bearing tightly and prevents the bearing from coming out by squeezing it with a block. On the premise of ensuring that the bearing is stably positioned, the block and support sleeve are arranged at circumferential intervals so that the outer ring of the bearing is completely exposed to the outside for direct heat dissipation, thereby effectively accelerating the heat dissipation of the bearing and extending the bearing life.

[0017] 2. Set up a lower annular step to form an escape space under the bearing to further accelerate the heat dissipation of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional schematic diagram of the gear box.

[0019] Figure 2 It is a cross-sectional schematic diagram of the gearbox.

[0020] Figure 3 It is a cross-sectional schematic diagram of the box.

[0021] In the figure, 1, housing; 1a, support sleeve; 1a1, arc groove; 1b, stopper; 1c, upper annular step; 1d, lower annular step; 1e, retaining ring; 1f, arc surface; 2, gear shaft; 2a, gear part; 2b, shoulder surface; 3, bearing; 3a, inner ring; 3b, outer ring. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] like Figure 1 and Figure 2 As shown, in the gearbox transmission gear installation structure, the gearbox includes a box body 1, and the transmission gear includes a gear shaft 2 vertically arranged in the box body 1, the lower end of the gear shaft 2 is a gear part 2a, and the top of the box body 1 is provided with a through hole for the upper end of the gear shaft 2 to extend out.

[0024] The transmission gear mounting structure of the gearbox includes an annular shaft shoulder surface 2b formed on the outer wall of the upper end of the gear shaft 2, and the shaft shoulder surface 2b is coaxially arranged with the gear shaft 2. A bearing 3 is clamped between the shaft shoulder surface 2b and the top of the housing 1, and the bearing 3 includes an outer ring 3b and an inner ring 3a fixedly connected to the gear shaft 2, that is, at this time, the lower end of the outer ring 3b is pressed on the top of the housing 1; the upper end of the inner ring 3a is pressed on the shaft shoulder surface 2b.

[0025] like Figures 1 to 3 As shown, a support sleeve 1a in the shape of an arc is integrally formed on the top wall of the housing 1, and the support sleeve 1a is vertically arranged, and the support sleeve 1a is coaxially arranged with the gear shaft 2. The support sleeve 1a is sleeved outside the bearing 3, and an interference fit is formed between the support sleeve 1a and the outer ring 3b. The ratio of the arc length of the support sleeve 1a to the circumference of the whole circle where the support sleeve 1a is located is greater than 3 / 5. A stopper 1b is also vertically formed on the top wall of the housing 1, and the stopper 1b and the housing 1 are an integral structure. The length of the stopper 1b extends radially along the support sleeve 1a, and the stopper 1b and the support sleeve 1a are spaced apart along the circumference of the gear shaft 2, and one end of the stopper 1b is pressed tightly against the outer surface of the outer ring 3b. Preferably, the ratio of the arc length of the support sleeve 1a to the circumference of the whole circle where the support sleeve 1a is located is 3 / 4.

[0026] The support sleeve 1a, whose arc length has a ratio of greater than 3 / 5 to the circumference of the entire circle, holds the bearing 3 tightly and prevents the bearing 3 from coming out by squeezing it through the stopper 1b. On the premise of ensuring that the bearing 3 is stably positioned, the stopper 1b and the support sleeve 1a are arranged to be circumferentially spaced apart, so that the outer ring 3b of the bearing 3 is completely exposed to the outside for direct heat dissipation, thereby effectively accelerating the heat dissipation of the bearing 3 and extending the life of the bearing 3.

[0027] It is further explained that the block 1b is a right-angled trapezoidal structure, and the end face of the block 1b used to contact the outer ring 3b is a vertically arranged plane. Under the premise of stably positioning the bearing 3, the contact area between the block 1b and the outer ring 3b can be reduced, further accelerating the heat dissipation of the bearing 3.

[0028] like Figure 1 and Figure 3 As shown, an arc groove 1a1 is provided on the inner side wall of the support sleeve 1a, and the two ends of the arc groove 1a1 extend to the two end surfaces of the support sleeve 1a, that is, at this time, both ends of the arc groove 1a1 are open, so that the outer ring 3b can use the arc groove 1a1 to make more direct contact with the outside, further accelerating heat dissipation. Preferably, the cross section of the arc groove 1a1 is arc-shaped to ensure the overall strength of the support sleeve 1a.

