Cylinder device and reciprocating piston internal combustion engine

Abstract

The invention provides an air cylinder device which comprises an air cylinder, an air valve mechanism and an air valve driving mechanism. A cylinder cover of the cylinder is arranged on the cylinder body and is provided with a vent; the valve mechanism comprises a valve, an adjusting sleeve, a seat ring and a first reset elastic piece. The valve rod part extends in the first direction and penetrates through the cylinder cover, the inner end part of the rod part is located in the cylinder cover, the valve head part is connected to the inner end part, the outer end part of the rod part extends out of the outer side of the cylinder cover, and the rod part and the cylinder cover are relatively positioned in the circumferential direction and can relatively move in the first direction; the adjusting sleeve is positioned on the outer side of the cylinder cover and is coaxial with the rod part; the adjusting sleeve is driven by an adjusting driving mechanism to rotate around a central shaft; the seat ring is arranged in a sleeve cavity of the adjusting sleeve, the outer end of the seat ring penetrates through the center of the seat ring and is in threaded fit with the seat ring, and the seat ring and the adjusting sleeve are relatively positioned in the circumferential direction and can relatively move in the first direction. The first reset elastic piece is connected between the seat ring and the cylinder cover; the valve driving mechanism is used for driving the seat ring to move in the first direction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reciprocating piston internal combustion engine, and particularly relates to a cylinder device and a reciprocating piston internal combustion engine. BACKGROUND

[0002] For the reciprocating piston internal combustion engine for automobile, the cam profile of the camshaft and the structure of the valve drive mechanism are fixed, which leads to the fixed and unchangeable variation law of the valve lift curve relative to the crank angle. The working condition range of the internal combustion engine for automobile is relatively large, the rotating speed varies sharply, the highest rotating speed can reach ten thousand revolutions, and the lowest rotating speed is only several hundred revolutions. The fixed valve lift curve can only achieve the optimal intake and exhaust performance under the condition of a certain rotating speed of the internal combustion engine, and the lift curve cannot make the engine obtain good response in the high speed area or the low speed area. The cam profile design is the balance selection of the engine in the whole working condition. As a result, the engine cannot obtain the best high speed efficiency and the best low speed torque.

[0003] In order to realize different valve lifts, some existing schemes adopt the design of variable valve lift, which can make the engine obtain the valve lift meeting the demand in the high speed area and the low speed area according to the variation of the rotating speed of the internal combustion engine, so as to improve the high speed power and the low speed torque of the engine. However, the existing variable valve lift scheme adopts the hydraulic form to realize the lift adjustment, and the hydraulic system has high requirements. When the temperature and quality of the hydraulic oil change, the accuracy of the valve lift control will be directly affected, and it is difficult to realize the precise control of the valve lift. SUMMARY

[0004] One main purpose of the present application is to overcome at least one defect of the prior art, and provide a cylinder device with high accuracy of valve lift adjustment function.

[0005] In order to achieve the above purpose, the present application adopts the following technical scheme:

[0006] According to one aspect of the present application, there is provided a cylinder device, wherein the cylinder device is configured to be installed in a reciprocating piston internal combustion engine, the cylinder device comprising a cylinder, a valve mechanism, and a valve drive mechanism; the cylinder comprising a cylinder body and a cylinder head; the cylinder head is arranged on the cylinder body and has a port communicating with an inner cavity of the cylinder body; the valve mechanism comprising a valve, a regulating sleeve, a seat ring, and a first reset elastic member; the valve comprising a stem and a head, the stem extends in a first direction and is arranged in the cylinder head, two ends of the stem in the first direction are respectively an inner end and an outer end, the inner end is located in the cylinder head, the head is connected to the inner end and is located at the port, the outer end extends out of the cylinder head to the outside of the cylinder body, the stem is configured to be positioned opposite to the cylinder head in a circumferential direction and can be relatively displaced in the first direction; the regulating sleeve is located outside the cylinder head and is coaxially arranged with the stem, the regulating sleeve is driven by a regulating drive mechanism to rotate around a central axis; the seat ring is arranged in a barrel cavity of the regulating sleeve, and the outer end is arranged at the center of the seat ring and is threadedly connected, the seat ring is configured to be positioned opposite to the regulating sleeve in a circumferential direction and can be relatively displaced in the first direction; the first reset elastic member is connected between the seat ring and the cylinder head; the valve drive mechanism is configured to drive the seat ring to move in the first direction relative to the cylinder head, thereby driving the valve to move in the first direction relative to the cylinder head to open the port.

[0007] According to one of the embodiments of the present application, a limiting guide pipe is arranged on the cylinder head, the limiting guide pipe extends in the first direction, and the stem is partially arranged in the limiting guide pipe; wherein the outer periphery of the stem is provided with a first key groove extending in the first direction, the inner periphery of the limiting guide pipe is provided with a second key groove extending in the first direction, the first key groove and the second key groove are arranged opposite to each other, and the first key groove and the second key groove are jointly provided with a ball.

[0008] According to one of the embodiments of the present application, wherein: the outer periphery of the stem is provided with at least two first key grooves, the inner periphery of the limiting guide pipe is provided with at least two second key grooves, the number of the first key grooves and the second key grooves is equal and arranged one-to-one, and the at least two first key grooves are arranged uniformly spaced apart on the outer periphery of the stem; and / or, for at least one set of the first key groove and the second key groove arranged opposite to each other, at least two balls are jointly arranged, and the at least two balls are arranged in the first direction.

[0009] According to one of the embodiments of the present application, the cylinder head is provided with a mounting hole extending in the first direction, and the limiting guide pipe is arranged in the mounting hole; wherein the outer periphery of the limiting guide pipe is provided with a first limiting groove, the inner periphery of the mounting hole is provided with a second limiting groove, the first limiting groove and the second limiting groove are arranged oppositely, and the first limiting groove and the second limiting groove are jointly provided with a positioning pin block.

