CN217422003U - Hydraulic suspension - Google Patents

Abstract

The utility model provides a hydraulic suspension, which is provided with a rubber main spring contained in a shell, wherein the rubber main spring is connected with a connecting component, the part of the connecting component extends out of the shell, and a buffer mechanism is arranged on the connecting component; the buffer mechanism is positioned between the rubber main spring and the shell, and the bottom of the buffer mechanism is abutted against the rubber main spring; the damping mechanism further has a first damping portion between the connecting member and the housing, and a second damping portion between a side portion of the rubber main spring and the housing. The utility model discloses a hydraulic suspension through setting up solitary buffer gear, can realize the independent adjustment of buffer gear material to improve buffer gear's wearability, and set up first buffering portion, can avoid taking place rigid contact between rubber main spring and the casing, and then reduce the possibility that rubber main spring takes place the fracture condition, and simultaneously, set up second buffering portion, can also avoid coupling assembling and the rigid contact of casing and take place wearing and tearing, thereby effectively improve this hydraulic suspension's life.

Description

Hydraulic suspension

Technical Field

The utility model relates to a vehicle parts technical field, in particular to hydraulic suspension.

Background

Suspension (Mount) is an automotive powertrain component for reducing and controlling the transmission of engine vibrations and for supporting, i.e., it is a bi-directional vibration isolation element that provides restraint and protection against vehicle motion tendencies. The suspension types include rubber suspension, hydraulic suspension, semi-active suspension, active suspension and the like.

The suspension function may specifically be: firstly, fixing and supporting an automobile power assembly; bearing reciprocating inertia force and moment generated by the rotation of the engine and the balance mass in the power assembly; bearing all dynamic forces acting on the power assembly in the running process of the automobile; isolating the vibration of the frame or the body caused by the excitation of the engine; isolating the vibration of the vehicle body caused by the road surface unevenness and the road surface impact on the wheels, and avoiding the transmission of vibration excitation to the power assembly.

The existing hydraulic mount has the problems of high cracking risk of a rubber main spring, high noise of a leather cup slapping a runner plate and weaker damping performance, and the overall using effect of the hydraulic mount is influenced.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention is directed to a hydraulic mount to reduce the risk of cracking of a rubber main spring, and to have a long service life.

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

a hydraulic suspension is provided with a rubber main spring contained in a shell, the rubber main spring is connected with a connecting component partially extending out of the shell, and a buffer mechanism is arranged on the connecting component; the buffer mechanism is positioned between the rubber main spring and the shell, and the bottom of the buffer mechanism is abutted against the rubber main spring; the damper mechanism has a first damper portion between the connecting assembly and the housing, and a second damper portion between a side portion of the main rubber spring and the housing.

Furthermore, the buffer mechanism comprises a buffer block sleeved on the connecting component; the first buffer part is formed by turning over the inner side of the buffer block towards one side of the shell, and the second buffer part is formed by turning over the outer side of the buffer block towards one side of the rubber main spring.

Further, the first buffer part is in interference fit with the connecting assembly; and/or, the buffer block is embedded to have the skeleton, just the skeleton has to extend respectively to first buffer with extension limit in the second buffer.

Furthermore, the shell is provided with a lower shell and an upper shell which are buckled and connected along the height direction of the shell, a main spring support for supporting the rubber main spring is clamped between the upper shell and the lower shell, and flanges formed by outwards turning the main spring support, the upper shell and the lower shell are arranged at the connected ends of the main spring support and the upper shell; the flanges are attached to each other, and a bent edge which is bent towards the lower shell and rivets the flanges together is formed on the flanges of the upper shell.

Furthermore, the hydraulic suspension is also provided with a leather cup which is accommodated in the lower shell and is matched with the rubber main spring to form a liquid chamber, and the hydraulic suspension is provided with a flow channel assembly which is positioned between the leather cup and the rubber main spring, and one side of the leather cup facing the flow channel assembly is provided with a second bulge.

