JP3975062B2 - Bump stopper device for vehicle damper - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a damper main body coupled to a wheel support member, a piston sliding inside the damper main body, a piston rod coupled to the piston and extending above the damper main body, and an upper end portion of the piston rod. In particular, the first and second bump stoppers that collide with each other in the vicinity of the contraction limit of the damper on one side and the other side of the damper main body and the upper and lower sides of the mounting plate. It is related with improvement of the bump stopper device of a damper for vehicles which provided each.
[0002]
[Prior art]
Conventionally, as a bump stopper device for such a vehicle damper, a bellows-like elastic bump stopper whose thickness decreases downward is attached to the mounting plate, and when the damper approaches the shrinkage limit, the damper main body is It is known that an elastic bump stopper is subjected to compressive deformation from below by an end face to mitigate a thrusting impact on a vehicle body (see, for example, Japanese Patent Application Laid-Open No. 10-68439).
[0003]
[Problems to be solved by the invention]
In the above-mentioned conventional one, it is necessary to set the buffer stroke near the damper contraction limit relatively long, and it is difficult to apply to a damper of a vehicle having a low-down type suspension.
[0004]
The present invention has been made in view of such circumstances, and a bump stopper for a vehicular damper that can effectively mitigate a push-up impact on a vehicle body with a relatively short shock-absorbing stroke in the vicinity of the contraction limit of the damper without a sense of incongruity. An object is to provide an apparatus.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a damper main body coupled to a wheel support member, a piston sliding in the damper main body, a piston rod coupled to the piston and extending above the damper main body, and the piston A vehicular damper having a mounting plate that is provided at the upper end of the rod and is attached to the vehicle body collides with one another and the other surface of the damper body and the mounting plate facing each other in the vicinity of the damper contraction limit. A bump stopper device for a vehicle damper provided with a first bump stopper and a second bump stopper, respectively, wherein the first bump stopper is made of a relatively hard and deformable elastic material, and a hollow portion and an outer end surface of the hollow portion. A shell having an opening that is open to the core and a core made of a relatively soft elastic material and filled in the hollow and the opening, The second bump stopper, and raised from the contact surface and the contact surface facing the outer end surface of the first bump stopper facing the core of the opening, to form projections harder than the core, the first and when abutting the second bump stopper, the protrusion bites into the core, the shell is expanded by an increase in the amount of bite, then the first, characterized in that said abutment surface is to press the shell and core And
[0006]
According to the first feature, when the first and second bump stoppers are brought into contact with each other, the reaction force is relatively gradually increased at the beginning of the protrusion, and in the latter half of the engagement, the amount of the increase is increased. Accordingly , the reaction force is increased in a quadratic curve by expanding a relatively hard shell, and then the reaction force is continuously increased more rapidly by the contact surface pressing the shell and the core. Can do. Therefore, it is possible to effectively mitigate the impact of pushing up to the vehicle body with a relatively short shock-absorbing stroke and to improve riding comfort.
[0007]
In addition to the first feature, the second feature of the present invention is that the outer end surfaces of the core and the shell are flush with each other.
[0008]
The present invention, in addition to the first feature, the peripheral wall of the shell, the core is a third feature in that a anchor hole to be filled.
[0009]
According to the third feature, the anchor hole contributes to the strengthening of the bonding force between the shell and the core, and also serves to relieve the pressure of the core when the protrusion bites into the core, thereby increasing the flexibility of the core. .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below based on the embodiments of the present invention shown in the drawings.
[0011]
1 is a longitudinal sectional view of an automotive hydraulic damper according to a first embodiment of the present invention, FIG. 2 is an enlarged view of a main part of FIG. 1, FIG. 3 is an operation explanatory view corresponding to FIG. 2, and FIG. FIG. 5 is a cross-sectional view taken along line 4-4, FIG. 5 is a cross-sectional view corresponding to FIG. 2, showing a second embodiment of the present invention, and FIG. 6 is a buffer characteristic diagram of the bump stopper device of the present invention.
