WO2024051732A1

WO2024051732A1 - Auxiliary valve driving mechanism

Info

Publication number: WO2024051732A1
Application number: PCT/CN2023/117210
Authority: WO
Inventors: 奚正; 朱汝杰; 杨洲
Original assignee: 上海尤顺汽车技术有限公司
Priority date: 2022-09-07
Filing date: 2023-09-06
Publication date: 2024-03-14

Abstract

An auxiliary valve driving mechanism (100), comprising a box body (210), connecting rods, a starting piston (162), and a driving piston (130). The starting piston (162) is provided in a starting piston hole (260) of the box body (210); the driving piston (130) is provided in a driving piston hole (190); the connecting rods comprise a first connecting rod (184) and a second connecting rod (186); the end face of a first end of the first connecting rod (184) is connected to the box body (210) by means of a rotating pair (122); the end face of a second end of the first connecting rod (184) is connected to the end face of a first end of the second connecting rod (186) by means of a rotating pair (125); a rotating pair (128) is provided between the end face of a second end of the second connecting rod (186) and a first end face of the driving piston (130); and a second end face (131) of the driving piston (130) is located above a valve of an engine. A guide groove (137) is formed at an end (134) of the starting piston (162); the second end of the first connecting rod (184) and the first end of the second connecting rod (186) are located in the guide groove (137); and the first connecting rod (184) and the second connecting rod (186) do planar motion between a "closed" position and an "open" position along the guide groove (137), so that the driving piston (130) moves up and down. A non-operation position and an operation position of the auxiliary valve driving mechanism (100) are obtained, and auxiliary valve motion for the engine is generated, comprising valve motion for engine braking.

Description

A kind of auxiliary valve driving mechanism

Technical field

The present invention relates to the field of machinery, in particular to an engine, and in particular to an auxiliary valve driving mechanism of an engine.

Background technique

In the prior art, the conventional valve driving method of vehicle engines is well known, and its application has a history of more than 100 years. However, due to the additional requirements for engine emissions and engine braking (engine braking can also be used to assist gear shifting), more and more engines need to add auxiliary valve movement on the basis of conventional valve movement, such as for exhaust gas recirculation. Cyclic valve motion and engine braking valve motion. Among them, engine brakes have become a must-have device for heavy-duty commercial vehicle engines.

The traditional engine brake is a box-type hydraulic drive mechanism mounted on the engine. To install this type of engine brake, a gasket is added between the cylinder and the valve cover, thus adding additional height, weight and cost to the engine. The above problems are caused by treating the engine braking system as an additional accessory of the engine, rather than as a component or integrated part of the engine.

Another disadvantage of hydraulically driven conventional engine brakes is the retractability or deformation of the hydraulic system. This is related to the flexibility of the fluid. High flexibility results in a large reduction in compression of the brake valve lift. A reduction in valve lift results in a reduction in valve load. increases, and the increase in valve load leads to higher flexibility, creating a vicious cycle. In addition, the valve lift reduction caused by hydraulic deformation increases with engine speed, which is exactly the opposite of the brake valve lift trend required for engine braking performance. To reduce hydraulic flexibility, larger diameter hydraulic pistons must be used, increasing volume and weight. Moreover, it takes a long time for the oil flow to extend or retract the large-diameter piston, resulting in large inertia and slow response of the braking system.

Contents of the invention

The object of the present invention is to provide a fixed-chain auxiliary valve driving mechanism. The valve driving mechanism solves the problem in the prior art that the overhead mode of the engine braking system increases the height, weight and manufacturing cost of the engine. Technical problems, and at the same time, it is necessary to solve the technical problems of braking system deformation, large inertia and slow response of hydraulically driven engine brakes.