Further, the second bellying includes edge first protruding unit and the protruding unit of second of the radial interval arrangement of leather cup, first protruding unit includes the edge a plurality of second of leather cup circumference interval arrangement are protruding, just the protruding unit of second includes the edge a plurality of third of leather cup circumference interval arrangement are protruding.

Further, the second protrusion is arc-shaped; and/or the second protrusion units are two units which are arranged along the radial direction of the leather cup at intervals.

Furthermore, the runner assembly comprises an upper runner plate and a lower runner plate which are arranged up and down, wherein the lower runner plate is provided with a plug-in bulge, the upper runner plate is provided with a slot, and the plug-in bulge passes through a decoupling film between the lower runner plate and the upper runner plate and is plugged in the slot.

Further, the inserting projection is arranged close to the axis of the lower runner plate; and/or the insertion bulges are arranged along the circumferential direction of the lower runner plate at intervals; and/or the part of the insertion bulge penetrating through the decoupling film is in clearance arrangement with the decoupling film, and the part of the insertion bulge inserted in the slot is in interference fit with the slot.

Further, a first boss abutting against the shell is arranged at the top of the buffer mechanism, and the first boss comprises a plurality of first protrusions arranged at intervals along the circumferential direction of the connecting assembly; and/or a plurality of reinforcing ribs which are arranged along the circumferential direction of the connecting assembly at intervals are formed between the first buffer part and the body of the buffer mechanism.

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

hydraulic suspension, through setting up buffer gear alone, but the buffer gear material of independent adjustment to improve buffer gear's wearability, simultaneously, set up first buffering portion, can avoid taking place rigid contact between rubber main spring and the casing, and lead to rubber main spring to take place the fracture condition, and through setting up second buffering portion, can also avoid coupling assembling and the rigid contact of casing and take place wearing and tearing, and then improve this hydraulic suspension's life and result of use.

In addition, set up the skeleton, can ensure that first buffer and coupling assembling cooperation are firm, avoid not hard up. Go up the casing, main spring support and rivet between the casing down and link to each other, connect spare part quantity few, the leakproofness is good, can reduce the weeping risk. Set up the second bellying on the leather cup, then can effectively reduce the leather cup and clap the noise of runner subassembly. Simultaneously, set up first bellying at buffer gear's top, can be at first through first bellying butt casing when buffer gear contacts the casing, and avoid the condition of taking place the abnormal sound between the two.

In addition, the insertion protrusions and the insertion grooves are matched for use, and the insertion protrusions are arranged close to the axis of the lower runner plate, so that when the decoupling membrane is greatly influenced by action, the middle parts of the upper runner plate and the lower runner plate are prevented from being deformed, and the damping performance of the hydraulic suspension is prevented from being influenced.

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 overall structure diagram of a hydraulic mount according to an embodiment of the present invention;

fig. 2 is a schematic view of an internal structure of a buffer block according to an embodiment of the present invention;

fig. 3 is a schematic perspective view of a buffer block according to an embodiment of the present invention;

fig. 4 is a schematic structural view of a leather cup according to an embodiment of the present invention;

fig. 5 is a schematic view of an internal structure of a flow channel assembly according to an embodiment of the present invention;

FIG. 6 is a partial enlarged view of portion A of FIG. 5;

fig. 7 is a schematic perspective view of a flow channel assembly according to an embodiment of the present invention;

fig. 8 is a schematic structural view of a lower flow field plate according to an embodiment of the present invention;

fig. 9 is a schematic structural view of an upper flow passage plate according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a decoupling film according to an embodiment of the present invention.

Description of reference numerals:

1. a housing; 101. a lower housing; 102. an upper housing; 1021. bending the edges;

2. a rubber main spring; 3. a connection assembly; 301. an inner core; 302. a connecting member;

4. a buffer block; 401. a first buffer section; 402. a second buffer section; 403. a framework; 404. a first protrusion; 405. reinforcing ribs; 406. mounting holes;

5. a main spring support; 6. a leather cup; 601. a second boss; 6011. a second protrusion; 6012. a third protrusion;

7. a flow channel assembly; 701. an upper flow path plate; 7011. inserting slots; 702. a lower flow field plate; 7021. inserting the bulge;

8. a decoupling membrane; 801. a via hole;

9. a liquid chamber; 10. a dust cover.

