JP4016323B2 - Cylindrical mount - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a cylindrical mount that is suitably employed, for example, as a differential mount, body mount, member mount or the like of an automobile.
[0002]
[Prior art]
Conventionally, for example, when a differential mounted on an automobile is attached to a vehicle body, a cylindrical mount such as a diff mount is used to support the differential on the vehicle body in a vibration-proof manner. As such a cylindrical mount, as shown in FIG. 4, a main shaft member 71 formed in a pipe shape and an outer flange portion 72 a at one end thereof are arranged coaxially at a distance outside the main shaft member 71. An outer cylinder member 72, a rubber elastic body 73 that is interposed between the main shaft member 71 and the outer cylinder member 72 and integrally connects the two, and a rubber stopper 74 provided on an outer flange portion 72a of the outer cylinder member 72. The one with is known.
[0003]
The cylindrical mount includes an attachment bolt 61 inserted into the inner hole of the main shaft member 71 while the outer cylinder member 72 is press-fitted and fixed into the mounting hole 51a of the bracket 51 provided on either the differential or the vehicle body. The main shaft member 71 is attached to the attachment portion 60 provided on the other side by tightening and fixing together with the attachment substrate 60a, and the axial direction thereof is arranged to be the load input direction (main vibration input direction).
[0004]
When an axial vibration (load) is input to the cylindrical mount, the vibration, that is, the relative displacement in the axial direction of the main shaft member 71 and the outer cylindrical member 72 is absorbed by the rubber elastic body 73 being sheared. Is done. When a large vibration is input in the axial direction, the rubber stopper 74 provided on the outer flange portion 72a arranged to face the attachment substrate 60a or the rubber provided to the attachment portion 60 arranged to face the bottom portion of the bracket 51. The excessive displacement in the axial direction is elastically restricted by the stopper 66, thereby improving the durability of the rubber elastic body 73.
[0005]
The spring characteristics as seen from the relationship between the load and the deflection of this cylindrical mount are as shown in FIG. That is, until the rubber stoppers 66 and 74 regulate the displacement, only the rubber elastic body 73 functions to form a linear low spring constant region, and after the rubber stoppers 66 and 74 start regulating the displacement, It becomes a linear high spring constant region where the rise is sharper than the spring constant region.
[0006]
As another cylindrical mount, as shown in FIG. 6, a main shaft member 81 formed in a pipe shape and an outer flange portion 82 a at one end thereof are coaxially spaced apart from the main shaft member 81. A disposed outer cylinder member 82, a rubber elastic body 83 that is interposed between the main shaft member 81 and the outer cylinder member 82 and integrally connects the two, and a rubber stopper provided on an outer flange portion 82a of the outer cylinder member 82 84 and a rubber support 85 are known.
[0007]
This cylindrical mount has the same basic structure as the cylindrical mount shown in FIG. 4, and is fixed and attached to the mounting hole 55a of the differential carrier 55 and the mounting portion 60 on the vehicle body side in the same manner as described above. However, the difference is that a rubber support portion 85 is provided on the outer flange portion 82a so that the tip thereof is in pressure contact with the mounting substrate 60a. In addition, a rubber support portion 67 whose tip is in pressure contact with the differential carrier 55 is provided separately from the rubber stopper 66 on the mounting portion 60 that is disposed opposite to the differential carrier 55 in the axial direction. By providing such a rubber support portion 67, the spring constant in the axial direction can be set higher from the initial stage. The rubber elastic body 83 of the cylindrical mount is provided with a shaft 83a penetrating in the axial direction in order to adjust the spring constant in the longitudinal direction and the lateral direction of the automobile.
[0008]
[Problems to be solved by the invention]
By the way, in recent years, an increase in engine torque tends to be promoted with an increase in performance of automobiles. Therefore, in a cylindrical mount such as the above-described differential mount, the low spring constant region before the excessive displacement starts to be restricted by the rubber stoppers 74 and 84 is expanded, that is, even if a certain high load is input. There is a strict demand to ensure a sufficiently low spring constant region in the linear region. However, in many cases, the conventional structure does not hold due to space or the like.
[0009]
In the case of the cylindrical mount shown in FIG. 4, when the low spring constant region is increased, the outer diameter of the rubber elastic body 73 is increased to ensure durability, and the free length (axial length) of the rubber elastic body 73 is increased. Need to be increased. Then, when the radial length necessary for establishing the durability is secured, the axial spring is greatly reduced. Therefore, in order to increase (return) to the necessary spring constant, the rubber elastic body 73 It is necessary to compensate by increasing the axial volume (rubber space). However, the expansion in the axial direction (vertical direction in an automobile) often makes it difficult to secure a space due to the limitation of the vehicle ground clearance.
