CN210509411U - Engine block and variable compression ratio mechanism - Google Patents

Abstract

The utility model provides an engine cylinder body and variable compression ratio mechanism, the utility model discloses a construct the reduction gear mount pad with installation harmonic speed reducer ware among the engine cylinder body, and in a plurality of eccentric shaft mount pads with installation eccentric shaft that the double-phase offside of reduction gear mount pad set up respectively, locate to dismantle in eccentric shaft mount pad and be connected with the eccentric shaft apron to enclose to form to have the eccentric shaft mounting hole between eccentric shaft mount pad and eccentric shaft apron, be equipped with the reduction gear mounting groove in reduction gear mount pad department, just reduction gear mount pad and eccentric shaft mount pad are set up to constitute and are arranged coaxially between harmonic speed reducer ware and the eccentric shaft of installing. The utility model discloses an engine cylinder body can avoid the increase of the axial length of engine to do benefit to the engine and carry on, also can reduce the different section torsional deformation volume's of eccentric shaft difference simultaneously when reduction gear transmission moment, and can overcome the not enough of eccentric shaft drive end arrangement mode among the current variable compression ratio technique.

Description

Engine block and variable compression ratio mechanism

Technical Field

The utility model relates to an engine technology field, in particular to engine cylinder body, the utility model discloses still relate to a variable compression ratio mechanism of installing on this engine cylinder body.

Background

The variable compression ratio mechanism adjusts the compression ratio to the most reasonable value according to different working conditions of the engine so as to achieve the purposes of improving the fuel economy of the engine and reducing the emission of the engine. In various variable compression ratio technologies, a harmonic reducer is used as a transmission part to drive an eccentric shaft to rotate, and then the eccentric shaft drives a multi-link mechanism to realize the structural form of piston top dead center change. However, in the existing variable compression ratio technology, the arrangement mode of the eccentric shaft has the problem of different torsional deformation of different sections of the eccentric shaft, and the difference of the deformation can cause large difference of compression ratios of different cylinders in an engine cylinder, so that the vibration is possibly large, and the service life of the engine is influenced.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to an engine cylinder block, so as to overcome the shortcomings of the eccentric shaft driving end arrangement in the existing variable compression ratio technology.

In order to achieve the above purpose, the technical scheme of the utility model is realized like this:

an engine cylinder body is provided, wherein a reducer mounting seat for mounting a harmonic reducer and a plurality of eccentric shaft mounting seats for mounting eccentric shafts are respectively arranged on two opposite sides of the reducer mounting seat, an eccentric shaft cover plate is detachably connected to the eccentric shaft mounting seat, an eccentric shaft mounting hole is formed between the eccentric shaft mounting seat and the eccentric shaft cover plate in a surrounding manner, a reducer mounting groove is formed in the reducer mounting seat, and the reducer mounting seat and the eccentric shaft mounting seat are arranged to form a coaxial arrangement between the installed harmonic reducer and the eccentric shaft.

Further, eccentric shaft cover plate bolt holes are respectively formed in the eccentric shaft mounting seats on the two opposite sides of the eccentric shaft mounting hole, eccentric shaft cover plate through holes are formed in the eccentric shaft cover plates corresponding to the eccentric shaft cover plate bolt holes, the eccentric shaft cover plates are connected to the eccentric shaft mounting seats through bolts, and the bolts penetrate through the eccentric shaft cover plate through holes and are connected to the eccentric shaft cover plate bolt holes.

Furthermore, the eccentric shaft cover plate is T-shaped, the eccentric shaft cover plate through holes comprise three eccentric shaft cover plate through holes which are respectively arranged at three end parts of the T-shaped eccentric shaft cover plate, and the inner diameters of the two eccentric shaft cover plate through holes at one side of the eccentric shaft mounting hole are smaller than those of the eccentric shaft cover plate through holes at the other side.

Furthermore, reducer mounting bolt holes are respectively formed in the reducer mounting seats on two sides of the reducer mounting groove, and the harmonic reducers are mounted on the reducer mounting seats through bolts connected with the reducer mounting bolt holes.

Furthermore, corresponding to the reducer mounting seat, gasket positioning grooves penetrating through the inner wall of the engine cylinder body at the position of the reducer mounting seat are formed in the inner wall of the engine cylinder body on two sides of the reducer mounting seat.

Furthermore, the eccentric shaft mounting holes are respectively arranged at two sides of the speed reducer mounting seat, and a clamping groove for clamping a clamp spring is arranged in the eccentric shaft mounting hole at the outermost side of each side.

Further, a motor mounting surface for mounting a motor is configured on the engine cylinder body, the motor mounting surface is located on the outer wall surface of the engine cylinder body, and a motor shaft through hole penetrating into the engine cylinder body is formed in the motor mounting surface.

Furthermore, a plurality of motor mounting holes are formed in the motor mounting surface, the motor mounting holes are arranged along the circumferential direction of the motor shaft through hole at intervals, and each motor mounting hole comprises a positioning bolt hole and a plurality of arc-shaped mounting through holes.

Furthermore, the motor installation surface is provided with a sealing groove which is used for arranging the motor shaft through hole to embed the sealing ring.