[0010] According to one of the embodiments of the present application, one of the inner periphery of the adjusting sleeve and the outer periphery of the seat ring is provided with a third key groove extending in the first direction, and the other is provided with a spline, the spline is accommodated in the third key groove and can slide in the third key groove in the first direction.

[0011] According to one of the embodiments of the present application, one of the inner periphery of the adjusting sleeve and the outer periphery of the seat ring is provided with at least two third key grooves, and the other is provided with at least two splines, the number of the third key grooves and the splines are equal and arranged one-to-one, and the at least two third key grooves are arranged uniformly spaced apart on the inner periphery of the adjusting sleeve or the outer periphery of the seat ring.

[0012] According to one of the embodiments of the present application, the outer periphery of the adjusting sleeve is provided with a worm gear tooth, and the adjusting driving mechanism comprises an adjusting driving member and a worm, the adjusting driving member is in transmission connection with the worm, and the worm is matched with the worm gear tooth.

[0013] According to one of the embodiments of the present application, wherein: the first reset elastic member has a first end connected to the cylinder head, the side surface of the cylinder head facing the adjusting sleeve is provided with a fitting groove, and the first end is accommodated and connected to the fitting groove; and / or, the first reset elastic member has a second end connected to the seat ring, and the second end is connected to the seat ring via a bearing, so that the first reset elastic member can rotate relative to the seat ring.

[0014] According to one of the embodiments of the present application, the valve drive mechanism comprises a valve drive element, a transmission shaft, a rocker arm and a pivot shaft, the valve drive element is in transmission connection with the transmission shaft, a cam is arranged on the transmission shaft, the cam is correspondingly arranged at one end of the rocker arm, the other end of the rocker arm is located on the side of the race away from the cylinder head, the pivot shaft is arranged at the middle part of the rocker arm, and a second reset elastic element is arranged on the pivot shaft; wherein the valve drive mechanism is configured to drive the transmission shaft to rotate by the valve drive element, drive the cam to rotate, when the cam rotates to abut the one end of the rocker arm with the convex part thereof, the other end of the rocker arm abuts against the race and drives the valve to move towards the cylinder head along the first direction, and when the cam rotates to correspond to the one end of the rocker arm with the base circle part thereof, the other end of the rocker arm is separated from the race by reversely swinging under the action of the second reset elastic element.

[0015] From the above technical solution, the valve mechanism of the cylinder device provided by the present application has the following advantages and positive effects:

[0016] The valve mechanism of the cylinder device provided by the present application comprises a valve, an adjusting sleeve, a race and a first reset elastic element; the valve rod part extends along the first direction and is arranged through the cylinder head, the inner end part of the rod part is located in the cylinder head, the head part of the valve is connected to the inner end part, the outer end part of the rod part extends out of the outer side of the cylinder head, the rod part and the cylinder head are positioned opposite to each other in the circumferential direction and can relatively displace along the first direction; the adjusting sleeve is located on the outer side of the cylinder head and is coaxially arranged with the rod part, the adjusting sleeve is driven by an adjusting drive mechanism to rotate around the central shaft; the race is arranged in the cylinder cavity of the adjusting sleeve, and the outer end part is arranged through the center of the race and is in threaded cooperation, the race and the adjusting sleeve are positioned opposite to each other in the circumferential direction and can relatively displace along the first direction; the first reset elastic element is connected between the race and the cylinder head; the valve drive mechanism is used to drive the race to move along the first direction. Through the above design, by using the above positioning and action cooperation relationship of the rod part and the cylinder head, the race and the adjusting sleeve, the present application can drive the adjusting sleeve to rotate by the adjusting drive mechanism and drive the race to synchronously rotate, since the race is in threaded cooperation with the outer end part of the rod part and the rod part and the cylinder head are positioned opposite to each other in the circumferential direction, the rotation torque of the race will act on the threaded cooperation with the valve, so that the race relatively displaces along the first direction relative to the valve, so as to realize the adjustment of the initial position of the race, that is, the function of variable valve lift is realized. Compared with the existing scheme of realizing lift adjustment in the form of hydraulic pressure, the present application uses the above mechanical adjustment scheme, reduces the design requirements for the hydraulic drive part, and can improve the control stability and accuracy of the valve lift adjustment function.

[0017] Another main purpose of the present application is to overcome at least one of the defects of the above-mentioned prior art, and to provide a reciprocating piston internal combustion engine using the above-mentioned cylinder device.

[0018] To achieve the above object, the present application adopts the following technical solution:

[0019] According to another aspect of the present application, there is provided a reciprocating piston internal combustion engine, wherein the cylinder device according to the present application is included.

[0020] From the above technical solution, the reciprocating piston internal combustion engine according to the present application has the following advantages and positive effects:

[0021] The reciprocating piston internal combustion engine according to the present application can realize the variable valve lift function and improve the control stability and accuracy of the valve lift adjustment function by using the cylinder device according to the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] The various objects, features and advantages of the present application will become more apparent from the following detailed description of preferred embodiments of the application when considered in conjunction with the drawings. The drawings are not necessarily to scale, and the like reference numerals designate corresponding similar items in the various figures. In the drawings:

[0023] Figures 1 to 3 are sectional views of partial structures of the cylinder device in several different states according to an exemplary embodiment;

[0024] Figure 4 is a plan view of the adjusting sleeve of the cylinder device and the adjusting drive mechanism;

[0025] Figure 5 is a plan view of the seat ring of the cylinder device;

[0026] Figure 6 is a cross-sectional view of the rod portion of the valve and the limiting guide tube at the first key groove.

