CN220956629U - Output shaft double-bearing support power takeoff for crane - Google Patents

Abstract

The application relates to an output shaft double-bearing support power takeoff for a crane, which belongs to the technical field of engineering machinery gear transmission and comprises the following components: the base is used for being connected with the gearbox; the shell is fixedly connected to the base and is internally provided with a cavity; the gear shaft part is positioned in the shell and is rotationally connected with the shell, and one end of the gear shaft positioned outside the shell is used for being connected with the transmission shaft; the input assembly is used for receiving power of a middle shaft of the gearbox and controlling power transmission or disconnection of the gear shaft; the first bearing, the second bearing and the third bearing are arranged on the base, the second bearing and the third bearing are arranged on the shell and are close to the output end of the gear shaft, and the first bearing, the second bearing and the inner ring of the third bearing are sleeved on the gear shaft; the radial support strength of the output end of the gear shaft is improved, and the output end bearing and the shaft seal are protected.

Description

Output shaft double-bearing support power takeoff for crane

Technical Field

The utility model relates to the technical field of engineering machinery gear transmission, in particular to an output shaft double-bearing support power takeoff for a crane.

Background

The automobile crane is one kind of crane installed on common automobile chassis or special automobile chassis and has hydraulic system comprising hydraulic pump, motor, hydraulic valve, hydraulic pipeline, joint, hydraulic oil tank and other hydraulic components.

At present, most of hydraulic pumps are driven by a transmission shaft which is connected with a gearbox and is output by a power takeoff end, power of the gearbox is transmitted to the power takeoff, and power is transmitted to the hydraulic pumps by an output shaft of the power takeoff through the transmission shaft, so that the hydraulic pumps are driven to continuously work.

Because of the arrangement limitation of other parts of the whole vehicle, the connecting distance between the hydraulic pump and the power takeoff of the gearbox is longer, so that the connecting transmission shaft is longer and has a certain included angle; the transmission shafts cannot be supported by a shaft supporting seat, and can be connected in a suspension manner only through one transmission shaft; because the automobile crane has high flexibility and high transfer speed, jolts and vibration are also more severe on a bad road, the front and rear ends of the output gear shaft of the current gearbox power takeoff are supported by a pair of deep groove ball bearings or a pair of tapered roller bearings, and the radial support rigidity of the output end of the output gear shaft is insufficient due to the reasons, so that the radial deformation of the output end bearing is easy to occur.

Disclosure of utility model

The utility model provides an output shaft double-bearing support power takeoff for a crane.

The technical scheme adopted for solving the technical problems is as follows: an output shaft double bearing support power takeoff for a crane, comprising:

the base is used for being connected with the gearbox;

The shell is fixedly connected to the base, and a cavity is formed in the shell;

The gear shaft is partially positioned in the shell and is rotationally connected with the shell, and one end of the gear shaft positioned outside the shell is used for being connected with the transmission shaft;

The input assembly is used for receiving power of a middle shaft of the gearbox and controlling power transmission or disconnection of the gear shaft; and

The first bearing, the second bearing and the third bearing are arranged on the base, the second bearing and the third bearing are arranged on the shell and are close to the output end of the gear shaft, and the inner rings of the first bearing, the second bearing and the third bearing are sleeved on the gear shaft.

The outer ring part of the second bearing is embedded in the shell;

The third bearing is located one side of the second bearing, which is away from the first bearing, the outer wall of the shell is provided with a bearing seat, the bearing seat is sleeved outside one end of the gear shaft, which extends out of the shell, the outer ring part of the third bearing is embedded into the bearing seat, one end of the gear shaft, which is located outside the shell, is provided with a flange, and the flange abuts against the inner ring of the third bearing.

And a first check ring is arranged between the second bearing and the third bearing, and is sleeved on the gear shaft and props against the inner rings of the second bearing and the third bearing.

The third bearing outer diameter is smaller than the second bearing outer diameter.

The first bearing and the second bearing are cylindrical roller bearings, and the third bearing is a deep groove ball bearing.