[0029] In this embodiment, the lower end of the outer ring 3b is supported as follows: Figure 2 and Figure 3As shown, the inner wall of the upper end of the through hole is provided with an upper annular step 1c and a lower annular step 1d which are continuously distributed from top to bottom, and the upper annular step 1c and the lower annular step 1d are both coaxially arranged with the gear shaft 2. Among them, the bottom surface of the outer ring 3b is pressed tightly against the bottom surface of the upper annular step 1c, and the lower annular step 1d is between the inner ring 3a and the outer ring 3b. The lower annular step 1d is arranged to form an escape space under the bearing 3, further accelerating the heat dissipation of the bearing 3.

[0030] In the actual product, a retaining ring 1e is integrally formed on the top wall of the housing 1. The retaining ring 1e and the gear shaft 2 are coaxially arranged, and the support sleeve 1a is located inside the retaining ring 1e. The retaining ring 1e plays a certain shielding role and protects the bearing 3 and the support sleeve 1a. The outer side of the support sleeve 1a is transitionally connected to the top surface of the housing 1 through the arc surface 1f with a circular arc cross section, which effectively ensures the strength of the support sleeve 1a and provides more stable support for the bearing 3.

[0031] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A gearbox transmission gear mounting structure, the gearbox comprising a housing (1), the transmission gear comprising a gear shaft (2) vertically arranged in the housing (1), the lower end of the gear shaft (2) being a gear portion (2a), the top of the housing (1) being provided with a through hole for the upper end of the gear shaft (2) to extend out, the mounting structure comprising an annular shaft shoulder surface (2b) formed on the outer wall of the upper end of the gear shaft (2), and a bearing (3) being clamped between the shaft shoulder surface (2b) and the top of the housing (1), the bearing (3) comprising an outer ring (3b) and an inner ring (3a) fixedly connected to the gear shaft (2), characterized in that: A support sleeve (1a) in the shape of an arc is formed on the top wall of the housing (1), and the support sleeve (1a) is coaxially arranged with the gear shaft (2); the support sleeve (1a) is sleeved outside the bearing (3), and an interference fit is formed between the support sleeve (1a) and the outer ring (3b); the ratio of the arc length of the support sleeve (1a) to the circumference of the whole circle where the support sleeve (1a) is located is greater than 3 / 5; a stopper (1b) is also vertically formed on the top wall of the housing (1), the length of the stopper (1b) extending radially along the support sleeve (1a), the stopper (1b) and the support sleeve (1a) are spaced apart circumferentially along the gear shaft (2), and one end of the stopper (1b) is tightly pressed against the outer surface of the outer ring (3b).

2. The gearbox transmission gear installation structure according to claim 1, characterized in that: The end surface of the stopper (1b) in contact with the outer ring (3b) is a vertically arranged plane.

3. The gearbox transmission gear installation structure according to claim 2, characterized in that: The stopper (1b) is a right-angled trapezoidal structure.

4. The gearbox transmission gear mounting structure according to claim 1, 2 or 3, characterized in that: An arc groove (1a1) is provided on the inner side wall of the support sleeve (1a), and two ends of the arc groove (1a1) respectively extend to the two end surfaces of the support sleeve (1a).

5. The gearbox transmission gear installation structure according to claim 4, characterized in that: The cross section of the arc groove (1a1) is in the shape of an arc.

6. The gearbox transmission gear installation structure according to claim 1, characterized in that: An upper annular step (1c) and a lower annular step (1d) are provided on the inner wall of the upper end of the through hole and are continuously distributed from top to bottom. The bottom surface of the outer ring (3b) is tightly pressed against the bottom surface of the upper annular step (1c), and the lower annular step (1d) is located between the inner ring (3a) and the outer ring (3b).

7. The gearbox transmission gear installation structure according to claim 1, characterized in that: A retaining ring (1e) is also formed on the top wall of the box body (1), the retaining ring (1e) and the gear shaft (2) are coaxially arranged, and the support sleeve (1a) is located on the inner side of the retaining ring (1e).

8. The gearbox transmission gear installation structure according to claim 1, characterized in that: The outer side surface of the support sleeve (1a) is transitionally connected to the top surface of the box body (1) via an arc surface (1f) having an arc-shaped cross section.

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