CN216741654U

CN216741654U - VVL middle push rod of floating structure

Info

Publication number: CN216741654U
Application number: CN202220188962.4U
Authority: CN
Inventors: 朱明军
Original assignee: Yibin Tiangong Machinery Co ltd
Current assignee: Yibin Tiangong Machinery Co ltd
Priority date: 2022-01-24
Filing date: 2022-01-24
Publication date: 2022-06-14
Anticipated expiration: 2032-01-24

Abstract

The utility model discloses a VVL (variable valve timing) intermediate push rod with a floating structure, relates to the field of manufacturing of gasoline engine valves, and is mainly used for solving the problems that the inner hole of the conventional push rod structure is not uniformly abraded, the service life of the push rod is influenced, parts are dispersed, and the assembly efficiency of an engine is low. The main structure of the three-way push rod comprises a middle push rod body, wherein one end of the middle push rod body is provided with a triple bearing, the other end of the middle push rod body is an arc-shaped end face, and the middle part of the middle push rod body is provided with a bearing. The VVL middle push rod with the floating structure provided by the utility model has the advantages that the wear resistance of the bearing outer ring is increased, the service life of the middle push rod is prolonged, the subsequent assembly workload is reduced, and the assembly efficiency is improved.

Description

VVL middle push rod of floating structure

Technical Field

The utility model belongs to the field of manufacturing of gasoline engine valves, and particularly relates to a VVL (variable valve lift) middle push rod with a floating structure.

Background

VVL is shorthand for variable valve lift, english. The valve lift of a conventional gasoline engine is fixed and invariable. That is, only one cam profile of the camshaft. This makes it impossible for the lift to give a good response of the engine in both the high speed region and the low speed region. The valve lift-cam profile design of the traditional gasoline engine is a balance selection of the engine under all working conditions. As a result, the engine does not obtain the optimum high-speed efficiency nor the optimum low-speed torque. But the most balanced performance is obtained under all conditions. The application of the VVL technology ensures that the engine can obtain the valve lift meeting the requirements in a high-speed area and a low-speed area, thereby improving the high-speed power and low-speed torque of the engine, providing higher air intake and exhaust efficiency for the engine under various working conditions and rotating speeds, and reducing the oil consumption level while improving the power.

The VVL is segmented adjustable and continuously adjustable according to the control effect of the VVL. The adjustable engine has the advantages that the air inlet efficiency is improved by adopting the long stroke in the segmented adjustable mode when the engine rotates at a high speed, the engine can breathe more smoothly, larger air inlet negative pressure and more vortexes can be generated by adopting the short stroke in the low speed, air and fuel oil are fully mixed, and accordingly the torque output in the low speed is improved. The continuous adjustable valve lift can be continuously changed under most working conditions of the engine, and optimal valve lift matching is guaranteed, so that optimal performance is obtained. Present VVL middle push rod subassembly assembly mode still need carry out the secondary assembly to packing into between the engine for a set of bearing assembly of riveting on the middle push rod body, be about to middle push rod subassembly through adjusting pin and crescent plate pressure equipment together, and this kind of structure has two adverse factors: firstly, when the middle push rod assembly works, the middle push rod assembly swings at a small angle by taking an inner hole as a circle center, the inner hole of a middle push rod body is not abraded uniformly, and the service life of the middle push rod is influenced; secondly, before the parts are installed in the engine, the parts need to be assembled into a small unit of a crescent plate, an adjusting pin and a middle push rod in advance, and the assembly efficiency of the engine is low.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a VVL (variable valve timing) intermediate push rod with a floating structure, which aims to solve the problems that the inner hole of the existing push rod structure is not uniformly abraded, the service life of the push rod is influenced, parts are scattered, and the assembly efficiency of an engine is low.

In order to realize the purpose of the utility model, the adopted technical scheme is as follows: the utility model provides a VVL middle push rod of floating structure which characterized in that, middle push rod body one end sets up the trigeminy bearing, and the other end is the arc terminal surface, and the middle part sets up through round pin axle and this body coupling of middle push rod.

Furthermore, the triple bearing and the bearing are respectively connected with the middle push rod body through pin shafts.

Furthermore, a connecting groove for connecting the return spring is arranged on the arc-shaped end face. The spread groove is used for connecting return spring, provides spacing for middle push rod.

Further, the connecting groove is in clearance fit with the return spring. The middle push rod is connected with the return spring in a floating mode and can swing relative to the return spring.

Further, the outer diameter of the bearing in the middle of the triple bearing is larger than the outer diameters of the bearings on two sides. The middle bearing is contacted with the eccentric wheel, and the right eccentric wheel drives the small-amplitude swing; the bearings on the two sides are in contact with the groove plates, and the groove plates are fixed in position and provide axial limit during swinging.

Furthermore, the thickness of the bearing in the middle of the triple bearing is larger than that of the bearings on two sides. The contact surface of the eccentric wheel is enlarged.

