CN215292686U - Variable compression ratio mechanism mounting structure and engine - Google Patents

Abstract

The utility model provides a variable compression ratio mechanism's mounting structure and engine, the utility model discloses a variable compression ratio mechanism's mounting structure is including connecting a plurality of bearing frames of arranging side by side on the engine cylinder body, and all the bearing frame is connected together through supporting the clamp plate. The utility model discloses a variable compression ratio mechanism's mounting structure connects each bearing frame as an organic whole through the supporting pressure plate, can improve the support rigidity of bearing frame to can reduce the risk that the bearing frame produced the deformation, be favorable to promoting the stability of variable compression ratio mechanism installation.

Description

Variable compression ratio mechanism mounting structure and engine

Technical Field

The utility model relates to the technical field of engines, in particular to mounting structure of variable compression ratio mechanism, simultaneously, the utility model discloses still relate to an engine that uses mounting structure who has this variable compression ratio mechanism.

Background

Variable compression ratio (Variable compression ratio) is a technique for dynamically adjusting the compression ratio of an internal combustion engine, and fuel efficiency and hence fuel economy of the engine can be improved by varying the compression ratio under different load conditions.

The multi-connecting-rod type variable compression ratio mechanism is a common variable compression ratio technology at present, and the adjustment of the compression ratio is realized by changing the top dead center position of a piston so as to meet different engine load requirements and further enable an engine to work in an optimal working area all the time. Therefore, the power performance can be improved, the oil consumption can be reduced, and the emission can be reduced, so that the contradiction between the power performance of the engine, the economy and the emission can be well solved.

However, the existing multi-link variable compression ratio technology has shortcomings in design, for example, the bearing seats for carrying the crankshaft and the eccentric shaft are independent from each other, and the bearing seats arranged independently reduce the overall support rigidity of the crankshaft and the eccentric shaft, and are easy to deform, so that the crankshaft is easy to have risks of eccentric wear, bearing holding and the like, and the reliability of the engine is reduced.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a mounting structure of a variable compression ratio mechanism, so as to improve the supporting rigidity of a bearing seat and reduce the risk of deformation of the bearing seat for mounting the variable compression ratio mechanism.

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

a mounting structure of a variable compression ratio mechanism includes a plurality of bearing housings arranged side by side connected to an engine block, all of the bearing housings being connected together by a support presser plate.

Further, a main bearing hole is formed between one end of each bearing seat and the engine cylinder body; the other end of each bearing block is provided with an eccentric bearing hole; the supporting pressure plate is arranged close to the eccentric bearing hole.

Furthermore, each bearing seat comprises a seat body and an end cover connected to the seat body; the main bearing hole is formed by the base body and the engine cylinder body together; the eccentric bearing hole is formed by the base body and the end cover together.

Furthermore, the supporting pressure plate is connected between the seat bodies; alternatively, the support platen is connected between the end caps.

Further, the bearing block is connected to the engine cylinder block through two groups of connecting bolts; the main bearing hole is positioned between the two groups of connecting bolts; each group of connecting bolts comprises inner side connecting bolts and outer side connecting bolts which are arranged at intervals.

Furthermore, the plurality of bearing seats comprise a first bearing seat positioned at one end and a plurality of second bearing seats sequentially arranged on one side of the first bearing seat; and the first bearing seat is provided with an installation part corresponding to the eccentric shaft driving mechanism.

Further, the end cover in the first bearing seat is connected with the seat body through an end cover connecting bolt; the end cover in the second bearing seat is connected with the seat body through the inner side connecting bolt.

Further, the supporting pressure plate is connected with the seat bodies in all the second bearing seats through the outer connecting bolts; a connecting boss is arranged on the seat body in the first bearing seat; the supporting pressure plate is connected with the connecting boss through a pressure plate connecting bolt.