[0027] The reference numerals are explained as follows:

[0028] 110. cylinder head; 224. adjusting drive member;

[0029] 111. air passage; 230. seat ring;

[0030] 112. mounting hole; 231. spline;

[0031] 1121. positioning pin block; 232. threaded hole;

[0032] 113. assembly groove; 240. first return elastic member;

[0033] 210. valve; 241. bearing;

[0034] 211. stem; 300. valve drive mechanism;

[0035] 2111. outer end; 310. drive shaft;

[0036] 21111. external thread; 311. cam;

[0037] 2112. first keyway; 320. rocker arm;

[0038] 212. head; 330. pivot;

[0039] 220. adjustment sleeve; 340. second return spring;

[0040] 221. worm; 400. limit guide tube;

[0041] 222. third keyway; 410. second keyway;

[0042] 223. worm gear tooth; 420. ball;

[0043] X. first direction. DETAILED DESCRIPTION

[0044] Embodiments that incorporate the principles and advantages of the present application will be described in detail hereinafter. It should be appreciated that the present application can be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0045] In the following description of various example embodiments of the present application, reference is made to the accompanying drawings that form a part hereof, and in which are shown by way of illustration various example structures, systems, and steps in which aspects of the present application can be practiced. It is to be understood that other specific arrangements of parts, structures, example devices, systems, and steps can be utilized and structural and functional modifications can be made without departing from the scope of the present application. Also, while the terms "top," "bottom," "front," "back," and the like can be used in this specification to describe various example features and elements of the present application, these terms are used herein as a shorthand notation, and in no way limit or restrict the scope of the application described herein to a particular orientation in space. Any language in this specification that might be claimed to describe a spatial relationship should be taken to be conditioned on the location in space described herein for the feature or element, and not any absolute relationship in space.

[0046] Reference is made to Figure 1Fig. 1 is a cross-sectional view that representatively shows part of the structure of the cylinder device according to the present application, in which the cross-sectional structure of the cylinder device is specifically shown when the valve 210 is in an open state (i.e. the head 212 of the valve 210 does not block the air passage 111 of the cylinder head 110), and the structure of the cylinder body and other structures are hidden. In this exemplary embodiment, the cylinder device according to the present application is described by taking the application to a reciprocating piston internal combustion engine for a vehicle as an example. It is easy for those skilled in the art to understand that various modifications, additions, substitutions, deletions or other changes can be made to the following detailed description in order to apply the relevant design of the present application to other types of reciprocating piston internal combustion engines, and these changes are still within the scope of the principle of the cylinder device according to the present application.

[0047] As shown in Figure 1 , in an embodiment of the present application, the cylinder device according to the present application is applied to a reciprocating piston internal combustion engine, and the cylinder device comprises a cylinder, a valve mechanism and a valve drive mechanism 300. For reference, see Figures 2 to 6 , Figure 2 and Figure 3 , which representatively show cross-sectional views of part of the structure of the cylinder device in other states, in which, Figure 2 the cross-sectional structure of the cylinder device is specifically shown when the valve 210 is open in another stroke, Figure 3 the cross-sectional structure of the cylinder device is specifically shown when the valve 210 is closed in the stroke state shown in Figure 1 ; Figure 4 , which representatively shows a plan view of the adjusting sleeve 220 and the adjusting drive mechanism; Figure 5 , which representatively shows a plan view of the seat ring 230; Figure 6 , which representatively shows a cross-sectional view of the rod portion 211 of the valve 200 and the limiting guide pipe 400 at the first key groove 2112. The structure, connection mode and functional relationship of each main component of the cylinder device according to the present application will be described in detail below in combination with the above-mentioned drawings.

[0048] As shown in Figures 1 to 6As shown, in an embodiment of the present application, the cylinder includes a cylinder body and a cylinder head 110. The cylinder head 110 is arranged on the cylinder body, and the cylinder head 110 has a vent port 111 communicated with the inner cavity of the cylinder body. The valve mechanism includes a valve 210, an adjusting sleeve 220, a seat ring 230, and a first reset elastic member 240. The valve 210 includes a stem 211 and a head 212. The stem 211 extends along a first direction X and is arranged in the cylinder head 110. The stem 211 has two ends in the first direction X, i.e., an inner end and an outer end 2111. The inner end is located in the cylinder head 110, and the head 212 is connected to the inner end and located at the vent port 111. The outer end 2111 extends out of the cylinder head 110 and is located on the outer side of the cylinder body. The stem 211 of the valve 210 is circumferentially positioned relative to the cylinder head 110, and the stem 211 and the cylinder head 110 can be relatively displaced along the first direction X. The adjusting sleeve 220 is arranged on the outer side of the cylinder head 110 and coaxially arranged with the stem 211. The adjusting sleeve 220 has a sleeve cavity penetrating through two sleeve ports at its two ends in the first direction X. The adjusting sleeve 220 is driven by an adjusting drive mechanism to rotate around the central axis. The seat ring 230 is arranged in the sleeve cavity of the adjusting sleeve 220, and the outer end 2111 of the stem 211 is arranged in the center of the seat ring 230 and threadedly matched, for example, the outer periphery of the outer end 2111 is provided with an external thread 21111, and the center of the seat ring 230 is provided with a threaded hole 232. The outer end 2111 is threadedly matched with the threaded hole 232 via the external thread 21111. The seat ring 230 is circumferentially positioned relative to the adjusting sleeve 220, and the seat ring 230 and the adjusting sleeve 220 can be relatively displaced along the first direction X. The first reset elastic member 240 is connected between the seat ring 230 and the cylinder head 110. The first reset elastic member 240 is used to drive the seat ring 230 to reset and drive the valve 210 to move when the seat ring 230 loses the driving force of the valve drive mechanism 300, so as to achieve the closing of the vent port 111. The valve drive mechanism 300 is used to drive the seat ring 230 to move relative to the cylinder head 110 along the first direction X, so as to drive the valve 210 to move relative to the cylinder head 110 along the first direction X and achieve the opening of the vent port 111.By the above design, by the above positioning and action cooperation relationship of the rod part 211 and the cylinder cover 110, the seat ring 230 and the adjusting sleeve 220, the adjusting sleeve 220 can be driven to rotate by the adjusting driving mechanism to drive the seat ring 230 to rotate synchronously, since the seat ring 230 is threadedly cooperated with the outer end part 2111 of the rod part 211 and the rod part 211 of the valve 210 is relatively positioned with the cylinder cover 110 in the circumferential direction, the torque of the seat ring 230 will be transmitted to the valve 210 through the thread cooperation, so that the seat ring 230 is displaced relative to the valve 210 in the first direction X, so as to realize the adjustment of the initial position of the seat ring 230, that is, the function of variable valve 210 lift, compared with the existing scheme of realizing the lift adjustment in the form of hydraulic pressure, the above mechanical adjustment scheme is used to reduce the design requirement of the hydraulic driving part, and the control stability and accuracy of the valve 210 lift adjustment function can be improved.