Compared with the prior art, the utility model discloses following advantage has:

the utility model discloses an engine cylinder body is located the reduction gear mount pad at middle part through setting up, and divide the eccentric shaft mount pad of locating both sides, can be so that the harmonic reduction gear is located the middle part of eccentric shaft, and make the harmonic reduction gear of installing and the coaxial arrangement of eccentric shaft, compare from this in the mode that current harmonic reduction gear was arranged in eccentric shaft one end, can avoid the increase of the axial length of engine on the one hand, and do benefit to the engine and carry on, on the other hand also can be when reduction gear transmission moment, reduce the difference of the different sections torsional deformation volume of eccentric shaft, thereby can overcome the not enough of the eccentric shaft drive end arrangement mode in the current variable compression ratio technique.

Another object of the present invention is to provide a variable compression ratio mechanism, which is mounted on the engine cylinder body as described above; the variable compression ratio mechanism comprises a piston, a crankshaft, an eccentric shaft, an execution connecting rod, a driving connecting rod, an adjusting connecting rod, a harmonic reducer and a motor, wherein one end of the execution connecting rod is hinged and connected with the piston, one end of the driving connecting rod is rotatably connected with the eccentric shaft, the adjusting connecting rod is rotatably arranged on the crankshaft, two ends of the adjusting connecting rod are respectively rotatably connected with the execution connecting rod and the driving connecting rod, the harmonic reducer is arranged on the engine cylinder body, the motor is fixedly arranged relative to the engine cylinder body, the power output end of the harmonic reducer is in transmission connection with the eccentric shaft, and the motor is in transmission connection with the power input.

The utility model discloses a variable compression ratio mechanism is through adopting aforementioned engine cylinder body for the increase of the axial length of engine can be avoided in setting up of this mechanism, in order to do benefit to the engine and carry on, also can reduce the difference of the different sections torsional deformation of eccentric shaft when reduction gear transmission moment simultaneously, can overcome the not enough of eccentric shaft drive end arrangement mode among the current variable compression ratio technique, and has better practicality.

Drawings

The accompanying drawings, which form a part hereof, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without undue limitation. In the drawings:

fig. 1 is a schematic structural diagram of an engine cylinder block according to a first embodiment of the present invention;

fig. 2 is a side view of an engine block according to a first embodiment of the present invention;

fig. 3 is a diagram illustrating an application state of an engine block according to a first embodiment of the present invention;

fig. 4 is a schematic structural view of a variable compression ratio mechanism according to a second embodiment of the present invention;

fig. 5 is a schematic structural view of an eccentric shaft according to a second embodiment of the present invention;

fig. 6 is a schematic structural view of a left shaft body according to a second embodiment of the present invention;

fig. 7 is a schematic structural view of a right shaft body according to a second embodiment of the present invention;

FIG. 8 is a schematic view of the engagement of the eccentric shaft with the harmonic reducer in the configuration of FIG. 3;

fig. 9 is a schematic layout view of a clamp spring according to the second embodiment of the present invention;

fig. 10 is a partial enlarged view of a portion a of fig. 9;

fig. 11 is a schematic layout view of a sealing ring according to a second embodiment of the present invention;

fig. 12 is a schematic structural view of a driving link according to a second embodiment of the present invention;

fig. 13 is an assembly view of the eccentric shaft and the driving connecting rod according to the second embodiment of the present invention;

fig. 14 is an assembly diagram of the eccentric shaft according to the second embodiment of the present invention;

fig. 15 is a schematic structural view of a gasket according to a second embodiment of the present invention;

description of reference numerals:

1-eccentric shaft, 2-wave generator, 3-steel wheel, 4-coupler, 5-flexible wheel, 6-eccentric shaft cover plate, 7-clamp spring, 8-motor, 9-belt, 10-sealing ring, 11-driving connecting rod, 12-engine cylinder, 13-second bearing, 14-first bearing, 15-rivet, 16-crankshaft, 17-adjusting connecting rod, 18-executing connecting rod, 19-piston, 20-gasket;

101-a left shaft body, 1011-a left mandrel, 1012-a left eccentric wheel, 102-a right shaft body, 1021-a right mandrel, 1022-a right eccentric wheel, 103-a main oil gallery and 104-an oil hole;

401-flange, 402-flange attachment hole;

1101-link body, 1102-link cover plate;

1201-eccentric shaft mount, 1202-eccentric shaft mount hole, 12021-snap groove, 1203-reducer mount, 1204-reducer mount groove, 1205-eccentric shaft cover plate bolt hole, 1206-main bearing cap bolt mount hole, 1207-reducer mount bolt hole, 1208-gasket locator groove, 1209-motor mount face, 1210-motor shaft via hole, 1211-locator bolt hole, 1212-mount via hole, 1213-seal groove;

2001-positioning the nose.

Detailed Description

It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

Example one

The present embodiment relates to an engine block which is applied to an engine with a variable compression ratio, and the variable compression ratio engine is specifically a multi-link type variable compression ratio mechanism employing an eccentric shaft and a multi-link mechanism. In the multi-link variable compression ratio mechanism, the eccentric shaft is also used for receiving the driving force of rotation through the harmonic reducer, and the engine cylinder body of the embodiment is mainly designed for the arrangement of the eccentric shaft and the harmonic reducer.

It should be noted that, since the above eccentric shaft and the harmonic reducer, and the motor for outputting the rotational driving force are specifically disposed on the lower cylinder block in the engine cylinder block, in the present embodiment and the following second embodiment, only the lower cylinder block shown in the drawings is taken as an object for description, and for other parts in the engine cylinder block except the lower cylinder block, reference may be made to related structures in the existing engine cylinder block, and details thereof are not repeated here.

