JP3656080B2 - Bound stopper for vehicle - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle bound stopper, in particular, an arm (control arm, lower arm, etc.), a leaf spring, or the like that supports a wheel in a suspension of an automobile, moves up and down more than a limit due to the bound of the wheel, or a frame that faces these. The present invention relates to a bound stopper for preventing direct contact with a vehicle body side member.
[0002]
[Prior art]
In order to prevent the lower arms and leaf springs from moving up and down (swinging) more than the limit and abutting against the vehicle body side members such as frames when the wheels bounce, A bound stopper (including a hollow spring used in combination with a metal spring) made of an elastic body such as rubber is provided on a part of the vehicle body side member facing the member.
[0003]
As shown in FIG. 5, for example, the bound stopper (A1) is attached to a stopper main body (11) made of a cylindrical (columnar) elastic body having a slightly tapered shape as a whole, and a large diameter side end. The attached mounting bracket (13) is attached and fixed to the vehicle body side member (18) via the mounting bracket (13), and the member (19) that moves up and down, such as an arm, in the event of a large bounce, It is configured to hit this. Many stopper bodies (11) have a pleated wall shape in which one or more ring-shaped grooves (15) are formed on at least the outer periphery. This stopper may be used in combination with a coil spring (20) as shown in FIG.
[0004]
By the way, a member abutting on the bound stopper (A1), for example, a member (19) such as an arm for supporting a wheel, is supported by being attached to the vehicle body side member (18) so as to be swingable. .
[0005]
That is, the member (19) such as the arm moves up and down (oscillates) with a substantially constant trajectory with the mounting portion (17) as a fulcrum, so that the stopper body (11 of the bound stopper (A1)) ) In an inclined state. When the member (19) such as an arm abuts against the stopper main body (11), it always hits the same position while being inclined in a substantially constant angle and direction, and the stopper main body ( 11) Deflection.
[0006]
[Problems to be solved by the invention]
However, since the stopper main body (11) has a cylindrical shape as described above and does not have directionality, the stopper body (11) is subjected to strain (strain caused by elastic deformation) upon contact with the member (19). Concentrate on the part of the close side. In particular, as shown in the figure, in the case of a form having a constricted portion by a ring-shaped groove (15) on the outer periphery of the stopper body, the constricted portion tends to concentrate strain and stress at the time of contact, and as a result, breakage occurs in this portion. Will occur.
[0007]
In order to member moves up and down (19) makes contact in a state tilted with respect to the stopper body (11), stopper body (11) is deformation, easily collapse occurs, impairing durability It is the result.
[0008]
The present invention has been made in view of the above, and as this type of vehicle bound stopper, the thickness of the portion where the strain (deformation) at the time of contact is concentrated is changed on the circumference so as to be excessive at the time of contact. It has a sufficient elastic force to prevent the deformation of the material, and aims to improve the durability by improving the deformation state.
[0009]
[Means for Solving the Problems]
A vehicle bound stopper according to the present invention that solves the above-described problems is a bound stopper that is attached to either a member that moves up and down such as an arm of a suspension or the like and a vehicle body side member that faces the member. body by it to form a cylindrical stopper body, has an outer peripheral ring-shaped groove of the stopper body, the thickness at the circumference of the ring-shaped groove by constricted portions abutting upon distortion is a member which concentrates The portion on the contact side with the opposing member as viewed from the axial center is gradually changed on the circumference so as to be thick .
[0010]
In the present invention, the circumferential thickness of the constricted portion formed by the ring-shaped groove is maximized at the circumferential central portion of the range in a phase range of 90 to 120 ° that is in contact with the axial center. It is characterized by being gradually changed.
[0011]
[Action]
According to the vehicle bound stopper of the present invention described above, the thickness of the constricted portion due to the ring-shaped groove in which the strain at the time of contact of the stopper main body is concentrated is thick at the portion on the contact side with the member facing the shaft center. Therefore, this part has a large elastic force, so that excessive deformation (distortion) can be suppressed even when a contact such as an arm is tilted against the stopper body when it comes into contact with a bounce. The strain does not concentrate, and the thickness is gradually changed on the circumference, so that stress concentration hardly occurs. Moreover, since the thickness is increased on the contact side with the opposing member, the stopper can be prevented from falling.