The flange is characterized in that a sealing assembly is arranged between the bearing seat and the flange, a protective cover for covering the sealing assembly is fixed on the bearing seat, the protective cover is sleeved outside the flange, one end of the protective cover, far away from the bearing seat, extends along the axial direction of the flange and is in clearance fit with the outer circumferential surface of the gear shaft, and the protective cover is provided with a spiral groove along the inner wall of the extending section of the flange.

The sealing assembly comprises a shaft seal, the inner ring of the shaft seal is sleeved on the flange, and the outer ring of the shaft seal is fixed with the inner wall of the bearing seat.

The shaft seal is provided with at least two.

The section of the spiral groove is triangular, trapezoid or rectangle.

The input assembly comprises an input shaft, an input gear, a joint gear sleeve and a shifting fork, wherein the input shaft is rotationally connected in a shell and used for transmitting power output by a gearbox, the input gear is sleeved on the input shaft and rotationally connected with the input shaft, the input gear is meshed with a gear shaft, the joint gear sleeve is sleeved on the input gear and is in spline connection with the input gear, and spline teeth are arranged on the joint gear sleeve and the input shaft;

The shifting fork is arranged on the joint gear sleeve and used for driving the joint gear sleeve to reciprocate along the axial direction of the input gear, so that the joint gear sleeve is meshed with or separated from spline teeth of the input shaft.

Through the technical scheme, compared with the prior art, the utility model has the following beneficial effects:

1. The radial rigidity of the gear shaft at the output end is increased through the double support of the second bearing and the third bearing to the output end of the gear shaft, so that the gear shaft keeps stable rotation, the bearing of the shaft seal and the gear shaft are uniformly and stably stressed, and the protection effect on each bearing and the shaft seal is achieved;

2. The outer ring of the third bearing is limited through the bearing seat, and the first retainer ring and the flange plate limit the inner ring of the third bearing, so that the position of the third bearing is fixed, and the possibility of axial movement of the third bearing is reduced;

3. The gear shaft is matched with the spiral groove to generate spiral thrust when rotating at a high speed, so that earth, sand and dust possibly invaded between the protective cover and the flange plate are discharged outwards, the shaft seal is protected, the surface of the gear shaft is kept clean, and the occurrence of rust on the surface of the gear shaft is reduced.

Drawings

The utility model will be further described with reference to the drawings and examples.

FIG. 1 is a schematic view of the overall structure of the present utility model;

Fig. 2 is a schematic diagram of the present utility model for embodying a shield and a helical groove.

In the figure: 1. a base; 2. an input assembly; 3. a housing; 2-1, a shifting fork; 2-2, engaging the gear sleeve; 2-3, an input shaft; 2-4, an input gear; 4-1, a first bearing; 4-2, gear shaft; 4-3, a second bearing; 4-4, a third bearing; 4-5, bearing seat; 4-6, a first check ring; 4-7, a flange plate; 4-8, shaft seal; 4-9, a protective cover; 4-9-1, spiral groove; 5. spline teeth.

Detailed Description

The utility model will now be described in further detail with reference to the accompanying drawings. In the description of the present utility model, it should be understood that the terms "left", "right", "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and "first", "second", etc. do not indicate the importance of the components, and thus are not to be construed as limiting the present utility model. The specific dimensions adopted in the present embodiment are only for illustrating the technical solution, and do not limit the protection scope of the present utility model.

As shown in FIG. 1, the output shaft double-bearing support power takeoff for the crane comprises a base 1, a shell 3, a gear shaft 4-2, a first bearing 4-1, a second bearing 4-3, a third bearing 4-4 and an input assembly 2.

The base 1 is used for being fixed on the gearbox, the casing 3 is fixedly connected with the base 1, a cavity is formed in the casing 3, a gear shaft 4-2 part is located in the casing 3, the other part penetrates out of the casing 3, one penetrating end is coaxially provided with a flange 4-7, the flange 4-7 is used for being connected with a transmission shaft to output power, and a hole for the gear shaft 4-2 to penetrate out is formed in the casing 3.

