JP4046072B2 - Torque rod - Google Patents

Description

  The present invention relates to a torque rod that is interposed between an engine side and a body side of a vehicle, regulates displacement in the roll direction of the engine and displacement in the front-rear direction, and also performs vibration isolation between the engine side and the body side. .

2. Description of the Related Art Conventionally, a first bush and a second bush at both ends respectively provided with a rigid outer cylinder, an inner cylinder and a rubber elastic body interposed therebetween are connected to the first bush and the second bush in a vehicle. A torque rod having a rigid connecting portion is interposed between the engine side and the body side of the vehicle, and the torque rod receives the torque from the engine to regulate the displacement in the roll direction and the longitudinal displacement of the engine. Things have been done.
The torque rod also has a function of vibration isolation between the engine side and the body side.

FIG. 9 shows an example of a conventionally known torque rod (the following Patent Document 1).
In the figure, reference numerals 200 and 202 denote a first bush and a second bush respectively having rigid inner cylinders 204 and 206, outer cylinders 208 and 210, and rubber elastic bodies 212 and 214 interposed therebetween. Part) 216.

In this torque rod, one of the first bushing 200 and the second bushing 202 is elastically coupled to the engine side in the vehicle and the other is elastically coupled to the body side, and receives torque from the engine while elastically deforming the rubber elastic bodies 212 and 214. Regulates the displacement of the engine in the roll direction and the displacement in the front-rear direction.
Further, vibration insulation is performed between the engine side and the body side based on the elasticity of the rubber elastic bodies 212 and 214.

By the way, in this kind of torque rod, the elastic constant of the rubber elastic body is kept low when idling or the like, and vibration insulation is excellent, while the torque action during acceleration or the front and rear direction input is excessive due to the stopper action of the rubber stopper. Displacement is regulated.
For example, a structure as shown in FIG. 10 is conceivable.

In the drawing, reference numeral 218 denotes a rigid outer cylinder in the bush 219 (here, the second bush), 220 is a rigid inner cylinder, 222 is a rubber elastic body, and a pair of forms expanded from the inner cylinder 220 into a V shape. A rubber leg 224 is provided.
Reference numerals 226 and 228 denote straight portions provided at the front and rear positions of the pair of rubber legs 224, and reference numeral 230 denotes a rigid and ring-shaped intermediate plate provided so as to surround the inner cylinder 220.

A rubber stopper 232 abuts against the intermediate plate 230 during acceleration to act as a stopper and restricts the relative displacement of the inner cylinder 220 in the right direction in the figure, and protrudes toward the intermediate plate 230 inside the straight portion 228. In this state, the outer cylinder 218 is provided.
Note that the provision of the rigid and ring-shaped intermediate plate 230 so as to surround the inner cylinder 220 is disclosed in, for example, Patent Document 2 below.

Incidentally, in the torque rod shown in FIG. 10, it is desirable to lower the spring constant of the rubber elastic body 222, that is, the rubber leg 224, in order to satisfactorily perform vibration isolation during idling.
However, if the spring constant is lowered, the stopper contact at the time of acceleration is accelerated, that is, when the rubber leg 224 is displaced, the stopper 232 comes into contact with the intermediate plate 230 at an early stage, thereby increasing the overall spring constant. It encourages the roaring sound in the passenger compartment.

On the other hand, when the spring constant of the rubber leg 224 is increased to make the contact with the stopper as slow as possible, that is, when the rubber leg 224 is extended, the problem arises that the vibration insulation performance during idling deteriorates due to the increase of the spring constant of the rubber leg 224.
That is, in this torque rod, the vibration isolation during idling and the prevention of roaring noise during acceleration are in conflict with each other.

  As a solution to this problem, as shown in FIG. 10 (B), the outer cylinder 218 is recessed in the direction away from the intermediate plate 230, and the rubber stopper 232 is raised from the recessed bottom, thereby It is conceivable to increase the stopper clearance, that is, the clearance between the intermediate plate 230 and the rubber stopper portion 232 and the protruding height of the rubber stopper portion 232.

