Pulley gear shaft assembly for gear box

Abstract

The utility model provides a pulley and gear shaft assembly for a gear box, belonging to the field of mechanical technology. It solves the problem that it is inconvenient to disassemble and assemble the pulley in the existing assembly. In the utility model, the gear box includes a box body, the assembly includes a pulley and a gear shaft arranged in the box body, the front end of the gear shaft is rotatably supported on the box body through a front bearing, the box body is provided with a through hole for the front end of the gear shaft to extend, the pulley is composed of a connecting pipe and an annular pulley part formed outside the connecting pipe, the front bearing includes an inner ring, the connecting pipe is sleeved on the front end of the gear shaft and the two are matched by splines; an annular limiting piece is fixed on the gear shaft, the front end of the connecting pipe passes through the through hole and is pressed on the front end face of the inner ring, and the rear end face of the inner ring is pressed on the limiting piece; a conical surface 1 is also formed on the outer wall of the gear shaft, and a conical surface 2 is formed on the inner wall of the rear end of the connecting pipe, and the conical surface 1 and the conical surface 2 are tightly attached; an annular locking piece is also sleeved and detachably fixed outside the front end of the gear shaft, and the front end face of the connecting pipe is pressed on the locking piece. The utility model facilitates the disassembly and assembly of the pulley.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a gear box, in particular to a belt pulley gear shaft assembly for the gear box. Background Art

[0002] A gearbox is a closed gear train or mechanical unit consisting of a series of integrated gears and is widely used in various mechanical equipment.

[0003] The pulley gear shaft assembly is a component of a certain type of gearbox, and its structure is as disclosed in the China Patent Library as a pulley transmission shaft assembly (application number: 201710271492.1), which includes a long shaft, one end of the long shaft is a power input end, and the other end of the long shaft is a power output end. The power input end of the long shaft is connected to the spline sleeve of the power output end of the diesel engine through an external spline 1, and the power output end of the long shaft is connected to the spline sleeve of the power input end of the road repair machine through an external spline 2. The pulley transmission shaft assembly also includes a connecting sleeve, a first bearing, a shaft elastic retaining ring, a hole elastic retaining ring, a first pulley sleeve and a second pulley sleeve; the long shaft is composed of a first shaft section to a ninth shaft section in sequence from its output end to its input end, a first pulley sleeve is detachably mounted on the fourth shaft section of the long shaft, a first bearing is mounted on the sixth shaft section of the long shaft, and the first bearing is mounted on the second shaft section. In the pulley sleeve, an annular groove 1 is provided on the outer circumferential surface of the sixth section of the long shaft, and an annular groove 2 is provided on the inner circumferential surface of the second pulley sleeve. An elastic circlip for the shaft is installed in the annular groove 1, and an elastic circlip for the hole is installed in the annular groove 2. The first bearing is axially limited by the elastic circlip for the shaft, the elastic circlip for the hole, the inner shoulder end face of the second pulley sleeve and the shoulder between the sixth section of the shaft and the seventh section of the shaft of the long shaft. An external spline 3 is provided on the outer circumferential surface of the seventh section of the shaft of the long shaft, and an inner circumferential surface of the connecting sleeve is provided with an internal spline 1, and an external spline 4 is provided on the outer circumferential surface of the connecting sleeve. An internal spline 2 is provided on the inner circumferential surface of the second pulley sleeve. The external spline 3 of the seventh section of the long shaft cooperates with an internal spline 1 of the connecting sleeve, and an external spline 4 of the connecting sleeve cooperates with an internal spline 2 of the second pulley sleeve. An annular wrench is provided at the end of the outer circumferential surface of the connecting sleeve adjacent to the eighth section of the shaft of the long shaft.

[0004] In the above-mentioned pulley transmission shaft assembly, the second pulley sleeve is rotatably set on the long shaft by means of the first bearing. When the assembly is applied to the gear box and the second pulley sleeve needs to be replaced, the gear box body needs to be disassembled and the second pulley sleeve needs to be heated to expand it and separate from the first bearing. The whole operation steps are relatively large, making it inconvenient to disassemble and assemble the second pulley. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a pulley gear shaft assembly for a gear box which is convenient for pulley replacement.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a pulley and gear shaft assembly for a gear box, the gear box includes a box body, the pulley and gear shaft assembly includes a pulley and a gear shaft horizontally arranged in the box body, a gear is formed at the rear end of the gear shaft, the front end of the gear shaft is rotatably supported on the box body through a front bearing, and the box body is provided with a through hole for the front end of the gear shaft to extend out, the pulley is outside the box body, and the pulley is composed of a connecting pipe and an annular pulley part formed outside the connecting pipe, the front bearing includes an outer ring and an inner ring respectively fixed to the box body and the gear shaft, and is characterized in that the connecting pipe is sleeved on the gear shaft The front end and the two are connected by spline cooperation; an annular limit piece is coaxially fixed on the gear shaft, the front end of the connecting tube passes through the through hole and is pressed on the front end face of the inner ring, and the rear end face of the inner ring is pressed on the limit piece; a conical surface one is also formed on the outer wall of the gear shaft, and the conical surface one is located between the front bearing and the above-mentioned spline; the diameter of the conical surface one gradually increases from front to back, and a conical surface two matching the conical surface one is formed on the inner wall at the rear end of the connecting tube, and the conical surface one and the conical surface two are tightly attached to each other; an annular locking piece is also sleeved on the outside of the front end of the gear shaft and can be detachably fixed, and the front end face of the connecting tube is tightly pressed against the rear end face of the locking piece.

