Drive axle power disconnecting mechanism

Abstract

The invention relates to a drive axle power disconnecting mechanism which is applied to a middle drive axle, and driving force leading to a rear axle is cut off through the power disconnecting mechanism. The power disconnecting mechanism comprises a driving cylindrical gear, a sliding meshing sleeve, a half axle gear, an input shaft, a through shaft, a shifting fork shaft and a shifting fork, the driving cylindrical gear is arranged on the input shaft in a sleeving mode and connected with the input shaft through an internal spline, the half axle gear is arranged on the input shaft and the through shaft in a sleeving mode, and the half axle gear and the through shaft are connected through splines; the sliding meshing sleeve is sleeved on the driving cylindrical gear and the half axle gear and can slide left and right to realize meshing and separation of the power disconnecting mechanism, and two ends of the shifting fork are respectively matched and assembled with the shifting fork shaft and the sliding meshing sleeve. The whole vehicle can be driven to run without transmitting power by the rear drive axle, and the drive axle power leading to the rear axle is cut off by the power cut-off mechanism of the middle drive axle during running, so that the mechanical transmission efficiency is improved, and the purposes of reducing oil consumption, saving energy and reducing emission are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of drive axle power disconnect mechanism. BACKGROUND

[0002] At present, commercial vehicle market tractor head driving form is mainly 6X4, part exists when disconnecting rear drive axle power in empty load, realize 6X2 driving form conversion, and the empty load power disconnect bridge scheme in current market mainly increases power interruption separation structure at rear cover through shaft, power separation from through shaft and output shaft when working to cut off the driving force to rear axle, this structure has the disadvantages of low reliability, complex structure, weak power disconnect structure strength;Middle shaft is prone to shift, resulting in the length of the middle shaft and meshing set key cooperation shortening, tip is prone to wear and tear etc.;At the same time, most of the vehicle models on the market cannot realize the conversion of driving form from 6X4 to 6X2, have the disadvantages of low transmission efficiency, large oil consumption loss, do not meet the national emission policy etc. when empty load. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a kind of drive axle power disconnect mechanism, so that the whole commercial vehicle can drive in the process of empty load running without the need of rear drive axle to transmit power, and the power of driving axle to rear axle is cut off by using the power disconnect mechanism of middle drive axle in driving.

[0004] The technical solution to solve the above technical problems is: a kind of drive axle power disconnect mechanism, power disconnect mechanism is applied to middle drive axle, and the driving force to rear axle is cut off by power disconnect mechanism;Power disconnect mechanism is arranged on middle drive axle, and power disconnect mechanism includes driving cylindrical gear, sliding meshing sleeve, half shaft gear, input shaft, through shaft, yoke shaft and yoke, driving cylindrical gear is sleeved on input shaft and connected with input shaft through inner spline, half shaft gear is respectively sleeved on input shaft and through shaft, and half shaft gear and through shaft are connected through spline, sliding meshing sleeve is sleeved on driving cylindrical gear and half shaft gear and can slide left and right to realize the engagement and separation of power disconnect mechanism, the both ends of yoke are respectively matched with yoke shaft and sliding meshing sleeve, and input shaft and half shaft gear are power separated by sliding sliding meshing sleeve when working, so as to cut off the driving force to rear axle.

[0005] The further technical solution of the present application is: needle roller bearing is arranged between half shaft gear and input shaft, and half shaft gear is sleeved on input shaft through needle roller bearing. Thrust bearing is arranged between driving cylindrical gear and half shaft gear in axial direction, and thrust bearing is sleeved on input shaft and located between driving cylindrical gear and half shaft gear. The engagement teeth between driving cylindrical gear and sliding meshing sleeve are all engagement teeth with reverse taper angle, and the tooth profile section of engagement teeth on driving cylindrical gear and sliding meshing sleeve changes from large to small along the direction of mutual separation.

[0006] Power disconnect method: when the interaxle differential lock is inflated, the shift fork shaft and the shift fork are pushed to move, thereby driving the sliding engagement sleeve to slide out of engagement with the driving cylindrical gear, so that the driving cylindrical gear and the half shaft gear are separated, thereby achieving power disconnect between the input shaft and the half shaft gear to cut off the driving force to the rear axle.

[0007] Due to the adoption of the above technical solutions, the driving axle power disconnect mechanism has the following beneficial effects: With the application, the 6X4 driving mode commercial vehicle can run without the rear driving axle transmitting power during the no-load running process, and the driving axle power to the rear axle is cut off by the power disconnect mechanism of the middle driving axle during running, so that the rear driving axle becomes a driven axle without driving force. After the driving force to the rear axle is cut off, the vehicle can reduce one running part loss, thereby improving the mechanical transmission efficiency, reducing fuel consumption, and achieving the purpose of energy saving and emission reduction.

