CN213743571U

CN213743571U - Supporting seat of variable compression ratio mechanism and variable compression ratio mechanism

Info

Publication number: CN213743571U
Application number: CN202022749948.0U
Authority: CN
Inventors: 刘涛; 刘君宇; 张树旻; 渠娜; 尹吉; 杨乐; 钟德华; 苏旭朝; 王文远; 赵凯
Original assignee: Great Wall Motor Co Ltd
Current assignee: Great Wall Motor Co Ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-07-20
Anticipated expiration: 2030-11-24

Abstract

The utility model provides a supporting seat and variable compression ratio mechanism for variable compression ratio mechanism, the bottom of supporting seat is equipped with the lower part recess, the lower part recess is used for forming the confession the drive unit mounting hole of variable compression ratio mechanism's drive unit installation, and in at least one side at supporting seat top is equipped with deep floor, deep floor has the outline of slope form, just the outline to the extension line of lower part recess direction passes through the center of drive unit mounting hole, perhaps, the extension line by near the center of drive unit mounting hole passes through. The utility model discloses a supporting seat passes through both sides deep floor's setting, and makes its outline extension line pass through near the center or the center of drive unit mounting hole, can do benefit to the transmission of supporting seat atress to engine cylinder body, or can reduce the influence of supporting seat atress to drive unit transmission precision to be favorable to ensureing the reliable operation of variable compression ratio mechanism.

Description

Supporting seat of variable compression ratio mechanism and variable compression ratio mechanism

Technical Field

The utility model relates to the technical field of engines, in particular to supporting seat of variable compression ratio mechanism, simultaneously, the utility model discloses still relate to a variable compression ratio mechanism that has above supporting seat.

Background

When the engine works, the defects of low fuel efficiency, poor economy and high emission are inevitably caused if the same compression ratio is adopted for different working conditions and loads, and the variable compression ratio technology is developed to overcome the defects of a single compression ratio.

Among various types of variable compression ratio mechanisms, a multi-link variable compression ratio mechanism, which employs a driving unit having an eccentric shaft in cooperation with a multi-link mechanism so as to be driven by the multi-link mechanism when the eccentric shaft is driven to rotate, thereby achieving a change in the top dead center of an engine piston, has become a research and development direction for many vehicles and enterprises. However, the existing variable compression ratio mechanism also has the disadvantages that the stress is not favorable for transmission to the engine block, the transmission precision of the driving unit is reduced due to the rotation tendency of the stress, and the like, for the supporting structure for supporting the eccentric shaft in the driving unit when the engine is running, thereby affecting the reliability of the operation of the variable compression ratio mechanism.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a supporting seat for a variable compression ratio mechanism, so as to ensure the reliability of the operation of the variable compression ratio mechanism.

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

a supporting seat for a variable compression ratio mechanism is characterized in that a lower groove is formed in the bottom of the supporting seat and used for forming a driving unit mounting hole for mounting a driving unit of the variable compression ratio mechanism, a reinforcing rib plate is arranged on at least one side of the top of the supporting seat, the reinforcing rib plate is provided with an inclined outer contour, and an extension line of the outer contour towards the direction of the lower groove passes through the center of the driving unit mounting hole or passes through the vicinity of the center of the driving unit mounting hole.

Furthermore, the two sides of the top of the supporting seat are respectively provided with the reinforcing rib plates.

Furthermore, lightening holes are formed in the reinforcing rib plate on at least one side.

Furthermore, an upper groove is formed in the top of the supporting seat and used for forming a crankshaft mounting hole for mounting a crankshaft, and the upper groove and the lower groove are both semicircular grooves.

Further, the distance between the extension line of the outer contour of the reinforcing rib plate and the center of the driving unit mounting hole is within 2 mm.

Furthermore, the supporting seat is provided with connecting parts which are respectively arranged on two opposite sides of the supporting seat, and the connecting parts are used for forming the connecting arrangement of the supporting seat in the engine cylinder body.