  In this case, the stopper contact can be slowed by increasing the stopper clearance while keeping the spring constant of the rubber leg 224 low, and the stopper hits the stopper by the high protrusion height of the rubber stopper portion 232. The initial spring constant can be lowered, and it is possible to simultaneously improve the characteristics of both good vibration isolation during idling and reduction of the beat sound after hitting the stopper.

On the other hand, however, in this case, the size of the bush 219 in the left-right direction in the drawing increases, and as a result, the entire torque rod increases.
In this case, if a sufficient space cannot be secured as a mounting space, it is difficult to mount the torque rod.

JP-A-57-191129 Japanese Patent Laid-Open No. 6-109075

  With this background, the present invention provides a torque rod that can satisfactorily achieve both vibration isolation and idling reduction during idling, and that does not increase in length in the longitudinal direction. It was made for the purpose of doing.

Thus, according to the first aspect of the present invention, there is provided a first bush and a large size comprising a small size small bush at both ends respectively provided with a rigid outer cylinder and an inner cylinder and a rubber elastic body interposed therebetween. A second bush consisting of a large bush and a rigid connecting portion for connecting the first bush and the second bush. The second bush is connected to the engine side and the body side of the vehicle and receives torque from the engine, in the torque rod for regulating the roll direction of displacement of the engine, before Symbol second bushing, the rigidity and the ring-shaped intermediate plate is provided so as to surround the inner cylinder, before for intermediate plate, after A straight portion is provided at a position, and a stopper action is provided by directly or indirectly abutting the intermediate plate that is displaced in a direction approaching relatively to the inside of the straight portion and the outer cylinder side during acceleration. Go A stopper portion, and the second rubber stopper which forms a contact with the stopper acts directly or indirectly on the rubber legs of the rubber elastic body is displaced in a direction relatively close are provided in parallel at the time of acceleration, the The rubber elastic body has a pair of rubber legs that are expanded in a V shape from the inner cylinder, and the second rubber stopper portion is located in the center where the first rubber stopper portion faces the intermediate plate. Are arranged on both sides of the central first rubber stopper portion facing each of the pair of rubber legs, and when accelerating, the second rubber stopper portion first comes into contact with the rubber legs, and further displacement occurs. Next, the first rubber stopper portion comes into contact with the intermediate plate .

Of those claims 2, Oite to claim 1, said first bush is the engine side, the second bushing is characterized in that it is arranged on the body side.

Effects and effects of the invention

As described above, according to the present invention, the first rubber stopper portion that contacts the intermediate plate during acceleration and forms a stopper action at the inside of the straight portion and on the outer cylinder side, and the stopper action by contacting the rubber leg of the rubber elastic body. A second rubber stopper portion formed in parallel is provided.
That is, in the present invention, two types of rubber stopper portions, that is, a first rubber stopper portion that abuts against the intermediate plate and a second rubber stopper portion that abuts against the rubber leg are provided as rubber stopper portions, and each of them is assigned a role. It has been done.

Here, the stopper action by the second rubber stopper is a stopper action by contact with the rubber leg, that is, contact between rubber and rubber, so that the stopper contact is soft and the spring constant after contact with the stopper can be kept low.
On the other hand, since the first rubber stopper portion comes into contact with the rigid intermediate plate and acts as a stopper, the stopper contact is relatively hard and the spring constant after contact with the stopper is hard.

In the present invention, at the time of acceleration, the second rubber stopper portion is first brought into contact with the rubber leg, and when the displacement is further increased, the first rubber stopper portion is brought into contact with the intermediate plate .
Their to By doing so, to lower the spring constant of the rubber elastic body or rubber feet while causing satisfactorily perform vibration isolation during idling, at the time of acceleration is intermediate the stopper function of the second rubber stopper The time when the plate hits the first rubber stopper portion can be delayed, and thus the roaring sound in the vehicle compartment can be reduced satisfactorily.
On the other hand, when the rubber elastic body is largely displaced, the excessive displacement can be well regulated by the contact action of the first rubber stopper portion to the intermediate plate, that is, the stopper action.

In the present invention , the first bush is a small bush, the second bush is a large bush, and the rubber elastic body in the second bush has a pair of rubber legs that are expanded from the inner cylinder into a V shape. None, and the first rubber stopper portion is disposed at the center facing the intermediate plate, and the second rubber stopper portion is disposed at both sides of the central first rubber stopper portion at a position facing each of the pair of rubber legs. Keep it .