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", "front", "rear", "left", "right", "top", "bottom" and the like 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 and operated in a specific orientation, 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.

In addition, in the description of the present invention, the terms "mounted," "connected," and "connected" 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.

The utility model relates to a hydraulic suspension, on overall structure, has the rubber main spring 2 who holds in casing 1 among this hydraulic suspension, and rubber main spring 2 is connected with the part and stretches out the coupling assembling 3 outside casing 1 to be equipped with buffer gear on coupling assembling 3.

A main spring support 5 is arranged in the housing 1 to support the rubber main spring 2, and a cup 6 is arranged in the housing 1 and cooperates with the rubber main spring 2 to form a liquid chamber 9, a flow channel assembly 7 is arranged between the cup 6 and the rubber main spring 2, and a decoupling film 8 is arranged in the flow channel assembly 7.

It should be noted that the top and bottom of the present embodiment refer to the top and bottom in the state shown in fig. 1, and in the specific implementation, the dust cover 10 is further disposed on the top of the housing 1, and various structures not mentioned in the present embodiment can refer to a hydraulic suspension product commonly in the prior art, and are not described herein again.

Based on the above general description, in the present embodiment, as a preferred embodiment, as shown in fig. 1, the connecting assembly 3 in the present embodiment includes an inner core 301 integrally formed with the main rubber spring 2, and a connecting member 302 provided in the inner core 301.

In practice, the housing 1 is generally press-fitted to a vehicle body, the connecting member 302 is used to connect to a powertrain mounted on the vehicle body, and the core 301 and the connecting member 302 are preferably made of related structural products commonly used in the art, such as bolts used for the connecting member 302.

Preferably, the damper mechanism of the present embodiment is located between the rubber main spring 2 and the housing 1 with the bottom of the damper mechanism abutting against the rubber main spring 2, and has a first damper portion 401 located between the connection assembly 3 and the housing 1, and a second damper portion 402 located between the side of the rubber main spring 2 and the housing 1.

As shown in fig. 1 to 3, in a specific implementation, the buffering mechanism includes a buffering block 4 sleeved on the connecting assembly 3, and the first buffering portion 401 is formed by folding the inside of the buffering block 4 toward the side of the housing 1, and the second buffering portion 402 is formed by folding the outside of the buffering block 4 toward the side of the rubber main spring 2.

Here through setting up first buffer 401, can avoid taking place rigid contact between rubber main spring 2 and the casing 1, and lead to the rubber main spring 2 to take place the condition of ftractureing, simultaneously, through setting up second buffer 402, can also avoid coupling assembling 3 and the rigid contact of casing 1 and take place wearing and tearing to effectively improve this hydraulic suspension's life.

It is worth mentioning that the top of the above-mentioned buffer mechanism is used to abut against the housing 1 when the connecting component 3 drives the buffer mechanism to move, so as to prevent the rubber main spring 2 from directly colliding with the housing 1 and being damaged. That is, in practical application, based on the difference of the motion state of the connecting assembly 3 relative to the housing 1 (that is, the movement of the connecting assembly 3 relative to the housing 1 in the X direction, the Y direction or the Z direction of the housing 1), the top of the buffer mechanism and the housing 1 are switched among clearance fit, abutting fit and interference fit, so that the protection of the rubber main spring 2 is formed on the premise of being capable of adapting to different use environments.

Specifically, in the hydraulic mount of the present embodiment, when in use, the side portion (the side facing the housing 1) and the top portion of the second buffer portion 402 are both used to prevent the rubber main spring 2 from directly contacting the housing 1 to protect the rubber main spring 2, and depending on the movement state of the connecting assembly 3 relative to the housing 1, the side portion and the top portion of the second buffer portion 402 may be in contact with the housing 1, may be in contact with each other at the same time, or may not be in contact with each other at the same time.

