Power takeoff adopting jaw clutch

Abstract

The utility model provides a power takeoff adopting a jaw clutch. The power takeoff comprises a shell and the jaw clutch arranged in the shell. An input shaft is arranged on one side of the shell, and an output shaft is arranged on the other side of the shell. Wherein the jaw clutch comprises a piston, a gear shaft and a reset mechanism; the outer surface of the input shaft is sleeved with the piston in an axial sliding mode, an annular cavity is formed between the outer surface of the piston and the shell, and a pressurizing opening communicated with the annular cavity is formed in the shell; a gap is formed between the piston and the gear shaft, and teeth which are meshed with each other are further arranged on the piston and the gear shaft; the piston moves in the axial direction to be connected with the gear shaft in a meshed mode by controlling the pressure in the annular cavity to be increased, and the gear shaft is connected with the output shaft in a gear transmission mode. The reset mechanism is arranged on the outer side of the output end of the input shaft and located between the piston and the gear shaft, the device is easy to operate, clamping stagnation cannot occur, the structure is compact, the weight is light, the installation space is saved, application is wider, and good economic benefits are achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a power takeoff, in particular to a power takeoff adopting a jaw clutch. BACKGROUND

[0002] The power takeoff is a kind of power transmission device, usually through gear and transmission connection, the power of engine transmitted by transmission is transmitted to external working device to realize corresponding power transmission function.

[0003] In the prior art, the power takeoff is mostly through the mode of shifting shift fork or shifting sliding sleeve to realize the power output and disconnection of the power takeoff, but the above mode generally causes the problems of large size of the power takeoff, untimely gear shifting of the power takeoff, and shift fork piston jamming.

[0004] Chinese patent (CN116972080A) discloses a hydraulic control jaw clutch four-wheel drive mechanism and working method, and the specific scheme is to combine and separate four-wheel drive piston and four-wheel drive output shaft by hydraulic control four-wheel drive piston to realize power conversion between two-wheel drive and four-wheel drive, and realize jaw clutch self-centering function through tooth end face inclination angle by designing jaw clutch tooth structure, so that the mechanism is stably meshed, accurately limited and self-locked during work; but the jaw clutch used in the technical scheme cannot be applied in the power takeoff, so the problems of large size of the power takeoff, untimely gear shifting of the power takeoff and shift fork piston jamming in the prior art cannot be solved. UTILITY MODEL CONTENTS

[0005] The utility model discloses a power takeoff adopting a jaw clutch to solve the technical problems of large size, untimely gear shifting and shift fork piston jamming of the existing power takeoff.

[0006] The specific technical scheme of the utility model is as follows:

[0007] A power takeoff adopting a jaw clutch, which is characterized in that:

[0008] The utility model discloses a power takeoff adopting a jaw clutch to solve the technical problems of large size, untimely gear shifting and shift fork piston jamming of the existing power takeoff.

[0009] The dog clutch comprises a piston, a gear shaft and a reset mechanism; one end of the gear shaft is coaxially and rotatably connected with the output end of the input shaft through a support shaft; the piston is axially slidably sleeved on the outer surface of the input shaft, and an annular cavity is arranged between the outer surface of the piston and the shell; a pressurizing port communicating with the annular cavity is arranged on the shell; the piston and the gear shaft are provided with teeth meshing with each other; the other end of the gear shaft is arranged on the shell, and the gear shaft is drivingly connected with a driven gear arranged on the output shaft through a driving gear arranged on the gear shaft; and the reset mechanism is arranged outside the output end of the input shaft and between the piston and the gear shaft.

[0010] Further, the piston is in a stepped structure, the large end of the piston is close to the gear shaft, the annular cavity is located on the outer side wall of the small end, and is arranged close to the large end; when the pressure in the annular cavity increases, the large end of the piston is axially stressed and drives the piston to slide towards the gear shaft.

[0011] Further, the piston is in a stepped structure, the large end of the piston is close to the gear shaft, the annular cavity is located on the outer side wall of the small end, and is arranged close to the large end; when the pressure in the annular cavity increases, the large end of the piston is axially stressed and drives the piston to slide towards the gear shaft.

[0012] Further, to prevent gas or liquid leakage in the annular cavity, first and second sealing rings are arranged between the outer side walls of the two ends of the piston and the shell.

[0013] Further, the output end of the input shaft is provided with a support groove, one end of the support shaft connected with the input shaft is located in the support groove, and a needle bearing is arranged between the support shaft and the input shaft to reduce the friction coefficient between the support shaft and the input shaft and realize stable rotation of the input shaft and the gear shaft.

[0014] Further, one end of the gear shaft is coaxially provided with a disc, the center of the large end of the piston and the center of the disc close to one end of the piston are provided with grooves, the teeth on the piston and the gear shaft are located on the end faces outside the grooves, and the reset mechanism is arranged in the grooves.