Further, the connecting parts on each side are two connecting parts arranged at intervals.

Furthermore, the connecting part is a connecting hole arranged on the supporting seat.

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

supporting seat pass through both sides deep floor's setting, and make its outline extension line pass through near the center or the center of drive unit mounting hole, can do benefit to the transmission of supporting seat atress to engine cylinder body, or can reduce the influence of supporting seat atress to drive unit transmission precision to be favorable to ensureing the reliable operation of variable compression ratio mechanism.

Another object of the utility model is to provide a variable compression ratio mechanism installs on engine cylinder body to including piston, bent axle, drive unit, one end with the articulated executive connecting rod that links to each other of piston, one end with drive unit rotates the drive connecting rod of connecting, and rotates and locates bent epaxial both ends respectively with the executive connecting rod reaches the drive connecting rod rotates the adjusting connecting rod that links to each other, just have in the engine cylinder body as above the supporting seat, the bottom of supporting seat corresponds lower part groove connection has the support lid, the drive unit mounting hole enclose configuration become in the supporting seat with support between the lid.

Further, the driving unit comprises an eccentric shaft rotatably mounted in the mounting hole of the driving unit, and a motor and a speed reducer connected to one end of the eccentric shaft and disposed facing the eccentric shaft, the motor, the speed reducer and the eccentric shaft are sequentially connected in series, the driving connecting rod is rotatably connected to the eccentric shaft, and the motor and the speed reducer are disposed at the front end of the engine cylinder.

The utility model discloses a variable compression ratio mechanism can do benefit to the transmission of supporting seat atress to engine cylinder body through using foretell supporting seat, or reduces the influence of supporting seat atress to the drive unit transmission precision, and can ensure the reliability of variable compression ratio mechanism operation.

In addition, the motor and the speed reducer are arranged oppositely, and are arranged at the front end of the engine, so that the occupied space of the engine can be reduced, and the whole vehicle carrying is facilitated.

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

fig. 2 is a schematic diagram of a driving unit according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a support seat according to an embodiment of the present invention;

fig. 4 is a schematic view of the supporting seat according to the embodiment of the present invention;

description of reference numerals:

1. an engine block; 2. a piston; 3. an execution connecting rod; 4. a crankshaft; 5. adjusting the connecting rod; 6. a drive link; 7. an eccentric shaft; 8. a connecting rod journal; 9. a diaphragm plate; 10. a supporting seat; 11. a motor; 12. a speed reducer; 13. a first bolt; 14. a second bolt; 15. a support cover; 16. a crankshaft mounting hole; 17. a drive unit mounting hole; 18. a third bolt;

1001. a lower groove; 1002. an upper groove; 1003. a first reinforcing rib plate; 1004. a second reinforcing rib plate; 1005. a first connection hole; 1006. and a second connection hole.

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", "outer", 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. Furthermore, the appearances of the terms first, second, etc. in this specification are not necessarily all referring to the same item, but are instead intended to cover the same item.

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

The present embodiment relates to a support base for a variable compression ratio mechanism, and also relates to a variable compression ratio mechanism having the support base, in which case, first, it is specific to the variable compression ratio mechanism, that is, a multi-link type variable compression ratio mechanism including a drive unit having an eccentric shaft, and a multi-link mechanism provided in cooperation with the drive unit.

Also, as shown in fig. 1 and 2, as an exemplary structure of the multi-link type variable compression ratio mechanism of the present embodiment, the mechanism is mounted on the engine block 1 and integrally constructed to include a piston 2 and a crankshaft 4, a driving unit, an actuating link 3 having one end hinge-connected to the piston 2, a driving link 6 having one end rotatably connected to the driving unit, and an adjusting link 5 rotatably provided on the crankshaft 4 and having both ends rotatably connected to the actuating link 3 and the driving link 6, respectively.