On the other hand, the first buffer 401 is in clearance fit with the housing 1 when the connection assembly 3 is held stationary with respect to the housing 1, and depending on the movement state of the connection assembly 3 with respect to the housing 1, a side portion (a side facing the housing 1) of the first buffer 401 may abut against the housing 1 to avoid a hard collision between the connection assembly 3 and the housing 1.

In specific implementation, referring to fig. 3, a mounting hole 406 is formed in the middle of the buffer block 4, so that the buffer block 4 is sleeved on the connecting assembly 3. The first buffer portion 401 is in interference fit with the connecting assembly 3, and a frame 403 is embedded in the buffer block 4, and the frame 403 has extending edges respectively extending into the first buffer portion 401 and the second buffer portion 402.

The framework 403 is arranged, so that the whole structure of the buffer block 4 can be effectively supported, the first buffer part 401 can be firmly matched with the connecting assembly 3, and the actual damping effect of the hydraulic suspension due to looseness between the buffer block 4 and the connecting assembly 3 is avoided.

As shown in fig. 1, the housing 1 of the present embodiment has a lower housing 101 and an upper housing 102 that are connected in a snap-fit manner along the height direction thereof, the main spring support 5 of the present embodiment is sandwiched between the upper housing 102 and the lower housing 101, and preferably, the ends of the main spring support 5, the upper housing 102 and the lower housing 101 that are connected are respectively provided with flanges that are formed by being folded outwardly, and the flanges are attached to each other, and the flanges of the upper housing 102 are provided with bent edges 1021 that are bent toward the lower housing 101 and rivet the flanges together.

So set up, owing to only rivet shell 102, main spring support 5 and lower casing 101, it is small in quantity to connect spare part for the leakproofness in the casing 1 is better, and can reduce the weeping risk, thereby improves this hydraulic mount's result of use.

In practical application, the main spring support 5 and the rubber main spring 2 are integrally formed by vulcanization, and as shown in fig. 1, rubber is vulcanized on the portions of the flanges of the main spring support 5, which are abutted to the upper shell 102 and the lower shell 101, so that the abrasion between the flanges can be reduced, and the service life and the use effect of the hydraulic mount can be improved.

Preferably, as shown in fig. 1 and 4, a second protrusion 601 is provided on a side of the cup 6 facing the runner assembly 7, so that when the cup 6 is operated by an external operation, the second protrusion 601 can be brought into contact with the runner assembly 7, thereby reducing a contact area between the cup 6 and the runner assembly 7, and further effectively reducing noise generated when the cup 6 slaps the runner assembly 7, thereby improving overall sound insulation and noise reduction performance.

And to further improve the noise reduction effect of the second protruding portion 601, as also shown in fig. 4, the second protruding portion 601 includes a first protruding unit and a second protruding unit that are arranged at intervals in the radial direction of the leather cup 6, the first protruding unit includes a plurality of second protrusions 6011 that are arranged at intervals in the circumferential direction of the leather cup 6, and the second protruding unit includes a plurality of third protrusions 6012 that are arranged at intervals in the circumferential direction of the leather cup 6.

In specific implementation, in order to ensure that the second protrusion 6011 and the third protrusion 6012 have good abutting effects, the second protrusion 6011 is preferably configured to be arc-shaped, and meanwhile, the second protrusion unit is preferably configured to be two units spaced apart from each other in the radial direction of the leather cup 6.

Here, the second projection 6011 is provided in an arc shape in consideration of a large deformation dimension of the middle portion of the cup 6 when subjected to an external operation, so as to increase an abutting area to form an effective support for the middle portion of the cup 6. Of course, the number and arrangement of the second protrusions 6011 and the third protrusions 6012 may be correspondingly set and adjusted according to the actual noise reduction requirement, for example, the third protrusions 6012 may also be set to be arc-shaped, or, for example, the second protrusions 6011 may be set to be four, five, or six.