[0015] Further, the reset mechanism comprises an elastic retainer, a rigid washer and a return spring, the return spring is sleeved on the outside of the input shaft, one end of the return spring abuts against the stepped surface on the inside of the piston, the other end of the return spring is connected with the rigid washer, and the elastic retainer is fixedly arranged on the outer surface of the input shaft close to the gear shaft and abuts against the rigid washer to be clamped.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] (1) The utility model discloses a mechanical structure design of piston, gear shaft and input shaft in the toothed clutch, can realize the transmission of power through the pressure in annular cavity, simple operation, not only will appear the situation of fork piston jam in prior art, and compact structure, light weight, can save installation space, make the application more widely, improve economic benefit.

[0018] (2) The utility model discloses the coaxial rotatable connection of support shaft and support groove, installs the needle bearing at the cooperation of support groove and support shaft, not only can make input shaft and gear shaft keep accurate position and axial direction, and reduce the friction coefficient between both, realize the stable rotation of both, improve the reliability of device.

[0019] (3) The utility model discloses the cooperation of return spring, elastic baffle and rigid washer, can make piston and gear shaft break the meshing and return to the initial position when there is no external pressure in annular cavity, simplify the operation process, improve the work efficiency of device, avoid the security risk caused by the non-resetting of component, enhance the security, prolong the life of equipment. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the structure schematic view of the power takeoff of the utility model adopting toothed clutch.

[0021] Figure 2 It is the sectional view of toothed clutch in the embodiment of the utility model.

[0022] In the drawing: 1 - shell, 2 - first sealing ring, 3 - piston, 4 - second sealing ring, 5 - gear shaft, 6 - support shaft, 7 - elastic baffle, 8 - rigid washer, 9 - return spring, 10 - needle bearing, 11 - output shaft, 12 - input shaft, 13 - toothed clutch. DETAILED DESCRIPTION

[0023] The utility model will be further explained in detail in combination with specific embodiment, and it is explained that the utility model is not limited.

[0024] Refer to the attached Figure 1 And Figure 2The embodiment provides a power take-off device adopting a dog clutch, which comprises a shell 1 and a dog clutch 13 arranged in the shell 1, one side of the shell 1 is provided with an input shaft 12, the other side of the shell 1 is provided with an output shaft 11, wherein the dog clutch 13 comprises a piston 3, a gear shaft 5 and a reset structure, the piston 3 is axially slidably sleeved on the outer surface of the input shaft 12, the piston 3 is in a stepped structure, there is a gap between the piston 3 and the gear shaft 5, the force receiving area of one end of the piston 3 close to the gear shaft 5 is large, meanwhile, the outer side walls of both ends of the piston 3 are provided with a first sealing ring 2 and a second sealing ring 4 between the piston 3 and the shell 1, an annular cavity is formed between the shell 1, the piston 3, the first sealing ring 2 and the second sealing ring 4, the shell 1 is further provided with a pressure boosting port for connecting the annular cavity with the outside, meanwhile, the piston 3 and the gear shaft 5 are provided with teeth which are meshed with each other, when the pressure in the annular cavity becomes large, the piston 3 is axially stressed and gradually approaches the gear shaft 5 along the axial direction of the input shaft 12 due to the cooperation between the inner spline of the piston 3 and the outer spline of the input shaft 12, until the teeth on the piston 3 are meshed with the teeth on the gear shaft 5, so that the gear shaft 5 rotates synchronously with the input shaft 12, the other end of the gear shaft 5 is arranged on the shell 1, and the gear shaft 5 is in transmission connection with the output shaft 11 in a gear meshing mode, and power is output.

[0025] One end of the gear shaft 5 is provided with a support shaft 6 which plays a supporting and guiding role, the output end of the input shaft 12 is provided with a support groove which is used for coaxial rotatable connection with the support shaft 6, that is, one end of the support shaft 6 connected with the input shaft 12 is located in the support groove, and a needle bearing 10 is arranged between the support shaft 6 and the input shaft 12, so as to reduce the friction coefficient of the support shaft 6 and the input shaft 12, when the gear shaft 5 rotates synchronously with the input shaft 12, the accurate position and axial direction can be maintained, and stable rotation can be realized.

[0026] The pressure boosting port arranged on the shell 1 and connected with the annular cavity is controlled by a switch valve, the opening control is used for controlling high-pressure gas or liquid to enter the annular cavity, the pressure in the annular cavity becomes large, the piston 3 is controlled to move towards the gear shaft 5 until the teeth on the piston 3 are meshed with the teeth on the gear shaft, and the closing control is used for controlling the high-pressure gas or liquid to stop entering the annular cavity, at this time, the gas or liquid in the annular cavity is not affected by external pressure, under the action of the reset structure, the piston 3 is disconnected from the gear shaft 5 and returns to the initial position, and the gas or liquid is discharged to the outside.