In the torque rod of the present invention , the first bush can be disposed on the engine side and the second bush can be disposed on the body side (Claim 2 ).

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, 10 is a suspension member (body) of a vehicle, and 12 is an engine elastically supported on the suspension member 10 via a left engine mount 14 and a right engine mount 16.
However, the engine mounts 14 and 16 support the weight of the entire power unit 20 formed by assembling the engine 12 and the transmission 18.

Reference numeral 22 denotes a torque rod interposed between the center frame 24 of the suspension member 10 and the lower part of the engine 12, and includes a first bush 26 made of a small bush, a second bush 28 made of a large bush, and these in the front-rear direction. It consists of a connecting part 30 to be connected.
The torque rod 22 is elastically coupled to the engine 12 on the first bushing 26 side, and is elastically coupled to the center frame 24 of the suspension member 10 on the second bushing 28.

  Here, an inner cylinder 34 (to be described later) is fixed to the engine 12 on the first bush 26 side, and an inner cylinder 42 is fastened and fixed to the center frame 24 of the suspension member 10 with bolts and nuts on the second bush 28 side.

The configuration of the torque rod 22 is specifically shown in FIGS.
First, in FIG. 3 and FIG. 4, the first bush 26 made of a small bush has a metal-made rigid outer cylinder 32 and inner cylinder 34, and a cylindrical rubber elastic body 36 between them, It is fixed integrally by vulcanization adhesion.
The first bush 26 is formed with a semicircular shape on the outer peripheral side thereof.

On the other hand, as shown also in FIG. 5, the second bush 28 made of a large bush is also made of a metal and rigid outer cylinder 40 and inner cylinder 42, and a rubber elastic body 44 fixed to them integrally by vulcanization adhesion. have.
However, on the second bush 28 side, the rubber elastic body 44 has a form having a pair of elastic legs 46 that are expanded from the inner cylinder 42 into a V shape.

On the second bush 28 side, a metal rigid and ring-shaped intermediate plate 48 is disposed so as to surround the inner cylinder 42.
Straight portions 50 and 52 are provided at the front and rear positions of the intermediate plate 48, specifically, at the left and right positions in the drawing.

The intermediate plate 48 is formed as flat plate portions 54 and 56 in which a portion on the straight portion 50 side and a portion on the 52 side are parallel to each other. Further, in the present embodiment, the inside of the intermediate plate 48 is filled with rubber, and a portion between the inner cylinder 42 and the flat plate portion 56 and a portion between the inner cylinder 42 and the flat plate portion 54 are respectively auxiliary. The stopper portions 58 and 60 are provided.
A space portion 62 is partially provided inside the intermediate plate 48. This void portion 62 has the following meaning.

That is, if the entire inner side of the intermediate plate 48 is filled with rubber, a tensile force acts on the adhesive interface during shrinkage after vulcanization, and the tensile force tends to cause peeling at the adhesive interface or cracks in the rubber. Become.
Therefore, by providing the void portion 62, deformation of the rubber inside the intermediate plate 48 is allowed at the time of shrinkage after vulcanization, thereby suppressing or preventing the tensile force from acting on the adhesion interface or the like.

  Between the flat plate portion 54 and the outer cylinder 40 on the left side of the intermediate plate 48 in the drawing, rubber stopper portions 63 and 64 that function as a stopper during deceleration are provided. In the middle, a rubber stopper portion is provided which serves as a stopper during acceleration.

  In the present embodiment, the first rubber stopper portion 66 located at the center is opposed to the flat plate portion 56 of the intermediate plate 48 as the rubber stopper portion, and the first rubber legs 46 located on both sides thereof are opposed to the pair of elastic legs 46. Two rubber stopper portions 68 are provided inside the straight portion 52.

In this embodiment, the first rubber stopper portion 66 and the second rubber stopper portion 68 are each formed in a cross-sectional mountain shape with substantially the same protruding height.
Also on the large bush 28 side, a hook-like portion 70 is formed in a semicircular shape on the outer peripheral side of the outer cylinder 40.