[0008] The application adopts an interaxle differential part replaced by a power disconnect mechanism, the power between the input shaft and the half shaft gear is disconnected by sliding the sliding engagement sleeve, the rear structure is simplified after the interaxle differential is cancelled, the assembly and maintenance are improved, and the power disconnect mechanism has good strength. The reverse taper angle is added to the meshing tooth profile between the driving cylindrical gear and the sliding engagement sleeve of the power disconnect mechanism, the meshing tightness is improved, the sliding of the engagement sleeve during running is prevented, and the reliability of the mechanism is improved.

[0009] The driving axle power disconnect mechanism in the application is suitable for traction vehicles and cargo trucks, and can be realized without damaging the original vehicle chassis layout. The application has the characteristics of strong universality, simple structure, simple assembly and maintenance, high power disconnect mechanism strength, high reliability, anti-sliding wear, long service life, and the like. The vehicle reduces one running part loss, improves the mechanical transmission efficiency, and reduces fuel consumption, thereby achieving energy saving and emission reduction and reducing operating costs.

[0010] Next, the technical features of the driving axle power disconnect mechanism will be further described in combination with the drawings and specific embodiments in the specification. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 : A structural schematic diagram of a driving axle power disconnect mechanism.

[0012] Figure 2 : An exploded state schematic diagram of a driving cylindrical gear and a sliding engagement sleeve.

[0013] Figure 3 : An exploded state schematic diagram of a driving cylindrical gear and a sliding engagement sleeve.

[0014] In the above drawings, the following explanations are given to the respective reference numerals: 1 - driving spur gear, 2 - sliding engagement sleeve, 3 - thrust bearing, 4 - half axle gear, 5 - input shaft, 6 - needle bearing, 7 - through shaft, 8 - yoke shaft, 9 - yoke, 10 - engagement tooth of reverse taper angle structure DETAILED DESCRIPTION

[0015] The power disconnect mechanism of the drive axle is applied to the middle drive axle, and the driving force to the rear axle is cut off through the power disconnect mechanism. The power disconnect mechanism is arranged on the middle drive axle, and the power disconnect mechanism comprises a driving spur gear 1, a sliding engagement sleeve 2, a half axle gear 4, an input shaft 5, a through shaft 7, a yoke shaft 8 and a yoke 9. The driving spur gear 1 is sleeved on the input shaft 5 and connected with the input shaft 5 through internal splines. The half axle gear 4 is sleeved on the input shaft 5 and the through shaft 7 at both ends respectively, and the half axle gear 4 and the through shaft 7 are connected through splines. The sliding engagement sleeve 2 is sleeved on the driving spur gear 1 and the half axle gear 4 and can slide left and right to realize engagement and separation of the power disconnect mechanism. The yoke 9 is assembled with the yoke shaft 8 and the sliding engagement sleeve 2 at both ends respectively. In work, the input shaft is separated from the half axle gear through sliding of the sliding engagement sleeve 2, so that the driving force to the rear axle is cut off.

[0016] The needle bearing 6 is arranged between the half axle gear 4 and the input shaft 5 on which the half axle gear 4 is sleeved through the needle bearing 6. The thrust bearing 3 is arranged axially between the driving spur gear 1 and the half axle gear 4. The thrust bearing 3 is sleeved on the input shaft 5 and located between the driving spur gear 1 and the half axle gear 4. The thrust bearing 3 is in contact with the driving spur gear 1 and the half axle gear 4 respectively at both sides. The inner wall of the sliding engagement sleeve is provided with engagement teeth at both sides respectively. The driving spur gear 1 and the half axle gear 4 are provided with corresponding engagement teeth of the sliding engagement sleeve. The sliding engagement sleeve is connected with the driving spur gear 1 and the half axle gear 4 through the engagement teeth respectively. The engagement teeth between the driving spur gear 1 and the sliding engagement sleeve are all engagement teeth with reverse taper angles. The tooth profile section of the engagement teeth on the driving spur gear and the sliding engagement sleeve changes from large to small along the direction of mutual separation. The engagement is improved to prevent the movement when the power is not disconnected.

[0017] The application relates to a power disconnecting mechanism applied to a driving axle of a vehicle, which is characterized in that the structure of an inter-axle differential is simplified and the inter-axle differential is cancelled at the position of the inter-axle differential, then a power disconnecting device is added at the position of the inter-axle differential, the input shaft and the half axle gear are disconnected in operation, so that the driving force to the rear axle is cut off. When the power disconnecting mechanism of the vehicle driving axle is inflated, the yoke pushes the sliding engagement sleeve to be separated from the driving cylindrical gear, so that the power transmission between the input shaft and the half axle gear is disconnected, and the driving mode is changed from 6X4 to 6X2. The power disconnecting method is as follows: when the inter-axle differential lock is inflated, the yoke shaft 8 and the yoke 9 are pushed to move, so as to drive the sliding engagement sleeve 2 to slide and separate from the driving cylindrical gear 1, the driving cylindrical gear 1 and the half axle gear 4 are separated, and the power disconnecting between the input shaft 5 and the half axle gear 4 is realized, so that the driving force to the rear axle is cut off.