From the application state of the engine block 12 shown in fig. 1 and fig. 2 in combination with fig. 3, the engine block 12 of the present embodiment structurally has a reducer mounting base 1203 for mounting a harmonic reducer therein, and a plurality of eccentric shaft mounting bases 1201 provided on two opposite sides of the reducer mounting base 1203, respectively, for mounting the eccentric shafts 1. In addition, a motor mounting surface 1209 for mounting the motor 8 is also configured on the engine block 12, and the motor mounting surface 1209 is specifically located on the outer wall surface of the engine block 12, whereby heat dissipation of the motor 8 can be facilitated.

The reducer mount 1203 and the eccentric shaft mounts 1201 are arranged side by side in the engine cylinder 12, the eccentric shaft mount 1201 is also detachably connected to the eccentric shaft mount 6, an eccentric shaft mount hole 1202 is formed between the eccentric shaft mount 1201 and the eccentric shaft cover 6, and a reducer mount 1204 is disposed at the reducer mount 1203. The eccentric shaft 1 is mounted in the mounting hole 1202, the harmonic reducer is fixed in the reducer mounting groove 1204 by the steel wheel 3 therein, and the reducer mounting base 1203 and the eccentric shaft mounting base 1201 of the present embodiment are also arranged so as to constitute a coaxial arrangement between the mounted harmonic reducer and the eccentric shaft 1.

In this embodiment, the eccentric shaft mounting seats 1201 on the opposite sides of the eccentric shaft mounting hole 1202 are respectively provided with eccentric shaft cover plate bolt holes 1205, corresponding to each eccentric shaft cover plate bolt hole 1205, the eccentric shaft cover plate 6 is correspondingly provided with an eccentric shaft cover plate via hole, and the eccentric shaft cover plate 6 is connected to the eccentric shaft mounting seats 1201 through bolts penetrating through the eccentric shaft cover plate via holes and connected to the eccentric shaft cover plate bolt holes 1205. As an exemplary structure, the eccentric shaft cover plate 6 of the present embodiment is specifically arranged in a "T" shape, the eccentric shaft cover plate through holes are three through holes respectively arranged at three ends of the T-shaped eccentric shaft cover plate 6, and meanwhile, the inner diameters of the two eccentric shaft cover plate through holes at one side of the eccentric shaft mounting hole 1202 are also smaller than those of the eccentric shaft cover plate through holes at the other side.

Eccentric shaft cover plate bolt holes 1205 on eccentric shaft mounting base 1201 are also one on two sides of one side, and the inner diameter of two eccentric shaft cover plate bolt holes 1205 on the same side is smaller than that of the eccentric shaft cover plate bolt hole 105 on the other side. By making the eccentric shaft cover plate 6T-shaped, it is possible to avoid interference between the eccentric shaft cover plate bolt holes 1205 on the engine cylinder block 12 and the main bearing cap bolt mounting holes 1206, thereby facilitating arrangement of each mounting hole structure on the engine cylinder block 12.

In addition, it should be noted that, for the formation of the eccentric shaft mounting hole 1202, it is specifically configured that semi-circular grooves are respectively formed on two opposite end surfaces of the eccentric shaft mounting base 1201 and the eccentric shaft cover plate 6, and after the eccentric shaft cover plate 6 is fixed, the two semi-circular grooves are buckled together to form the integral eccentric shaft mounting hole 1202. In the present embodiment, similar to the design of the eccentric shaft mounting base 1201, the reducer mounting base 1203 on both sides of the reducer mounting groove 1204 is provided with reducer mounting bolt holes 1207, respectively, and the steel wheel 3 in the harmonic reducer is mounted on the reducer mounting base 1203 by bolts connected to the respective reducer mounting bolt holes 1207.

The shape of the above-mentioned reducer installation groove 1204 is preferably configured to match the external shape of the harmonic reducer, and is also a semicircular groove, so that the arrangement of the harmonic reducer at the reducer installation seat 1203 is facilitated, and the above arrangement is made coaxially between the installed harmonic reducer and the eccentric shaft 1, which is achieved by making the axis of the eccentric shaft installation hole 1202 coincide with the axis of the reducer installation groove 1204. Of course, the reducer installation groove 1204 may be designed into other shapes according to the arrangement requirement of each component in the engine cylinder 12, as long as it does not affect the reliable installation of the harmonic reducer, and the reducer installation base 1203 is matched with the eccentric shaft installation base 1201, so that the eccentric shaft 1 and the harmonic reducer can be installed coaxially.

In this embodiment, in order to further ensure the coaxial precision after the installation of the speed reducer and the eccentric shaft 1, when the speed reducer is installed, a gasket is often required to be sandwiched between the harmonic speed reducer and the speed reducer mounting seat 1203 due to the machining tolerance and the structure of the component itself, so as to adjust the position degree of the harmonic speed reducer. Therefore, in order to facilitate the arrangement of the gasket during assembly, as shown in fig. 1, gasket positioning grooves 1208 penetrating to the reducer mounting seat 1203 are also provided on the inner wall of the engine block 12 on both sides of the reducer mounting seat 1203, corresponding to the reducer mounting seat 1203. The width and depth of the gasket positioning groove 1208 may be designed accordingly according to the size of the gasket, and certainly, in order to ensure the structural strength of the engine cylinder 12, it should not be set to be large.