[0049] Specifically, as shown in Figure 1 and Figure 2 Comparing the structures shown in the two figures, it can be seen that when the valve 210 is adjusted to two different lifts, the size of the air gap between the head part 212 and the air port 111 of the valve 210 in the open state is different, thereby realizing the adjustment of the air volume, so that the corresponding valve 210 is adjusted to meet the air demand of the internal combustion engine in the high-speed region and the low-speed region, and the high-speed power and the low-speed torque of the internal combustion engine are improved. Among them, for Figure 1 and Figure 2 The relative positions of the seat ring 230 and the valve 210 (i.e. the outer end part 2111 of the rod part 211) in the first direction X change, and the relative positions of the adjusting sleeve 220 and the seat ring 230 in the first direction X do not change when the two different valve 210 lifts are in the open state or the closed state at the same time, accordingly, when the valve driving mechanism 300 drives the seat ring 230 to move relative to the adjusting sleeve 220 in the first direction X, the size of the air gap between the head part 212 and the air port 111 is different.

[0050] As shown in Figures 1 to 3As shown, in an embodiment of the present application, the cylinder device further comprises a limiting conduit 400. The limiting conduit 400 is arranged on the cylinder head 110, and extends along the first direction X, and a portion of the stem 211 of the valve 210 is arranged in the limiting conduit 400. On this basis, the outer periphery of the stem 211 can be provided with a first key groove 2112 extending along the first direction X, and the inner periphery of the limiting conduit 400 can be provided with a second key groove 410 extending along the first direction X, the first key groove 2112 and the second key groove 410 are arranged opposite to each other, and the first key groove 2112 and the second key groove 410 are jointly provided with a plurality of balls 420. Specifically, the first key groove 2112 can be arranged only on the outer periphery of a section of the stem 211, and the length of the first key groove 2112 along the first direction X can be only suitable for accommodating a plurality of balls 420. For example, a set of first key grooves 2112 and second key grooves 410 jointly provided with two balls 420 as shown in the drawings, the length of the first key groove 2112 along the first direction X can be equal to or slightly greater than twice the diameter of the ball 420, and during the relative sliding of the stem 211 and the limiting conduit 400 along the first direction X, the first key groove 2112 does not expose outside the two end openings of the limiting conduit 400, thereby avoiding the balls 420 from falling out. Furthermore, the second key groove 410 can extend through the limiting conduit 400 along the first direction X, in other words, the length of the second key groove 410 along the first direction X can be equal to the length of the limiting conduit 400, and in some embodiments, the length of the second key groove 410 can also be less than the length of the limiting conduit 400. Through the above design, the present application can realize the positioning of the valve 210 and the limiting conduit 400 in the circumferential direction by using the limiting effect of the balls 420 and the first key groove 2112 and the second key groove 410, that is, the valve 210 and the limiting conduit 400 cannot rotate relative to each other. At the same time, the present application can realize the sliding of the valve 210 and the limiting conduit 400 along the first direction X by using the rolling of the balls 420 in the second key groove 410.

[0051] As Figure 6As shown, based on the design of the first key groove 2112, the second key groove 410 and the ball 420 described above, in an embodiment of the present application, the outer periphery of the stem portion 211 of the valve 210 can be provided with at least two first key grooves 2112, for example but not limited to two as shown in the drawings. Correspondingly, the inner periphery of the limiting guide pipe 400 can be provided with at least two second key grooves 410, for example but not limited to two as shown in the drawings. In other words, the number of the first key groove 2112 and the second key groove 410 is at least two and equal. On this basis, the first key groove 2112 and the second key groove 410 are arranged one by one, and the at least two first key grooves 2112 are uniformly arranged at intervals on the outer periphery of the stem portion 211, that is, the at least two second key grooves 410 are uniformly arranged at intervals on the inner periphery of the limiting guide pipe 400. Through the above design, the present application can make the limiting and rolling guiding effect of the ball 420 on the limiting guide pipe 400 and the valve 210 more uniform, so that the relative displacement of the valve 210 and the limiting guide pipe 400 along the first direction X is more stable. In some embodiments, the stem portion 211 of the valve 210 can also be provided with only one first key groove 2112, and the inner periphery of the limiting guide pipe 400 can also be provided with only one second key groove 410, which is not limited to the present embodiment.

[0052] As shown, Figure 1 based on the design of the first key groove 2112, the second key groove 410 and the ball 420 described above, in an embodiment of the present application, for at least one set of oppositely arranged first key grooves 2112 and second key grooves 410, at least two balls 420 can be arranged together, for example but not limited to two as shown in the drawings, and the at least two balls 420 can be arranged along the first direction X. Through the above design, the present application can make the relative displacement of the valve 210 and the limiting guide pipe 400 along the first direction X more stable.

[0053] As shown, Figure 1 based on the design of the limiting guide pipe 400, in an embodiment of the present application, the cylinder head 110 can be provided with a mounting hole 112 extending along the first direction X, and the limiting guide pipe 400 is arranged in the mounting hole 112. On this basis, the outer periphery of the limiting guide pipe 400 can be provided with a first limiting groove, and the inner periphery of the mounting hole 112 can be provided with a second limiting groove, the first limiting groove and the second limiting groove are oppositely arranged, and the first limiting groove and the second limiting groove are provided with a positioning pin block 1121. Through the above design, the present application can use the positioning pin block 1121 to position the limiting guide pipe 400 and the cylinder head 110, so that they are relatively fixed, that is, it is ensured that the limiting guide pipe 400 and the cylinder cannot rotate relative to each other in the circumferential direction, and also cannot move relative to each other along the first direction X. In some embodiments, the limiting guide pipe 400 and the cylinder head 110 can also use other ways to realize the above positioning function, or the limiting guide pipe 400 can also be directly fixedly connected with the cylinder head 110, which are not limited to the above embodiments.