[0010]
On the other hand, in the case of the cylindrical mount shown in FIG. 6, when the required amount of displacement (required load) in the low spring constant region is presented as a target, the axial length of the rubber support portion 85 is required to establish durability. It is necessary to increase the height according to the required displacement amount, and an axial space is also required accordingly. In particular, in the structure of this cylindrical mount, it is necessary to compensate for a decrease in the spring constant due to an increase in the axial length of the rubber support portion 85 by expanding the area of the rubber support portion 85 in the outer flange portion 82a. Therefore, it is necessary to cope by enlarging the outer flange portion 82a in the radial direction or by reducing the area of the rubber stopper 84 for restricting excessive displacement in the axial direction. However, when the outer flange portion 82a is enlarged in the radial direction, it is disadvantageous in terms of space, and when the area of the rubber stopper 84 for excessive displacement regulation in the axial direction is reduced, durability at high loads is achieved. Disadvantageous.
[0011]
The present invention has been made in view of the above circumstances, and while ensuring the required durability, it is possible to expand the range of the low spring constant region in the linear region while avoiding an increase in size in the axial direction. Providing a cylindrical mount is a problem to be solved.
[0012]
[Means for solving the problems, actions and effects of the invention]
The invention according to claim 1, which solves the above-described problem, includes a main shaft member, an outer cylindrical member disposed coaxially at a distance outside the main shaft member, and interposed between the main shaft member and the outer cylindrical member. In the cylindrical mount that is mounted so that a load is input in the axial direction, the rubber elastic body includes a rubber main body unit that integrally connects the main shaft member and the outer cylinder member, It is formed separately from the rubber main body so as not to be affected by the movement of the rubber main body that shears and deforms in the axial direction due to the axially penetrating and fixed to the inner peripheral surface of the outer cylinder member. In addition, a means is provided that includes an auxiliary support portion having a protruding portion that protrudes outward in the axial direction from both ends of the outer cylinder member from the radially inner portion of the both end surfaces in the axial direction.
[0013]
In the cylindrical mount of the present invention, when vibration (load) is input in the axial direction, the vibration, that is, the relative displacement in the axial direction between the main shaft member and the outer cylinder member causes shear deformation of the rubber main body of the rubber elastic body. In addition, the auxiliary support part is absorbed by compressive deformation. In this case, by providing the auxiliary support portion that compresses and deforms, it is possible to ensure the required durability and to set the axial spring constant higher from the initial stage. Thereby, it is possible to expand the range of the low spring constant region in the linear region before the rubber stopper or the like provided for regulating excessive displacement between the main shaft member and the outer cylinder member functions.
[0014]
Since the auxiliary support portion is fixed to the inner peripheral surface of the outer cylinder member and is provided between the outer cylinder member and the main shaft member, an increase in size in the axial direction is avoided and the axial length of the auxiliary support portion is reduced. It is possible to set the length sufficiently long as necessary. Further, since the auxiliary support portion is formed separately from the rubber main body portion by the piercing provided in the axial direction, the auxiliary support portion is not affected by the movement of the rubber main body portion that undergoes shear deformation in the axial direction. Can maintain a stable spring characteristic.
[0015]
Therefore, according to the cylindrical mount of the present invention, the required durability can be ensured and the range of the low spring constant region in the linear region can be expanded while avoiding the increase in size in the axial direction.
[0016]
According to a second aspect of the present invention, in the first aspect of the invention, the auxiliary support portion may be configured such that the protruding portion is attached to an attachment counterpart member to which the main shaft member is fixed and an attachment counterpart member to which the outer cylinder member is fixed. The means of being constructed so that the tips of each can be attached in a state where they are in pressure contact with each other is employed.
[0017]
According to this means, when the cylindrical mount is mounted between the mounting mating members to be vibration-proof connected, the auxiliary support portion has the axially projecting tips at the ends of the shafts in pressure contact with the mounting mating members, respectively. It becomes a state compressed by a predetermined amount in the direction. Thereby, the auxiliary support part can stably exhibit a certain spring rigidity from the initial stage of vibration input, and can easily obtain the target spring characteristic.