In order to limit the axial movement of the eccentric shaft 1 after the eccentric shaft 1 is mounted, so as to ensure the reliable operation of the eccentric shaft 1, in the embodiment, the eccentric shaft mounting holes 1202 respectively disposed at both sides of the reducer mounting base 1203 are also provided with the clamping grooves 12021 for clamping the snap springs in the outermost eccentric shaft mounting holes 1202 at each side. The specific arrangement of the circlip in the groove 12021 will be described in detail in the second embodiment below.

In this embodiment, a motor shaft through hole 1210 penetrating into the engine cylinder 12 is provided at the motor mounting surface 1209, and a motor shaft of the motor 8 is inserted into the engine cylinder 12 through the motor shaft through hole 1210, so that the belt 9 and a gear provided at an end of the motor shaft are engaged and connected, and the harmonic reducer can be driven. Besides, besides the motor shaft via hole 1210, a plurality of motor mounting holes are also disposed on the motor mounting surface 1209, each motor mounting hole is arranged at intervals along the circumference of the motor shaft via hole 1210, and each motor mounting hole specifically includes a positioning bolt hole 1211 and a plurality of arc-shaped mounting via holes 1212.

The motor 8 can be pre-positioned first by the positioning bolt holes 1211 to facilitate installation, and the plurality of arc-shaped mounting through holes 1212 can adjust the position of the motor 8 after positioning to facilitate final fixing of the motor 8. Because the motor 8 is disposed outside the engine block 12, in order to ensure the sealing performance of the engine block 12, in this embodiment, a sealing groove 1213 for embedding a sealing ring is also disposed on the motor mounting surface 1209, and the sealing ring is sandwiched between the motor 8 and the outer wall of the engine block after the motor 8 is mounted, so as to achieve the sealing effect. Of course, when the motor 8 is mounted, it should be noted that the positioning bolt holes 1211 and the mounting through holes 1212 are sealed by a gasket or the like.

The engine cylinder body 12 of this embodiment is located the reduction gear mount 1203 in the middle part through the setting, and locate the eccentric shaft mount 1201 of both sides separately, can be so that the harmonic reduction gear is located the middle part of eccentric shaft 1, and make the harmonic reduction gear installed and eccentric shaft 1 arrange coaxially, compare the mode that current harmonic reduction gear was arranged in eccentric shaft 1 one end from this, can avoid the increase of the axial length of engine, in order to do benefit to the engine and carry on, and also when the reduction gear transmits moment, reduce the difference of the different section torsional deformation volume of eccentric shaft 1, and then can overcome the not enough of current eccentric shaft drive end arrangement mode.

Further, the specific application of the engine block 12 of the present embodiment will be further described in conjunction with the description of the variable compression ratio mechanism of the second embodiment below, and the related contents may be referred to the description of the second embodiment.

Example two

The present embodiment relates to a variable compression ratio mechanism, which is disposed on the engine cylinder 12 according to the first embodiment, wherein the variable compression ratio mechanism is as described in the first embodiment, and specifically is a multi-link variable compression ratio mechanism using an eccentric shaft and a multi-link mechanism, and an exemplary structure of the mechanism is as shown in fig. 4, and the mechanism integrally includes a piston 19, a crankshaft 16, an eccentric shaft 1, an actuating link 18 with one end connected to the piston 19 in a hinged manner, a driving link 11 with one end connected to the eccentric shaft 1 in a rotating manner, and an adjusting link 17 rotatably disposed on the crankshaft 16 and with two ends respectively connected to the actuating link 18 and the driving link 11 in a rotating manner.

As shown in fig. 3, the variable compression ratio mechanism of this embodiment further includes a harmonic reducer and a motor 8 mounted on the engine cylinder 12, wherein a power output end of the harmonic reducer, i.e., a flexible gear therein, is in transmission connection with the eccentric shaft, and a power input end of the harmonic reducer, i.e., a wave generator therein, is in transmission connection with the motor 8.

The motor 8 may be a stepping motor or a servo motor, and it is needless to say that other rotary power output structures which can be arranged at the engine besides the motor 8 may be adopted, and the embodiment is not limited thereto. The harmonic reducer of the present embodiment is specifically in transmission connection with the motor 8 through a transmission unit, for example, a belt transmission structure with a belt 9 shown in fig. 3 or fig. 4 may be adopted for the transmission unit, and the belt 9 is in meshing connection with gear structures respectively arranged at the motor 8 and the harmonic reducer, so as to realize transmission of power of the motor 8 to the harmonic reducer. Of course, instead of a belt drive, other types of drives such as chain drives or gear drives may be used.

Unlike the eccentric shaft structure used in the prior art, as shown in fig. 5, the eccentric shaft 1 of the present embodiment, which is adapted to the driving structure, includes a left shaft body 101, a right shaft body 102, and a coupling 4 interposed in the middle and connected to the left shaft body 101 and the right shaft body 102 in a plug-in manner. The flexible gear in the harmonic reducer is specifically in transmission connection with the coupling 4, the shaft bodies on both sides are structurally provided with a mandrel and a plurality of eccentric wheels arranged on the mandrel at intervals, and are combined with the shaft bodies shown in fig. 6 and 7, specifically, the left shaft body 101 comprises a left mandrel 1011 and a plurality of left eccentric wheels 1012, and the right shaft body 102 comprises a right mandrel 1021 and a plurality of right eccentric wheels 1022.