[0054] As shown in Figure 4 and Figure 5 , in an embodiment of the present application, the inner periphery of the adjusting sleeve 220 can be provided with a third key groove 222 extending along the first direction X, and the outer periphery of the race 230 can be provided with a spline 231 accommodated in the third key groove 222, that is, the spline 231 cooperates with the third key groove 222, so as to realize that the adjusting sleeve 220 and the race 230 can be relatively displaced along the first direction X, while limiting that the adjusting sleeve 220 and the race 230 cannot be relatively rotated along the circumferential direction. Specifically, the third key groove 222 can pass through the adjusting sleeve 220 along the first direction X, in other words, in the first direction X, the length of the third key groove 222 can be equal to the length of the adjusting sleeve 220, and in some embodiments, the length of the third key groove 222 can also be less than the length of the adjusting sleeve 220. Furthermore, in order to adapt to the sliding of the spline 231 in the third key groove 222 along the first direction X, the length of the spline 231 along the first direction X is less than the length of the third key groove 222, and since the thickness of the race 230 along the first direction X is less than the length of the adjusting sleeve 220, the length of the spline 231 along the first direction X can be equal to the thickness of the race 230, so as to simplify the structural complexity of the race 230 and facilitate the machining of the spline 231. In some embodiments, the length of the spline 231 along the first direction X can also be greater than, or less than, the thickness of the race 230. Through the above design, the present application can realize the positioning of the adjusting sleeve 220 and the race 230 in the circumferential direction by using the limiting action of the third key groove 222 and the spline 231, that is, the adjusting sleeve 220 and the race 230 cannot be relatively rotated. At the same time, the present application can realize the relative displacement of the adjusting sleeve 220 and the race 230 along the first direction X by using the sliding of the spline 231 in the third key groove 222.

[0055] It should be noted that, in the embodiments shown in Figure 4 and Figure 5 , the adjusting sleeve 220 is provided with the third key groove 222 and the race 230 is provided with the spline 231. In some embodiments, the third key groove 222 can also be provided on the outer periphery of the race 230, and the spline 231 can also be provided on the inner periphery of the adjusting sleeve 220. In other words, in various possible embodiments consistent with the design concept of the present application, one of the inner periphery of the adjusting sleeve 220 and the outer periphery of the race 230 is provided with the third key groove 222, and the other is provided with the spline 231, which is not limited to the above embodiments.

[0056] As shown in Figure 4 and Figure 5As shown, based on the design of the third key groove 222 and the spline 231, in an embodiment of the present application, the inner periphery of the adjusting sleeve 220 (or the outer periphery of the seat ring 230) can be provided with at least two third key grooves 222, for example but not limited to four as shown in the drawings, and correspondingly, the outer periphery of the seat ring 230 (or the inner periphery of the adjusting sleeve 220) can be provided with at least two splines 231, for example but not limited to four as shown in the drawings. In other words, the number of the third key groove 222 and the spline 231 is at least two and equal. On this basis, the third key groove 222 and the spline 231 are arranged one by one, and the at least two third key grooves 222 are uniformly arranged on the inner periphery of the adjusting sleeve 220 (or the outer periphery of the seat ring 230), that is, the at least two splines 231 are uniformly arranged on the outer periphery of the seat ring 230 (or the inner periphery of the adjusting sleeve 220). Through the above design, the present application can make the matching design of the spline 231 and the third key groove 222 more uniform for the limiting and sliding guiding effect of the adjusting sleeve 220 and the seat ring 230, so that the relative displacement of the adjusting sleeve 220 and the seat ring 230 along the first direction X is more stable. In some embodiments, the spline 231 and the third key groove 222 can also be only one group, which is not limited to the present embodiment.

[0057] As shown, Figure 4 In an embodiment of the present application, the outer periphery of the adjusting sleeve 220 can be provided with worm gear teeth 223. Correspondingly, the adjusting driving mechanism can include an adjusting driving member 224 and a worm 221, the adjusting driving member 224 being drivingly connected to the worm 221, and the adjusting driving member 224 can be, for example, a driving motor, and the worm 221 cooperates with the worm gear teeth 223. Accordingly, the present application drives the worm 221 to rotate by using the adjusting driving member 224, and drives the torque to change direction and transmit to the adjusting sleeve 220 by using the meshing relationship between the worm 221 and the worm gear teeth 223, so that the adjusting sleeve 220 rotates around the circumference, that is, rotates around the central axis extending along the first direction X. Through the above design, the present application can further realize the mechanical driving design of the valve 210 lift adjustment, and through the matching design of the worm 221 and the worm gear teeth 223, the present application can further improve the control stability and accuracy of the valve 210 lift adjustment function by precisely controlling the rotating action of the worm 221.

[0058] As shown, Figure 1As shown in the embodiment of the present application, the first reset elastic member 240 has a first end connected to the cylinder cover 110, and the side surface of the cylinder cover 110 facing the adjusting sleeve 220 can be provided with a fitting groove 113, and the first end can be accommodated and connected in the fitting groove 113. Through the above design, the present application can improve the connection effect of the first reset elastic member 240 and the cylinder cover 110, and can limit the first end of the first reset elastic member 240 in the axial direction by the fitting groove 113, further improving the structural stability.