[0018]
According to a third aspect of the present invention, in the first or second aspect of the present invention, the auxiliary support portion employs means in which a plurality of auxiliary support portions are provided at equal intervals in the circumferential direction of the rubber elastic body. .
[0019]
According to this means, it is possible to arrange the auxiliary support portions that support the input load in the axial direction at both ends in the axial direction with a good balance in the circumferential direction. Two or more auxiliary support portions can be provided, but it is preferable to provide the auxiliary support portion so as to be symmetrical with respect to the main shaft member in consideration of the balance between the front-rear direction and the left-right direction of the automobile. Further, the shape of the edge formed so as to separate the auxiliary support portion and the rubber main body portion can be appropriately determined according to the shape and number of auxiliary support portions.
[0020]
According to a fourth aspect of the present invention, in the first to third aspects of the present invention, an elastic stopper that restricts a large axial displacement between the outer cylinder member and the main shaft member is provided at an end of the outer cylinder member. It adopts the means of being.
[0021]
According to this means, since the large displacement in the axial direction between the outer cylinder member and the main shaft member is restricted by the elastic stopper, excessive deformation of the rubber elastic body is prevented, so that the durability can be improved. it can.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0023]
1 is a cross-sectional view taken along the axial direction of the cylindrical mount according to the present embodiment, and is a cross-sectional view taken along the line II of FIG. 2. FIG. 2 is a bottom view of the cylindrical mount viewed from the axial direction. FIG.
[0024]
As shown in FIG. 1, the cylindrical mount of the present embodiment includes a main shaft member 1, an outer cylinder member 2 that is coaxially arranged at a distance from the outer side of the main shaft member 1, and the main shaft member 1 and the outer cylinder member. And a rubber elastic body 3 having a pair of rubber main body portions 32 and 32 and a pair of auxiliary support portions 33 and 33 which are formed by being separated by the curls 31 and 31.
[0025]
The main shaft member 1 is formed in a pipe shape having a constant inner diameter and outer diameter from a metal such as steel.
[0026]
The outer cylindrical member 2 includes a cylindrical main body portion 21, a ring-shaped outer flange portion 22 extending radially outward from one end of the cylindrical main body portion 21, and a radially inner portion from the other end of the cylindrical main body portion 21. The ring-shaped curved portion 23 is slightly curved in the direction, and is integrally formed of a thin metal plate such as steel. The outer cylinder member 2 has an inner diameter that is larger by a predetermined dimension than the outer diameter of the main shaft member 1, is formed to be approximately half the length of the main shaft member 1, and is coaxial with a distance from the outer side of the main shaft member 1. Is arranged.
[0027]
The rubber elastic body 3 is formed in a substantially cylindrical shape by integrally vulcanizing a rubber material together with the main shaft member 1 and the outer cylinder member 2, and is interposed between the main shaft member 1 and the outer cylinder member 2. On both sides of the main shaft member 1 of the rubber elastic body 3, a pair of straights 31, 31 penetrating in the axial direction are provided so as to be axially symmetric. The slips 31, 31 are formed so as to extend in a plane and are parallel to each other, and both longitudinal ends in the direction perpendicular to the axis reach the vicinity of the inner peripheral surface of the outer cylinder member 2. As a result, the rubber elastic body 3 includes a pair of rubber main body portions 32 and 32 that are located on both sides of the main shaft member 1 between the pair of straightenings 31 and 31 and have a circular arc shape in cross section, and the pair of straightenings 31 and 31. It is separated into a pair of auxiliary support portions 33, 33 that are located outside and have a bow-shaped cross section.
[0028]
The rubber body portions 32, 32 are vulcanized and bonded to the outer peripheral surface of the main shaft member 1 and the outer peripheral surface thereof to the inner peripheral surface of the outer cylinder member 2. is doing. On the other hand, the auxiliary support portions 33 and 33 are only vulcanized and bonded to the inner peripheral surface of the outer cylinder member 2 at the outer peripheral surface. At the outer peripheral end portions of both end surfaces of the auxiliary support portions 33, 33, recessed portions recessed inward in the axial direction extending in an arc shape along the outer cylinder member 2 are provided. And the protrusion part 33a, 33a in which the cross section which protrudes to an axial direction outward from a recessed part is each formed in the radial inside rather than the recessed part of the both end surfaces of the auxiliary | assistant support parts 33, 33 is provided. The protrusions 33 a and 33 a protrude outward in the axial direction from both end surfaces of the outer cylinder member 2. Since the auxiliary support portions 33 and 33 having such protrusions 33a and 33a are provided between the main shaft member 1 and the outer cylinder member 2, a sufficiently long axial length is secured.