Each mandrel and the eccentric thereon of the present embodiment may be a unitary structure as shown in fig. 5, which may be specifically prepared via casting and surface machining. Besides the integral structure, it is also possible to separately form the mandrel and the eccentric wheel, then sleeve the eccentric wheel onto the mandrel, and fix the mandrel and the eccentric wheel together by using a pin, a bolt, a rivet, or other structures, thereby obtaining a two-side shaft structure consistent with the structure shown in fig. 6 and 7.

Through the connection of the shaft coupling 4, the present embodiment can realize the synchronous coaxial rotation among the left shaft body 101, the right shaft body 102 and the shaft coupling 4. As a preferred embodiment, referring to fig. 8, generally, a coupling hole for connecting with the left shaft body 101 and the right shaft body 102 is formed in the coupling 4, an inner spline axially arranged along the coupling hole is disposed on an inner wall of the coupling hole, and meanwhile, an outer spline axially arranged is disposed at one end of the left shaft body 101 and the right shaft body 102 for connecting with the coupling 4, so that the shaft bodies on both sides are inserted into the coupling hole through the outer spline formed on the shaft bodies, and reliable connection between the shaft bodies and the coupling 4 can be achieved.

It should be noted that the coupling hole on the coupling 4 preferably extends directly through both ends of the coupling 4, thereby facilitating the forming of the coupling hole with the internal spline. In order to perform the transmission connection between the eccentric shaft 1 and the flexible gear in the harmonic reducer, the coupling 4 is provided with a connection portion for connecting with the harmonic reducer, so as to receive the rotation of the motor 8. In this case, as a preferred form of arrangement of the connection portion, the circumferential direction of the ring coupling 4 of the present embodiment is configured with a radially outwardly protruding flange 401, and the connection portion is a flange connection hole 402 provided on the flange 401.

The flange connection holes 402 are generally disposed through both end surfaces of the flange 401, and the flange connection holes 402 on the flange 401 may be connected to the flexspline in the speed reducer by means of, for example, rivets, bolts, or pins. Furthermore, as also shown in fig. 5, the flange 401 on the coupling 4 has an extension width k in the axial direction of the coupling 4, while the end portions of the ends of the left-hand shaft body 101 and the right-hand shaft body 102 connected to the coupling 4 are located within the extension width k in this embodiment, and preferably the end portions of the two-hand shaft bodies are located just in the middle of the extension width k.

The end part of one end of the shaft bodies on the two sides, which is connected with the shaft coupling 4, is positioned in the middle of the extension width k, or the end part of the shaft bodies on the two sides is only positioned in the interval of the extension width k, so that when the shaft bodies are connected and rotated to drive, the driving force acts on the whole central position of the eccentric shaft 1, the whole deformation of the eccentric shaft 1 can be reduced, and the transmission precision of the eccentric shaft 1 is effectively improved.

In the embodiment, in order to ensure effective lubrication of the eccentric shaft 1 when in use, a main oil gallery 103 arranged along the axial direction of the mandrel is also provided in the mandrel of the shaft bodies on both sides, and a plurality of oil holes 104 are also provided along the radial direction of the mandrel. The main oil gallery 103 is communicated with a lubricating oil passage in the engine cylinder body 12 to introduce lubricating oil in the lubricating oil passage of the engine cylinder body 12, one end of the oil holes 104 is communicated with the main oil gallery 103, and the other end of the oil holes 104 is arranged in two situations, wherein some of the oil holes 104 directly penetrate through the outer surface of the mandrel to be used for lubricating the outer peripheral surface of the mandrel, and other oil holes 104 penetrate through the outer surface of the eccentric wheel to be used for lubricating the outer peripheral surface of the eccentric wheel. When the engine is assembled, the ports of the main oil gallery 103 at the two ends of the integral eccentric shaft 1 are also blocked by a sensor mounting pin or other structures, so as to prevent lubricating oil from leaking and maintain the pressure of the lubricating oil.

In the embodiment, as shown in fig. 9, each eccentric shaft cover plate 6 is detachably fixed at an eccentric shaft mounting base 1201 by a bolt a and two bolts b, and the steel wheel 3 in the harmonic reducer is fixed at a reducer mounting base 1203 in the engine block 12 by a bolt c. Still referring to fig. 8, the harmonic reducer of the present embodiment still includes a steel wheel 3, a flexible wheel 5, and a wave generator 2 in terms of composition, where the wave generator 2, the steel wheel 3, and the flexible wheel 5 are mutually matched to implement the action mechanism of the reduction power transmission, which is the same as the harmonic reducer structure widely used in the prior art, and details thereof are not repeated here.

In the arrangement of the harmonic reducer of this embodiment, the steel wheel 3 is fixed to the reducer mounting base 1203 by the bolt c via the bosses formed on two opposite sides of the steel wheel, and the steel wheel 3 is used as a structural foundation of the whole reducer to carry out bearing and installation of the flexible gear 5 and the wave generator 2, and the steel wheel 3 is also used as a carrier for arranging the coupling 4 in the eccentric shaft assembly, and realizes connection between the coupling 4 and the power output end of the reducer, that is, the flexible gear 5.