Furthermore, the two inner connecting bolts on the same bearing seat are symmetrically arranged around the main bearing hole, and the two outer connecting bolts on the same bearing seat are symmetrically arranged around the main bearing hole; the distance between the inner side connecting bolts on the two sides of the first bearing seat is the same as the distance between the inner side connecting bolts on the two sides of the second bearing seat; the distance between the outer side connecting bolts on the two sides of the first bearing seat is greater than the distance between the outer side connecting bolts on the two sides of the second bearing seat.

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

variable compression ratio mechanism's mounting structure, connect each bearing frame as an organic whole through supporting pressing plate, can improve the support rigidity of each bearing frame from this, reduce the risk that the bearing frame produced the deformation to can improve variable compression ratio engine's reliability.

Another object of the present invention is to provide an engine, wherein the engine is provided with a variable compression ratio mechanism, and the variable compression ratio mechanism is installed in the engine cylinder through the installation structure of the variable compression ratio mechanism as described above.

Further, the variable compression ratio mechanism includes an eccentric shaft, a multi-link mechanism connected between the piston, the crankshaft and the eccentric shaft, and an eccentric shaft driving mechanism; the multi-link mechanism includes a lower link rotatably provided on the crankshaft, an upper link hinged between the lower link and the piston, and a control link hinged between the lower link and the eccentric shaft.

Further, the eccentric shaft driving mechanism comprises a motor and a speed reducer in transmission connection with the motor; the speed reducer is connected with one end of the eccentric shaft in a transmission way.

The engine, through as above mounting structure carry out variable compression ratio mechanism's installation, can improve the support rigidity of each bearing frame, reduce the risk that the bearing frame takes place to warp, and can improve the reliability of engine.

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 view illustrating a variable compression ratio mechanism according to a first embodiment of the present invention;

fig. 2 is a schematic structural view of a mounting structure of a variable compression ratio mechanism according to a first embodiment of the present invention;

fig. 3 is a schematic view of the stress at the main bearing hole and the eccentric bearing hole according to the first embodiment of the present invention;

fig. 4 is a schematic view illustrating the installation of each bearing seat according to the first embodiment of the present invention;

description of reference numerals:

1. an engine block; 2. a crankshaft; 3. a piston; 4. an eccentric shaft; 5. a lower connecting rod; 6. an upper connecting rod; 7. a first bearing housing; 8. a second bearing housing; 9. a control link; 10. supporting the pressure plate; 11. an eccentric shaft drive mechanism; 12. a main bearing hole; 13. an eccentric bearing bore;

701. a first bearing block body; 7011. connecting the bosses; 702. a first bearing block end cap; 703. a first inner connecting bolt; 704. a first outer connecting bolt; 705. the end cover is connected with a bolt; 706. the pressing plate is connected with a bolt;

801. a second bearing block base; 802. a second bearing block end cap; 803. a second inner connecting bolt; 804. a second outboard connecting bolt;

1101. a motor; 1102. and a speed reducer.

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.

In the description of the present invention, it should be noted that, if terms indicating orientation or positional relationship such as "upper", "lower", "inner", "back", etc. appear, they are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connecting" are to be construed broadly unless otherwise specifically limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. To those of ordinary skill in the art, the specific meaning of the above terms in the present invention can be understood in combination with the specific situation.

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 a mounting structure of a variable compression ratio mechanism, wherein the variable compression ratio mechanism of the present embodiment is embodied as a multi-link type variable compression ratio mechanism, and as shown in fig. 1, in configuration, the variable compression ratio mechanism includes an eccentric shaft 4, a multi-link mechanism connected between the eccentric shaft 4, a crankshaft 2, and a piston 3, and an eccentric shaft drive mechanism 9 for driving the eccentric shaft 4 to rotate.

The above-mentioned multi-link mechanism comprises in particular a lower connecting rod 5 rotatably arranged on the crankshaft 2, an upper connecting rod 6 hinged between the lower connecting rod 5 and the piston 3, and a control connecting rod 9 hinged between the lower connecting rod 5 and the eccentric shaft 4. In practice, the upper connecting rod 6 and the piston 3, and the lower connecting rod 5 and the upper connecting rod 6 and the control connecting rod 9 are hinged together by connecting pins, and the end of the control connecting rod 9 connected to the eccentric shaft 4 is rotatably mounted on an eccentric wheel of the eccentric shaft 4, so as to realize the hinge connection with the eccentric shaft 4.