[0029]
A rubber coating layer 35 that covers the outer end surface of the outer flange portion 22 of the outer cylinder member 2 is integrally connected to the rubber elastic body 3. Then, the predetermined portion of the rubber coating layer 35, four low rubber stopper 36 which projects from the rubber coating layer 35 in the axially outward, ..., and 36, the low rubber stopper 36, ..., and even greater than 36 Four high rubber stoppers 37,... , 37 projecting are arranged at a distance in the circumferential direction.
[0030]
The cylindrical mount of the present embodiment configured as described above is used as a differential mount for supporting a differential mounted on an automobile on a vehicle body in a vibration-proof manner. That is, as shown in FIG. 3, this cylindrical mount press-fits and fixes the cylindrical main body portion 21 of the outer cylindrical member 2 in the mounting hole 55 a provided in the differential carrier 55 and is inserted into the inner hole of the main shaft member 1. The mounting bolt 61 is attached to the mounting portion 60 on the vehicle body side by tightening and fixing the main shaft member 1 together with the mounting substrate 60a, and the axial direction thereof is arranged to be the load input direction (main vibration input direction). The In this case, the direction connecting the pair of auxiliary support portions 33, 33 (arrow X direction in FIG. 2) is the longitudinal direction of the automobile, and the direction connecting the pair of rubber main body portions 32, 32 (arrow Y direction in FIG. 2). Are arranged in the left-right direction of the automobile.
[0031]
As a result, the auxiliary support portions 33, 33 of the rubber elastic body 3 are brought into axial contact with the inner surfaces of the bottom walls of the mounting holes 55a of the differential carrier 55 and the mounting substrate 60a, with the tips of the protruding portions 33a, 33a being in pressure contact with each other. A predetermined amount is compressed. Further, the low rubber stoppers 36,... , 36 and the high rubber stoppers 37,... , 37 provided on the outer flange portion 22 of the outer cylinder member 2 face the mounting substrate 60a with a predetermined distance therebetween. Further, the rubber stoppers 38 and 39 provided on the mounting portion 60 on the vehicle body side are separated from the outer surface of the bottom wall of the mounting hole 55a of the differential carrier 55 or the end surface of the rubber main body 32 of the rubber elastic body 3 by a predetermined distance. Opposite.
[0032]
Note that a plurality of cylindrical mounts are used for one differential. However, in consideration of pitching during traveling of the vehicle, the mounting method of the cylindrical mounts differs on both sides in the front-rear direction of the vehicle. That is, contrary to the above, the outer cylindrical member 2 is press-fitted and fixed in the mounting hole provided on the vehicle body side, and the main shaft member 1 is fastened and fixed to the mounting portion of the differential carrier by the mounting bolt 61, whereby the cylindrical mount is fixed. Mounted upside down.
[0033]
When axial vibration (load) is input to the cylindrical mount disposed in this way, the vibration, that is, the relative displacement in the axial direction between the main shaft member 1 and the outer cylindrical member 2 is caused by the rubber elastic body 3. The rubber main body portions 32 and 32 are sheared and deformed, and the auxiliary support portions 33 and 33 are compressed and deformed effectively. Further, when a large vibration in the axial direction is entered, a low rubber stopper 36 provided in the outer flange 22, ..., 36 and high rubber stopper 37, ..., 37 and the rubber stopper 38 provided in the mounting portion 60, The excessive displacement in the axial direction is elastically restricted by 39, thereby ensuring durability.
[0034]
As described above, according to the cylindrical mount of the present embodiment, the rubber elastic body 3 is formed separately from the rubber main body portions 32 and 32 by the straight 31 and 31 penetrating in the axial direction, and is formed as an outer cylinder member. 2 has a pair of auxiliary support portions 33 and 33 fixed to the inner peripheral surface, so that the required durability can be ensured and the rubber stoppers 36, 37 and 38 can be avoided while avoiding the increase in size in the axial direction. , 39, the range of the low spring constant region in the linear region before functioning can be expanded. In particular, since the auxiliary support portions 33 and 33 are provided between the main shaft member 1 and the outer cylinder member 2, a sufficiently long axial length can be secured, so that necessary durability is ensured. This is also advantageous in avoiding an increase in size in the axial direction.