The auxiliary valve driving mechanism of the present invention includes a box, a connecting rod, a starting piston and a driving piston. The box is provided with a starting piston hole and a driving piston hole that intersect vertically, and a starting piston is provided in the starting piston hole. There is a driving piston in the driving piston hole. The connecting rod includes connecting rod one and connecting rod two. The end face of the first end of connecting rod one is connected to the box through the rotating pair. The end face of the second end of connecting rod one and the first end face of connecting rod two are connected. The end faces of the two ends are connected by a rotating pair. There is a rotating pair between the end face of the second end of the connecting rod and the end face of the driving piston. The end face of the driving piston is located above the valve of the engine. It is characterized in that: one end of the starting piston is provided with a guide groove, the second end of connecting rod one and the first end of connecting rod two are located in the guide groove, and connecting rod one and connecting rod two make planar motion along the guide groove between the "off" position and the "open" position. In the above-mentioned "off" position, connecting rod one and connecting rod two form an included angle, driving the end face two of the piston away from the engine valve; in the above-mentioned "open" position, connecting rod one and connecting rod two are located on the same axis On the other hand, the end face 2 of the driving piston is close to the engine valve.

Further, a fluid channel is provided in the box, and the fluid channel connects the starting piston hole with the oil fluid network of the engine. The pressure of the oil acts on the non-guide groove end of the starting piston in the starting piston hole, and the starting piston is Push connecting rod one and connecting rod two from the "off" position to the "open" position along the guide groove in the box.

Further, a part of the end surface of the starting piston is recessed inward along the axial direction of the starting piston to form a guide groove, and the guide groove penetrates the starting piston along the radial direction of the starting piston.

Further, the bottom of the guide groove is provided with an arcuate surface matching the second end of the connecting rod one and the first end of the connecting rod two and both sides of the arcuate surface. A limiting surface is provided, and the arc-shaped surface abuts the connecting rod one and/or the connecting rod two and moves the connecting rod one and the connecting rod two between the two limiting surfaces. The "off" position is pushed toward the "on" position.

Further, the auxiliary valve driving mechanism also includes a connecting rod positioning mechanism, and the connecting rod positioning mechanism enables connecting rod one and connecting rod two to be located on the same axis when they are in the "open" position.

Further, the link positioning mechanism includes a hollow cylinder, and one end surface of the hollow cylinder is in contact with connecting rod one and connecting rod two in the "open" position.

Furthermore, the auxiliary valve driving mechanism also includes a return mechanism, which pushes connecting rod one and connecting rod two from the "open" position to the "closed" position along the guide groove in the box.

Further, the return mechanism includes a return spring and a return piston, and the return spring acts on the connecting rod through the return piston.

Further, the auxiliary valve driving mechanism also includes a driving piston spring, and the driving piston spring acts on the driving piston so that there is a gap between the end surface of the driving piston and the end surface of the second end of the connecting rod. The rotating pairs are always connected.

Further, the three rotating pairs are all spherical rotating pairs.

Further, the box body is provided with a valve gap adjustment screw, and the bottom surface of the valve gap adjustment screw cooperates with the end surface of a first end of the connecting rod to form a rotating pair.

Further, the box is the rocker arm of the engine.

Further, the box is the valve bridge of the engine.

Compared with the prior art, the effect of the present invention is positive and obvious. The invention can be integrated with the engine, thereby reducing the height, volume and weight of the engine; it does not need to use a hydraulic control valve, which reduces the cost and reaction time; it does not use liquid bearing and does not cause problems caused by high oil pressure and high oil temperature. Leakage, deformation and load fluctuation, the valve lift is not affected by oil temperature, oil pressure and air content, the valve lift can be designed to obtain a smaller value and reduce the gap between the engine piston and the valve. In addition, the connecting rod's ball head and the inner piston are in line contact, which is better than the traditional point contact, improving the reliability and durability of the mechanism. In the present invention, one end of the starting piston is provided with a guide groove, which not only allows the connecting rods one and two to make planar motion along the guide groove between the "off" position and the "open" position, but also allows the connecting rods one and two to be extended. /or the service life of connecting rod two.

Description of the drawings

Figure 1 is a schematic diagram of a box of the auxiliary valve driving mechanism embodiment of the present invention.

Figure 2 is a schematic diagram of the auxiliary valve driving mechanism embodiment of the present invention when it is in the "off" position.

Figure 3 is a schematic diagram of the auxiliary valve driving mechanism embodiment of the present invention when it is in the "open" position.

Figure 4 is a cross-sectional view of a starting piston of the auxiliary valve driving mechanism embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so that the purpose, features and advantages of the present invention can be more clearly understood. It should be understood that the embodiments shown in the drawings do not limit the scope of the present invention, but are only used to illustrate the essential spirit of the technical solution of the present invention.