In addition, the eccentric shaft driving mechanism 11 generally includes a motor 1101, and a speed reducer 1102 in transmission connection with the motor 1101, and for the eccentric shaft driving mechanism 11 in the front end arrangement manner as shown in fig. 1, the speed reducer 1102 is also in transmission connection with one end of the eccentric shaft 4, so as to realize the rotation driving of the eccentric shaft 4 under the driving of the motor 1101.

When the variable compression ratio mechanism of the embodiment works, the eccentric shaft 4 is driven by the eccentric shaft driving mechanism 11 to rotate, so that the swinging position of the control connecting rod 9 is changed, and the upper position and the lower position of the top dead center of the piston 3 are changed through the transmission of the lower connecting rod 5 and the upper connecting rod 6, thereby realizing the adjustment of the compression ratio of the engine.

Based on the above description of the variable compression ratio mechanism, referring still to fig. 1 in conjunction with fig. 2, the mounting structure of the present embodiment is used for mounting the above variable compression ratio mechanism in the engine block 1. At this time, the mounting structure specifically includes a plurality of bearing housings arranged side by side that are attached to the engine block 1, and all of the bearing housings are attached together by the support pressing plate 10.

Further, in the present embodiment, a main bearing hole 12 is formed between one end of each bearing housing and the engine block 1, and an eccentric bearing hole 13 is formed at the other end of each bearing housing. The supporting pressing plates 10 are specifically connected to the side portions between the bearing seats arranged side by side, and the supporting pressing plates 10 are respectively provided on both sides between the bearing seats. At the same time, the support presser plate 10 is also disposed close to the eccentric bearing hole 13, that is, at the lower or bottom end position of each bearing housing, thereby also making the entire variable compression ratio mechanism more compact in structure.

In this embodiment, generally, the end of the main bearing hole 12 is the top end of the bearing seat, and the end of the eccentric shaft bearing hole 13 is the bottom end of the bearing seat. In addition, the bearing housings of the present embodiment are connected together by the support pressing plate 10, but it should be noted that, in addition to the support pressing plates 10 provided on both sides as shown in the drawing, the support pressing plate 10 may be provided only on one side between the bearing housings. However, as a preferred embodiment, the support pressure plate 10 is still generally provided on both sides.

For each bearing seat, in this embodiment, it specifically includes a seat body, and an end cover connected to the seat body. In this case, the main bearing hole 12 is formed by the base and the engine block 1, and the eccentric bearing hole 13 is formed by the base and the end cover. In the integral mounting structure, each main bearing hole 12 is specifically used for rotatably mounting the crankshaft 2, and usually a main journal of the crankshaft 2 is rotatably provided in the main bearing hole 12.

However, regarding each eccentric bearing hole 13, it should be noted that, since the eccentric shaft drive mechanism 11 of the present embodiment adopts the front end arrangement, and the eccentric shaft drive mechanism 11 is mounted on the main bearing housing at one end, that is, the first bearing housing 7 described below. The eccentric bearing hole in the first bearing block 7 is therefore used for mounting the eccentric shaft drive 11, while the eccentric bearing holes 13 in the other bearing blocks, i.e. the second bearing blocks 8 described below, are used for the rotational mounting of the eccentric shaft 4.

In this embodiment, on the basis that each bearing seat is in a split structure form composed of a seat body and an end cover, in a specific implementation, for the supporting pressing plates 10 connected to each bearing seat, the supporting pressing plates 10 on both sides may be connected between the seat bodies, or the supporting pressing plates 10 on both sides may also be connected between the end covers.