The adjusting connecting rod 3 is rotatably mounted on a connecting rod journal 8 of the crankshaft 4, the actuating connecting rod 3 and the piston 2, and the actuating connecting rod 3, the driving connecting rod 6 and the adjusting connecting rod 5 are rotatably connected through connecting rod pins, and the crankshaft 4 is rotatably disposed in the engine cylinder block 1 through a main journal thereof and is rotatably mounted in a crankshaft mounting hole 16 described below. The center of the main journal of the crankshaft 4 is offset to one side with respect to the cylinder hole center P, and the center of the main journal of the eccentric shaft 7 described below is also offset to the cylinder hole center P, and the offset directions of the two are the same.

The driving unit of this embodiment specifically includes an eccentric shaft 7, and a motor 11 and a reducer 12 connected to one end of the eccentric shaft 7 and disposed facing each other, and the motor 11, the reducer 12 and the eccentric shaft 7 are connected in series in sequence, so that when the motor 11 receives the command from the engine control unit to rotate, the reducer 12 reduces the speed to drive the eccentric shaft 7 to rotate synchronously.

It should be noted that the speed reducer 12 of the present embodiment may be a harmonic speed reducer, and the specific connection form between the motor 11, the speed reducer 12 and the eccentric shaft 7 can be directly referred to the related report in the prior art. In the present embodiment, the eccentric shaft 7 is rotatably mounted in the below-described driving unit mounting hole 17, and the driving link 6 is also rotatably connected to the eccentric shaft 7, and at the same time, the motor 11 and the reducer 12, which are disposed facing each other, may be disposed at the front end of the engine block 1 as a preferable arrangement.

At this time, the front end of the engine block 1 described above, that is, the end close to the head of the automobile in the state where the engine is mounted on the automobile body. The motor 11 and the reducer 12 are disposed facing each other, and the motor 11 and the reducer 12 are disposed at the front end of the engine, so that the occupied space of the engine can be reduced, and the whole vehicle carrying is facilitated.

Referring to fig. 3, the supporting seat 10 of the present embodiment is configured such that a lower recess 1001 is formed at the bottom of the supporting seat 10, and the lower recess 1001 is specifically configured to form a driving unit mounting hole 17 for mounting the eccentric shaft 7 in the driving unit. In addition to the lower recess 1001, an upper recess 1002 is provided at the top of the support base 10, and the upper recess 1002 is used to form a crankshaft mounting hole 16 for mounting the crankshaft 4. In addition, the upper recess 1002 and the lower recess 1001 of the present embodiment are both semicircular grooves.

Referring again to fig. 4, specifically, when the support base 10 is assembled in the engine block 1, a support cover 15 is also coupled to the bottom of the support base 10 corresponding to the lower recess 1001, the support cover 15 is fixedly coupled to the support base 10 by a plurality of third bolts 18, and a semicircular recess is also provided in the support cover 15 corresponding to the semicircular lower recess 1001, and the above-mentioned driving unit mounting hole 17 is formed around between the support base 10 and the support cover 15.

In this embodiment, the crankshaft mounting hole 16 is formed around the support base 10 and the engine block 1 in the same manner as the driving unit mounting hole 17. In addition, in addition to the semicircular grooves respectively located at the bottom and the top, reinforcing rib plates are respectively disposed at two sides of the top of the supporting seat 10 in this embodiment, and for convenience of description, the reinforcing rib plates at two sides are also referred to as a first reinforcing rib plate 1003 and a second reinforcing rib plate 1004, respectively. At the same time, the reinforcing plates on both sides also have inclined outer contours, and as shown in fig. 4, the extension m of the outer contour of the first reinforcing plate 1003 in the direction of the lower recess 1001 and the extension n of the outer contour of the second reinforcing plate 1004 in the direction of the lower recess 1001 both pass through the center C of the drive unit mounting hole 17 or both pass near the center C of the drive unit mounting hole 17.