As shown in FIG. 1, a first bearing 4-1 is mounted on a base 1, a second bearing 4-3 and a third bearing 4-4 are mounted on a shell 3 and are arranged near the output end of a gear shaft 4-2, the third bearing 4-4 is positioned on one side of the second bearing 4-3, which is away from the first bearing 4-1, the outer diameter of the third bearing 4-4 is smaller than that of the second bearing 4-3, a gear on the gear shaft 4-2 is positioned between the first bearing 4-1 and the second bearing 4-3, the first bearing 4-1, the second bearing 4-3 and the inner ring of the third bearing 4-4 are sleeved on the gear shaft 4-2, the gear shaft 4-2 is supported, and the rotational connection of the gear shaft 4-2 and the base 1 and the shell 3 is realized. The first bearing 4-1 and the second bearing 4-3 are cylindrical roller bearings, the radial bearing capacity of the cylindrical roller bearings is high, the cylindrical roller bearings are suitable for bearing heavy loads and impact loads, the third bearing 4-4 is a deep groove ball bearing, and the deep groove ball bearing is mainly used for bearing radial loads, but can bear radial and axial combined loads when the radial play of the bearings is increased. The second bearing 4-3 and the third bearing 4-4 may be separate bearings or may be integrated double row roller bearings.

The gear shaft 4-2 is provided with shaft shoulders on two sides of the gear, the base 1 is provided with a hole for the outer ring part of the first bearing 4-1 to be embedded, and the inner ring of the first bearing 4-1 is axially limited by the shaft shoulders on the gear shaft 4-2 on one side of the gear towards the gear shaft 4-2.

The shell 3 is provided with a hole in which the outer ring part of the second bearing 4-3 is embedded, and one side of the inner ring of the second bearing 4-3 facing the first bearing 4-1 is axially limited through a shaft shoulder on the gear shaft 4-2.

As shown in FIG. 1, a first retainer ring 4-6 is sleeved on the gear shaft 4-2, the first retainer ring 4-6 is positioned between the second bearing 4-3 and the third bearing 4-4 and is propped against the inner rings of the second bearing 4-3 and the third bearing 4-4, a bearing seat 4-5 is arranged on the outer wall of the shell 3, the bearing seat 4-5 is sleeved outside one end of the gear shaft 4-2 extending out of the shell 3, the outer ring part of the third bearing 4-4 is matched with the inner wall of a hole in the shell 3 for the gear shaft 4-2 to penetrate, the other part of the outer ring part is embedded in the bearing seat 4-5, and a hole matched with the outer ring of the third bearing 4-4 is formed in the bearing seat 4-5. The flange 4-7 is partially sleeved on the gear shaft 4-2, the end of the flange abuts against the inner ring of the third bearing 4-4, and the third bearing 4-4 is axially limited by the first retainer ring 4-6, the flange 4-7 and the bearing seat 4-5.

As shown in fig. 1 and 2, a sealing component is arranged between a bearing seat 4-5 and a flange 4-7, a protective cover 4-9 for covering the sealing component is fixed on the bearing seat 4-5, the protective cover 4-9 is sleeved outside the flange 4-7, one end of the protective cover 4-9 far away from the bearing seat 4-5 extends along the flange 4-7 axially and is in clearance fit with the outer circumferential surface of a gear shaft 4-2, a spiral groove 4-9-1 is formed in the protective cover 4-9 along the inner wall of the extending section of the flange 4-7, and the cross section of the spiral groove 4-9-1 is triangular or trapezoidal or rectangular.

The sealing assembly comprises shaft seals 4-8, the shaft seals 4-8 are at least provided with two and are axially arranged along the flange 4-7, the inner rings of the two shaft seals 4-8 are sleeved on the flange 4-7 and can rotate relative to the flange 4-7, and the outer rings of the two shaft seals 4-8 are fixed with the inner wall of the bearing seat 4-5. When the gear shaft 4-2 rotates, the gear shaft 4-2 drives the flange 4-7 to rotate, the inner ring of the shaft seal 4-8 abuts against the outer circumferential surface of the flange 4-7, foreign matters such as external dust and water are prevented from entering, and the protection effect on each bearing inside is achieved. Simultaneously, the rotating flange 4-7 generates air flow to the outer side of one end of the protective cover 4-9 away from the bearing seat 4-5 under the cooperation of the spiral groove 4-9-1, and under the action of the air flow, on one hand, external sundries can be prevented from entering, on the other hand, sundries between the protective cover 4-9 and the flange 4-7 can be discharged, and the protection effect on the surface of the gear shaft 4-2 and the shaft seal 4-8 is achieved.