Preferably, as shown in fig. 1, 5 and 6, the flow channel assembly 7 of the present embodiment includes an upper flow channel plate 701 and a lower flow channel plate 702 which are arranged up and down, wherein an insertion protrusion 7021 is provided on the lower flow channel plate 702, and a slot 7011 is provided on the upper flow channel plate 701, and the insertion protrusion 7021 passes through the decoupling film 8 located between the lower flow channel plate 702 and the upper flow channel plate 701 and is inserted into the slot 7011.

As shown in fig. 7 to 10, preferably, the insertion protrusion 7021 is disposed near the axis of the lower flow channel plate 702, and the insertion protrusions 7021 are disposed in a plurality of spaced positions along the circumferential direction of the lower flow channel plate 702, and in order to achieve a good fitting effect, the insertion protrusion 7021 is disposed to pass through a portion of the decoupling film 8 and be in a clearance with the decoupling film 8, and a portion of the insertion protrusion 7021 inserted into the insertion groove 7011 is in interference fit with the insertion groove 7011.

Through the cooperation of the insertion protrusions 7021 and the insertion grooves 7011, and the arrangement of the insertion protrusions 7021 close to the axis of the lower runner plate 702, when the decoupling membrane 8 is greatly influenced, the damping performance of the hydraulic mount can be prevented from being influenced by the deformation of the middle parts of the upper runner plate 701 and the lower runner plate 702.

As also shown in fig. 8, the above-described insertion protrusions 7021 are preferably provided in three circumferentially spaced-apart arrangement along the lower flow field plate 702 to achieve stable connection between the lower flow field plate 702 and the upper flow field plate 701. The decoupling film 8 is further provided with through holes 801 arranged corresponding to the insertion protrusions 7021, and the insertion protrusions 7021 penetrate through the through holes 801 through the portions of the decoupling film 8. And the insertion protrusion 7021 and the decoupling film 8 are arranged in a clearance mode and are in interference fit with the slot 7011, so that the integral structure is stepped.

In practical applications, the insertion protrusions 7021 can be set and adjusted accordingly, for example, four or five, according to actual connection requirements of the flow channel assembly 7.

As a preferable embodiment, as shown in fig. 2 and 3, the top of the damping mechanism in this embodiment is provided with a first protruding portion abutting against the housing 1, the first protruding portion includes a plurality of first protrusions 404 arranged at intervals in the circumferential direction of the connecting assembly 3, and at the same time, a plurality of reinforcing ribs 405 arranged at intervals in the circumferential direction of the connecting assembly 3 are preferably formed between the first damping portion 401 and the body of the damping mechanism.

The first bulge is arranged at the top of the buffer mechanism, so that the buffer mechanism can be firstly abutted against the shell 1 through the first bulge when contacting the shell 1, and abnormal sound between the first bulge and the shell is avoided. In addition to increasing the strength of connection between the first cushioning portion 401 and the body of the cushioning mechanism, the above-described reinforcing rib 405 and the first projection 404 may be provided at the same height (in the state shown in fig. 1) to have a useful effect of further reducing the possibility of occurrence of abnormal noise.

Of course, the number and arrangement of the ribs 405 and the first protrusions 404 may be adjusted according to the actual structure reinforcement requirement and the abutting requirement, for example, the ribs 405 and the first protrusions 404 may be arranged in a staggered manner.

The hydraulic suspension of this embodiment, through setting up buffer gear alone, but the adjustment buffer gear material alone, in order to improve buffer gear's wearability, simultaneously, set up first buffer 401, can avoid taking place rigid contact between rubber main spring 2 and the casing 1, and lead to rubber main spring 2 to take place the fracture condition, and through setting up second buffer 402, can also avoid coupling assembling 3 and casing 1 rigid contact and take place wearing and tearing, and then improve this hydraulic suspension's life and result of use.

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. A hydraulic mount characterized by:

the hydraulic suspension is provided with a rubber main spring (2) accommodated in a shell (1), the rubber main spring (2) is connected with a connecting component (3) with a part extending out of the shell (1), and a buffer mechanism is arranged on the connecting component (3);

the buffer mechanism is positioned between the rubber main spring (2) and the shell (1), and the bottom of the buffer mechanism is abutted against the rubber main spring (2); the damping mechanism is provided with a first damping part (401) located between the connecting component (3) and the shell (1), and a second damping part (402) located between the side part of the main rubber spring (2) and the shell (1).