As shown in FIG. 4, the connecting portion 30 includes a pair of metal rigid plate-like portions 72 and 72 arranged at intervals, and a buried rubber 74 filled in a gap S therebetween. Consists of.
Here, the pair of plate-like portions 72 and the embedded rubber 74 are integrally fixed by vulcanization adhesion.

The outer surfaces of the pair of plate-like portions 72 are covered with a thin coating rubber 76. This also applies to the first bush 26 and the second bush 28.
That is, the outer surfaces of the outer cylinder 32 and the flange-shaped portion 38 in the first bush 26 are covered with the covering rubber 76, and the outer surfaces of the outer cylinder 40 and the flange-shaped portion 70 in the second bush 28 are covered with the covering rubber 76, respectively. ing.

The connecting portion 30, and hence the plate-like portion 72, is formed with an opening 78 having a long hole shape in the longitudinal direction as shown in FIGS.
The inner surface of the opening 78 of the plate-like portion 72 is also covered with a covering rubber 76.

In the present embodiment, the metal portion (excluding the inner cylinders 34 and 42) in the torque rod 22 is composed of a pair of metal plates 80-1 and 80-2 shown in FIG.
That is, the outer cylinder 32 and the bowl-shaped part 38 in the first bush 26, the outer cylinder 40 and the bowl-shaped part 70 in the second bush 28, and the pair of plate-like parts 72 in the connecting part 30 are the pair of metal plates 80-1. , 80-2.

  Specifically, the outer cylinder 32 in the first bush 26 includes a pair of halves 32-1 and 32-2, and the outer cylinder 40 in the second bush 28 also has a cylindrical shape. It consists of a pair of halves 40-1 and 40-2, and the half part 32-1 in the first bush 26, the half part 40-1 in the second bush 28 and one plate-like part 72 in the connecting part 30. However, it is integrally configured by the metal plate 80-1 in FIG.

Further, the half portion 32-2 in the first bush 26, the half portion 40-2 in the second bush 28, and the other plate-like portion 72 in the connecting portion 30 are integrally configured by a metal plate 80-2 in FIG. Yes.
In addition, each hook-shaped part 38 and 70 in the 1st bush 26 and the 2nd bush 28 also consists of each half part, and these are comprised integrally by the metal plates 80-1 and 80-2.

Here, the pair of metal plates 80-1 and 80-2 has a vertically symmetrical shape in FIG.
That is, the metal plates 80-1 and 80-2 are both made of the same member, and are arranged upside down.

In this embodiment, as shown in FIGS. 6 and 7, each of the metal plates 80-1 and 80-2 is provided with ribs 82 projecting from the plate surface by small dimensions, and these ribs 82 are attached to each other. In this state, rubber is integrally vulcanized and bonded to the metal plates 80-1 and 80-2.
The gap S formed between the plate-like portions 72 and 72 in the metal plates 80-1 and 80-2 is filled with rubber, and a buried rubber 74 is formed.

In this embodiment, as clearly shown in FIGS. 2 and 3, a circular hole 84 is partially formed in the covering rubber 76. Further, a crescent-shaped hole 86 is formed along the outer periphery.
These holes 84 and 86 are formed by pins provided in the vulcanization mold during rubber vulcanization molding.

That is, in this embodiment, the rubber material is injected and the whole is integrally vulcanized and molded with the pair of metal plates 80-1 and 80-2 set in the vulcanization mold. If the plates 80-1 and 80-2 are lifted, the product cannot be vulcanized well. Therefore, the pair of metal plates 80-1 and 80-2 are pressed against each other by pins provided on the vulcanization mold, and rubber is injected in this state to vulcanize and form.
The holes 84 and 86 are formed by pins provided in the vulcanization mold at that time. That is, by forming such holes 84 and 86, rubber can be vulcanized and molded while the pair of metal plates 80-1 and 80-2 are held in a superposed state.

Next, the operation of the torque rod 22 of this embodiment will be described.
In the torque rod 22 of the present embodiment, the rubber elastic body 44 is elastic in the stopper clearance between the intermediate plate 48 and the first rubber stopper portion 66 and between the rubber leg 46 and the second rubber stopper portion 68 during idling. Deformation and vibration isolation between the engine side and the body side.