Specifically, the coupling 4 is rotatably disposed in the steel wheel 3 through the first bearing 14 and is located on one side of the flexible gear 5, and the inner ring of the first bearing 14 and the flange 401 on the coupling 4, and the outer ring of the first bearing 14 and the inner wall of the steel wheel 3 are in interference fit, so that the radial force applied to the eccentric shaft 1 can be transmitted to the steel wheel 3 through the first bearing 14 and further transmitted to the engine cylinder 12 fixedly connected with the rigid gear 3, thereby avoiding the direct force applied to the harmonic reducer itself, and preventing the wave generator 2 of the harmonic reducer from being damaged by the flexible gear 5.

In this embodiment, for the connection between the flexible gear 5 and the coupling 4, a plurality of flexible gear connection holes are generally formed on the flexible gear 5, and the flexible gear connection holes are circumferentially spaced from each other, and meanwhile, the flange connection holes 402 formed on the coupling 4 are also a plurality of flexible gear connection holes corresponding to the flexible gear connection holes one to one. With this as a preferred form, can specifically connect through the rivet 15 in wearing to establish flexbile gear connecting hole and the flange connecting hole 402 on the flange 401 between flexbile gear 5 and the shaft coupling 4, and the reliability of connecting between the two can be guaranteed to the ring shaft coupling 4 and the flexbile gear 5 a plurality of rivets 15 of circumference interval arrangement, and through adopting rivet 15 then can utilize the thinner characteristics of rivet 15 head, effectively reduce the requirement of reduction gear subassembly to axial dimension. Of course, if the size is suitable, it is also possible to select a structure such as a bolt to realize the connection between the flexible gear 5 and the coupling 4.

The wave generator 2 of this embodiment is specifically disposed at one end of the coupler 4 through the rotation of the second bearing 13, and the second bearing 13 and the wave generator 2 may be in an interference fit, and preferably, a clearance fit is adopted between the second bearing 13 and the coupler 4. Whereas the relative rotation between the steel wheel 3 and the coupling 4, and between the coupling 4 and the wave generator 2, is achieved by means of the second bearing 13 and the above-mentioned first bearing 14. Meanwhile, the wave generator 2, the bearing 13 and the flexible gear 5 are axially limited along the coupler 4 by utilizing a plurality of shoulder structures arranged on the outer peripheral surface of the coupler 4 and the end part of the coupler 4.

It should be noted that, just as the end portions of the shaft bodies on both sides of the eccentric shaft 1 are located at the middle of the extending width k of the flange 401, the present embodiment is also preferably based on that the end portions of the shaft bodies on both sides of the eccentric shaft 1 are simultaneously arranged corresponding to the middle of the width of the bearing 14, so that the driving force can be applied to the shaft center position, and the driving end is closer to each eccentric wheel, thereby reducing the deformation of the eccentric shaft 1 and effectively improving the transmission precision. In this embodiment, the portion of the wave generator 2 projecting beyond the side of the rigid wheel 3 is provided with the aforesaid gear structure, on which one end of the belt 9 is wound and engaged.

As shown in fig. 9 and 10, based on the arrangement of the locking groove 12021 in the outermost eccentric shaft mounting hole 1201 in the first embodiment, in order to prevent the eccentric shaft 1 from axial play during operation, it is also selected that the end of the eccentric shaft 1 is limited to one eccentric shaft mounting hole 1202, wherein the end of the eccentric shaft 1 includes the end of both ends of the eccentric shaft 1, and the "limited" means that the end of the eccentric shaft 1 is located in the eccentric shaft mounting hole 1202 and does not protrude from the eccentric shaft mounting hole 1202, and correspondingly, the clamp spring 7 blocked on the end side of the eccentric shaft 1 is embedded in the eccentric shaft mounting hole 1202 which contains the end of the eccentric shaft 1, i.e. the outermost eccentric shaft mounting hole 1202.

The inner aperture of the clamp spring 7 is smaller than the outer diameter of the eccentric shaft 1, so that the axial movement of the eccentric shaft 1 is blocked. In addition, to the formation of the clamping groove 12021, it specifically is to set up the semicircle clamping groove structure on the eccentric shaft mount pad 1201 and the eccentric shaft cover plate 6 correspondingly, when the eccentric shaft cover plate 6 is fixed, place the jump ring 7 in the semicircle clamping groove structure on the eccentric shaft mount pad 1201 earlier, make the jump ring 7 place in the semicircle clamping groove structure on the eccentric shaft cover plate 6 in the eccentric shaft cover plate 6 after the eccentric shaft cover plate 6 lock again alright.

Because when the variable compression ratio mechanism works, the eccentric shaft 1 rotates in a reciprocating manner within a certain angle range, so as to limit the rotation angle of the eccentric shaft 1, so as to ensure that the eccentric shaft works within a set angle range, in the embodiment, for example, a radial convex stop block can be arranged on the coupler 4, two limit blocks positioned on the rotation path of the stop block are correspondingly arranged on the steel wheel 3, and the included angle between the two limit blocks is the angle range set by the eccentric shaft 1, so that the mechanical limit of the rotation angle of the eccentric shaft 1 can be realized through the rotation of the stop block between the two limit blocks.

The present embodiment is configured such that the motor 8 is mounted on the outer side wall of the engine block 12 by bolts d, as shown in fig. 11, and when the motor 8 is mounted, the seal ring 10 is interposed between the motor 8 and the engine block 12 to seal therebetween.