[0059] As shown in the embodiment of the present application, the first reset elastic member 240 has a first end connected to the cylinder cover 110, and the side surface of the cylinder cover 110 facing the adjusting sleeve 220 can be provided with a fitting groove 113, and the first end can be accommodated and connected in the fitting groove 113. Through the above design, the present application can improve the connection effect of the first reset elastic member 240 and the cylinder cover 110, and can limit the first end of the first reset elastic member 240 in the axial direction by the fitting groove 113, further improving the structural stability. Figure 1 As shown in the embodiment of the present application, the first reset elastic member 240 has a second end connected to the seat ring 230, and the second end can be connected to the seat ring 230 through a bearing 241 (such as but not limited to a face bearing), so that the first reset elastic member 240 can rotate relative to the seat ring 230. Through the above design, since the present application adjusts the valve 210 lift by rotating the adjusting sleeve 220 and driving the seat ring 230 to rotate synchronously, by connecting the first reset elastic member 240 and the seat ring 230 in rotation, the present application can avoid the first reset elastic member 240 being twisted during the valve 210 lift adjustment, ensure the stability of the elastic reset function, and be beneficial to prolong the service life of the first reset elastic member 240.

[0060] As shown in the embodiment of the present application, the first reset elastic member 240 has a first end connected to the cylinder cover 110, and the side surface of the cylinder cover 110 facing the adjusting sleeve 220 can be provided with a fitting groove 113, and the first end can be accommodated and connected in the fitting groove 113. Through the above design, the present application can improve the connection effect of the first reset elastic member 240 and the cylinder cover 110, and can limit the first end of the first reset elastic member 240 in the axial direction by the fitting groove 113, further improving the structural stability. Figures 1 to 3 As shown in the embodiment of the present application, the first reset elastic member 240 can adopt a spiral spring, and the spiral spring is arranged around part of the rod portion 211 (part of the limiting conduit 400) of the valve 210. In some embodiments, the first reset elastic member 240 can also adopt other elastic structures, such as but not limited to a spring piece, a leaf spring, etc., and is not limited to the present embodiment.

[0061] As shown in the embodiment of the present application, the first reset elastic member 240 has a first end connected to the cylinder cover 110, and the side surface of the cylinder cover 110 facing the adjusting sleeve 220 can be provided with a fitting groove 113, and the first end can be accommodated and connected in the fitting groove 113. Through the above design, the present application can improve the connection effect of the first reset elastic member 240 and the cylinder cover 110, and can limit the first end of the first reset elastic member 240 in the axial direction by the fitting groove 113, further improving the structural stability. Figures 1 to 3As shown, in one embodiment of the present invention, the valve drive mechanism 300 may include a valve 210 drive member, a drive shaft 310, a rocker arm 320, and a rotating shaft 330. Specifically, the valve 210 drive member is drively connected to the drive shaft 310, and a cam 311 is provided on the drive shaft 310. The cam 311 is correspondingly arranged at one end of the rocker arm 320, and the other end of the rocker arm 320 is located on the side of the seat ring 230 facing away from the cylinder head 110. The rotating shaft 330 is located in the middle of the rocker arm 320, and a second reset elastic member 340 is provided on the rotating shaft 330. Accordingly, the valve drive mechanism 300 can drive the transmission shaft 310 to rotate through the valve 210 drive member, thereby causing the cam 311 to rotate. When the cam 311 rotates to the point where its own protrusion abuts against one end of the rocker arm 320, the other end of the rocker arm 320 presses against the seat ring 230 and drives the valve 210 to move toward the cylinder head 110 along the first direction X. When the cam 311 rotates to the point where its own base circle corresponds to one end of the rocker arm 320, the rocker arm 320 swings in the opposite direction under the action of the second reset elastic member 340, causing the other end to disengage from the contact with the seat ring 230.

[0062] like Figures 1 to 3 As shown, in one embodiment of the present invention, the second reset elastic member 340 may be a coil spring, and the coiling axis of the coil spring is arranged to substantially coincide with the axis of the rotating shaft 330. In some embodiments, the second reset elastic member 340 may also adopt other elastic structures, such as, but not limited to, sheet springs, leaf springs, etc., and is not limited to this embodiment.

[0063] As described above, the general procedure for adjusting the lift of valve 210 using the cylinder device proposed in this invention is as follows:

[0064] When the engine is running, the control motor drives the worm gear 221 to rotate, which in turn drives the adjusting sleeve 220 to rotate. The third keyway 222 engages with the spline 231, causing the valve seat 230 to rotate. As the valve seat 230 rotates, its threaded hole 232 engages with the external thread 2111 of the outer end 2111 of the valve stem 210, causing the valve 210 to rotate relative to the valve seat 230 along the first direction X. The displacement of the valve 210 allows for length adjustment of the portion of the valve seat 230 facing the cylinder head 110. Consequently, when the other end of the rocker arm 320 acts on the side of the valve seat 230 facing away from the cylinder head 110, the valve 210 and valve seat 230 lengthen or shorten relative to the rocker arm 320. This causes the cam 311 to advance or lag the opening of the valve 210, ultimately increasing or decreasing the valve lift, thus adjusting the valve lift. Furthermore, by controlling the angle of the forward or reverse movement of the motor, the magnitude of the increase or decrease in valve lift can be controlled more precisely.

[0065] Specifically, such asFigure 1 As shown, when the cam 311 rotates with the drive shaft 310 and is in the lift position, it will drive one end of the rocker arm 320 to swing up and down. The other end of the rocker arm 320 acts on the seat ring 230, and the seat ring 230 moves up and down in the cavity of the adjusting sleeve 220 along the first direction X. When the seat ring 230 moves up and down, it will overcome the preload of the first reset elastic element 240. Through the threaded engagement between the internal thread of the threaded hole 232 of the seat ring 230 and the external thread 21111 on the outer end 2111 of the valve stem 210, the valve 210 will move up and down, causing the head 212 of the valve 210 to leave or close the vent 111, thus realizing the opening or closing of the valve 210.

[0066] like Figure 2 As shown, when the cam 311 rotates with the drive shaft 310 and is positioned at the base circle of the cam 311, the valve 210 is in the closed state. The second reset elastic element 340 acts on the pivot 330 of the rocker arm 320, causing the other end of the rocker arm 320 to abut against the seat ring 230. At this time, a gap may appear at the end of the rocker arm 320 near the cam 311. The size of this gap is related to the valve lift of the cam 210. For example, the larger the valve lift of the cam 210, the smaller the gap.

