JPH04160244A - Cylindrical mount and its manufacture - Google Patents

Abstract

PURPOSE:To obtain a stopper mechanism which exhibits the effective displacement restraining function by providing an outer cylindrical fitting with a through window, providing stopper rubber and a cylindrical member, and thereby pushing stopper rubber into a cavity by the use of the cylindrical member. CONSTITUTION:In an integrally vulcanized and molded article 18, stopper rubber 46 which is projected outside for positioning through the second window section 30 of an outer cylindrical fitting 12, is pressed at its projected end face by a mounting cylindrical fitting 16 when the mounting cylindrical fitting 16 is outwardly fitted or fixed to the integrally vulcanized and molded article 18. This thereby causes stopper rubber to be pressed in a cavity 20. This thereby causes stopper rubber 46 to be projected into the cavity 20 side by the amount pushed in. When stopper rubber 46 is projected into the cavity 20 side, the inside dimension of the cavity 20 is compressed so as to be smaller than the integrally vulcanized and molded article 18, stopper rubber 46 is brought into contact with the inner circumferential surface of the cavity 20 at an inner cylindrical fitting side with stopper rubber pushed in by the mounting cylindrical fitting 16.

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a cylindrical mount device suitably used as an engine mount for automobiles, etc., and a method for manufacturing the same, and particularly relates to a relative displacement amount of a connected body when a large load is input. The present invention relates to a cylindrical mount equipped with a stopper mechanism for regulating the mount and a method for manufacturing the same.

(Background Art) Conventionally, vibration transmission systems have been interposed between members that constitute vibration transmission systems.
As a type of vibration-proof connection body that connects these two parts, an inner cylindrical metal fitting and an outer cylindrical metal fitting placed outside the inner cylindrical metal fitting at a predetermined distance are connected by a rubber elastic body interposed between them. In general, so-called cylindrical mounts are known that are designed to mainly dampen vibrations input in the direction perpendicular to the axis between the inner and outer cylindrical metal fittings, and are suitably used, for example, as engine mounts for automobiles, suspension bushes, etc. It's been getting worse.

By the way, when such a cylindrical mount is installed, if an initial load is applied between the inner and outer cylindrical fittings due to the weight of the supported body or the torque transmitted between the connected bodies, etc.
In order to ensure the durability of the rubber elastic body, a space is provided between the inner and outer cylindrical fittings on the side where tensile deformation is caused in the rubber elastic body due to the initial load, which penetrates in the axial direction and extends for a predetermined length in the circumferential direction. It is desirable to alleviate or prevent the generation of tensile stress in the rubber elastic body by forming the rubber elastic body.

However, when such a space is formed, when the mount is attached, the inner cylinder metal fitting is largely displaced in the direction opposite to the hollow space with respect to the outer cylinder metal fitting due to the deformation of the rubber elastic body due to the initial load as described above. , Since the internal dimensions of such a space will increase, under such mounting conditions, when a large vibration load is input, the inner cylindrical metal fitting will have a larger impact on the outer cylindrical metal fitting.
There has been a problem in that it is difficult to regulate the amount of relative displacement toward the void side (rebound direction opposite to the direction of action of the initial load).

Therefore, in the past, as shown in, for example, Japanese Utility Model Application No. 2-94/952, the amount of increase in the internal dimensions of the void space due to the initial load applied at the time of mounting the mount was taken into consideration, and the A stopper member having a wall thickness equal to or larger than the internal dimensions of the cavity in the
A stopper mechanism is adopted in which the relative displacement amount of the inner and outer cylindrical fittings in the rebound direction is regulated by fitting the inner and outer cylindrical fittings into contact with each other through the stopper member by fitting and mounting the stopper mechanism into such a space. It has been done.

However, in a stopper mechanism with such a structure, a stopper member formed separately from the mount body must be assembled to the mount body, which increases the number of parts and the assembly process, resulting in a decrease in manufacturability and Higher costs were unavoidable.