In the specific implementation, in view of the requirement that the supporting pressure plate 10 is arranged to keep a certain gap between the supporting pressure plate 10 and the motion track of the multi-link mechanism, it is ensured that no motion interference is generated, the arrangement position of the supporting pressure plate 10 should be as close as possible to the region with larger deformation of the bearing seat, and the arrangement of the supporting pressure plate 10 should make the whole variable compression ratio mechanism as compact as possible, so as to ensure the miniaturization and light weight of the whole machine, and facilitate the carrying of the whole vehicle.

At this time, as for the two connection forms of the supporting pressure plate 10, if the two connection forms are connected between the end covers, in order to satisfy the gap amount between the moving tracks of the supporting pressure plate 10 and the multi-link mechanism, the distance between the installation position of the supporting pressure plate 10 and the eccentric bearing hole 13 is inevitably increased, so that the overall size and weight of the bearing seat are increased. Therefore, as a preferred embodiment, the supporting pressure plate 10 should be connected between the seat bodies of the bearing seats, and the design of the end cap is not limited by the arrangement position of the supporting pressure plate 10, so that the structure and the size of the end cap can be optimized.

For convenience of description, in the present embodiment, as mentioned above, the plurality of bearing seats arranged side by side includes the first bearing seat 7 at one end, and the plurality of second bearing seats 8 arranged in sequence at one side of the first bearing seat 7, and the first bearing seat 7 is specifically located at the end of the engine block 1 to enable installation of the eccentric shaft driving mechanism 9. Since the engine of the present embodiment is specifically described by taking a four-cylinder engine as an example, the number of the second bearing blocks 8 is also four. In addition, a mounting portion corresponding to the eccentric shaft driving mechanism 9 is provided on the first bearing housing 7, and the mounting portion is used for mounting the eccentric shaft driving mechanism 9, and the mounting portion usually adopts a mounting hole provided on the first bearing housing 7, and as shown in fig. 2, the mounting hole is also generally provided in plural numbers around the eccentric bearing hole 13 on the first bearing housing 7.

In the present embodiment, since the eccentric shaft driving mechanism 11 is installed on the first bearing seat 7, under the influence of the structural size of the eccentric shaft driving mechanism 11, the overall outline size of the first bearing seat 7 is also larger than that of the second bearing seat 8, and particularly, for the eccentric bearing hole 13 on the first bearing seat 7, since it is specifically used for the installation of the eccentric shaft driving mechanism 11, the eccentric bearing hole 13 on the first bearing seat 7 is also larger in diameter than the eccentric bearing hole 13 on each second bearing seat 8. While the diameter of the eccentric bearing hole 13 on each second bearing block 8 is equal.

As shown in fig. 3 in combination, during engine operation, the main bearing hole 12 and the eccentric bearing hole 13 are subjected to loads F1 and F2 that are not parallel to the cylinder bore center line. The deformation of the seat body and the end in each bearing seat, and the joint surface between the seat body and the engine block 1, the separation of the joint surface between the seat body and the end cover is mainly caused by the loads F1 and F2.

Generally, when the engine is operated to the vicinity of the maximum detonation pressure time, the stress is the greatest at the main bearing hole 12 and the eccentric bearing hole 13, as shown in fig. 3. Since the main bearing hole 12 and the eccentric bearing hole 13 are offset with respect to the cylinder bore center line, and specifically, are offset toward the intake side, when the detonation pressure is maximum, the load F1 at the main bearing hole 12 is offset toward the exhaust side, in the downward direction, and the load F2 at the eccentric bearing hole 13 is offset toward the intake side, in the upward direction.

The load F1 and the load F2 cause torsional deformation of the seat body and the end cover in the bearing seat, and at the same time, when viewed from the front end of the engine, the joint surface of the bearing seat on the exhaust side and the engine block 1 tends to be separated, and the joint surface of the bearing seat on the intake side and the engine block 1 tends to be pressed. When the engine adopting the multi-link variable compression ratio mechanism works, the load acting on the main bearing hole 12 is multiplied due to different lever ratios of the mechanism, and at the moment, the bolt axial force required for preventing the joint surface between the bearing seat on the exhaust side and the engine cylinder body 1 from being separated is also larger.