In the present embodiment, with respect to the driving link 11 connected to the eccentric shaft 1, it should be noted that an embodiment of the driving link 11 may be as shown in fig. 12 and 13, in which case the driving link 11 is configured to include a link main body 1101 having one end connected to the adjusting link 17, and a link cover 1102 detachably connected to the other end of the link main body 1101 by a bolt e. Between the connecting rod body 1101 and the connecting rod cover 1102 there is formed an eccentric shaft connecting hole in which the eccentric on the eccentric shaft 1 is rotatably connected, whereby a rotational connection between the eccentric shaft 1 and the drive connecting rod 11 is achieved.

Based on the above description of the structure, when the variable compression ratio mechanism of the present embodiment is assembled, the coupling 4 and the harmonic reducer are first assembled together, and then the left shaft body 101 and the right shaft body 102 on both sides are inserted into the coupling 4 as shown in fig. 14. Then, the belt 9 is put on, the harmonic reducer and the eccentric shaft 1 assembled together are placed in the engine cylinder 12, and then the eccentric shaft cover plates 6 are mounted. During installation, the eccentric shaft cover plates 6 with the shorter distance at the two sides of the speed reducer are installed firstly to complete radial limiting of the eccentric shaft 1, and finally the eccentric shaft cover plates 6 at the two ends are installed after the clamp springs 7 are placed on the eccentric shaft installation seats 1201 at the end parts, so that axial limiting of the eccentric shaft 1 is achieved.

Next, the steel wheel 3 of the harmonic reducer is fastened, when the steel wheel 3 is fastened, the position of the steel wheel 3 can be adjusted by selecting the gasket 20 as shown in fig. 15, the gasket 20 is clamped between the reducer mounting seat 1203 and the bosses on the two opposite sides of the steel wheel 3 to ensure the coaxial precision of the reducer and the eccentric shaft 1, and the positioning protrusions on the gasket 20 are embedded in the gasket positioning grooves 1208 on the engine cylinder 12 to position the gasket 20.

At this time, in the machining of the engine block 12, the upper surface of the block is generally used as a machining reference for the eccentric shaft mounting base 1201 and the reducer mounting base 1203, and the accuracy of the coaxiality between the harmonic reducer and the eccentric shaft 1 mainly depends on the tolerance of the eccentric shaft mounting hole 1202 with respect to the upper surface of the block, the tolerance of the reducer mounting groove 1204 with respect to the upper surface of the block, and the coaxiality tolerance of the coupling 4 with respect to the steel wheel 3 during assembly.

Moreover, since the boss of the steel wheel 3 for mounting itself is formed, there is often a height difference between the end surface of the steel wheel 3 abutting against the reducer mounting base 1203 via the spacer 20 and the central surface passing through the center of the steel wheel 3 and parallel to the end surface, the spacer 20 is provided to eliminate the height difference and the above three tolerances, so as to satisfy the coaxiality between the reducer and the eccentric shaft 1. In a specific operation, the vertical distance between the center of the coupling 4 and the end surface of the boss on the steel wheel 3 and the vertical distance between the center of the reducer installation groove 1204 and the plane of the reducer installation seat 1203 for bearing the boss can be measured.

Since the two values of distance measured by the different engines are generally not identical and are generally not controllable, it is obviously not appropriate to provide gaskets 20 of corresponding thickness for each engine. Since the above distance value is often in a range, the range of the distance value may be segmented in practical implementation from the viewpoint of eliminating the height difference and the three tolerances as much as possible, and each segment corresponds to a thickness of the gasket 20. By grouping the thicknesses of the shims 20, an appropriate shim 20 can be selected according to the measured distance values, thereby ensuring the coaxiality of the reducer and the eccentric shaft 1 to the greatest extent. To facilitate identification of shims 20, different thickness sets of shims 20 may be differently colored, for example, to facilitate fitting.

After the reducer is fixed, the motor 8 can be arranged on one side of the engine cylinder body 12, and two ends of the belt 9 are wound on the gear structure on the output shafts of the wave generator 2 and the motor 8. Finally, the driving connecting rod 11 is connected to each eccentric wheel of the eccentric shaft 1 through a bolt e, and the corresponding adjusting connecting rod 17 and the corresponding executing connecting rod 18 are respectively connected with the crankshaft 16 and the piston 19, and meanwhile, the hinging between the connecting rods is realized, namely the assembly of the variable compression ratio mechanism is completed.

When the variable compression ratio mechanism of the embodiment works, the motor 8 drives the eccentric shaft 1 to rotate through the harmonic reducer, the rotation of the eccentric shaft 1 is driven by the driving connecting rod 11, the adjusting connecting rod 17 and the executing connecting rod 18, and the change of the top dead center of the piston 19 can be realized, so that the adjustment of the compression ratio of the engine can be changed, and the working performance of the engine can be improved. Meanwhile, the main oil gallery 103 and the oil holes 104 designed in the eccentric shaft 1 can effectively lubricate the eccentric shaft mounting hole 102 and the eccentric shaft connecting hole of the driving connecting rod 11 during operation, so that the reliable operation of the mechanism can be ensured.