(Problem to be solved) Here, the present invention has been made against the background of the above-mentioned circumstances, and the problem to be solved is:
A cylindrical mount in which a stopper mechanism for regulating the amount of relative displacement of an inner cylindrical metallic odor toward an outer cylindrical metal fitting toward a cavity side can be advantageously realized with a simple structure without requiring a separate member, and its manufacture. The purpose is to provide a method.

(Solution Means) In order to solve this problem, the present invention includes an inner cylindrical metal fitting and an outer cylindrical metal fitting arranged outside the inner cylindrical metal fitting with a predetermined distance between them. In the cylindrical mount, the inner and outer cylindrical fittings are connected by a rubber elastic body, and a hollow space is provided between the inner and outer cylindrical fittings, extending a predetermined length in the circumferential direction and penetrating in the axial direction, the hollow space in the outer cylindrical fitting. A through window is provided in the cylindrical wall portion located on the outside of the cylindrical wall, and a stopper rubber is provided that is fixed to the outer cylindrical metal fitting and projects outwardly through the through window at a predetermined height, and further provided on the outer circumferential surface of the outer cylindrical metal fitting. It is characterized in that a cylindrical member having an inner hole into which it is fitted is provided, and the stopper rubber is pushed into the cavity by the cylindrical member.

Further, the present invention provides that an inner cylindrical metal fitting and an outer cylindrical metal fitting arranged outside the inner cylindrical metal fitting at a predetermined distance are connected by a rubber elastic body interposed between them, and that the inner cylindrical metal fitting and the outer cylindrical metal fitting are A method for manufacturing a cylindrical mount, in which a hollow space extending a predetermined length in the circumferential direction and penetrating in the axial direction is formed between the cylindrical mount and the cylindrical mount, wherein: While being integrally vulcanized and bonded to the elastic body, a through window is provided in a portion of the cylinder wall located outside the cavity in the outer cylinder metal fitting, and the through window is fixed to the outer cylinder metal fitting. a step of preparing an integrally vulcanized molded product having a stopper rubber protruding outward at a predetermined height through the vulcanized product;
preparing a cylindrical member having an inner hole into which the outer cylindrical metal fitting in the integrally vulcanized molded product is inserted;
(c) By inserting the integrally vulcanized molded product into the inner hole of the cylindrical member and externally fitting and fixing the cylindrical member to the outer peripheral surface of the outer cylindrical metal fitting, the protruding end surface of the stopper rubber The method of manufacturing a cylindrical mount includes the step of pressing the stopper rubber with the cylindrical member to push the stopper rubber into the cavity.

(Operation/Effect) That is, in the cylindrical mount according to the present invention, the stopper rubber is pushed in by the cylindrical member, so that the stopper rubber protrudes approximately by an amount corresponding to the amount of protrusion from the through window. The stopper rubber is made to protrude at a predetermined height from the outer tube fitting (cylindrical member) side toward the inner tube fitting side within the space by the amount of the stopper rubber. By coming into contact with the inner cylindrical metal fitting through the inner cylindrical member, a stopper function is exerted to restrict the amount of displacement of the inner cylindrical metal fitting toward the empty space side with respect to the outer cylindrical metal fitting.

Therefore, if such a cylindrical mount is manufactured according to the method of the present invention, when molding an integrally vulcanized molded product, the internal dimensions of the void space can be secured to the extent that the moldability is not inhibited, and after molding, The initial load can be reduced by fitting the cylindrical member to the outside and making the stopper rubber protrude into the cavity to reduce the inner dimension of the cavity, or by bringing the stopper rubber into contact with the inner surface of the cavity on the inner cylinder metal fitting side. This means that a stopper mechanism can be advantageously realized that can exhibit an effective displacement regulating function even when the mount is attached to the mount.

In addition, in the manufacturing method of such a cylindrical mount,
Since the stopper rubber is formed as an integrally vulcanized product that is vulcanized and bonded to the outer cylinder metal fitting, the excellent stopper mechanism described above can be achieved without increasing the number of parts.
It can be applied with good manufacturability.