Therefore, as a preferred embodiment, the present embodiment also arranges two connecting bolts on the exhaust side of each bearing seat. In addition, due to the complex operation condition of the engine, the situation that the crankshaft 2 rotates reversely at a high speed can occur in the operation process of the engine, wherein the load F1 at the main bearing hole 12 is deviated to the air inlet side and is upwards directed, and the load F2 at the eccentric bearing hole 13 is deviated to the air outlet side and is downwards directed, which is opposite to the stress situation at the maximum detonation pressure. Since the bearing seat and the engine block 1 tend to separate from each other on the intake side in this case, and the load F1 and the load F2 are also large when the crankshaft 2 is subjected to transient impact, the present embodiment also arranges two connecting bolts on the intake side of the bearing seat as a preferred embodiment, thereby providing a large bolt axial force.

From the above, it also means that each bearing seat of this embodiment is connected to the engine cylinder block 1 through two sets of connecting bolts respectively, the main bearing hole 12 is located between the two sets of connecting bolts, and each set of connecting bolts includes the inboard connecting bolt and the outboard connecting bolt that are arranged at an interval.

It should be noted that, because the base and the end cap of each bearing seat are deformed in torsion by the load F1 and the load F2, and because the top end of the base in the bearing seat is connected and fixed to the engine block 1, and there is no fixed connection point between the bottom end of the base and the end cap, the deformation amount at the lower end of the bearing seat (i.e. near the eccentric bearing hole 13) is often much larger than that at the upper end of the bearing seat. In the embodiment, the deformation of the base body and the end cover in the bearing seat can be reduced by the arrangement of the supporting pressure plate 10, so that the rigidity of the bearing seat is improved.

In this embodiment, also for convenience of description, the base and the end cap of the first bearing seat 7 are respectively referred to as a first bearing seat end cap 701 and a first bearing seat end cap 702, and similarly, the base and the end cap of the second bearing seat 8 are also respectively referred to as a second bearing seat end cap 801 and a second bearing seat end cap 802. In this case, as shown in fig. 4, as a preferred embodiment, the first bearing seat cover 702 and the first bearing seat body 701 in the first bearing seat 7 are connected by the cover connecting bolts 705 respectively disposed at both sides, and two cover connecting bolts 705 are disposed at both sides to ensure the fastening force.

Unlike the first bearing housing 7, the second bearing housing cover 802 and the second bearing housing body 801 of the second bearing housing 8 of the present embodiment are connected by an inner connecting bolt. Also, for convenience of description, in the present embodiment, the inner and outer connecting bolts at the second bearing housing 8 are referred to as a second inner connecting bolt 803 and a second outer connecting bolt 804, respectively. Similarly, the inner connecting bolt and the outer connecting bolt at the first bearing seat 7 are respectively referred to as a first inner connecting bolt 703 and a first outer connecting bolt 704.

Thus, the second bearing housing end cover 802 and the second bearing housing body 801 are connected by the second inner connecting bolts 803 on both sides, and the second bearing housing end cover 802 is finally connected to the engine block 1. The first inner connecting bolt 703 at the first bearing seat 7 is only used for connecting the first bearing seat body 701 to the engine block 1.

Except that a second inboard connecting bolt 804 is used to make the connection between the second bearing housing end cap 802 and the second bearing housing body 80. In order to make the installation structure of the present embodiment more compact, as a preferred embodiment, the supporting pressure plates 10 on both sides of the present embodiment are also connected to the second bearing seat body 801 in the second bearing seat 8 through the second outer connecting bolt 804. Therefore, on one hand, the types and the using number of the bolts can be reduced, on the other hand, the edge of the bearing seat is greatly deformed due to the fact that the bearing seat is mainly subjected to torsional deformation, the supporting pressing plate 10 is connected through the second outer side connecting bolt 804, and the supporting pressing plate 10 can be close to the area with large deformation as much as possible.

