Conical double-layer vibration isolation mount

Abstract

FIELD: mechanical engineering.SUBSTANCE: conical double-layer vibration-isolating support includes upper and lower double-layer rubber conical elastic elements, a housing and a metal tie. The support is also provided with a safety washer located above the upper two-layer rubber conical elastic element configured to limit the movements of the sprung object and prevent its detachment from the supporting system in the event of failure of the rubber elastic element, a spacer sleeve installed on a metal tie between the elastic elements and configured to regulate the degree of their preliminary compression, and cups of elastic elements with a conical surface, to which the corresponding elastic element is vulcanized. The cups are rigidly secured in the housing and are designed to provide a guiding action when the elastic elements are deformed.EFFECT: improved vibration-insulating properties.1 cl, 2 dwg

Description

[0001] The invention relates to transport engineering, namely to motor vehicles, and can be used in the design of a suspension system for units installed on the supporting system of motor vehicles.

[0002] A wedge-shaped vibration-isolating mount is known for springing an internal combustion engine on a vehicle's supporting system, comprising a housing, a wedge-shaped support element, and two double-layer rubber cushions located on the sides of the wedge-shaped support element and providing an elastic connection of the support element to the vehicle's supporting system. The operating principle of said vibration-isolating mount consists in damping vibrations from the engine transmitted to the vehicle's supporting system only in the vertical, longitudinal, and longitudinal-angular directions. Thin rubber pads are installed in the other three directions, designed to protect against a hard metal impact of the wedge-shaped support element on the vehicle's supporting system (see patent DE 10 2007 053 670, IPC B60K 5 / 12, published 2009.01.29).

[0003] The disadvantages of this design include its relatively low efficiency. It is well known that vibrations of components mounted on a vehicle's support system occur in all six directions, and the intensity of these vibrations is approximately equal. Consequently, the vibration isolation properties of this wedge-shaped vibration isolator for internal combustion engine suspension cannot be considered satisfactory in three of the six degrees of freedom, which is a drawback of this design.

[0004] A vibration-isolating support is known, the upper and lower conical rubber elastic elements of which are connected by vulcanization with corresponding conical supports, consisting of two layers of rubber: internal and external, while the upper and lower conical supports are rigidly connected to the frame of the vehicle and between them a ring with radial holes is coaxially located, as well as a tie installed coaxially with the elements of the vibration-isolating support.

[0005] The operating principle of the specified vibration-isolating support is to dampen vibrations from the sprung unit, transmitted to the supporting system of the vehicle, in all six directions through the use of two-layer conical rubber supports (see patent for utility model RU226859U1, published 06 / 26 / 2024).

[0006] The disadvantages of this design are the absence of both a safety element that ensures a reliable connection of the sprung object with the supporting system in the event of failure of the rubber elastic element, and a spacer sleeve that ensures precise regulation of the degree of necessary preliminary compression to form the correct elastic damping characteristics of the vibration isolating support.

[0007] The purpose of the invention is to improve the vibration-isolating characteristics of a vibration-isolating support of a suspension system of a unit installed on a supporting system of a motor vehicle by providing an elastic-damping connection of the unit with the supporting system in all six directions without the risk of a possible collision.

[0008] This goal is achieved in the following way.

[0009] 1. The use of a spacer sleeve allows for precise adjustment of the required pre-compression to achieve the correct elastic damping characteristics of the vibration isolator mount.

[0010] 2. The use of a safety washer serves as an additional measure to reduce harmful sway of the sprung object by creating a nonlinear elastic damping characteristic of the vibration-isolating support, and also prevents the sprung object from detaching from the supporting system in the event of failure of the rubber elastic element.

[0011] 3. The use of an elastic element cup will ensure reliable fixation of the conical elastic elements in it through the vulcanization process and implement the function of a guide device during deformation of the elastic elements.

[0012] The new invention is the use of:

[0013] 1. spacer sleeve, allowing precise adjustment of the degree of preliminary compression of conical elastic elements;

[0014] 2. a safety washer that forms a nonlinear elastic damping characteristic and prevents the sprung object from being disconnected from the supporting system;

[0015] 3. Cups of elastic elements, providing vulcanization of conical elastic elements, guiding action during deformation and unification of the design for various operating conditions.

[0016] List of drawing figures

[0017] The attached drawings show a conical double-layer vibration isolator. In Fig. 1, the numbers indicate:

[0018] 1 - vibration-isolated object;

[0019] 2 - supporting system of a motor vehicle;

[0020] 3 - upper two-layer rubber conical elastic element;

[0021] 4 - lower two-layer rubber conical elastic element;

[0022] 5 - body;

[0023] 6 - safety washer;

[0024] 7 - spacer sleeve;

[0025] 8 - metal tie;

[0026] 9 - elastic element cup;

[0027] 10 - cup fastener.

[0028] In Fig. 2 the numbers indicate:

[0029] 1 - vibration-isolated object;

[0030] 2 - supporting system of a motor vehicle;

[0031] 3 - upper two-layer rubber conical elastic element;

[0032] 4 - lower two-layer rubber conical elastic element;

[0033] 5 - body;

[0034] 6 - safety washer;

[0035] 7 - spacer sleeve;

[0036] 8 - metal tie;

[0037] 9 - elastic element cup;

[0038] 10 - cup fastener.