The variable compression ratio mechanism of the embodiment adopts the eccentric shaft 1 with a two-section structure and is in transmission connection with the harmonic reducer through the coupler 4 in the middle to bear the driving force, so that the torsional deformation of two ends of the eccentric shaft 1 is consistent by utilizing the middle-arranged form of the harmonic reducer, and the difference of the torsional deformation of the eccentric shaft 1 can be reduced, thereby avoiding the problem of large compression ratio difference of each cylinder of the engine. Meanwhile, by arranging the harmonic speed reducer and the coupling 4 coaxially, the transmission error can be reduced, and the driving accuracy of the eccentric shaft can be improved.

In addition, the eccentric shaft 1 is installed through the eccentric shaft cover plate 6, the embodiment can also realize that parts are assembled outside and then assembled with the cylinder body, the space in the bottom cavity of the lower cylinder body in the engine cylinder body 12 can be effectively enlarged, the assembly of the speed reducer, the eccentric shaft 1 and the multi-connecting-rod structure is convenient, the weight of the cylinder body can be reduced, and the practicability is good.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. An engine block, characterized by: the engine cylinder body (12) is internally provided with a reducer mounting seat (1203) for mounting a harmonic reducer, a plurality of eccentric shaft mounting seats (1201) which are respectively arranged on two opposite sides of the reducer mounting seat (1203) and are used for mounting an eccentric shaft (1), an eccentric shaft cover plate (6) is detachably connected to the eccentric shaft mounting seats (1201), an eccentric shaft mounting hole (1202) is formed between the eccentric shaft mounting seat (1201) and the eccentric shaft cover plate (6) in a surrounding mode, a reducer mounting groove (1204) is arranged on the reducer mounting seat (1203), and the reducer mounting seat (1203) and the eccentric shaft mounting seat (1201) are arranged to form a coaxial arrangement between the installed harmonic reducer and the eccentric shaft (1).

2. The engine block according to claim 1, wherein: eccentric shaft cover plate bolt holes (1205) are respectively formed in the eccentric shaft mounting bases (1201) on two opposite sides of the eccentric shaft mounting hole (1202), eccentric shaft cover plate via holes are formed in the eccentric shaft cover plate (6) corresponding to the eccentric shaft cover plate bolt holes (1205), the eccentric shaft cover plate (6) is connected to the eccentric shaft mounting bases (1201) through bolts (a and b), and the bolts (a and b) penetrate through the eccentric shaft cover plate via holes and are connected to the eccentric shaft cover plate bolt holes (1205).

3. The engine block according to claim 2, wherein: the eccentric shaft cover plate (6) is T-shaped, the eccentric shaft cover plate through holes comprise three parts which are respectively arranged at three end parts of the T-shaped eccentric shaft cover plate (6), and the inner diameters of the two eccentric shaft cover plate through holes positioned at one side of the eccentric shaft mounting hole (1202) are smaller than those of the eccentric shaft cover plate through holes at the other side.

4. The engine block according to claim 1, wherein: reducer mounting bolt holes (1207) are respectively formed in the reducer mounting seats (1203) on two sides of the reducer mounting groove (1204), and the harmonic reducers are mounted on the reducer mounting seats (1203) through bolts (c) connected with the reducer mounting bolt holes (1207).

5. The engine block according to claim 1, wherein: corresponding to the speed reducer mounting seat (1203), a gasket positioning groove (1208) penetrating through the speed reducer mounting seat (1203) is formed in the inner wall of the engine cylinder body (12) on two sides of the speed reducer mounting seat (1203).

6. The engine block according to claim 1, wherein: the clamping grooves (12021) for clamping the clamp springs (7) are formed in the eccentric shaft mounting holes (1202) which are respectively formed in the two sides of the speed reducer mounting seat (1203), and the outermost side of each side of the eccentric shaft mounting hole (1202).

7. The engine block according to any one of claims 1 to 6, characterized in that: the engine cylinder body (12) is provided with a motor mounting surface (1209) for mounting a motor (8), the motor mounting surface (1209) is positioned on the outer wall surface of the engine cylinder body (12), and a motor shaft through hole (1210) penetrating into the engine cylinder body (12) is formed in the motor mounting surface (1209).

8. The engine block according to claim 7, wherein: the motor mounting surface (1209) is provided with a plurality of motor mounting holes, each motor mounting hole is arranged along the circumferential direction of the motor shaft through hole (1210) at intervals, and each motor mounting hole comprises a positioning bolt hole (1211) and a plurality of arc-shaped mounting through holes (1212).

9. The engine block according to claim 7, wherein: and the motor installation surface (1209) is provided with a sealing groove (1213) which is used for surrounding the motor shaft through hole (1210) and embedding the sealing ring (10).

10. A variable compression ratio mechanism characterized in that: the variable compression ratio mechanism is mounted on an engine block (12) according to any one of claims 1 to 9; the variable compression ratio mechanism comprises a piston (19), a crankshaft (16), an eccentric shaft (1), an execution connecting rod (18) with one end hinged to the piston (19), a driving connecting rod (11) with one end rotatably connected to the eccentric shaft (1), an adjusting connecting rod (17) rotatably arranged on the crankshaft (16) and with two ends rotatably connected to the execution connecting rod (18) and the driving connecting rod (11) respectively, and further comprises a harmonic reducer arranged on the engine cylinder body (12) and a motor (8) fixedly arranged relative to the engine cylinder body (12), wherein the power output end of the harmonic reducer is in transmission connection with the eccentric shaft (1), and the motor (8) is in transmission connection with the power input end of the harmonic reducer through a transmission unit.

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