However, since the first bearing housing 7 is larger in size than the second bearing housing 8, the first outer connecting bolt 704 at the first bearing housing 7 is not used for the connection of the supporting pressure plate 10 in the present embodiment. At this time, in order to realize the connection between the supporting pressing plate 10 and the first bearing seat 7, as also shown in fig. 2, a connecting boss 7011 is disposed on the first bearing seat body 701 of the first bearing seat 7, and the supporting pressing plates 10 on both sides are connected to the corresponding connecting bosses 7011 through the pressing plate connecting bolts 706, respectively.

In this embodiment, since the diameter of the eccentric bearing hole 13 on the first bearing seat 7 is larger, as shown in fig. 2 and 4, the connecting hole for the first inner connecting bolt 703 on the first bearing seat 7 is also communicated with the inside of the eccentric bearing hole 13, so that the first inner connecting bolt 703 at the first bearing seat 7 is located in the area of the eccentric bearing hole 13 on the first bearing seat 7. It should be noted that, as a preferred embodiment, the inner connecting bolts disposed on both sides of each bearing seat and the outer connecting bolts disposed on both sides of each bearing seat of the present embodiment are symmetrically arranged about the main bearing hole 12, and for a preferred processing, the distance d1 between the two first inner connecting bolts 703 on the first bearing seat 7 and the distance d2 between the two second inner connecting bolts 803 on the second bearing seat 8 are also set to be the same.

However, in this embodiment, since the speed reducer 1102 in the eccentric shaft driving mechanism 11 is fitted in the eccentric bearing hole 13 of the first main bearing seat 7, the distance D1 between the two first outer connecting bolts 704 on the first bearing seat 7 is larger than the distance D2 between the two second outer connecting bolts 804 on the second bearing seat 8, which is limited by the structural size of the speed reducer 1102.

Considering that the front end of the first bearing seat 7 is provided with the eccentric shaft driving mechanism 11, which makes the first bearing seat 7 higher than the second bearing seat 8 in terms of stress, according to stress analysis, in order to prevent the joint surface between the first bearing seat 7 and the engine block 1 from being separated, the bolt axial force required by the first bearing seat 7 is generally about 1.5-2.5 times that of the other second bearing seats 8, therefore, in specific implementation, it should be generally noted that the specification of the connecting bolt used by the first bearing seat 7 is different from that of the connecting bolt used by the second bearing seat 8, and the specification of the connecting bolt used by the first bearing seat 7 is higher.

In practical implementation, it should be noted that, in order to reduce the development of the types of the connecting bolts, the first inner connecting bolts 703 may be configured to be the same, and similarly, the first outer connecting bolts 704 may be configured to be the same, and the second inner connecting bolts 803 and the second inner connecting bolts 804 may also be configured to be the same.

The mounting structure of the variable compression ratio mechanism of the present embodiment connects the bearing blocks into a whole by the support pressing plate 10, and can improve the support rigidity of the bearing blocks and reduce the risk of deformation of the bearing blocks, thereby improving the reliability of the variable compression ratio engine and achieving excellent practicability.

Example two

The present embodiment relates to an engine in which a variable compression ratio mechanism is provided and which is mounted in an engine block 1 by the mounting structure in the first embodiment.

Meanwhile, the variable compression ratio mechanism of the present embodiment also includes an eccentric shaft 4, a multi-link mechanism connected between the eccentric shaft 4, the crankshaft 2, and the piston 3, and an eccentric shaft drive mechanism 11. The structure of the multi-link mechanism and the eccentric shaft driving mechanism 11 can be referred to the related description of the first embodiment. Further, the installation of the variable compression ratio mechanism and the operation thereof can also be referred to the description in the first embodiment.

In the engine of the present embodiment, the variable compression ratio mechanism is mounted by the mounting structure of the first embodiment, so that the support rigidity of each bearing housing can be increased, the risk of deformation of the bearing housing can be reduced, and the reliability of the engine can be improved.

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 (12)

1. A variable compression ratio mechanism mounting structure characterized in that:

comprises a plurality of bearing seats arranged side by side and connected to an engine cylinder block (1);

all the bearing blocks are connected together by a support pressure plate (10).