[0027] In the embodiment, the reset mechanism comprises an elastic check ring 7, a rigid washer 8 and a return spring 9, mainly relies on the elastic force of the return spring 9 to push the piston 3 to move away from the gear shaft 5, and the elastic check ring 7 and the rigid washer 8 limit the return spring 9, specifically, the return spring 9 is sleeved on the outside of the input shaft 12, one end of the return spring 9 abuts against the stepped surface in the inside of the piston 3, the other end is connected with the rigid washer 8, the elastic check ring 7 is fixedly arranged on the outer surface of the input shaft 12 close to the gear shaft 5 and abuts against the rigid washer 8 to be clamped, thereby realizing the axial limitation of the return spring 9 and preventing the return spring 9 from moving excessively in the axial direction.

[0028] Specific working principle:

[0029] When the power needs to be transmitted and output by the power extractor, the power is first obtained from the transmission by the input shaft 12, since the piston 3 is connected with the input shaft 12 by the spline, the piston 3 rotates synchronously with the input shaft 12, at this time, the high-pressure gas or liquid is controlled to enter the annular cavity by the switch valve, since the one end of the piston 3 close to the gear shaft 5 has a large force area, under the pressure, the piston 3 moves to the gear shaft 5 and compresses the return spring 9, until the teeth on the gear shaft 5 mesh with the teeth on the piston 3, the gear shaft 5 rotates synchronously with the piston 3, since the gear shaft 5 is connected with the output shaft 11 by the gear transmission, at this time, the output shaft 11 also rotates to output power.

[0030] When the power needs to be interrupted in the power extractor, the switch valve is controlled to be closed, so that the gas or liquid no longer enters the annular cavity, at this time, the gas or liquid in the annular cavity has no external pressure, the piston 3 moves away from the gear shaft 5 under the elastic force of the return spring 9 until it returns to the initial position, the gas or liquid is discharged to the outside, at this time, the piston 3 is disconnected with the gear shaft 5, so the power on the input shaft 12 cannot be transmitted to the gear shaft 5, therefore, the output shaft 11 also has no power output.

[0031] The above is only the preferred embodiment of the utility model, and is not used for limiting the utility model, for the person skilled in the art, the utility model can have various changes and changes, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model. In addition, it should be noted that the drawings are only used as examples, and are not drawn according to the condition of the same proportion, and should not be used as the limitation of the protection scope actually required by the application.

Claims

1. A power take-off device using a dog clutch, characterized in that: it comprises a housing (1) and a dog clutch (13) arranged in the housing (1); the housing (1) is provided with an input shaft (12) on one side for providing power to the dog clutch (13) and an output shaft (11) on the other side; the dog clutch (13) comprises a piston (3), a gear shaft (5) and a reset mechanism; one end of the gear shaft (5) is coaxially and rotatably connected with the output end of the input shaft (12) through a support shaft (6); the piston (3) is axially slidably sleeved on the outer surface of the input shaft (12), and an annular cavity is arranged between the outer surface of the piston (3) and the housing (1), and a booster port is arranged on the housing (1) and communicates with the annular cavity; the piston (3) and the gear shaft (5) have a gap therebetween, and the piston (3) and the gear shaft (5) are further provided with teeth that mesh with each other; the other end of the gear shaft (5) is arranged on the housing (1), and the gear shaft (5) is drivingly connected with a driven gear arranged on the output shaft (11) through a driving gear arranged thereon; the reset mechanism is arranged outside the output end of the input shaft (12) and between the piston (3) and the gear shaft (5).

2. The power take-off device using a dog clutch according to claim 1, characterized in that: the piston (3) is in a stepped structure, the large end of which is close to the gear shaft (5), and the annular cavity is arranged on the outer side wall of the small end and close to the large end.

3. The power take-off device using a dog clutch according to claim 1, characterized in that: the piston (3) is connected with the input shaft (12) through splines.

4. The power take-off device using a dog clutch according to claim 2 or 3, characterized in that: first and second sealing rings (2) and (4) are arranged between the outer side walls of both ends of the piston (3) and the housing (1).

5. The power take-off device using a dog clutch according to claim 1, characterized in that: the output end of the input shaft (12) is provided with a support groove, one end of the support shaft (6) connected with the input shaft (12) is located in the support groove, and a needle bearing (10) is arranged between the support shaft (6) and the input shaft (12).

6. The power take-off device using a dog clutch according to claim 2, characterized in that: one end of the gear shaft (5) is coaxially provided with a disc, the center of the large end of the piston (3), and the center of the disc close to one end of the piston (3) are provided with grooves, the teeth on the piston (3) and the gear shaft (5) are located on the end faces outside the grooves, and the reset mechanism is arranged in the grooves.

7. The power take-off device using a dog clutch according to claim 6, characterized in that: ​ The reset mechanism comprises an elastic check ring (7), a rigid washer (8) and a return spring (9), the return spring (9) is sleeved on the outside of the input shaft (12), one end of the return spring (9) abuts on the step face on the inside of the piston (3), the other end of the return spring (9) is connected with the rigid washer (8), and the elastic check ring (7) is fixedly arranged on the outer surface of the input shaft (12) close to the gear shaft (5) and abuts against the rigid washer (8).

Images