[0012]
First, a description will be given of the first embodiment of the present invention shown in FIGS. 1 and 2, a hydraulic damper D is interposed between a vehicle body B and a wheel support member A of the automobile. The damper body 1 of the hydraulic damper D includes an outer cylinder 2 whose lower end is closed, an inner cylinder 3 disposed in the outer cylinder 2, and a bottom wall of the outer cylinder 2 fixed to the lower end of the inner cylinder 3. A partition body 4 supported by the inner cylinder 3, a sliding bearing body 5 coupled to the upper end of the inner cylinder 3 and supported on the inner peripheral surface of the outer cylinder 2, and abutting against the upper end surface of the sliding bearing body 5 A plug body 6 that is oil-tightly fitted to the inner peripheral surface of the upper end portion of the outer cylinder 2 and a cap 7 that is fitted to the outer periphery of the upper end portion of the outer cylinder 2 and covers the plug body 6. The bearing body 5 cooperates to hold both cylinders 2 and 3 concentrically with each other.
[0013]
The inner cylinder 3 is slidably fitted with a piston 12 that divides the inner cylinder 3 into an upper oil chamber 10 and a lower oil chamber 11, and a piston rod 13 coupled to the center of the piston 12 is a sliding bearing body 5. The plug body 6 and the cap 7 are extended upward while being slidably supported by each other. When the piston 12 moves up and down in the inner cylinder 3, it resists the oil passage 14 that allows the hydraulic oil to flow between the upper and lower oil chambers 10 and 11, and the hydraulic oil that passes through the oil passage 14. A known main buffer valve 15 is provided for generating a damping force. Further, the partition wall 4 is also resistant to the oil passage 17 that allows the hydraulic oil to flow between the lower oil chamber 11 and the outer chamber 16 between the cylinders 2 and 3, and the hydraulic oil that passes through the oil passage 17. And a known auxiliary buffer valve 18 for generating a damping force.
[0014]
An upper end portion of the piston rod 13 protruding outside the damper main body 1 is narrowed by one step, and a mounting plate 21 is attached to that portion via an elastic mount member 20, and the mounting plate 21 and the outer periphery of the outer cylinder 2 are welded to each other. A coil-like suspension spring 23 that biases the hydraulic damper D in the extending direction is contracted between the flange plate 22 and the flange plate 22 that has been formed. The mounting plate 21 is bolted to the vehicle body B, and the lower end portion of the outer cylinder 2 is connected to a wheel support member A that is pivotally supported by the vehicle body B so as to swing up and down.
[0015]
A bump stopper device 25 according to the present invention is provided between the mounting plate 21 and the damper main body 1 to buffer the shrinkage limit of the hydraulic damper D, and is welded to the upper end of the damper main body 1, that is, the upper end of the cap 7. The first bump stopper 26 is attached to the support plate 28 and the second bump stopper 27 is attached to the attachment plate 21.
[0016]
The first bump stopper 26 is composed of a hollow donut-shaped shell 29 made of a relatively hard and deformable elastic material, and a relatively soft elastic material. The first bump stopper 26 is filled in the annular hollow portion 30 of the shell 29 and coupled to the shell 29. The core 31 is configured. The hollow portion 30 has an annular opening 30a (see FIG. 4) that opens on the upper surface of the shell 29, and the core 31 is filled up to the opening 30a and is flush with the upper surface of the shell 29. ing. The shell 29 is placed on the support plate 28, and is attached to the support plate 28 by fitting an annular locking portion 29 a at the periphery of the lower end portion of the shell 29 into the outer periphery of the support plate 28.
[0017]
On the other hand, the second bump stopper 27 includes a substrate 32 connected to the mounting plate 21 via the elastic mount member 20 and an elastic material harder than the core 31 and is joined to the lower surface of the substrate 32. It consists of. The lower surface of the buffer 33 is a contact surface 34 facing the upper end surface of the first bump stopper 26, and the contact surface 34 has an annular or annular arrangement facing the core 31 of the opening 30 a. A projection 35 is formed, and this projection 35 abuts on the core 31 and bites in the vicinity of the contraction limit of the hydraulic damper D.