2. The mounting structure of a variable compression ratio mechanism according to claim 1, characterized in that:

a main bearing hole (12) is formed between one end of each bearing seat and the engine cylinder block (1);

an eccentric bearing hole (13) is formed at the other end of each bearing seat;

the supporting pressure plate (10) is arranged close to the eccentric bearing hole (13).

3. The mounting structure of a variable compression ratio mechanism according to claim 2, characterized in that:

each bearing seat comprises a seat body and an end cover connected to the seat body;

the main bearing hole (12) is formed by the base body and the engine cylinder block (1) together;

the eccentric bearing hole (13) is formed by the base body and the end cover together.

4. The mounting structure of a variable compression ratio mechanism according to claim 3, characterized in that:

the supporting pressure plate (10) is connected between the base bodies; alternatively, the first and second electrodes may be,

the supporting pressure plate (10) is connected between the end covers.

5. The mounting structure of a variable compression ratio mechanism according to claim 3, characterized in that:

the bearing block is connected to the engine cylinder block (1) through two groups of connecting bolts;

the main bearing hole (12) is positioned between the two groups of connecting bolts;

each group of connecting bolts comprises inner side connecting bolts and outer side connecting bolts which are arranged at intervals.

6. The mounting structure of a variable compression ratio mechanism according to claim 5, characterized in that:

the bearing seats comprise a first bearing seat (7) positioned at one end and a plurality of second bearing seats (8) sequentially arranged on one side of the first bearing seat (7);

and the first bearing seat (7) is provided with an installation part corresponding to the eccentric shaft driving mechanism (11).

7. The mounting structure of a variable compression ratio mechanism according to claim 6, characterized in that:

the end cover in the first bearing seat (7) is connected with the seat body through an end cover connecting bolt (705);

the end cover in the second bearing seat (8) is connected with the seat body through the inner side connecting bolt.

8. The mounting structure of a variable compression ratio mechanism according to claim 6, characterized in that:

the supporting pressure plate (10) is connected with the seat bodies in all the second bearing seats (8) through the outer side connecting bolts;

a connecting boss (7011) is arranged on the seat body in the first bearing seat (7);

the supporting pressure plate (10) is connected with the connecting boss (7011) through a pressure plate connecting bolt (706).

9. The mounting structure of a variable compression ratio mechanism according to any one of claims 6 to 8, characterized in that:

the two inner connecting bolts on the same bearing seat are symmetrically arranged relative to the main bearing hole (12), and the two outer connecting bolts on the same bearing seat are symmetrically arranged relative to the main bearing hole (12); and the number of the first and second electrodes,

the distance (d1) between the inboard connecting bolts on both sides on the first bearing seat (7) is the same as the distance (d2) between the inboard connecting bolts on both sides on the second bearing seat (8);

the distance (D1) between the outer connecting bolts on both sides of the first bearing seat (7) is greater than the distance (D2) between the outer connecting bolts on both sides of the second bearing seat (8).

10. An engine provided with a variable compression ratio mechanism, characterized in that: the variable compression ratio mechanism is mounted in an engine block (1) by a mounting structure of the variable compression ratio mechanism according to any one of claims 1 to 9.

11. The engine of claim 10, wherein:

the variable compression ratio mechanism comprises an eccentric shaft (4), a multi-link mechanism connected among a piston (3), a crankshaft (2) and the eccentric shaft (4), and an eccentric shaft driving mechanism (11);

the multi-connecting-rod mechanism comprises a lower connecting rod (5) rotatably arranged on the crankshaft (2), an upper connecting rod (6) hinged between the lower connecting rod (5) and the piston (3), and a control connecting rod (9) hinged between the lower connecting rod (5) and the eccentric shaft (4).

12. The engine of claim 11, wherein:

the eccentric shaft driving mechanism (11) comprises a motor (1101) and a speed reducer (1102) in transmission connection with the motor (1101);

the speed reducer (1102) is connected with one end of the eccentric shaft in a transmission way.

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