In fig. 4, it is shown that the extension line m and the extension line n pass through the vicinity of the center C, and in the present embodiment, with respect to the vicinity of the center C, it is specifically a perpendicular distance between the extension line of the outer profile of the gusset and the center C of the drive unit mounting hole 17 that is within 2mm, and it may be, for example, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, or 2mm from the perpendicular distance between the centers C. However, it is preferable that the perpendicular distance between the extension line of the outer contour of each rib plate and the center C of the drive unit mounting hole 17 is 0, that is, the extension line passes through the center C.

It should be noted that, of course, in addition to the case where the extension line m and the extension line n both pass through the center C or both pass near the center C, one of the two may pass through the center C and the other may pass near the center C. It is also possible to provide a reinforcing plate only on one side of the support base 10 if the conditions permit, but in a preferred form, the reinforcing plate is provided on both sides at the same time.

In this embodiment, in order to facilitate the lightweight of the support seat 10, lightening holes are also provided at the reinforcing rib plate on at least one side, and the design of the lightening holes is such that the structural reinforcing effect of the reinforcing rib plate is not affected. In addition, the present embodiment further provides the connecting portions disposed on two opposite sides of the supporting seat 10, which are used to constitute the connecting arrangement of the supporting seat 10 in the engine block 1.

In a preferred embodiment, the connecting portions on each side are two spaced apart, and each connecting portion is designed as a connecting hole provided in the support base 10. For convenience of description, the connection holes at two sides are referred to as a first connection hole 1005 and a second connection hole 1006 respectively, and when assembling, the support base 10 is connected to the diaphragm 9 in the engine block 1 via a first bolt 13 inserted into the first connection hole 1005 and a second bolt 14 inserted into the second connection hole 1006.

When the variable compression ratio mechanism of the embodiment works, based on the operating condition of the engine, the motor 11 rotates to drive the eccentric shaft 7 to rotate, the rotation of the eccentric shaft 7 can finally drive the piston 2 to move up and down through the transmission of the multi-connecting-rod mechanism consisting of the driving connecting rod 6, the adjusting connecting rod 5 and the executing connecting rod 3, and therefore the top dead center of the piston 2 can be changed, and the variable adjustment of the compression ratio of the engine can be realized.

When the engine is operated and the variable compression ratio mechanism is operated to the vicinity of the maximum detonation pressure time, the force applied to the variable compression ratio mechanism is the maximum, and at this time, the force F1 biased toward the exhaust side acts on the main journal center B of the crankshaft 4 and is directed so as not to be parallel to the cylinder bore center P. The eccentric shaft 7 of the drive unit has a force F2 acting at its center C, which is biased toward the intake side, and is directed upward and not parallel to the cylinder hole center P.

The forces F1 and F2 have an influence on the support seat 10, and the left side of the main journal of the crankshaft 4, i.e. the exhaust side, has a tendency to separate from the joint surface of the support seat 10 with the engine block 1 when viewed from the front end of the engine, while the joint surface of the support seat 10 with the engine block 1 has a tendency to be pressed on the intake side. At this time, the rib plates 1004 on the intake side are subjected to a compressive force and the rib plates 1003 on the exhaust side are subjected to a tensile force due to the fastening force of the first bolts 13 and the second bolts 14.

Since the force F1 acting on the main journal of the crankshaft 4 and the force F2 acting on the center of the eccentric shaft 7 are both large, the stiffness of the pay-off base 10 can be increased by the reinforcing rib plates on both sides in the present embodiment to reduce the amount of deformation under a stress state, and at the same time, a sufficient fastening force to the support base 10 can be ensured by the arrangement of the two connecting portions on both sides.

In the present embodiment, the outer contour extension m of the first reinforcing rib plate 1003 and the outer contour extension n of the second reinforcing rib plate 1004 pass through the center C or the vicinity thereof, so that the arrangement direction of the second reinforcing rib plate 1004 can be the same as the direction of the force F2, and the force F2 can be better transmitted to the engine block 1. Meanwhile, the moment generated by the maximum tensile force F3 borne by the first reinforcing rib plate 1003 on the exhaust side relative to the center C is reduced, so that the overall rotation tendency of the driving unit caused by the moment is reduced, and the transmission precision of the driving unit is guaranteed.