(Examples) Hereinafter, in order to clarify the present invention more specifically, examples of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 to 3 show an example of an engine mount for an automobile as an embodiment of the present invention.

In these figures, lO and 12 are an inner cylinder metal fitting and an outer cylinder metal fitting, respectively, which are arranged at a predetermined distance from each other in the radial direction and eccentrically by a predetermined amount. They are connected by a rubber elastic body 14. Further, a mounting tube fitting 16 is fitted onto the outer peripheral surface of the outer tube fitting 12 and is integrally fitted and fixed thereto. In this engine mount, the inner cylindrical metal fitting 10 and the mounting cylindrical metal fitting 16 are attached to either the vehicle body side or the power unit side, so that the power unit is supported against vibration against the vehicle body. In addition, in this installed state, the weight of the power unit is applied as an initial load between the inner cylindrical fitting 10 and the mounting cylindrical fitting 16, so that both fittings 10 and 16 are positioned approximately concentrically. (See Figure 7). In addition, under such mounting conditions, the main vibration that should be damped is input to the engine mount in the eccentric direction (vertical direction in FIG. 1) between the inner cylinder fitting 10 and the mounting cylinder fitting 16. The Rukoto.

Hereinafter, the specific structure of such an engine mount will be explained according to its manufacturing method.

That is, when manufacturing the engine mount as described above, first, the inner cylindrical metal fitting 10 and the outer cylindrical metal fitting 12 are respectively housed and placed in a mold of the rubber elastic body 14, and the inner and outer cylindrical metal fittings 10° and 12 are spaced apart. filled with rubber material,
By vulcanization molding, an integrally vulcanized molded product 18 as shown in FIGS. 4 to 6 is formed.

In the integrally vulcanized molded product 18 formed in this manner, the inner cylindrical metal fitting 10 having a thick-walled cylindrical shape is spaced a predetermined distance radially outwardly and eccentrically by a predetermined amount. An outer cylindrical metal fitting 12 having a thin-walled cylindrical shape is positioned, and a rubber elastic body 14 having a substantially thick-walled cylindrical shape is interposed between the inner and outer cylindrical metal fittings 10 and 12. The structure is such that an inner cylindrical metal fitting 10 is bonded to the circumferential surface, and an outer cylindrical metal fitting 12 is vulcanized and bonded to the outer circumferential surface.

Further, in the rubber elastic body 14, on the side where the separation distance between the inner and outer cylinder fittings 10 and 12 in the eccentric direction is smaller, a space 20 that penetrates in the axial direction is provided between the inner and outer cylinder fittings 10 and 12. It is provided so as to extend approximately half a circumference in the circumferential direction. That is, by providing this space 20, the inner and outer cylindrical fittings 10.12 are substantially connected by the rubber elastic body 14 only on the side where the separation distance is greater, thereby making it possible to attach the mount. The tensile stress generated in the rubber elastic body 14 due to the initial load applied at times is reduced as much as possible, and its durability can be improved.

Furthermore, the inner and outer cylindrical fittings 1 in the rubber elastic body 14
A first pocket portion 22 is formed on the side with a larger separation distance of 0.12, and is opened to the outer circumferential surface through a first window portion 24 provided in the outer cylinder fitting 12.

Note that an annular reinforcing metal fitting 26 is arranged around the first pocket portion 22 and is fixed to the rubber elastic body 14, and the rubber elastic body 14 constituting the peripheral wall portion of the second pocket portion 22 is fixed to the rubber elastic body 14. Irregular deformations such as buckling are now regulated.

Furthermore, a second pocket part 22 is provided on the side of the rubber elastic body 14 where the distance between the inner and outer cylinder fittings 10.12 is smaller, which is radially opposed to the first pocket part 22 with the inner cylinder fitting 10 interposed therebetween. A pocket portion 28 is formed and is opened to the outer circumferential surface through a second window portion 30 provided in the outer cylindrical metal fitting 12.