Further, gaskets are arranged among three bearings of the triple bearing. The washer spaces between the bearings to prevent needle interference between different bearings.

Further, the bearing is a needle bearing.

Further, the triple bearing is a triple needle bearing.

The utility model has the beneficial effects that:

the outer ring of the triple bearing is in floating contact with the outer circle of the eccentric wheel, and the other group of single bearings are in contact with the air inlet cam shaft, so that the outer ring of the triple bearing and the outer circle of the eccentric wheel are subjected to rolling friction in the working process, the wear resistance of the outer ring of the bearing is improved, and the service life of the middle push rod is prolonged;

the bearing and the middle push rod body are connected in advance by the pin shaft, and the engine can be directly assembled on line when assembled, so that the subsequent assembly workload is reduced, the assembly efficiency is improved, and the production cost is saved.

Drawings

FIG. 1: the utility model has a structure schematic diagram;

FIG. 2: a cross-sectional view of the present invention;

FIG. 3: the utility model is applied to assembly schematic.

Reference numbers and corresponding part names in the drawings:

1-triple bearing, 2-pin shaft, 3-bearing, 4-middle push rod body, 5-servo motor, 6-eccentric wheel, 7-turbine, 8-rocker arm, 9-valve, 10-worm shaft, 11-return spring, 12-slotted plate, 13-air inlet camshaft, 14-gasket.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Fig. 1 shows a VVL intermediate push rod of a floating structure provided by the present invention, which includes an intermediate push rod body 4, wherein one end of the intermediate push rod is provided with a triple bearing 1, which is a triple needle bearing, and is connected to the intermediate push rod body 4 through a pin 2; the other end is an arc-shaped end surface, and a connecting groove for connecting the return spring 11 is arranged on the arc-shaped end surface; the middle part is provided with a bearing 3 which is connected with a middle push rod body 4 through a pin shaft 2, and the bearing 3 is a needle bearing. The bearing external diameter in the middle of the triple bearing 1 arranged at the opening end is larger than the bearing external diameters at two sides, the thickness of the middle bearing is larger than the thickness of the bearings at two sides, and a gasket 14 is arranged between the bearings.

The middle push rod is arranged in the VVL mechanism, a bearing with a larger middle outer diameter in the triple bearing 1 is in contact with the eccentric wheel 6, a bearing on one side of a bearing with a smaller outer diameter on two sides is in contact with the groove plate 12, the bearing 3 is in contact with the air inlet cam shaft 13, the position of the connecting groove 12 is fixed to provide limit for the swing of the middle push rod, and the return spring 11 is in floating connection with the middle push rod and can swing relatively between the two; the arc end surface of the middle push rod is contacted with the rocker arm 8.

When the valve is used, the bearing 3 is in contact with the air inlet camshaft 13, the air inlet camshaft 13 rotates to drive the middle push rod to swing at a large angle, and the rocker arm 8 connected with the middle push rod swings at a large angle, so that the valve 9 is controlled to be opened and closed. When the valve 9 is opened, the servo motor 5 is started to drive the worm shaft 10 to rotate, the worm shaft 10 rotates to drive the turbine 7 to rotate, the eccentric wheel 6 is fixedly connected with the turbine 7, the turbine 7 rotates to drive the eccentric wheel 6 to rotate, the eccentric wheel 6 is in contact with the middle bearing in the triple bearing 1, the middle push rod is connected with the middle push rod to swing at a small angle, and the rocker arm 8 connected with the middle push rod is driven to swing at a small angle, so that the opening degree of the valve 9 is controlled.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a push rod in middle of VVL of floating structure, its characterized in that, includes middle push rod body (4), and middle push rod body (4) one end sets up triple bearing (1), and the other end is the arc terminal surface, and the middle part sets up bearing (3).

2. A VVL intermediate tappet of a floating structure, according to claim 1, characterized in that the triple bearing (1) and the bearing (3) are connected to the intermediate tappet body (4) by means of a pin (2).

3. The VVL intermediate push rod for a floating structure of claim 2, wherein a connecting groove for connecting the return spring is provided on the arc-shaped end surface.

4. The VVL intermediate push rod for a floating structure of claim 3, wherein the connecting groove is loosely fitted with the return spring.

5. A VVL intermediate push rod for floating structures according to claim 2, characterised in that the bearing outer diameter in the middle of the triple bearing (1) is larger than the bearing outer diameters on both sides.

6. A VVL intermediate tappet of a floating structure, according to claim 2, characterized in that the bearing thickness in the middle of the triple bearing (1) is greater than the bearing thickness on both sides.

7. A VVL intermediate tappet of a floating structure, according to claim 2, characterized in that washers (11) are provided between the three bearings of the triple bearing (1).

8. The VVL intermediate tappet of a floating structure, as claimed in any one of claims 1 to 7, wherein the bearing (3) is a needle bearing.

9. The VVL intermediate tappet of a floating structure of claims 1 to 7, wherein the triple bearing (1) is a triple needle bearing.