[0007] The connecting tube is clamped and positioned between the locking piece and the inner ring of the front bearing to achieve axial limitation of the pulley, and with the cooperation of the spline and the first and second cone surfaces, the circumferential and radial limitations of the pulley are achieved, so that the gear shaft can stably drive the pulley to output power.

[0008] The belt pulley replacement method is as follows: remove the locking piece, pull out the belt pulley, then insert a new belt pulley, and reinstall the locking piece. In other words, the present application only needs to disassemble the locking piece and insert and remove the belt pulley to realize the belt pulley disassembly and assembly. The whole process has very few steps and there is no need to disassemble the box body, which has the advantages of easy use and labor saving.

[0009] At the same time, the spline fit and the fit of cone surface one and cone surface two are distributed along the axial direction of the gear shaft, which can not only enhance the coaxiality of the gear shaft and the pulley, but also make the pulley hold the gear shaft tightly to prevent radial shaking, thereby effectively enhancing the transmission stability and accuracy of the two.

[0010] In the above-mentioned pulley gear shaft assembly for the gear box, the above-mentioned limiting member is a clamp, and the clamp clamps the above-mentioned gear shaft. The above-mentioned design can effectively reduce the difficulty of processing and assembling the gear shaft and the front bearing.

[0011] As another solution, in the above-mentioned pulley gear shaft assembly for the gear box, an annular groove is provided on the outer wall of the gear shaft, and the limiting member is a shaft retaining ring installed in the annular groove.

[0012] In the above-mentioned pulley gear shaft assembly for the gear box, the locking member includes a nut threaded on the front end of the gear shaft and an annular gasket sleeved on the front end of the gear shaft, and the two end surfaces of the annular gasket are respectively pressed tightly on the nut and the connecting pipe, which has the advantages of simple structure and easy installation.

[0013] As another solution, in the above-mentioned pulley gear shaft assembly for the gear box, the locking member includes a positioning sleeve sleeved on the front end of the gear shaft, the positioning sleeve has a through hole radially extending therethrough, a corresponding threaded hole is provided on the gear shaft, and the positioning sleeve is fixedly connected to the gear shaft by a screw passing through the through hole through a rod and screwed into the threaded hole.

[0014] In the above-mentioned pulley gear shaft assembly for the gear box, a circular hole is radially penetrated on the gear shaft, and a cylindrical pin matching the circular hole is embedded in the circular hole; a circle of notches is radially penetrated on the front end side wall of the nut, and the number of notches is an even number, and the shape and size of the notches match the cylindrical pin, and both ends of the cylindrical pin extend out of the circular hole and are respectively stuck in two of the notches. With the cooperation of the cylindrical pin and the notch, the rotation of the nut can be restricted to prevent it from loosening, ensuring that the pulley and the gear shaft always maintain a stable connection.

[0015] In the above-mentioned pulley gear shaft assembly for the gear box, the connecting pipe forms a seal with the inner wall of the through hole through the annular oil seal to prevent impurities such as dust from entering the box body.

[0016] In the above-mentioned pulley and gear shaft assembly for the gear box, the pulley is a cast integral part.

[0017] Compared with the prior art, the pulley and gear shaft assembly for the gear box has the following advantages:

[0018] 1. The present invention can realize the disassembly and assembly of the pulley only by disassembling and assembling the locking part and plugging and unplugging the pulley. The whole process has very few steps and there is no need to disassemble the box body. It has the advantages of easy use and labor saving.

[0019] 2. The spline fit and the fit of cone surface 1 and cone surface 2 are arranged along the axial distribution of the gear shaft, which can not only enhance the coaxiality of the gear shaft and the pulley, but also make the pulley hold the gear shaft tightly to prevent radial shaking, thereby effectively enhancing the transmission stability and accuracy of the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional schematic diagram of the pulley gear shaft assembly.

[0021] Figure 2 It is a cross-sectional schematic diagram of the pulley gear shaft assembly.

[0022] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0023] Figure 4 It is a cross-sectional schematic diagram of the gearbox.