Further, in the second pocket portion 28, the rubber elastic body 14 constituting the bottom wall portion 32 is thinned by the space 20, so that elastic deformation can be easily tolerated. ing.

In addition, the bottom wall portion 32 of the second pocket portion 28 includes:
The stopper rubber 46 that protrudes radially outward is integrally formed by increasing the thickness at the substantially central portion. And, in such a stopper rubber 46,
The protruding end surface thereof is made to protrude outward from the outer cylindrical fitting 12 at a predetermined height through a second window portion 30 provided in the outer cylindrical fitting 12.

On the other hand, a stopper fitting 34 that projects radially outward at a predetermined height toward the opposing direction of the first and second pocket portions 22.28 is fitted and fixed to the inner cylinder fitting IO. There is. In the stopper metal fitting 34, first and second stopper parts 36 and 38 project from the inner cylindrical metal fitting 10 side into the first pocket part 22 and the empty space 2o at a predetermined height, respectively. It is composed of

Further, the outer cylindrical metal fitting 12 has a wide opening opening in the outer circumferential surface and extending in the circumferential direction, spanning between both ends of the first window part 24 and the second window part 30 in the circumferential direction. Concave circumferential groove 40
is formed. Furthermore, a rubber elastic body 14 is integrally rotated on the outer circumferential surface of the outer cylinder fitting 12 to form a sealing rubber layer 42 over almost the entire surface thereof, and also in the circumferential groove 40° 40. Filled. The sealing rubber layers 42 filled in the circumferential grooves 40 and 40 each have a curved or bent shape in the circumferential direction and extend for a predetermined length to form the opening of the first pocket portion 22 and the second pocket portion. A groove 44 is formed that connects the opening of the pocket portion 28 (
(See Figure 6).

On the other hand, in a process separate from the formation of such an integrally vulcanized molded product 18, the mounting cylindrical fitting 16 as a cylindrical member is formed. The mounting cylindrical fitting 16 is formed to have a cylindrical shape that is larger in circumference than the outer cylindrical fitting 12 so that the outer cylindrical fitting 12 can be inserted into the inner hole 48 thereof.

Next, the outer cylindrical metal fitting 12 in the integrally vulcanized molded product 18
If necessary, the rubber elastic body 14 is pre-compressed by performing a diameter reduction process such as eight-way drawing, and then, as shown in FIGS. 1 to 3, the integral extrapolate the mounting tube fitting 16 onto the vulcanized molded product 18;
Furthermore, after that, the mounting tube fitting 16 is subjected to a diameter reduction process such as an eight-way drawing process, thereby fitting and fixing the attachment tube fitting 16 to the outer circumferential surface of the outer tube fitting 12 and assembling it integrally. Through this assembly operation, the desired engine mount is completed.

That is, in the engine mount manufactured in this way,
The openings of the second pocket portions 22 and 28 are respectively closed by the mounting cylinder fittings 16, and internal pressure fluctuations are induced in the first pocket portion 22 when vibration is input based on the deformation of the rubber elastic body 14. A pressure receiving chamber 50 is formed in the second pocket portion 28, and a volume-variable equilibrium chamber 52 in which internal pressure fluctuations are absorbed based on the elastic deformation of the bottom wall portion 32 are formed in the second pocket portion 28. Predetermined incompressible fluids such as water, alkylene glycol, polyalkylene glycol, silicone oil, etc. are sealed inside the equilibrium chambers 50 and 52, respectively. The incompressible fluid can be filled into the pressure receiving chamber 50 and the equilibrium chamber 52 by, for example, performing an extrapolation operation on the integrally vulcanized product 18 of the mounting tube fitting 16 into the fluid. , will be implemented.

Further, the opening of the groove 44.44 is also
6, and within each groove 44,
An orifice passage 54 is formed that communicates the pressure receiving chamber 50 and the equilibrium chamber 52 with each other.