The input assembly 2 comprises an input shaft 2-3, an input gear 2-4, a joint gear sleeve 2-2 and a shifting fork 2-1, wherein the input shaft 2-3 is rotatably connected in the shell 3 and is used for being connected with an output shaft of the gearbox to transmit power output by the gearbox. The input gear 2-4 is sleeved on the input shaft 2-3 and is rotationally connected with the input shaft 2-3, the input gear 2-4 is kept in constant engagement with the gear shaft 4-2, the joint gear sleeve 2-2 is sleeved on the input gear 2-4 and is in spline connection with the input gear 2-4, namely, an inner spline is arranged on the inner side of the joint gear sleeve 2-2, an outer spline is arranged on the outer circumferential surface of the input gear 2-4, and the inner spline teeth 5 are meshed, so that the joint gear sleeve 2-2 can axially move along the input gear 2-4 and drive the input gear 2-4 to rotate.

The joint gear sleeve 2-2 and the input shaft 2-3 are respectively provided with spline teeth 5, and the tooth shape of the spline teeth 5 is the same as that of the spline teeth 5 between the joint gear sleeve 2-2 and the input gear 2-4.

The shifting fork 2-1 is arranged on the engaging tooth sleeve 2-2 and is used for driving the engaging tooth sleeve 2-2 to axially reciprocate along the input gear 2-4 so that the engaging tooth sleeve 2-2 is meshed with or separated from the spline teeth 5 of the input shaft 2-3.

The principle of the embodiment of the application is as follows: when the power takeoff needs power output, an output shaft of the gearbox drives an input shaft 2-3 to rotate, a shifting fork 2-1 drives an engaging tooth sleeve 2-2 to move leftwards, so that the engaging tooth sleeve 2-2 is meshed with spline teeth 5 on the input shaft 2-3, the input shaft 2-3 drives the engaging tooth sleeve 2-2 to rotate, the engaging tooth sleeve 2-2 drives an input gear 2-4 to rotate, the input gear 2-4 drives a gear shaft 4-2 to rotate, and the gear shaft 4-2 drives a hydraulic pump to work through a transmission shaft.

When the power takeoff does not need power output, the shifting fork 2-1 drives the engaging gear sleeve 2-2 to move rightwards, the engaging gear sleeve 2-2 is disconnected with the spline teeth 5 on the input shaft 2-3, the input shaft 2-3 rotates, and power is not transmitted any more.

The gear shaft 4-2 is supported by the second bearing 4-3 and the third bearing 4-4, the two bearings share the load applied by each other, the stress is uniform, the possibility of radial deformation of the second bearing 4-3 and the third bearing 4-4 is reduced, the gear shaft 4-2 stably rotates around the axis of the gear shaft, and accordingly the gear disc is driven to continuously and stably cooperate with the shaft seal 4-8, and the problems of abnormal eccentric wear and oil leakage of the shaft seal 4-8 caused by insufficient radial supporting rigidity of the output end bearing of the gear shaft 4-2 due to the fact that a transmission shaft is long and no fixing device exists are solved. Meanwhile, the second bearing 4-3 and the third bearing 4-4 are one in size, so that the space of the existing shell 3 is fully utilized, and the change of the structure of the shell 3 is reduced.

It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

The meaning of "and/or" in the present application means that each exists alone or both exist.

"Connected" as used herein means either a direct connection between components or an indirect connection between components via other components.

With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.

Claims (10)

1. An output shaft duplex bearing support power takeoff for hoist, characterized by comprising:

The base (1) is used for being connected with a gearbox;

The shell (3), the said shell (3) is fixedly connected to the base (1), and the inside of the shell (3) has cavities;

The gear shaft (4-2) is partially positioned in the shell (3) and is rotationally connected with the shell (3), and one end of the gear shaft (4-2) positioned outside the shell (3) is used for being connected with a transmission shaft;

An input assembly (2), wherein the input assembly (2) is used for receiving power of a middle shaft of the gearbox and controlling power transmission or disconnection of the gear shaft (4-2); and

The novel gear comprises a first bearing (4-1), a second bearing (4-3) and a third bearing (4-4), wherein the first bearing (4-1) is arranged on a base (1), the second bearing (4-3) and the third bearing (4-4) are arranged on a shell (3) and are close to the output end of a gear shaft (4-2), and the inner rings of the first bearing (4-1), the second bearing (4-3) and the third bearing (4-4) are sleeved on the gear shaft (4-2).