In the following description, for the purpose of explaining the various disclosed embodiments, certain specific details are set forth in order to provide a thorough understanding of the various disclosed embodiments. However, one skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other instances, well-known devices, structures, and techniques associated with the present application may not be shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of "in one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Additionally, specific features, structures, or characteristics may be combined in any manner in one or more embodiments.

In the following description, in order to clearly demonstrate the structure and working mode of the present invention, many directional words will be used to describe it, but "front", "back", "left", "right", "outside", "inside" should be used for description. ”, “outward”, “inward”, “up”, “down” and other words are to be understood as convenient terms and should not be understood as limiting terms.

As shown in Figures 1, 2 and 3, an auxiliary valve driving mechanism 100 of the present invention includes a box 210 (the box shown in Figure 1 is a part of the engine rocker arm, and the rocker arm is assembled on the rocker arm of the engine through a hole 212. on the arm shaft (not shown)), connecting rods (Figures 2 and 3 include connecting rod one 184 and connecting rod two 186), starting piston 162 and driving piston 130. The box 210 is provided with a starting piston hole 260 and a driving piston hole 190 that are vertically intersecting. The starting piston hole 260 is provided with a starting piston 162 , and the driving piston hole 190 is provided with a driving piston 130 . The end surface of the first end of connecting rod 184 is connected to the box 210 (shown here is the adjusting screw 110 fixed on the box 210) through the rotating pair 122, and the end surface of the second end of connecting rod 184 is connected with the box 210 (shown here is the adjusting screw 110 fixed on the box 210). The end surface of the first end of connecting rod two 186 is connected by the rotating pair 125. A rotating pair 128 is provided between the end surface of the second end of connecting rod 186 and the end surface one (upper surface) of the driving piston 130. The end surface two of the driving piston 130 (Bottom surface) 131 is located above the engine valve (not shown).

The three rotating pairs 122, 125 and 128 shown in this embodiment are all spherical rotating pairs (the ball head and the ball socket cooperate). The rotating pair 125 is used for explanation. The implementation of the rotating pairs 122 and 128 can be referred to the rotating pair 125. Referring to Figure 2, the ball head of the rotating pair 125 is arranged on the connecting rod 184 and the ball socket of the second rotating pair 125 is arranged on the connecting rod. 2 186; In other embodiments, the ball socket of the rotating pair 125 can also be provided on the connecting rod 184 and the ball head of the rotating pair 125 can also be provided on the connecting rod 2 186; in other embodiments, the rotating pair 125 can also be provided on the connecting rod 184. It includes two ball sockets and a ball head arranged between the two ball sockets, wherein the two ball sockets are respectively arranged on connecting rod one 184 and connecting rod two 186.

One end 134 of the starting piston 162 is provided with a guide groove 137 (see Figures 2, 3 and 4). The width of the guide groove 137 is equal to or slightly larger than the connecting rods 184 and 186 (the diameters of connecting rod one and connecting rod two are the same). The second end of connecting rod one 184 and the first end of connecting rod two 186 are located in the guide groove. They form a plane along the guide groove 137 between the "off" position (Fig. 2) and the "open" position (Fig. 3). first plane) motion. In the "off" position, the return spring 156 of the return mechanism pushes the connecting rod one 184 and the connecting rod two 186 along the guide groove 137 to the "off" inclined position through the return piston (or push rod) 188 (Fig. 2, connecting rod one 184 and connecting rod 186 form an included angle), the starting piston 162 is pushed against the bottom surface 246 of the starting piston hole 260 (Fig. 1). At the same time, the driving piston spring 177 causes the driving piston 130 to move upward, and its bottom surface (end surface 2) 131 is separated from the engine valve (not shown).

It should be noted:

First, Figure 4 is a cross-sectional view of a starting piston of the auxiliary valve driving mechanism embodiment of the present invention, in which the plane of the cross-section is perpendicular to the first plane.

Second, referring to FIG. 4 , the width of the guide groove 137 refers to the distance between the upper and lower sides of the guide groove 137 .