[0067] When it is necessary to increase the valve lift by 210, such as Figure 3 As shown, the adjusting drive mechanism drives the adjusting sleeve 220 to rotate, and the valve seat 230 rotates under the action of the adjusting sleeve 220. Since the valve seat 230 is provided with a threaded hole 232, and since the limiting guide 400 and cylinder head 110 cannot rotate, and the valve 210 and limiting guide 400 cannot rotate relative to each other, the valve 210 cannot rotate. When the valve seat 230 rotates, the internal thread interacts with the external thread 21111 of the valve 210, causing the valve seat 230 to move upward relative to the valve 210. The upward movement of the valve seat 230 occurs along the third keyway 222 on the inner circumference of the adjusting sleeve 220. Due to the upward movement of the valve seat 230, the rocker arm 320 rises at the end near the valve seat 230 and falls at the end near the cam 311. Therefore, the cam 311 opens the valve 210 earlier, i.e., the valve 210's opening lift increases.

[0068] When it is necessary to reduce the lift of valve 210, the adjusting sleeve 220 can be driven to rotate in the opposite direction. For details, please refer to the above detailed description, which will not be repeated here.

[0069] It should be noted that the cylinder devices shown in the accompanying drawings and described in this specification are merely a few examples among many cylinder devices capable of employing the principles of the present invention. It should be clearly understood that the principles of the present invention are by no means limited to any detail or component of the cylinder devices shown in the accompanying drawings or described in this specification.

[0070] In summary, the valve mechanism of the cylinder device provided by the application comprises a valve 210, an adjusting sleeve 220, a seat ring 230, and a first reset elastic member 240. The stem 211 of the valve 210 extends in the first direction X and is arranged through the cylinder head 110. The inner end of the stem 211 is located in the cylinder head 110, and the head 212 of the valve 210 is connected to the inner end. The outer end 2111 of the stem 211 extends outside the cylinder head 110. The stem 211 and the cylinder head 110 are positioned in the circumferential direction and can be relatively displaced in the first direction X. The adjusting sleeve 220 is located outside the cylinder head 110 and is coaxially arranged with the stem 211. The adjusting sleeve 220 is driven by an adjusting drive mechanism to rotate around the central axis. The seat ring 230 is arranged in the sleeve cavity of the adjusting sleeve 220, and the outer end 2111 is arranged through the center of the seat ring 230 and is threadedly connected. The seat ring 230 and the adjusting sleeve 220 are positioned in the circumferential direction and can be relatively displaced in the first direction X. The first reset elastic member 240 is connected between the seat ring 230 and the cylinder head 110. The valve drive mechanism 300 is used to drive the seat ring 230 to move in the first direction X. Through the above design, by using the above positioning and action cooperation relationship of the stem 211 and the cylinder head 110 and the seat ring 230 and the adjusting sleeve 220, the application can drive the adjusting sleeve 220 to rotate by using the adjusting drive mechanism to drive the seat ring 230 to rotate synchronously. Since the seat ring 230 is threadedly connected with the outer end 2111 of the stem 211 and the stem 211 of the valve 210 is positioned in the circumferential direction with the cylinder head 110, the torque of the seat ring 230 will act on the threadedly connected valve 210, so that the seat ring 230 is displaced relative to the valve 210 in the first direction X. In this way, the initial position of the seat ring 230 is adjusted, that is, the variable valve 210 lift function is realized. Compared with the existing solution of realizing lift adjustment in the form of hydraulic pressure, the application uses the above mechanical adjustment scheme, reduces the design requirements for the hydraulic drive part, and can improve the control stability and accuracy of the valve 210 lift adjustment function.

[0071] Further, based on the above design of the application, the application also has at least the following advantages:

[0072] The application solves the demand for real-time variable control of the valve 210 lift during the operation of the internal combustion engine.

[0073] The application only needs to redesign the rocker arm 320 and the valve 210, without changing the cylinder body and the cylinder head 110, thereby avoiding the cost increase and the influence on the structural strength caused by the above changes.

[0074] The application reduces the driving force demand of the driving system.

[0075] When the motor is used as the adjusting driving member 224 of the adjusting driving mechanism and the worm 221 drives the adjusting sleeve 220 to rotate, the control accuracy of the increase or decrease of the valve lift of the valve 210 can be further improved, and a product design scheme with low cost and high reliability can be achieved.

[0076] The application has wide application range and is suitable for internal combustion engines using gasoline, diesel, natural gas, liquefied petroleum gas and other fuels.

[0077] Based on the above detailed description of the several exemplary embodiments of the cylinder device according to the application, an exemplary embodiment of the reciprocating piston internal combustion engine according to the application will be described below.

[0078] In an embodiment of the application, the reciprocating piston internal combustion engine according to the application comprises the cylinder device according to the application and described in detail in the above embodiments. The reciprocating piston internal combustion engine may, for example, be a four-stroke reciprocating piston internal combustion engine.

[0079] It should be noted that the reciprocating piston internal combustion engine shown in the drawings and described in the specification is only a few examples of many reciprocating piston internal combustion engines that can employ the principles of the application. It should be clearly understood that the principles of the application are by no means limited to any details or any components of the reciprocating piston internal combustion engine shown in the drawings or described in the specification.

[0080] In summary, the reciprocating piston internal combustion engine according to the application can achieve the function of variable valve lift by using the cylinder device according to the application, and can improve the control stability and accuracy of the valve lift adjustment function.