2. The hydraulic mount of claim 1 wherein:

the buffer mechanism comprises a buffer block (4) sleeved on the connecting component (3);

the first buffer part (401) is formed by folding the inner side of the buffer block (4) towards one side of the shell (1), and the second buffer part (402) is formed by folding the outer side of the buffer block (4) towards one side of the rubber main spring (2).

3. The hydraulic mount of claim 2 wherein:

the first buffer part (401) is in interference fit with the connecting component (3); and/or the presence of a gas in the gas,

the buffer block (4) is embedded with a framework (403), and the framework (403) is provided with extending edges which respectively extend into the first buffer part (401) and the second buffer part (402).

4. The hydraulic mount of claim 1 wherein:

the shell (1) is provided with a lower shell (101) and an upper shell (102) which are connected in a buckling mode along the height direction of the shell, a main spring support (5) for supporting the rubber main spring (2) is arranged between the upper shell (102) and the lower shell (101) in a clamping mode, and flanges formed by outwards turning over are arranged at one ends, connected with the main spring support (5), the upper shell (102) and the lower shell (101), of the main spring support;

the flanges are attached to each other, and a bent edge (1021) which is bent towards the lower shell (101) and rivets the flanges together is formed on the flanges of the upper shell (102).

5. The hydraulic mount of claim 4 wherein:

the hydraulic suspension is further provided with a leather cup (6) which is accommodated in the lower shell (101) and matched with the rubber main spring (2) to form a liquid chamber (9), a flow channel assembly (7) is arranged between the leather cup (6) and the rubber main spring (2), and a second bulge (601) is arranged on one side, facing the flow channel assembly (7), of the leather cup (6).

6. The hydraulic mount of claim 5 wherein:

the second bulge portion (601) comprises a first bulge unit and a second bulge unit which are arranged along the radial direction of the leather cup (6) at intervals, the first bulge unit comprises a plurality of second bulges (6011) which are arranged along the circumferential direction of the leather cup (6) at intervals, and the second bulge unit comprises a plurality of third bulges (6012) which are arranged along the circumferential direction of the leather cup (6) at intervals.

7. The hydraulic mount of claim 6 wherein:

the second bulge (6011) is arc-shaped; and/or the second convex units are two which are arranged along the leather cup (6) at intervals in the radial direction.

8. The hydraulic mount of claim 5 wherein:

the flow channel assembly (7) comprises an upper flow channel plate (701) and a lower flow channel plate (702) which are arranged up and down, wherein an insertion protrusion (7021) is arranged on the lower flow channel plate (702), a slot (7011) is arranged on the upper flow channel plate (701), and the insertion protrusion (7021) penetrates through a decoupling film (8) between the lower flow channel plate (702) and the upper flow channel plate (701) and is inserted into the slot (7011).

9. The hydraulic mount of claim 8 wherein:

the insertion protrusion (7021) is arranged close to the axis of the lower runner plate (702); and/or the presence of a gas in the gas,

the insertion bulges (7021) are arranged at intervals along the circumferential direction of the lower runner plate (702); and/or the presence of a gas in the gas,

the part of the insertion protrusion (7021) penetrating through the decoupling film (8) and the decoupling film (8) are arranged in a clearance mode, and the part of the insertion protrusion (7021) inserted into the slot (7011) is in interference fit with the slot (7011).

10. The hydraulic mount of any one of claims 1 through 9 wherein:

the top of the buffer mechanism is provided with a first boss abutted against the shell (1), and the first boss comprises a plurality of first bulges (404) arranged at intervals along the circumferential direction of the connecting component (3); and/or the presence of a gas in the gas,

a plurality of reinforcing ribs (405) arranged at intervals along the circumferential direction of the connecting component (3) are formed between the first buffer part (401) and the body of the buffer mechanism.

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