In the prior art, the guide groove is not located at the starting piston, causing connecting rod one and/or connecting rod two to directly contact the end face of the starting piston. That is to say, when the starting piston exerts a strong force on connecting rod one and/or connecting rod two, When , connecting rod one and/or connecting rod two are in point contact with the starting piston, and the force between connecting rod one and/or connecting rod two and the starting piston is relatively large, so that connecting rod one and/or connecting rod two are in Easily damaged during use. For example, referring to FIG. 2 , assuming that the starting piston 162 is not provided with the guide groove 137 , when the starting piston 162 exerts a strong force on the connecting rods one and two, the ball head of the connecting rod 184 is in point contact with the end surface of the starting piston 162 , thus making the connecting rod easily damaged.

Through the design of the present invention, a guide groove is provided at the starting piston, which not only allows connecting rod one and connecting rod two to make planar motion along the guide groove between the "off" position and the "open" position, but also allows the connecting rod to be extended. The service life of connecting rod one and/or connecting rod two.

In one embodiment of the present invention, referring to Figures 2, 3 and 4, a portion of the end surface of the starting piston 162 is recessed inward along the axial direction of the starting piston 162 to form a guide groove 137, and the guide groove 137 is formed along the axial direction of the starting piston 162. The radial direction of 162 extends through the actuating piston 162 .

Through this design, the opening of the guide groove is located on the end face of the starting piston, which is easy to process and allows connecting rods one and two to make planar motion along the guide groove between the "off" position and the "open" position.

In one embodiment of the present invention, referring to Figures 2, 3 and 4, the bottom of the guide groove 137 is provided with an arc that matches the second end of the connecting rod 184 and the first end of the connecting rod 2 186. Limiting surfaces 1372 are provided on both sides of the surface 1371 and the arcuate surface 1371. The arcuate surface 1371 abuts the first connecting rod 184 and/or the second connecting rod 186 and places the first connecting rod 184 and the second connecting rod 186 at two limiting positions. The surface 1372 is pushed from the "off" position to the "on" position.

Through such a design, when the starting piston exerts a strong effect on connecting rod one and/or connecting rod two, connecting rod one And/or connecting rod two is in line contact with the starting piston. It can be understood that connecting rod one and/or connecting rod two is in line contact with the arc surface. Compared with the point contact in the prior art, connecting rod one can be extended. and/or the service life of connecting rod two.

It should be noted that, with reference to Figure 2, Figure 3 and Figure 4:

First, in this embodiment, the diameters of connecting rod one 184 and connecting rod two 186 are the same or substantially the same. The second end of connecting rod one 184 includes a ball head, and the first end of connecting rod two 186 includes a ball socket. The curved surface 1371 matches the ball head and the ball socket. When the curved surface 1371 pushes the connecting rod one 184 and the connecting rod two 186 from the "off" position to the "open" position, in the initial stage, the curved surface 1371 matches the ball head. There is a force effect between the arc surface 1371 and the connecting rod 184. When it is about to reach the "open" position, the arc surface 1371 may interact with the connecting rod 184 and the connecting rod 2. 186 all have the effect of force. In other embodiments, the ball head may be located at the second end of connecting rod 2 186 , and the force relationship may be referred to above, which will not be described again here. In other embodiments, those skilled in the art can know that when there are simple modifications to the mechanical connection method, the force relationship between the arc surface 1371 and the first connecting rod 184 and the second connecting rod 186 is also slightly different, but the arc surface 1371 The function of the surface 1371 remains unchanged, that is, when the pressure of the engine oil acts on the non-guide groove end of the starting piston 162 in the starting piston hole 260, the arc surface 1371 of the guide groove 137 in the starting piston 162 is in contact with the connecting rod 184 and/or Or the second connecting rod 186 has a force, and the connecting rod 184 and the second connecting rod 186 are pushed from the "off" position to the "open" position along the guide groove 137 in the box.

Second, the distance between the two limiting surfaces 1372 is the width of the guide groove 137 mentioned above.