In this embodiment, based on the resonance effect of the fluid flowing through these orifice passages 54,
It is designed to exhibit a high damping effect when inputting vibrations in the low frequency range that correspond to shakes, bounces, etc.

On the other hand, in the engine mount manufactured as described above, in the integrally vulcanized molded product 18, the stopper rubber 46 is positioned to protrude outward through the second window portion 30 of the outer cylinder fitting 12. However, when the mounting cylindrical fitting 16 is inserted into and fitted into the integrally vulcanized molded product 18, the protruding end surface is pressed by the mounting cylindrical fitting 16, so that it is pressed into the space 20, and thereby On the contrary, the stopper rubber 46 is made to protrude toward the space 20 by the amount that it is pressed.

Since the stopper rubber 46 is projected toward the space 20, the inner dimension of the space 20 is smaller than that of the integrally vulcanized molded product 18. In particular, in this embodiment, The stopper rubber 46 is pressed down by the mounting tube fitting 16, so that it is brought into contact with the inner circumferential surface of the space 20 on the inner tube fitting side.

Therefore, in the engine mount having such a structure, large vibrations are input between the inner cylinder metal fitting 10 and the mounting cylinder metal fitting 16 when mounted on a vehicle as shown in FIG. When the first stopper part 36 protrudes into the pressure receiving chamber 50 comes into contact with the mounting cylinder fitting 12, a stopper function in the bounding direction is exerted, and the protruding position into the empty space 20 is exerted. When the second stopper portion 38 is brought into contact with the mounting tube fitting 16 via the stopper rubber 46, a stopper function in the rebound direction is exerted.

In addition, in such an engine mount, as mentioned above, the stopper rubber 4 is
6 is brought into contact with the second stopper part 38 side, and the empty space 2
0 disappears, the engine mount is mounted on the vehicle, and the inner cylinder metal fitting 10 and the mounting cylinder metal fitting 1 are attached.
Even under the condition that both of the tools 10 and 16 are positioned substantially concentrically due to the power unit load input between the space 20 and the power unit 6, the space 20 is formed with a sufficiently small inner dimension: l. Therefore, the stopper function in the rebound direction can be effectively exerted.

Furthermore, according to the manufacturing method described above, the stopper rubber 46 is fixed to the outer cylinder fitting 12 and formed as an integrally vulcanized molded product I8, so the number of parts and manufacturing steps can be reduced. Excellent productivity and cost efficiency can be enjoyed.

In addition, in particular, in this embodiment, the stopper rubber 46 is integrally formed with the rubber elastic body 14 constituting the mount body, so that the structure can be simplified even more advantageously. It is possible that the

Furthermore, according to the manufacturing method described above, when molding the integrally vulcanized molded product 18, the inner dimension of the cavity 20 can be set relatively large, so that mold strength etc. may become a problem. Good moldability can be ensured without any problems.

Although the embodiments of the present invention have been described in detail above, these are literal illustrations, and the present invention is not to be construed as being limited only to these specific examples.

For example, the stopper rubber 46 in the integrally vulcanized molded product 18
The amount of protrusion from the outer cylindrical metal fitting 12 is not limited to a certain number, and may be determined as appropriate depending on the stopper function required of the mount and the amount of displacement of the inner and outer cylindrical metal fittings due to the initial load applied when the mount is installed. The Rukoto.

The amount of protrusion of the stopper rubber 46 is set sufficiently, and when the stopper rubber 46 is pushed in by the mounting cylinder fitting 16, the stopper rubber 46 is brought into pressure contact with the inner cylinder fitting 10 side, so that the stopper rubber 46 is pressed against the rubber elastic body 14. It is also possible to provide a radial precompression.

Furthermore, reinforcing metal fittings or the like may be embedded inside such stopper rubber 46.

Further, in the embodiment, the stopper metal fitting 34 fixed to the inner cylinder metal fitting 10 allows the first and second stopper parts 3
6.38 was configured, but such a stopper part 3
6.38 does not necessarily need to be provided, and the stopper rubber 46 may be brought into direct contact with the inner cylindrical fitting 10 or may be brought into contact via the rubber elastic body 14.