  On the other hand, when the intermediate plate 48 is displaced relative to the outer cylinder 40 in the right direction in the drawing with the elastic deformation of the rubber elastic body 44 at the time of acceleration, first, as shown in FIG. The stopper portion 68 abuts on the rubber elastic body 44, specifically, the pair of elastic legs 46, and performs a stopper action.

  Further, when the intermediate plate 48 is displaced further in the approaching direction from this state, the central first rubber stopper 66 abuts against the intermediate plate 56 at that time to perform a stopper action, and an excessive displacement of the intermediate plate 48 is caused by the stopper. Regulate by action.

  As described above, in the present embodiment, there are provided two types of stopper portions, the first rubber stopper portion 66 that abuts the rubber stopper portion against the intermediate plate 48 and the second rubber stopper portion 68 that abuts against the rubber leg 46, respectively. To share roles.

Here, since the stopper action by the second rubber stopper 68 is a stopper action by contact with the rubber leg 46, that is, contact between rubber and rubber, the stopper contact is soft and the spring constant after contact with the stopper can be kept low.
On the other hand, since the first rubber stopper portion 66 abuts against the rigid intermediate plate 48 and performs a stopper action, the displacement after hitting the stopper can be greatly restricted.

According to the present embodiment, the elastic constant of the rubber elastic body 36, that is, the rubber leg 46, is lowered so that vibration isolation during idling can be satisfactorily performed, while the stopper action of the second rubber stopper portion 68 during acceleration. As a result, the timing when the intermediate plate 48 hits the first rubber stopper portion 66 can be delayed, whereby the roaring noise in the passenger compartment can be reduced satisfactorily.
On the other hand, when the rubber elastic body 44 is largely displaced, the excessive displacement can be well regulated by the contact action of the first rubber stopper 66 to the intermediate plate 48, that is, the stopper action.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

It is a figure which shows the torque rod of one Embodiment of this invention with an engine and a suspension member. It is a perspective view of the torque rod of the embodiment. It is a plane sectional view of the torque rod of the embodiment. It is side surface sectional drawing of the torque rod of the same embodiment. It is a plane sectional view of the 2nd bush in the torque rod of the embodiment. It is a figure which decomposes | disassembles and shows the metal plate which comprises the metal part of the embodiment with an inner cylinder. It is a top view of the metal plate of FIG. It is operation | movement explanatory drawing of the torque rod of the embodiment. It is a figure which shows an example of a conventionally well-known torque rod. It is a comparative example figure of this invention.

Explanation of symbols

22 Torque rod 26 First bush 28 Second bush 30 Connecting portion 32, 40 Outer tube 34, 42 Inner tube 36, 44 Rubber elastic body 46 Rubber leg 48 Intermediate plate 50, 52 Straight portion 66 First rubber stopper portion 68 Second Rubber stopper

Claims (2)

A first bush consisting of a small small bush at both ends and a second bush consisting of a large large bush , each comprising a rigid outer cylinder and an inner cylinder, and a rubber elastic body interposed therebetween, Torque that has a rigid connecting portion that connects the first bush and the second bush, is connected to the engine side and the body side of the vehicle, receives torque from the engine, and regulates displacement in the roll direction of the engine In the rod
The front Stories second bushing, the rigidity and the ring-shaped intermediate plate is provided so as to surround the inner cylinder, before for intermediate plates, have hollow portions are provided in the rear position, the hollow portion A first rubber stopper portion that directly or indirectly abuts against the intermediate plate, which is displaced in a direction relatively approaching at the time of acceleration, inside the outer cylinder, and a direction of relatively approaching at the time of acceleration A second rubber stopper portion that is directly or indirectly brought into contact with a rubber leg of the rubber elastic body that is displaced to form a stopper and is provided in parallel .
The rubber elastic body has a pair of the rubber legs that are expanded in a V shape from the inner cylinder, and the second rubber stopper is located in the center where the first rubber stopper portion faces the intermediate plate. Portions are arranged on both sides of the central first rubber stopper portion, facing each of the pair of rubber legs,
The torque rod is characterized in that the second rubber stopper portion first contacts the rubber leg during acceleration, and the first rubber stopper portion contacts the intermediate plate next with further displacement. . Oite to claim 1, wherein the first bushing the engine side, the torque rod and the second bushing is characterized in that it is arranged on the body side.

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