[0024] In the figure, 1, housing; 2, pulley; 2a, connecting pipe; 2b, annular pulley part; 3, gear shaft; 3a, gear; 3b, cone surface 1; 4, front bearing; 4a, inner ring; 5, limiter; 6, nut; 6a, notch; 7, annular gasket; 8, cylindrical pin; 9, annular oil seal. DETAILED DESCRIPTION

[0025] 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. Embodiment 1

[0026] like Figure 4 As shown, the gearbox includes a housing 1; the pulley and gear shaft assembly for the gearbox includes a pulley 2 and a gear shaft 3 horizontally arranged in the housing 1. The front end of the gear shaft 3 is rotatably supported on the housing 1 through a front bearing 4, and the rear end of the gear shaft 3 is rotatably supported on the housing 1 through a rear bearing. In actual products, the front bearing 4 and the rear bearing are both ball bearings, and the front bearing 4 includes an outer ring and an inner ring 4a fixedly connected to the housing 1 and the gear shaft 3, respectively.

[0027] Specifically,

[0028] A gear 3a is coaxially formed at the rear end of the gear shaft 3, and the rear bearing is located between the front bearing 4 and the gear 3a. A through hole is provided on the housing 1 for the front end of the gear shaft 3 to extend out. In the actual product, the gear shaft 3 is an integrated structure.

[0029] like Figures 1 to 3 As shown, the pulley 2 is outside the housing 1, and the pulley 2 is composed of a connecting tube 2a and an annular pulley portion 2b formed outside the connecting tube 2a. Preferably, the pulley 2 is a cast integral part. Among them, the connecting tube 2a is sleeved on the front end of the gear shaft 3 and the two are connected by spline matching. A ring-shaped limiter 5 is also coaxially fixed on the gear shaft 3. The front end of the connecting tube 2a passes through the through hole and is pressed on the front end surface of the inner ring 4a, and the rear end surface of the inner ring 4a is pressed on the limiter 5 for axial limiting of the bearing. A conical surface 1 3b is also formed on the outer wall of the gear shaft 3, and the conical surface 1 3b is between the front bearing 4 and the above-mentioned spline. The diameter of the conical surface 1 3b gradually increases from front to back, and a conical surface 2 matching the conical surface 1 3b is formed on the inner wall of the rear end of the connecting tube 2a, and the conical surface 1 3b and the conical surface 2 are tightly attached. A ring-shaped locking piece is also sleeved and detachably fixed outside the front end of the gear shaft 3, and the front end surface of the connecting tube 2a is tightly pressed on the rear end surface of the locking piece.

[0030] The connecting tube 2a is clamped and positioned between the locking piece and the inner ring 4a of the front bearing 4 to achieve axial limitation of the pulley 2, and with the cooperation of the spline and the cone surface 3b and the cone surface 2, the circumferential and radial limitation of the pulley 2 is achieved, so that the gear shaft 3 can stably drive the pulley 2 to output power.

[0031] The belt pulley 2 can be replaced by removing the locking piece, pulling out the belt pulley 2, inserting a new belt pulley 2, and reinstalling the locking piece. In other words, the present invention only requires disassembling the locking piece and plugging and unplugging the belt pulley 2 to realize the disassembly and assembly of the belt pulley 2. The whole process has very few steps, and there is no need to disassemble the box body 1, which has the advantages of being easy to use and labor-saving.

[0032] At the same time, the spline fit and the cone surface 1 3b and the cone surface 2 are arranged to be distributed axially along the gear shaft 3, which can not only enhance the coaxiality of the gear shaft 3 and the pulley 2, but also enable the pulley 2 to hold the gear shaft 3 tightly to prevent radial shaking, thereby effectively enhancing the transmission stability and accuracy of the two.

[0033] Preferably, the front side of the second conical surface extends to the spline connection, and the rear side of the second conical surface extends to the rear end surface of the connecting pipe 2a.

[0034] In this embodiment,

[0035] The limiting member 5 is a clamp, and the clamp clamps the gear shaft 3. The above design can effectively reduce the difficulty of processing and assembling the gear shaft 3 and the front bearing 4. Among them, the structure and installation method of the clamp are both existing and will not be described in detail here.

[0036] like Figure 1 , Figure 2 and Figure 4 As shown, the locking member includes a nut 6 threaded on the front end of the gear shaft 3 and an annular gasket 7 sleeved on the front end of the gear shaft 3, and the two end surfaces of the annular gasket 7 are respectively pressed against the nut 6 and the connecting pipe 2a. Further explanation, a circular hole is radially penetrated on the gear shaft 3, and a cylindrical pin 8 matching the circular hole is embedded in the circular hole. A circle of notches 6a is radially penetrated on the side wall of the front end of the nut 6, and the number of notches 6a is an even number. The shape and size of the notches 6a are matched with the cylindrical pin 8, and both ends of the cylindrical pin 8 extend out of the circular hole and are respectively stuck in two of the notches 6a. With the cooperation of the cylindrical pin 8 and the notch 6a, the rotation of the nut 6 can be limited to prevent it from loosening, ensuring that the pulley 2 and the gear shaft 3 always maintain a stable connection.