[0081] The exemplary embodiments of the cylinder device and the reciprocating piston internal combustion engine according to the application are described and / or illustrated in detail above. However, the embodiments of the application are not limited to the specific embodiments described herein, but rather, each of the individual components and / or steps of each embodiment can be used independently and separately from other components and / or steps described herein. Each component and / or step of one embodiment can also be used in combination with other components and / or steps of other embodiments. The language used in the description postulates that the words "a", "an" and "the" are used to indicate one or more than one of the elements specified. The terms "comprising", "including" and "having" are used to mean open-ended including in addition to the listed elements or steps. In addition, the terms "first" and "second" and the like used in the description and / or claims are used to distinguish between similar elements or steps and are not necessarily used to describe a particular sequential or chronological order. Except in the Examples, or where otherwise explicitly indicated, all numerical quantities in this description specify amounts relative to a particular subject matter in the specification.

[0082] While the cylinder arrangement and reciprocating piston internal combustion engine according to the present application have been described in accordance with various specific embodiments, one skilled in the art will recognize that modifications can be made to the embodiments of the present application without departing from the spirit and scope of the claims.

Claims

1. A cylinder device characterized by comprising: A cylinder device for being installed in a reciprocating piston internal combustion engine, the cylinder device comprising: a cylinder including a cylinder block and a cylinder head, the cylinder head being provided to the cylinder block and having a port communicating with an internal cavity of the cylinder block; a valve train including: a valve including a stem portion and a head portion, the stem portion extending in a first direction and being provided through the cylinder head, two ends of the stem portion in the first direction being an inner end portion and an outer end portion respectively, the inner end portion being located in the cylinder head, the head portion being connected to the inner end portion and being located at the port, the outer end portion being extended out of the cylinder head to an outside of the cylinder block, the stem portion being configured to be located opposite to the cylinder head in a circumferential direction and to be relatively displaceable in the first direction; a adjusting sleeve being located outside of the cylinder head and being coaxially arranged with the stem portion, the adjusting sleeve being rotatable about a central axis by being driven by an adjusting drive mechanism; a race being provided in a barrel cavity of the adjusting sleeve, the outer end portion being provided through a center of the race and being threadedly engaged, the race being configured to be located opposite to the adjusting sleeve in the circumferential direction and to be relatively displaceable in the first direction; and a first return elastic member being connected between the race and the cylinder head; and a valve drive mechanism for driving the race to move in the first direction relative to the cylinder head, so as to drive the valve to move in the first direction relative to the cylinder head to realize opening of the port.

2. The cylinder device according to claim 1, characterized in that Further comprising a limiting guide pipe being provided to the cylinder head, the limiting guide pipe extending in the first direction, the stem portion being partially provided through the limiting guide pipe; wherein an outer periphery of the stem portion is provided with a first key groove extending in the first direction, an inner periphery of the limiting guide pipe is provided with a second key groove extending in the first direction, the first key groove and the second key groove are oppositely arranged, and the first key groove and the second key groove are jointly provided with a ball.

3. The cylinder device according to claim 2, wherein: the outer periphery of the stem portion is provided with at least two first key grooves, the inner periphery of the limiting guide pipe is provided with at least two second key grooves, the number of the first key grooves and the second key grooves are equal and are arranged in one-to-one correspondence, and the at least two first key grooves are uniformly arranged at intervals on the outer periphery of the stem portion; and / or for at least one set of oppositely arranged first key grooves and second key grooves, at least two balls are jointly provided, and the at least two balls are arranged in the first direction.

4. The cylinder device according to claim 2, characterized in that the cylinder head is provided with a mounting hole extending in the first direction, the limiting guide pipe is provided through the mounting hole; wherein an outer periphery of the limiting guide pipe is provided with a first limiting groove, an inner periphery of the mounting hole is provided with a second limiting groove, the first limiting groove and the second limiting groove are oppositely arranged, and the first limiting groove and the second limiting groove are jointly provided with a positioning pin block.

5. The cylinder device according to claim 1, characterized in that one of an inner periphery of the adjusting sleeve and an outer periphery of the race is provided with a third key groove extending in the first direction, and the other is provided with a spline, the spline being accommodated in the third key groove and being slidable in the third key groove in the first direction.

6. The cylinder arrangement according to claim 5, characterized in that One of the inner periphery of the adjusting sleeve and the outer periphery of the seat ring is provided with at least two third key grooves, and the other is provided with at least two keys, the number of the third key grooves and the keys are equal and one-to-one corresponding arrangement, and the at least two third key grooves are arranged uniformly spaced on the inner periphery of the adjusting sleeve or the outer periphery of the seat ring.

7. The cylinder device according to claim 1, characterized in that The outer periphery of the adjusting sleeve is provided with worm gear teeth, and the adjusting driving mechanism comprises an adjusting driving member and a worm, the adjusting driving member is drivingly connected to the worm, and the worm is matched with the worm gear teeth.

8. The cylinder device of claim 1, wherein: The first reset elastic member has a first end connected to the cylinder cover, and a fitting groove is arranged on a side surface of the adjusting sleeve facing the cylinder cover, and the first end is accommodated and connected to the fitting groove; and / or The first reset elastic member has a second end connected to the seat ring, and the second end is connected to the seat ring through a bearing, so that the first reset elastic member can rotate relative to the seat ring.

9. The cylinder device according to claim 1, characterized in that The valve driving mechanism comprises a valve driving member, a transmission shaft, a rocker arm and a rotating shaft, the valve driving member is drivingly connected to the transmission shaft, a cam is arranged on the transmission shaft, the cam is arranged on one end of the rocker arm, the other end of the rocker arm is located on a side of the seat ring away from the cylinder cover, the rotating shaft is arranged in the middle of the rocker arm, and a second reset elastic member is arranged on the rotating shaft; wherein the valve driving mechanism is configured to drive the transmission shaft to rotate by the valve driving member, drive the cam to rotate, when the cam rotates to abut the one end of the rocker arm with its convex part, the other end of the rocker arm presses against the seat ring and drives the valve to move towards the cylinder cover along the first direction, and when the cam rotates to correspond to the one end of the rocker arm with its base circle part, the other end of the rocker arm is separated from the seat ring by the reverse swing of the rocker arm under the action of the second reset elastic member.

10. A reciprocating piston internal combustion engine characterised in that, The cylinder device of any one of claims 1-9. The cylinder device of any one of claims 1-9.

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