When the auxiliary valve driving mechanism 100 needs to be started, the engine oil fluid network (not shown) supplies oil to the starting piston hole 260 through the fluid channel 214 provided in the box (rocker arm) 210 (see Figure 1), and the pressure of the engine oil The non-guide groove end 139 of the starting piston 162 overcomes the force of the return spring 156 and the driving piston spring 177, and pushes the first connecting rod 184 and the second connecting rod 182 along the guide groove 137 from the "off" inclined position to the "open" position. ” position (see the “stand straight” position in Figure 3). In the "open" position, connecting rod one 184 and connecting rod two 186 are located on the same axis, driving the piston 130 to move downward, and its bottom surface (end surface two) 131 is close to the engine valve (not shown).

The auxiliary valve driving mechanism 100 of the present invention also includes a connecting rod positioning mechanism to ensure that the first connecting rod 184 and the second connecting rod 186 are located on the same axis when in the "open" position (see Figure 3). The connecting rod positioning mechanism includes a hollow cylinder 164 (a screw plug is shown here). An end surface 146 of the hollow cylinder 164 is in contact with connecting rod one 184 and connecting rod two 186 in the "open" position. The hollow cylinder 164 contains a return mechanism, and its inner hole 144 guides the return piston 188 .

The adjusting screw 110 installed on the box 210 is used to adjust the position of the driving piston 130 in the driving piston hole. The upper and lower initial positions (valve clearance) within 190 degrees. For situations where there is no need to adjust the initial position of the drive piston 130, the adjustment screw 110 is not needed. At this time, the rotating pair 122 is directly formed between the end surface of the first end of the connecting rod 184 and the box (rocker arm) 210 .

The working process of this embodiment is: when the auxiliary valve driving mechanism 100 needs to work, the engine valve driving control mechanism (not shown) opens the oil supply, and the oil passes through the engine oil fluid network (not shown) and passes through the box (rocker arm) The fluid channel 214 in 210 supplies oil to the starting piston hole 260 (see Figure 1). The pressure of the engine oil acts on the starting piston 162 (the end face 139 bears the oil pressure), overcoming the force of the driving piston spring 177 and the return spring 156, and the Link one 184 and link two 182 are pushed from the "off" position (inclined, angled position in Figure 2) to the "open" position (coaxial, upright position in Figure 3) along the guide groove 137, and connect with link two The driving piston 130 connected to the bottom of 186 changes from the retracted position to the extended position, and its bottom surface (end surface two) 131 is close to (connected to) the engine valve below, and the valve driving mechanism 100 switches from the non-operating position to the operating position. At this time, the movement of the engine cam (not shown) is transmitted to the engine valve through the rocker arm 210 and the valve driving mechanism 100 in the operating position in the rocker arm to generate required auxiliary valve movement, such as for engine braking. Valve movement.

When the auxiliary valve driving mechanism 100 is not required to operate, the engine brake control mechanism is closed to unload oil, and the starting piston 162 is not subject to oil pressure, returns under the action of the return spring 156 and the driving piston spring 177, and stops at the starting piston hole 260 on the bottom surface 246. Connecting rod one 184 and connecting rod two 186 change from the upright position to the inclined position. The driving piston 130 retracts upward in the vertical hole 190 under the action of the driving piston spring 177, and its bottom surface (end surface two) 131 is in contact with the lower surface. The engine valves are separated, resulting in a certain spacing, so that the movement of the engine cam (not shown) is skipped and cannot be transmitted to the engine valves, and no auxiliary valve movement is generated.

The embodiments of the present invention illustrate the present invention but do not limit it. In fact, it will be apparent to those skilled in the art that modifications and variations of the present invention can be made within the scope and principles of the invention. For example, a certain part of the functions clarified or described by a specific organization can be used in another specific organization, thereby resulting in a new organization. The box in the embodiment can be not only a rocker arm, but also a valve bridge or even a fixed box. In addition, in addition to being spherical, the rotating pairs formed between connecting rod one and the box (adjusting screw), between connecting rod one and connecting rod two, and between connecting rod two and the driving piston can also be cylindrical or cylindrical. Other links. There are also different ways of guiding and positioning the connecting rods. In addition to generating valve motion for engine braking, the auxiliary valve driving mechanism of the present invention can also generate other types of variable valve motion. Accordingly, the present invention is intended to include the modifications and variations described above insofar as they fall within the scope of the appended rights. within the scope of the power required or equivalent to the power required.

