阅读说明：本技术 一种自动变速选挡执行油缸 (Automatic speed-changing gear-selecting execution oil cylinder ) 是由 欧阳抗美 于 2018-08-31 设计创作，主要内容包括：本发明为商用汽车特别是城市客车电液控制机械自动变速器的一种自动变速选挡执行油缸。本发明能通过液压油缸的组合,完成4个选挡位置的精确定位动作。能满足城市客车复杂工况运行可靠性的要求。能灵活匹配不同结构的变速箱。(The invention relates to an automatic speed changing and gear selecting execution oil cylinder of an electro-hydraulic control mechanical automatic transmission of a commercial automobile, in particular to a city bus. The invention can complete the precise positioning action of 4 gear selecting positions through the combination of the hydraulic oil cylinders. The requirement of the running reliability of the city bus under complex working conditions can be met. The gearbox with different structures can be flexibly matched.)

1. An automatic speed change gear selection execution oil cylinder is characterized in that: a sliding bearing seat with a sealing piece on the end surface is used as a base, and a group of positioning oil cylinders of hollow positioning pistons of upper blocking shafts are overlapped. The hollow positioning piston not only plays a role in positioning a gear selecting position, but also enables the gear selecting shaft to freely slide axially in the hollow positioning piston. The hollow positioning piston simultaneously plays a role of supporting the gear selecting rod by the sliding bearing.

2. An automatic speed change gear selection execution oil cylinder is characterized in that: the gear selecting shaft extends out of a sliding bearing seat at one end of the execution oil cylinder and is provided with a gear selecting shifting fork.

3. An automatic speed change gear selection execution oil cylinder is characterized in that: the end face of a step gear selecting shaft of the composite oil cylinder is provided with an external thread connecting hole, the gear selecting shaft is provided with a thread sleeve, the thread sleeve is inserted into the thread connecting hole on the step gear selecting shaft, the thread sleeve is screwed up and connected, and the gear selecting shaft and the step gear selecting shaft are guaranteed to have a free aligning range of 0.5 mm.

4. An automatic speed change gear selection execution oil cylinder is characterized in that: and a gear selecting and reviving oil cylinder is superposed on the basis of the positioning oil cylinder. The gear selecting composite oil cylinder is a step hole, a hollow piston sleeve is arranged on a large hole, and a step gear selecting shaft is arranged on a small hole. The oil flow in and out of the two ends of the composite oil cylinder is controlled to operate and position.

Technical Field

The invention relates to an automatic speed changing and gear selecting execution oil cylinder of an electro-hydraulic control mechanical automatic transmission of a commercial automobile, in particular to a city bus. The invention can complete the precise positioning action of 4 gear selecting positions through the combination of the hydraulic oil cylinders. The requirement of the running reliability of the city bus under complex working conditions can be met. The gearbox with different structures can be flexibly matched.

Background requirements

At present, hydraulic gear selection and shifting of commercial automobiles, particularly urban buses are mainly integrated on a fast board, and the acting directions of gear selection and gear shifting are changed by a lever mechanism. The structure is complicated, and the volume is great. The requirements of the space structure and the quality of the rapid development of new vehicle models are not met. The invention adopts a group of composite positioning oil cylinders, a group of positioning oil cylinders with a gear selecting rod inserted into a hollow positioning piston are superposed, and a sliding bearing seat with an upper gear selecting shaft is superposed at the front end of the composite positioning oil cylinders to form an execution oil cylinder capable of completing the actions of 4 gear selecting positions. The gearbox with different structures can be flexibly matched.

Disclosure of Invention

In order to overcome the defect that the traditional gear selecting oil cylinder is provided with two oil cylinders at two ends, and a gear selecting shaft is provided with a shifting fork working structure in the middle, so that the spatial layout matching is limited, and in order to ensure the special matching requirement, the gear selecting shaft extends out of one end of a sliding bearing of an execution oil cylinder and is provided with the gear selecting shifting fork to execute a gear selecting task, and simultaneously, the gear selecting shaft bears axial and radial moments. The sliding bearing seat with a sealing element on the end surface is used as a base. And a group of positioning oil cylinders with hollow positioning pistons are superposed on the gear selecting shafts. The hollow positioning piston not only plays a role in positioning a gear selecting position, but also enables the gear selecting shaft to freely axially slide. The hollow positioning piston simultaneously plays a role of supporting the gear selecting rod by the sliding bearing. And a gear selecting and reviving oil cylinder is superposed on the basis of the positioning oil cylinder. The gear selecting composite oil cylinder is a step hole, a hollow piston sleeve is arranged on a large hole, and a step gear selecting shaft is arranged on a small hole. The positioning function of 3 gear selecting positions is completed by controlling the oil flow in and out of two ends of the composite oil cylinder. The end face of the step gear selecting shaft of the composite oil cylinder is provided with an external thread connecting hole, the gear selecting shaft is provided with a thread sleeve and is inserted into the step gear selecting shaft thread connecting hole, and the thread sleeve is screwed tightly to ensure that the gear selecting shaft and the step gear selecting shaft have a free aligning range of 0.5 mm. After the gear selecting oil cylinders are completely overlapped, the gear selecting shafts, the step gear selecting shafts and all pistons run smoothly and reliably.

The invention can effectively realize that the gear selecting shaft extends out of one end of the execution oil cylinder to execute the gear selecting task. 4 positioning positions for gear selection are compactly, accurately and reliably completed through superposition of oil cylinders with different structures. The gearbox with different structures can be flexibly matched.

Description of the drawings,

FIG. 1 is a front view of the present invention

In fig. 1:

1. a gear selecting shifting fork; 2, a sliding bearing seat, 3, a positioning oil cylinder; 4. a step gear selecting shaft; 5. a hollow piston sleeve; 6. an oil cylinder end cover; 7. a composite oil cylinder; 8, connecting a threaded sleeve; 9. a hollow positioning piston; 10. and selecting a gear shaft.

Detailed description of the preferred embodiments

The gear selecting shaft 10 extends out of one end of the sliding bearing seat 2 of the execution oil cylinder and is provided with a gear selecting shifting fork 1. The sliding bearing seat 2 with a sealing piece on the end face is used as a base. A positioning oil cylinder 3 of a hollow positioning piston 9 of a set of upper gear shaft 10 is superposed. The hollow positioning piston 9, besides functioning to position a gear selection position, the gear selection shaft 10 can freely slide axially in the hollow positioning piston 9. The hollow positioning piston 9 simultaneously functions as a sliding bearing supporting the selector lever. And a gear selecting and restoring oil cylinder 7 is superposed on the positioning oil cylinder 3. The gear selecting composite oil cylinder 7 is a step hole, a hollow piston sleeve 5 is arranged on a large hole, and a step gear selecting shaft 4 is arranged on a small hole. The operation and positioning are realized by controlling the oil flow in and out of the compound oil cylinder 7. The end face of the composite oil cylinder 7 is provided with an oil cylinder end cover 6. The end face of a step gear selecting shaft of the composite oil cylinder 7 is provided with an external thread connecting hole, the gear selecting shaft 10 is provided with a thread sleeve 8 and is inserted into the thread connecting hole on the step gear selecting shaft 4, and the thread sleeve 6 is screwed up and connected to ensure that the gear selecting shaft 10 and the step gear selecting shaft 4 have a free aligning range of 0.5 mm. After the gear selecting oil cylinders are completely overlapped, the gear selecting shaft 10, the step gear selecting shaft 4 and all pistons can smoothly and reliably operate.