2. The double-bearing support power takeoff for the output shaft of the crane according to claim 1, characterized in that the outer ring part of the second bearing (4-3) is embedded in the shell (3);

The bearing comprises a first bearing (4-1), a second bearing (4-3), a bearing seat (4-5) and a bearing seat (4-5), wherein the third bearing (4-4) is positioned on one side, deviating from the first bearing (4-1), of the second bearing (4-3), the bearing seat (4-5) is sleeved outside one end, extending out of the first bearing (3), of a gear shaft (4-2), the outer ring of the third bearing (4-4) is partially embedded into the bearing seat (4-5), one end, located outside the first bearing (3), of the gear shaft (4-2) is provided with a flange plate (4-7), and the flange plate (4-7) abuts against the inner ring of the third bearing (4-4).

3. The double-bearing support power takeoff for the output shaft of the crane according to claim 1, characterized in that a first check ring (4-6) is arranged between the second bearing (4-3) and the third bearing (4-4), and the first check ring (4-6) is sleeved on the gear shaft (4-2) and is abutted against the second bearing (4-3) and the inner ring of the third bearing (4-4).

4. The output shaft double bearing support power takeoff for a crane according to claim 1, characterized in that the outer diameter of the third bearing (4-4) is smaller than the outer diameter of the second bearing (4-3).

5. The output shaft double-bearing support power takeoff for a crane according to claim 1, characterized in that the first bearing (4-1) and the second bearing (4-3) are cylindrical roller bearings, and the third bearing (4-4) is a deep groove ball bearing.

6. The double-bearing support power takeoff for the output shaft of the crane according to claim 2, wherein a sealing component is arranged between the bearing seat (4-5) and the flange plate (4-7), a protective cover (4-9) for covering the sealing component is fixed on the bearing seat (4-5), the protective cover (4-9) is sleeved outside the flange plate (4-7), one end of the protective cover (4-9) far away from the bearing seat (4-5) axially extends along the flange plate (4-7) and is in clearance fit with the outer circumferential surface of the gear shaft (4-2), and a spiral groove (4-9-1) is formed in the protective cover (4-9) along the inner wall of the extending section of the flange plate (4-7).

7. The double-bearing support power takeoff for the output shaft of the crane according to claim 6, wherein the sealing assembly comprises a shaft seal (4-8), an inner ring of the shaft seal (4-8) is sleeved on the flange plate (4-7), and an outer ring of the shaft seal (4-8) is fixed with the inner wall of the bearing seat (4-5).

8. The double-bearing support power takeoff for an output shaft of a crane according to claim 7, characterized in that said shaft seals (4-8) are provided with at least two.

9. The double-bearing support power takeoff for an output shaft of a crane according to claim 6, characterized in that the cross section of the spiral groove (4-9-1) is triangular or trapezoidal or rectangular.

10. The output shaft double-bearing support power takeoff for a crane according to claim 1, characterized in that the input assembly (2) comprises an input shaft (2-3), an input gear (2-4), a joint gear sleeve (2-2) and a shifting fork (2-1), the input shaft (2-3) is rotationally connected in a shell (3) and is used for transmitting power output by a gearbox, the input gear (2-4) is sleeved on the input shaft (2-3) and is rotationally connected with the input shaft (2-3), the input gear (2-4) is meshed with the gear shaft (4-2), the joint gear sleeve (2-2) is sleeved on the input gear (2-4) and is in spline connection with the input gear (2-4), and spline teeth (5) are respectively arranged on the joint gear sleeve (2-2) and the input shaft (2-3);

The shifting fork (2-1) is arranged on the joint gear sleeve (2-2) and is used for driving the joint gear sleeve (2-2) to axially reciprocate along the input gear (2-4) so that the joint gear sleeve (2-2) is meshed with or separated from the spline teeth (5) of the input shaft (2-3).