The preferred embodiments of the present invention have been described in detail above, but it should be understood that those skilled in the art can make various changes or modifications to the present invention after reading the above teaching content of the present invention. These equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

An auxiliary valve driving mechanism includes a box, a connecting rod, a starting piston and a driving piston. The box is provided with a starting piston hole and a driving piston hole that intersect vertically, and the starting piston is provided in the starting piston hole. , the driving piston is provided in the driving piston hole, the connecting rod includes connecting rod one and connecting rod two, the first end surface of the connecting rod one is connected to the box through a rotating pair, the The second end face of connecting rod one and the first end face of connecting rod two are connected through a rotating pair, and a rotating pair is provided between the second end face of connecting rod two and the first end face of the driving piston. The second end face of the driving piston is located above the engine valve, and is characterized in that: one end of the starting piston is provided with a guide groove, the second end of the connecting rod one and the first end of the connecting rod two Located in the guide groove, the connecting rod one and the connecting rod two make planar motion along the guide groove between the "off" position and the "open" position. In the "off" position, the Connecting rod one and connecting rod two form an included angle, and end face two of the driving piston is away from the engine valve; in the "open" position, connecting rod one and connecting rod two Located on the same axis, the end surface two of the driving piston is close to the engine valve.
The auxiliary valve driving mechanism according to claim 1, characterized in that: a fluid channel is provided in the box, and the fluid channel connects the starting piston hole to the engine oil fluid network, and the pressure of the oil acts on the engine oil fluid network. The end of the starting piston in the starting piston hole that is not the guide groove, the starting piston moves the connecting rod one and the second connecting rod from the "off" position along the guide groove in the box. position is pushed toward the "on" position.
The auxiliary valve driving mechanism according to claim 1, wherein a part of the end surface of the starting piston is recessed inward along the axial direction of the starting piston to form a guide groove, and the guide groove is formed along the axial direction of the starting piston. The radial direction runs through the starting piston.
The auxiliary valve driving mechanism according to claim 1, characterized in that: the bottom of the guide groove is provided with a structure matching the second end of the connecting rod one and the first end of the connecting rod two. The arc-shaped surface and the limiting surfaces are provided on both sides of the arc-shaped surface. The arc-shaped surface is in contact with the connecting rod one and/or the connecting rod two and connects the connecting rod one and the connecting rod. Rod two is pushed from the "off" position to the "open" position between the two limiting surfaces.
The auxiliary valve driving mechanism according to claim 1, characterized in that: the auxiliary valve driving mechanism further includes a connecting rod positioning mechanism, and the connecting rod positioning mechanism makes the connecting rod one and the connecting rod two The "open" position is located on the same axis.
The auxiliary valve driving mechanism according to claim 5, characterized in that: the connecting rod positioning mechanism includes a hollow cylinder, and an end surface of the hollow cylinder is in contact with the connecting rod in the "open" position. One is in contact with the connecting rod two.
The auxiliary valve driving mechanism according to claim 1, characterized in that: the auxiliary valve driving mechanism further includes a return mechanism, and the return mechanism moves the connecting rod one and the connecting rod two in the box. The body is pushed from the "open" position to the "closed" position along the guide groove.
The auxiliary valve driving mechanism according to claim 7, wherein the return mechanism includes a return spring and a return piston, and the return spring acts on the connecting rod through the return piston.
The auxiliary valve driving mechanism according to claim 1, characterized in that: the auxiliary valve driving mechanism further includes a driving piston spring, and the driving piston spring acts on the driving piston so that the end surface of the driving piston The rotating pair between one and the second end surface of the connecting rod two is always connected.
The auxiliary valve driving mechanism according to claim 1, characterized in that: the three rotating pairs are all spherical rotating pairs.
The auxiliary valve driving mechanism according to claim 1, characterized in that: a valve gap adjustment screw is provided on the box, and the bottom surface of the valve gap adjustment screw and the first end of the connecting rod one The surfaces cooperate to form a rotating pair.
The auxiliary valve driving mechanism according to claim 1, wherein the box is a rocker arm of the engine.
The auxiliary valve driving mechanism according to claim 1, wherein the box is a valve bridge of the engine.