[0018] Specific embodiments: the power disconnecting mechanism comprises a driving cylindrical gear 1, a sliding engagement sleeve 2, a thrust bearing 3, a half axle gear 4, an input shaft 5, a needle bearing 6, a through shaft 7, a yoke shaft 8 and a yoke 9. The driving cylindrical gear 1 is assembled on the input shaft 5 through internal splines, the half axle gear 4 is assembled on the main reduction shell through bearings, the inner hole of the half axle gear 4 is matched with the input shaft 5 through the needle bearing 6, the thrust bearing 3 is assembled between the driving cylindrical gear 1 and the half axle gear 4 in the axial direction to reduce friction, the sliding engagement sleeve 2 is sleeved on the driving cylindrical gear 1 and the half axle gear 4 and can slide left and right to realize the engagement and separation of the power disconnecting mechanism, the half axle gear 4 and the through shaft 7 are connected through splines, and the two ends of the yoke 9 are respectively matched and assembled with the yoke shaft 8 and the sliding engagement sleeve 2.

[0019] When the inter-axle differential lock is not inflated, the yoke shaft 8, the yoke 9 and the sliding engagement sleeve 2 do not move, the two ends of the sliding engagement sleeve 2 are respectively engaged with the driving cylindrical gear 1 and the half axle gear 4, and the upper surfaces of the engaged teeth between the driving cylindrical gear 1 and the sliding engagement sleeve are provided with reverse taper angles (that is, the engaged tooth shape in the axial direction is provided with an angle, the axial cross section of the engaged tooth shape is a structure that one end is large and the other end is small, and the tooth shape cross section changes from large to small along the separation direction of the driving cylindrical gear and the sliding engagement sleeve), which is helpful to improve the engagement reliability and prevent axial movement.

[0020] When the inter-axle differential lock is inflated, the yoke shaft 8 and the yoke 9 are pushed to move to the right, so as to drive the sliding engagement sleeve 2 to slide to the right and separate from the engagement with the driving cylindrical gear 1, the driving cylindrical gear 1 and the half axle gear 4 are separated, so that the power disconnecting between the input shaft 5 and the half axle gear 4 is realized, and the driving force to the rear axle is cut off.

Claims

1. A drive axle power disconnect mechanism characterized by: The power disconnect mechanism is applied to the middle drive axle, and the driving force to the rear axle is cut off through the power disconnect mechanism. The power disconnect mechanism is arranged on the middle drive axle, and the power disconnect mechanism comprises a driving cylindrical gear, a sliding engagement sleeve, a half shaft gear, an input shaft, a through shaft, a fork shaft and a fork. The driving cylindrical gear is sleeved on the input shaft and connected with the input shaft through internal splines. The half shaft gear is sleeved on the input shaft and the through shaft, and the half shaft gear and the through shaft are connected through splines. The sliding engagement sleeve is sleeved on the driving cylindrical gear and the half shaft gear and can slide left and right to realize engagement and separation of the power disconnect mechanism. The fork is assembled at two ends of the fork shaft and the sliding engagement sleeve.

2. A needle bearing is arranged between the half shaft gear and the input shaft, and the half shaft gear is sleeved on the input shaft through the needle bearing.

3. A drive axle power disconnect mechanism as in claim 1, wherein: An axial thrust bearing is arranged between the driving cylindrical gear and the half shaft gear, and the thrust bearing is sleeved on the input shaft and located between the driving cylindrical gear and the half shaft gear.

4. A drive axle power disconnect mechanism as in claim 1, wherein: The engagement teeth between the driving cylindrical gear and the sliding engagement sleeve are all engagement teeth with reverse taper angles, and the tooth profile sections of the engagement teeth on the driving cylindrical gear and the sliding engagement sleeve change from large to small along the mutual separation direction.

5. A drive axle power disconnect mechanism as in claim 1, wherein: The power disconnect method is as follows: when the inter-axle differential lock is inflated, the fork shaft and the fork are moved to drive the sliding engagement sleeve to slide and disengage the engagement with the driving cylindrical gear, so that the driving cylindrical gear and the half shaft gear are separated, thereby realizing the power disconnect between the input shaft and the half shaft gear and cutting off the driving force to the rear axle.

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