In summary, the supporting seat 10 of the present embodiment, particularly the variable compression ratio mechanism using the supporting seat 10, can facilitate the transmission of the force applied to the supporting seat 10 to the engine block 1, can reduce the influence of the force applied to the supporting seat 10 on the transmission precision of the driving unit, can ensure the reliability of the operation of the variable compression ratio mechanism, and has good practicability.

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

1. The utility model provides a supporting seat for variable compression ratio mechanism which characterized in that: the bottom of the supporting seat (10) is provided with a lower groove (1001), the lower groove (1001) is used for forming a driving unit mounting hole (17) for mounting a driving unit of the variable compression ratio mechanism, at least one side of the top of the supporting seat (10) is provided with a reinforcing rib plate, the reinforcing rib plate is provided with an inclined outer contour, and an extension line of the outer contour towards the direction of the lower groove (1001) passes through the center C of the driving unit mounting hole (17), or the extension line passes through the vicinity of the center C of the driving unit mounting hole (17).

2. The support seat for a variable compression ratio mechanism according to claim 1, characterized in that: the two sides of the top of the supporting seat (10) are respectively provided with the reinforcing rib plates.

3. The support seat for a variable compression ratio mechanism according to claim 2, characterized in that: lightening holes are formed in the reinforcing rib plate on at least one side.

4. The support seat for a variable compression ratio mechanism according to claim 1, characterized in that: an upper groove (1002) is formed in the top of the supporting seat (10), the upper groove (1002) is used for forming a crankshaft mounting hole (16) for mounting a crankshaft (4), and the upper groove (1002) and the lower groove (1001) are both semicircular grooves.

5. The support seat for a variable compression ratio mechanism according to claim 1, characterized in that: the distance between the extension line of the outer contour of the reinforcing rib plate and the center C of the driving unit mounting hole (17) is within 2 mm.

6. The support seat for a variable compression ratio mechanism according to any one of claims 1 to 5, wherein: the supporting seat (10) is provided with connecting parts which are respectively arranged on two opposite sides of the supporting seat, and the connecting parts are used for forming the connecting arrangement of the supporting seat (10) in the engine cylinder body (1).

7. The support seat for a variable compression ratio mechanism according to claim 6, wherein: the connecting parts on each side are two in interval arrangement.

8. The support seat for a variable compression ratio mechanism according to claim 6, wherein: the connecting part is a connecting hole arranged on the supporting seat (10).

9. The utility model provides a variable compression ratio mechanism installs on engine cylinder body (1) to including piston (2), bent axle (4), drive unit, one end with piston (2) articulated actuating connecting rod (3) that link to each other, one end with drive unit rotates drive connecting rod (6) of connecting, and rotate and locate both ends on bent axle (4) respectively with actuating connecting rod (3) and drive connecting rod (6) rotate continuous regulation connecting rod (5), its characterized in that: the engine block (1) having therein the support base (10) of any one of claims 1 to 8, a support cover (15) being attached to a bottom of the support base (10) corresponding to the lower recess (1001), the drive unit mounting hole (17) being formed around between the support base (10) and the support cover (15).

10. The variable compression ratio mechanism according to claim 9, characterized in that: the driving unit comprises an eccentric shaft (7) rotatably mounted in a driving unit mounting hole (17), and a motor (11) and a speed reducer (12) which are connected to one end of the eccentric shaft (7) and are arranged facing the eccentric shaft (7), the motor (11), the speed reducer (12) and the eccentric shaft (7) are sequentially connected in series, the driving connecting rod (6) is rotatably connected to the eccentric shaft (7), and the motor (11) and the speed reducer (12) are arranged at the front end of the engine cylinder body (1).