[0035]
In addition, since the auxiliary support portions 33 and 33 are separated from the rubber main body portions 32 and 32 by the straightening 31 and 31, they are not affected at all by the movement of the rubber main body portions 32 and 32. There is little change in the spring, and stable spring characteristics can be maintained.
[0036]
In addition, when the cylindrical mount is attached, the auxiliary support portions 33 and 33 are compressed by a predetermined amount by the protruding portions 33a and 33a provided at both ends in the axial direction being pressed against the differential carrier 55 and the mounting substrate 60a. Therefore, a certain spring rigidity can be stably exhibited from the initial stage of vibration input, and the desired spring characteristics can be easily obtained.
[0037]
Further, since a pair of auxiliary support portions 33 and 33 are provided so as to be axially symmetric with respect to the main shaft member 1, the balance between the front and rear direction and the left and right direction of the automobile can be improved.
[0038]
Further, in the cylindrical mount of the present embodiment, the low rubber stoppers 36, 36, and 36 for restricting large axial displacements of the outer cylinder member 2 and the main shaft member 1 are applied to the outer flange portion 22 of the outer cylinder member 2. Since the rubber stoppers 37, ... , 37 are provided, excessive deformation of the rubber elastic body 3 can be prevented and durability can be improved.
[Brief description of the drawings]
1 is a cross-sectional view taken along the axial direction of a cylindrical mount according to an embodiment of the present invention, and is a cross-sectional view taken along the line II in FIG.
FIG. 2 is a bottom view of the cylindrical mount according to the embodiment of the present invention viewed from the axial direction.
FIG. 3 is a cross-sectional view showing a mounting state of the cylindrical mount according to the embodiment of the present invention.
FIG. 4 is a cross-sectional view showing a mounting state of a conventional cylindrical mount.
FIG. 5 is a graph showing spring characteristics as seen from the relationship between load and deflection of a conventional cylindrical mount.
FIG. 6 is a cross-sectional view showing an attached state of another conventional cylindrical mount.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1, 71, 81 ... Main shaft member 2, 72, 82 ... Outer cylinder member 3, 73, 83 ... Rubber elastic body 21 ... Cylindrical main-body part 22, 72a, 82a ... Outer flange part 23 ... Curved part 31, 83a ... Straight 32 ... Rubber body 33 ... Auxiliary support 33a ... Projection 35 ... Rubber coating layer 36 ... Low rubber stopper 37 ... High rubber stopper 38, 39, 66, 74, 84 ... Rubber stopper 51 ... Bracket 51a, 55a ... Mounting hole 55 ... Differential carrier 60 ... Mounting portion 60a ... Mounting substrate 61 ... Mounting bolt 67 ... Rubber support

Claims (5)

A main shaft member, an outer cylinder member arranged coaxially at a distance from the outer side of the main shaft member, and a rubber elastic body interposed between the main shaft member and the outer cylinder member. A load is applied in the axial direction. In a cylindrical mount that is mounted to input,
The rubber elastic body affects the movement of the rubber main body part integrally connecting the main shaft member and the outer cylinder member, and the movement of the rubber main body part shearing in the axial direction due to the piercing provided in the axial direction. It is formed separately from the rubber main body so as not to be received, and is fixed to the inner peripheral surface of the outer cylinder member, and axially outward from both ends of the outer cylinder member from the radially inner portion of both axial end surfaces thereof A cylindrical mount comprising: an auxiliary support portion having a protruding portion that protrudes toward the surface. The auxiliary support portion is configured to be attached in a state where the tips of the protruding portions are in pressure contact with an attachment counterpart member to which the main shaft member is fixed and an attachment counterpart member to which the outer cylinder member is fixed. The cylindrical mount according to claim 1 , wherein: The cylindrical mount according to claim 1 or 2 , wherein a plurality of auxiliary support portions are arranged at equal intervals in the circumferential direction. The elastic stopper which controls the large displacement of the axial direction of the said outer cylinder member and the said main shaft member is provided in the edge part of the said outer cylinder member, The Claim 1 characterized by the above-mentioned. Cylindrical mount. The rubber elastic body spreads in a plane at axially symmetrical positions on both sides of the main shaft member and is formed in a pair so as to be parallel to each other, and a cross section located on both sides of the main shaft member between the pair of the curls 5. A pair of the rubber main body portions each having a circular arc shape and a pair of auxiliary support portions positioned on the outside of the pair of straight portions and having a cross-section having a bow shape. The cylindrical mount according to Crab.

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