[0037] In actual products, the connecting pipe 2 a forms a seal with the inner wall of the through hole through the annular oil seal 9 to prevent impurities such as dust from entering the box body 1 . Embodiment 2

[0038] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that an annular groove is provided on the outer wall of the gear shaft 3, and the limiting member 5 is a shaft retaining ring installed in the annular groove. Embodiment 3

[0039] The structure and principle of the third embodiment are basically the same as those of the first embodiment, except that the locking member includes a positioning sleeve sleeved on the front end of the gear shaft 3, the positioning sleeve is radially penetrated by a through hole, the gear shaft 3 is correspondingly provided with a threaded hole, and the positioning sleeve is fixedly connected to the gear shaft 3 by a screw passing through the through hole through the rod and screwed into the threaded hole.

[0040] 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 pulley and gear shaft assembly for a gear box, the gear box comprising a housing (1), the pulley and gear shaft assembly comprising a pulley (2) and a gear shaft (3) horizontally arranged in the housing (1), a gear (3a) being formed at the rear end of the gear shaft (3), a front end of the gear shaft (3) being rotatably supported on the housing (1) through a front bearing (4), and a through hole through which the front end of the gear shaft (3) extends out is provided on the housing (1), the pulley (2) is outside the housing (1), and the pulley (2) is composed of a connecting tube (2a) and an annular pulley portion (2b) formed outside the connecting tube (2a), the front bearing (4) comprising an outer ring and an inner ring (4a) respectively connected to the housing (1) and the gear shaft (3), characterized in that: The connecting tube (2a) is sleeved on the front end of the gear shaft (3) and the two are connected by spline matching; an annular limiting member (5) is coaxially fixed on the gear shaft (3); the front end of the connecting tube (2a) passes through the through hole and is pressed on the front end surface of the inner ring (4a), and the rear end surface of the inner ring (4a) is pressed on the limiting member (5); a conical surface 1 (3b) is formed on the outer wall of the gear shaft (3), and the conical surface 1 (3b) is located between the front bearing (4) and the above-mentioned spline; the diameter of the conical surface 1 (3b) gradually increases from front to back, and a conical surface 2 matching the conical surface 1 (3b) is formed on the inner wall of the rear end of the connecting tube (2a), and the conical surface 1 (3b) and the conical surface 2 are tightly abutted; an annular locking member is sleeved and detachably fixed on the outside of the front end of the gear shaft (3), and the front end surface of the connecting tube (2a) is tightly pressed on the rear end surface of the locking member.

2. The pulley and gear shaft assembly for a gear box according to claim 1, characterized in that: The above-mentioned limiting member (5) is a clamp, and the clamp clamps the above-mentioned gear shaft (3).

3. The pulley and gear shaft assembly for a gear box according to claim 1, characterized in that: An annular groove is provided on the outer wall of the gear shaft (3), and the limiting member (5) is a shaft retaining ring installed in the annular groove.

4. The pulley and gear shaft assembly for a gear box according to claim 1, characterized in that: The locking member comprises a nut (6) threadedly connected to the front end of the gear shaft (3) and an annular gasket (7) sleeved on the front end of the gear shaft (3), and both end surfaces of the annular gasket (7) are respectively pressed tightly against the nut (6) and the connecting pipe (2a).

5. The pulley and gear shaft assembly for a gear box according to claim 4, characterized in that: The locking member comprises a positioning sleeve sleeved on the front end of the gear shaft (3), the positioning sleeve having a through hole radially extending therethrough, the gear shaft (3) having a corresponding threaded hole, and the positioning sleeve being fixedly connected to the gear shaft (3) by means of a screw having a rod passing through the through hole and screwed into the threaded hole.

6. The pulley and gear shaft assembly for a gear box according to claim 4, characterized in that: A circular hole is radially penetrated on the gear shaft (3), and a cylindrical pin (8) matching the circular hole is embedded in the circular hole; a circle of notches (6a) is radially penetrated on the front end side wall of the nut (6), the number of the notches (6a) is an even number, the shape and size of the notches (6a) are matched with the cylindrical pin (8), and both ends of the cylindrical pin (8) extend out of the circular hole and are respectively clamped in two of the notches (6a).

7. The pulley and gear shaft assembly for a gear box according to claim 1, characterized in that: The connecting pipe (2a) forms a seal with the inner wall of the through hole through the annular oil seal (9).

8. The pulley and gear shaft assembly for a gear box according to claim 1, characterized in that: The pulley (2) is a cast one-piece part.

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