[0018]
In addition, a thin-walled boot 36 that covers the outer periphery of the upper half of the first bump stopper 26 and the outer cylinder 2 is integrally connected to the outer periphery of the lower end of the buffer 33 so as to prevent dust and water. The lower end of the boot 36 is formed on a flange 36 a and is sandwiched between the flange plate 22 and the suspension spring 23. An elastic bellows 36b is formed in the middle of the boot 36 so that the boot 36 can expand and contract in accordance with the expansion and contraction of the hydraulic damper D.
[0019]
Next, the operation of the first embodiment will be described.
[0020]
When the vehicle is traveling on a rough road, if the wheel support member A swings up and down with respect to the vehicle body B along with the vertical vibration of the wheel (not shown), the suspension spring 23 and the hydraulic damper D are given expansion and contraction, and the piston 12 is moved into the inner cylinder. Go up and down in 3. At that time, between the upper and lower oil chambers 10 and 11 in the inner cylinder 3, the oil passage 14 and the main buffer valve 15 of the piston 12 are passed , and between the lower oil chamber 11 and the outer chamber 16, the oil passage 17 and A damping force is generated by the hydraulic oil flowing through the auxiliary buffer valve 18 to buffer the vertical vibration of the wheel.
[0021]
However, when the repulsive force of the suspension spring 23 and an excessive push-up force exceeding the damping force act on the wheel and the hydraulic damper D approaches the contraction limit, first, the projection 35 of the second bump stopper 27 is moved to the first bump 35. The bump stopper 26 abuts on the upper surface of the core 31. Since the protrusion 35 is harder than the core 31, the protrusion 35 bites into the core 31 relatively easily, and the shell 29 that is harder than the core 31 expands as the biting amount increases (see FIG. 3). As a result, the reaction force generated according to the biting of the protrusion 35 into the core 31 initially rises relatively slowly as shown by the line ab in FIG. 6, and rapidly increases in a quadratic curve in the second half. Will do.
[0022]
When the protrusion 35 completely bites into the core 31, the contact surface 34 of the second bump stopper 27 abuts against the upper end surface of the first bump stopper 26, and the entire bump stoppers 26 and 27 are compressed, and the reaction force 6 further increases as shown by the line bc in FIG. 6, but since the latter half of the line ab rises like a quadratic curve, the steep line bc continues smoothly to the line ab. Will do. Therefore, since the thrust shock to the vehicle body B can be effectively mitigated without a sense of incongruity with a very short buffer stroke in the vicinity of the contraction limit of the hydraulic damper D, the ride comfort can be improved. In particular, the stroke of the hydraulic damper D This is effective when applied to a vehicle having a low-down type suspension in which it is difficult to sufficiently secure the vehicle.
[0023]
Also, a plurality of first bump stoppers 26 having different elastic moduli of the core 31 and the shell 29 are prepared, and a plurality of second bump stoppers 27 having different shapes of the protrusions 35 are prepared, and these are selectively combined. Then, the bump stopper device 25 having various characteristics can be obtained.
[0024]
Next, a second embodiment of the present invention shown in FIG. 5 will be described.
[0025]
In the second embodiment, the arrangement of the first bump stopper 26 and the second bump stopper 27 is opposite to that in the first embodiment. In other words, a shell 29 filled with the core 31 is formed on the buffer 33 coupled to the substrate 32 and contacts the second bump stopper 27 attached to the support plate 28 integral with the cap 7 via the annular locking portion 27a. A contact surface 34 and a protrusion 35 are formed.
[0026]
In the first bump stopper 26 of the second embodiment, a plurality of anchor holes 40 reaching the hollow portion 30 are provided on the peripheral wall of the shell 29, and the core 31 is filled and coupled to these anchor holes 40. The anchor hole 40 contributes to strengthening the bonding force between the shell 29 and the core 31 and also serves to relieve the pressure of the core 31 when the protrusion 35 bites into the core 31, thereby increasing the flexibility of the core 31. Further, when the core 31 is molded, the material of the core 31 can be injected or vented using the anchor hole 40.
[0027]
Since the other configuration is the same as that of the first embodiment, the same reference numerals are assigned to the portions corresponding to those of the first embodiment in FIG. Also, since the function and effect are basically the same as those of the first embodiment, the description thereof is also omitted.
[0028]
The present invention is not limited to the above embodiments, and various design changes can be made without departing from the scope of the invention. For example, the anchor hole 40 of the second embodiment can be provided in the first bump stopper 26 of the first embodiment.