[0012]
In particular, when a ring-shaped groove on the outer periphery of the stopper body, but the contact time of the distortion at the portion constricted by the ring-shaped groove is larger, viewed from the axial center as in this onset Ming contact side of 90 to 120 ° If the phase range is gradually increased in thickness and the maximum thickness is formed at the center in the circumferential direction of the range, the amount of rubber of the stopper main body is not excessively increased, but by the contact of the opposing member It is possible to efficiently prevent deformation (strain) and stress concentration caused thereby.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Next, embodiments of the present invention will be described with reference to the drawings.
[0014]
1-3, (A) shows the bound stopper for vehicles which concerns on this invention, (1) is the stopper main body which consists of elastic bodies, such as rubber | gum, and as shown in the figure as a whole from one end side to the other end side It has a tapered shape with a slightly smaller diameter, and is formed in a cylindrical shape having a shaft hole (2) inside. A metal mounting bracket (3), which also serves as a reinforcement, is firmly bonded and integrated simultaneously with the vulcanization molding of the stopper body (1) at the large diameter side end of the stopper body (1). . The bound stopper (A) is attached and fixed to a part of the vehicle body side member (8) such as a frame through the attachment fitting (3).
[0015]
The stopper body (2) has a ring-shaped groove (4) (5) continuous in the circumferential direction with one or axial spacing on the inner and outer circumferences of the stopper body (2). It is formed in a pleated wall shape as a whole. Usually, it is formed so as to have a minimum diameter at the constricted portion by the ring-shaped groove (5) on the outer periphery, and is formed so that the thickness of the constricted portion is minimized. Therefore, the strain at the time of contact tends to concentrate at the constricted portion.
[0016]
In the stopper main body (1), as shown in FIGS. 1 and 2, the thickness of the constricted portion of the outer peripheral ring-shaped groove (5) is such that the ring-shaped groove (5 ), Particularly the thickness of the arm on the swing fulcrum side is attached to the contact side portion, for example, the vehicle body side member (8). The part on the side where the member (9) contacts with an inclination angle is gradually changed on the circumference so as to be thick.
[0017]
That is, as shown in FIG. 2, assuming that the normal thickness of the constricted portion by the ring-shaped groove (5) is (t1), in the phase range of 90 to 120 ° on the contact side as seen from the axis, The thickness is gradually changed so as to be the maximum thickness (t2) at the circumferential center. (6) shows the thick part.
[0018]
If the range of the thick part (6) is larger than the phase range, the amount of rubber of the elastic material becomes excessive, which tends to cause strain and stress concentration, resulting in a decrease in durability. If it becomes smaller, the expected effect of preventing stress concentration cannot be obtained.
[0019]
In the above embodiment, it is assumed that changing the thickness at the portion constricted by the outer periphery of the ring shaped groove (5) at a peripheral on, the thickness of the part amount having an inner circumference of the ring shaped groove (4), the same It can also be changed on the road.
[0020]
As illustrated in FIG. 3, the bound stopper (A) having the above-described configuration uses, for example, the shaft hole (2) at the center thereof by the mounting bracket (3) attached to the large-diameter end, The suspension is used by being attached to a vehicle body side member (8) such as a frame facing an arm (control arm, lower arm or the like) supporting a wheel or a member (9) which moves up and down (oscillates) when bound such as a leaf spring.
[0021]
(3a) in FIG. 1 is a positioning protrusion when the bound stopper (A) is attached to the vehicle body side member (8), and this protrusion (3a) engages with the recess of the vehicle body side member (8). By doing so, the thick part of the bound stopper (A) is arranged on the swing fulcrum side of the member (9) such as an arm in front of the vehicle. (W) indicates the wheel, and (W1) indicates the axle center.
[0022]
When the vehicle (T) bounces greatly while the automobile is running and the member (9) such as an arm moves up and down relative to the vehicle body side member (8), the member (9) hits the bound stopper (A). Touch.