[0039] Device Description

[0040] The conical double-layer vibration-isolating mount (Fig. 1) includes an upper rubber conical elastic element 3, which bears the weight of the sprung object 1 and provides the generation of a restoring force in the vertical direction when it acts from top to bottom, and a lower rubber conical elastic element 4, which provides the generation of a restoring force in the vertical direction when it acts from bottom to top. The combined elastic deformation of the upper 3 and lower 4 conical elastic elements provides the generation of restoring forces and moments in all the other five directions.

[0041] The upper 3 and lower 4 conical elastic elements rest on and are rigidly vulcanized to the cups of the elastic element 9, which play the role of guide devices during deformation of the elastic elements, secured with the help of the cup fastener 10 in the housing 5, rigidly connected to the supporting system 2 of the vehicle.

[0042] The upper 3 and lower 4 conical rubber elastic elements consist of two layers: an inner (harder) and an outer (softer) layer. To ensure consistent operation of the upper and lower conical rubber elements in both the radial and axial directions of vibration isolation mount deformation, the interface between the rubber layers should not intersect the boundaries of the elastic element cup, but should instead intersect the upper and lower surfaces of the conical rubber elastic element.

[0043] Safety washer 6 serves as an additional measure to reduce harmful swinging of the sprung object, and also prevents the sprung object from being disconnected from the supporting system in the event of failure of the rubber elastic element.

[0044] The coordinated deformation of the upper 3 and lower 4 conical rubber elastic elements and their preliminary compression is ensured by a metal tie 8 and a spacer sleeve 7, installed coaxially to the elastic elements 3 and 4 and allowing for precise adjustment of their compression using a threaded connection.

[0045] The conical double-layer vibration damper mount comprises an upper rubber conical elastic element that supports the weight of the sprung object and generates a vertical restoring force when applied downwards. A lower rubber conical elastic element generates a vertical restoring force when applied upwards. The combined elastic deformation of the upper and lower conical elastic elements generates restoring forces and moments in all five other directions.

[0046] The upper and lower conical elastic elements are vulcanized to cups, which are secured to the vibration isolator housing using cup fasteners, which are rigidly attached to the vehicle's supporting structure. The vibration isolator housing contains openings that allow air to flow freely when the internal volume of the vibration isolator changes due to the varying deformation of the rubber conical elements, improving the damping properties of the vibration isolator.

[0047] The elastic element cup's function is to securely fasten the conical elastic elements during the vulcanization process and to act as a guide during deformation of the elastic elements. The elastic element cup simplifies the vulcanization process and makes the vibration isolation mount design unified for various tasks and operating conditions.

[0048] The safety washer's function is to ensure secure attachment of the sprung object to the vehicle's supporting structure in emergency situations involving failure of the conical elastic elements of the vibration-isolating mount. At high displacement amplitudes, the safety washer creates a nonlinear elastic characteristic of the vibration-isolating mount due to the parallel operation of the inner and outer layers of the rubber elastic elements, which in turn limits these movements.

[0049] The coordinated deformation of the upper and lower conical rubber elastic elements and their preliminary compression is carried out by means of an integrated system consisting of a metal tie and a spacer sleeve installed coaxially with the elastic elements and allowing precise adjustment of the degree of preliminary compression of the elastic elements by means of a threaded connection, which ensures optimal load distribution between the elastic components of the vibration isolating support.

[0050] The conical double-layer vibration isolator mount works as follows.

[0051] Before putting into operation, when assembling the conical two-layer vibration-isolating mount (Fig. 2), it is necessary to press the upper 3 and lower 4 conical rubber elastic elements using a metal clamp 8 to a state of static compression, which is ensured by a long spacer sleeve 7, under a vertical load from the vibration-isolated object 1. During the movement of the vehicle, there is a relative movement of the vibration-isolated object 1 and the supporting system 2 of the vehicle (Fig. 1) in all six possible directions. In this case, deformation of the rubber layers of the upper 3 and lower 4 conical rubber elastic elements will occur (soft layers to a greater extent, hard layers to a lesser extent), and in the rubber layers, compression stresses will prevail rather than shear or tension stresses, which will have a positive effect on the durability of the product.The deformation of the rubber mass creates elastic restoring forces and moments and prevents a hard impact between the vibration-isolated object 1 and the vehicle's supporting system 2. A safety washer prevents the sprung object from detaching from the supporting system in the event of failure of the rubber elastic element. The different stiffnesses of the rubber layers of the upper 3 and lower 4 conical rubber elastic elements, internal losses in the rubber mass during its deformation, and air throttling through radial openings in the housing 5, along with the use of a safety washer 6, which creates a nonlinear elastic-damping characteristic, prevent vibration-isolated object 1 from swinging.

Claims

A conical two-layer vibration-insulating support comprising upper and lower two-layer rubber conical elastic elements that bear the weight of a sprung object and provide for the creation of restoring elastic forces and moments, a housing designed with the possibility of a rigid connection with the frame of a motor vehicle, as well as a metal coupler installed coaxially with the elastic elements and providing a coordinated deformation of the upper and lower conical rubber elastic elements and their preliminary compression, characterized in that it is provided with a safety washer located above the upper two-layer rubber conical elastic element and designed with the possibility of limiting the movements of the sprung object and preventing its disconnection from the supporting system in the event of failure of the rubber elastic element, a spacer sleeve,installed on a metal tie between the upper and lower two-layer rubber conical elastic elements and designed with the possibility of adjusting the degree of their preliminary compression, and cups of elastic elements with a conical surface to which the corresponding conical elastic element is vulcanized, wherein said cups are rigidly fixed in the housing and are designed with the possibility of guiding action during deformation of the elastic elements.

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