[0029]
【The invention's effect】
As described above, according to the first and second features of the present invention, the damper main body coupled to the wheel support member, the piston sliding inside the damper main body, coupled to the piston and extending above the damper main body. A damper for a vehicle having a piston rod and a mounting plate provided at the upper end of the piston rod and attached to the vehicle body, near the damper contraction limit on one side and the other side of the damper body and the mounting plate opposite to each other. And a bump stopper device for a vehicle damper provided with first and second bump stoppers that abut each other, the first bump stopper being made of a relatively hard and deformable elastic material, A shell having an opening for opening the hollow portion to the outer end surface and a core made of a relatively soft elastic material and filled in the hollow portion and the opening. To other hand, the second bump stopper, and raised from the contact surface and the contact surface facing the outer end surface of the first bump stopper facing the core of the opening, the projections harder than the core (31) forming a, when abutting the first and second bump stopper, the protrusion bites into the core, the shell is expanded by an increase in the amount of bite, then, as the abutment surface presses the shell and core since the, impact push-up of the vehicle body without discomfort effectively mitigated with a relatively short buffer stroke, it is possible to improved ride quality.
[0030]
According to the third feature of the present invention, in addition to the first feature, the anchor hole for filling the core is provided in the peripheral wall of the shell, so that the anchor hole is used for the coupling force between the shell and the core. In addition to contributing to strengthening, when the protrusions bite into the core, it can also be used to relieve the core pressure and increase the flexibility of the core.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of an automotive hydraulic damper according to a first embodiment of the present invention.
FIG. 2 is an enlarged view of a main part of FIG.
FIG. 3 is an operation explanatory diagram corresponding to FIG. 2;
4 is a cross-sectional view taken along line 4-4 of FIG.
FIG. 5 is a sectional view corresponding to FIG. 2, showing a second embodiment of the present invention.
FIG. 6 is a buffer characteristic diagram of the bump stopper device of the present invention.
[Explanation of symbols]
A ... Wheel support member B ... Body D ... Damper (hydraulic damper)
1 ... Damper body 12 ... Piston 13 ... Piston rod 21 ... Mounting plate 25 ... Bump stopper device 26 ... First bump stopper 27 ... Second bump stopper 29 ... · Shell 30 · · · hollow portion 30a · · · opening 31 · · · core 34 · · · contact surface 35 · · · projection 40 · · · anchor hole

Claims (3)

A damper main body (1) coupled to the wheel support member (A), a piston (12) sliding in the damper main body (1), and coupled to the piston (12) and extending above the damper main body (1). piston rod (13), and provided at the upper end the body of the mounting plate attached to (B) for a vehicle comprising a (21) the damper (D), the damper body (1) and the mounting plate of the piston rod (13) (21) Bumps for a vehicle damper, in which first and second bump stoppers (26, 27) that abut each other in the vicinity of the contraction limit of the damper (D) are provided on one and the other surfaces facing each other vertically A stopper device ,
The first bump stopper (26) is made of a relatively hard and deformable elastic material and has a hollow portion (30) and a shell (30a) having an opening (30a) that opens the hollow portion (30) to the outer end surface. 29) and a core (31) made of a relatively soft elastic material and filled in the hollow portion (30) and the opening (30a), while the second bump stopper (27) A contact surface (34) facing the outer end surface of the first bump stopper (26), and being harder than the core (31), which protrudes from the contact surface and faces the core (31) of the opening (30a). When the first and second bump stoppers (26, 27) are brought into contact with each other, the protrusion (35) bites into the core (31), and the shell (29) is increased by the amount of biting. There inflated, then the abutment surface (34 There shell (29) and core (31), characterized in that so as to press the bump stopper device for a vehicle damper. The bump stopper device for a vehicle damper according to claim 1,
A bump stopper device for a vehicle damper, wherein the outer end surfaces of the core (31) and the shell (29) are flush with each other. The bump stopper device for a vehicle damper according to claim 1,
A bump stopper device for a vehicular damper, wherein an anchor hole (40) filled with the core (31) is provided in a peripheral wall of the shell (29).

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