[0023]
At this time, the vertical movement of the member (9) such as the arm is a swinging movement that always draws a substantially constant trajectory with the mounting portion (7) as a fulcrum, and therefore when it comes into contact with the bound stopper (A). Although it always starts to hit in a state inclined in a substantially constant angle and direction (usually provided so that the inclination angle becomes 0 ° when the stopper is most bent), the stopper body (1) of the bound stopper (A) ) Is such that the thickness of the constricted portion by the ring-shaped groove (5) is gradually changed on the circumference, and the thickness is increased on the side where the member (9) abuts. Excessive deformation (strain) at the time of contact can be suppressed, and this, combined with the fact that the thickness is gradually changed on the circumference, can prevent stress concentration due to strain at the time of contact, and consequently breakage from this part Can be prevented. (Α) indicates an inclination angle.
[0024]
Moreover, since the natural elastic force of this part increases by increasing the thickness of the contact side as described above, it is possible to prevent a fall due to deformation in the arrow direction when the member (9) is contacted.
[0025]
Although not shown in the drawings, the bound stopper (A) of the present invention is a member (9) that moves up and down (swings) when bouncing an arm (control arm, lower arm, etc.) or a leaf spring that supports wheels in the suspension. It is also possible to install it on the side of). Moreover, it can also be used as a hollow spring combined with a coil spring as shown in FIG.
[0026]
In order to confirm the effect of the present invention, a durability test was compared between the bound stopper of the present invention (Example) and the bound stoppers of the conventional shape (Comparative Examples 1 and 2).
[0027]
The bound stoppers of the examples and comparative examples 1 and 2 all have the basic shape of the shape shown in FIG. 1, and the size is an axial length of 100 mm, a maximum diameter of 80 mm, and an axial hole diameter of 22 mm.
[0028]
As for the thickness on the circumference of the constricted portion by the ring-shaped groove (5) having the minimum diameter on the outer periphery, in the embodiment, the minimum thickness (t1) is 9 mm, and the maximum thickness in the phase range of 120 ° on the side where the member abuts. (T2) is 12 mm, Comparative Example 1 is constant at the minimum thickness (t1), Comparative Example 2 is constant at the maximum thickness (t2), and load is applied at a constant inclination angle (α) as shown in FIG. (P) was loaded and tested.
[0029]
As a result of this durability test, in the case of the example of the present invention, the durability was doubled as compared with Comparative Example 1 corresponding to the conventional product or Comparative Example 2 in which the thickness was increased on the entire circumference.
[0030]
【The invention's effect】
As described above, the present invention is a thickness of a portion where distortion at the time of contact is most likely to be concentrated as a bounce stopper attached to one of a member that can move up and down such as an arm of a suspension and a vehicle body side member facing the member. By gradually changing the area around the circumference, especially by increasing the thickness of the part on the contact side, the increase in elastic material can be minimized and concentration of deformation (strain) at the time of contact can be prevented. The deformation state at the time of contact with the contact surface can be improved, damage and collapse can be effectively prevented, and the durability can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a bound stopper according to an example of the present invention.
FIG. 2 is a sectional view taken along line XX of FIG.
FIG. 3 is a schematic cross-sectional view of a part of the bound stopper according to the present invention in use.
FIG. 4 is a cross-sectional explanatory diagram at the time of stopper contact.
FIG. 5 is a cross-sectional explanatory view of a conventional bound stopper.
[Explanation of symbols]
(A) Bound stopper (1) Stopper body (2) Mounting bracket (3) Shaft hole (4) Inner ring ring groove (5) Outer ring ring groove (6) Thick part (8) Car body side member ( 9) Vertically movable member

Claims (1)

This is a bound stopper that is attached to one of a member that can move up and down, such as a suspension arm, and a vehicle body side member that opposes the member. The stopper body is formed of an elastic body and has a cylindrical shape. A ring-shaped groove on the outer periphery of the ring , and the thickness on the periphery of the constricted portion by the ring-shaped groove, which is a part where strain is concentrated at the time of contact, is the contact side with the opposing member as viewed from the axis. A bound stopper for a vehicle, characterized in that a portion in a phase range of ˜120 ° is thick, and is gradually changed so as to have a maximum thickness at a central portion in the circumferential direction of the range .

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