Furthermore, as the cylindrical member fitted to the outer circumferential surface of the outer cylindrical metal fitting, it is also possible to employ an arm member in which a mounting hole is formed, a bracket in which a mounting portion is integrally provided, or the like.

Furthermore, it is also possible to use a pair of ring-shaped metal fittings that are vulcanized and bonded to the outer peripheral surfaces of the rubber elastic body on both sides in the axial direction as the outer cylinder fittings.

Further, in the above embodiment, an example in which the present invention is applied to a fluid-filled cylindrical mount is shown, but the present invention is applicable to a so-called solid type cylindrical mount in which no fluid is sealed. It can also be advantageously applied.

In addition to the engine mounts described above, the present invention can be advantageously applied to automobile differential mounts, suspension bushings, etc., and various cylindrical mounts other than automobiles.

In addition, although not listed, the present invention can be implemented in embodiments with various changes, modifications, improvements, etc. based on the knowledge of those skilled in the art, and such embodiments include: It goes without saying that any of these methods are included within the scope of the present invention as long as they do not depart from the gist of the present invention.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an engine mount according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along ■-■ in FIG. 1, and FIG. 3 is a cross-sectional view taken along ■-■ in FIG. ■It is a sectional view. Moreover, FIG. 4 is a cross-sectional view showing an integrally vulcanized molded product constituting the engine ma-rant shown in FIG. 1, and FIG. FIG. 6 is a right side view of FIG. 4. Furthermore, FIG. 7 is a cross-sectional view showing a state in which the engine mount shown in FIG. 1 is attached to a vehicle. 10: Inner cylinder metal fitting 12: Outer cylinder metal fitting 14: Rubber body 16: Mounting cylinder metal fitting 18 integrally vulcanized molded product
20: Space 24: First window portion 30: Second window portion 32: Bottom wall portion 46: Stopper rubber Fig. 3 Fig. 6

Claims (2)

[Claims] (1) The inner cylindrical metal fitting and the outer cylindrical metal fitting arranged outside the inner cylindrical metal fitting at a predetermined distance are connected by a rubber elastic body interposed between them, and the circumferential In a cylindrical mount having a cavity extending a predetermined length in the direction and penetrating in the axial direction, a through window is provided in a part of the cylinder wall located outside the cavity in the outer cylinder metal odor, and A stopper rubber is fixed to the cylindrical metal fitting and protrudes outward through the through-hole at a predetermined height, and a cylindrical member having an inner hole that is fitted to the outer peripheral surface of the outer cylindrical metal fitting is provided. A cylindrical mount characterized in that the stopper rubber is pushed into the space by a shaped member. (2) The inner cylindrical metal fitting and the outer cylindrical metal fitting arranged at a predetermined distance on the outside thereof are connected by a rubber elastic body interposed between them, and between the inner and outer cylindrical metal fittings, A method for manufacturing a cylindrical mount in which a cavity is formed that extends a predetermined length in the circumferential direction and penetrates in the axial direction, the inner cylindrical metal fitting and the outer cylindrical metal fitting being integral with the rubber elastic body. At the same time, a through window is provided in the cylindrical wall portion of the outer cylindrical metal fitting located outside the cavity, and the outer cylindrical metal fitting is fixed to the outer cylindrical metal fitting so as to extend outward at a predetermined height through the through window. A step of preparing an integrally vulcanized molded product having a stopper rubber protruding from the side, and a step of preparing a cylindrical member having an inner hole into which the outer cylindrical fitting is inserted and attached in the integrally vulcanized molded product. and, by inserting the integrally vulcanized molded product into the inner hole of the cylindrical member and externally fitting and fixing the cylindrical member to the outer peripheral surface of the outer cylindrical metal fitting, the protruding end surface of the stopper rubber is fixed. A method for manufacturing a cylindrical mount, comprising the step of pushing the stopper rubber into the cavity by pressing with the cylindrical member.