JPH11321260A - Suspension rod - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a suspension rod that can be assembled even if a suspen sion device is not in a neutral position when fastened to a fitted mating part. SOLUTION: In a suspension torque rod 40 formed to fasten a rubber bush part 41 provided at the end, to a bracket 29 by a bolt 50, the rubber bush part 41 has an outer cylinder 46 provided at the end of a rod body 45; rubber 47 fixed to the inside of the outer cylinder 46; and a boss part 48 fixed to the inside of the rubber 47 and protrusively provided with a lug part 49 in an opposed position to the bracket 29. The lug part 49 has a bolt through hole 51 formed to insert the bolt 50 through. The bolt through hole 51 has a first part 51a positioned on the insertion front side of the bolt 50, and a second part 51b positioned on the insertion inner side of the bolt 50. The vertical dimension of the second part 51b is larger than that of the first part 51a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a suspension rod such as a torque rod having a rubber bushing at an end.

[0002]

2. Description of the Related Art An air suspension device preferably used for vehicles such as passenger cars and trucks is disclosed in Japanese Utility Model Laid-Open Publication No. 3-78614 and Japanese Patent Laid-Open Publication No. 9-99720. The vehicle includes an air spring disposed on the frame, a torque rod for supporting a longitudinal load input to the axle, and the like.

When a torque rod is fastened to a bracket on the frame side or axle side, the torque rod is fastened to the bracket via a rubber bush provided at an end of the torque rod. Torque rod 1 shown in FIG.
The rubber bush portion 101 is provided with an outer cylinder 103 provided at the end of the rod body 102, a rubber 104 fixed inside the outer cylinder 103 by vulcanization bonding or the like, and a vulcanization bonding etc. inside the rubber 104. Boss part 1 fixed by
05. Ear portions 111 are provided on both sides of the boss portion 105 so as to protrude at positions facing the bracket 110 as the attachment partner. Bracket 110 and ear 11
1 is provided with a bolt through hole 113 for inserting a fastening bolt 112 and a bolt receiving hole 114. The ear 112 is fastened to the bracket 110 by screwing the bolt 112 into a nut 115 and tightening. doing.

[0004] The thus constructed torque rod 100
Is connected at one end to a bracket on the vehicle body via the rubber bush portion 101, and the other end of the torque rod 100 is also connected to the bracket at the axle side via the rubber bush portion. And this kind of suspension device,
The stroke extends from a state where the distance between the vehicle body and the axle is minimum (a so-called bump state) to a state where the distance between the vehicle body and the axle is a maximum (a so-called rebound state) from a neutral position in the vertical direction. Therefore, as the distance between the vehicle body and the axle changes in accordance with the unevenness of the road surface while the vehicle is running, the torque rod 100 swings up and down, and at this time, the outer cylinder 103 and the boss 105 are relatively moved. Will rotate.

[0005] The rubber 104 comprises an outer cylinder 103 and a boss 105.
Are fixed to both the outer cylinder 103 and the boss 10.
When 5 rotates relatively, torsion in the direction of arrow R acts on rubber 104. The rubber 104 has the durability to withstand a repetition of 1,000,000 times or more when the deflection angle when twisted is within 10 °, but the durability greatly increases when the deflection angle exceeds the allowable angle (10 °). Is known to decrease. Therefore, the rubber 104 needs to be press-fitted and fixed to the outer cylinder 103 in association with the swing angle of the torque rod 100 so that the deflection angle does not exceed the allowable angle.

That is, the outer cylinder 103 and the boss 105 are formed so that the rubber 104 is in a neutral state with zero torsion (zero deflection angle) when the suspension device is in the neutral position.
If the torque rod 100 swings in the range from the bump state to the rebound state, the rubber rod 10
Can be kept within the allowable angle, and a predetermined torsional durability can be exhibited. From such a point of view, the boss 105 is provided so that the torsion of the rubber 104 is reduced to zero when the suspension device is in the neutral position.
3, and the relative position was set.

[0007]

SUMMARY OF THE INVENTION The torque rod 10
In a suspension device such as a truck having 0,
When assembling the suspension device to the body frame,
As shown in FIG. 13, the torque rod 100 is assembled while the frame 120 is turned upside down.

At the time of assembly, the axle 122 is in the lowest state (bump state) because the air spring 121 is in a non-operating state. Therefore, the torque rod 1
12 is in a state of being rotated down, and the mounting surface 110a of the bracket 110 on the axle side as the mounting mating portion (FIG. 12).
) And the mounting surface 111a of the ear 111 of the boss 105.
Are not parallel, and an angle α exceeding 6-7 ° is formed.

In the case of a trunnion type suspension device using a leaf spring instead of the air spring 121, the leaf spring warps almost to a rebound state when the suspension device is assembled with the frame turned upside down. As a result, the axle is pushed up, so that the torque rod 100 is turned up as shown by the imaginary line F in FIG.
For this reason, the bracket 1 on the axle side
The mounting surface 110a of the base 10 and the mounting surface 111a of the ear 111 of the boss 105 are not parallel to each other but are angled.

When the angle α is formed between the mounting surfaces 110a and 111a, the bolt hole 1
Since the bolt 13 and the bolt receiving hole 114 of the bracket 110 are not aligned in a straight line, the bolt 112 cannot be passed through the bolt receiving hole 114.

Therefore, conventionally, as shown in FIG. 14, the bolt 112 is inserted into the bolt through hole 113 and the bolt receiving hole 114 while the axle 122 is held at the suspension neutral position by some holding means P. Was. For this reason, conventionally, there has been a problem that extra equipment and labor are required for assembling the suspension device.

Accordingly, an object of the present invention is to provide a bolt receiving hole in a bolt receiving hole when a rod such as a torque rod is fastened to a mounting member such as a bracket on the vehicle body or an axle side without holding a suspension at a neutral position. An object of the present invention is to provide a suspension rod that can be passed through without any trouble and can perform an assembling operation efficiently.

[0013]

The rubber bush portion of the suspension rod according to the present invention, which has been developed to achieve the above object, has an outer cylinder provided at an end of the rod body and an outer cylinder. A boss provided inside the cylinder and having a lug protruding at a position facing the attachment partner, and a rubber press-fitted between the outer cylinder and the boss and fixed to both the outer cylinder and the boss. The ear portion is formed with a bolt through hole through which a bolt is inserted in a direction along the rod body. The bolt through hole has a first portion located on the near side of the bolt insertion, and a bolt through hole. A second part located on the insertion back side,
The vertical dimension of the second portion is made larger than the vertical size of the first portion of the bolt passage hole, so that the bolt can be tilted in the vertical direction.

When the suspension rod is mounted on a frame of a vehicle body, the bolt can be tilted up and down even if the bolt through hole in the ear and the bolt receiving hole in the bracket are not straight but angled. Accordingly, the bracket can be inserted into the bolt receiving hole.

[0015] By setting the dimensional relationship between the first portion and the second portion of the bolt through hole as described in claim 2, a bolt inclination angle of 6.5 ° or more is ensured. Even when the suspension device is in the dump state or the rebound state at the time of attachment, the bolt can be tilted to an angle at which the bolt can be inserted into the bolt through hole of the bracket.

The rubber rod portion of the suspension rod according to the third aspect also has a bolt through hole formed in the lug portion, and the inside diameter of the first portion of the bolt through hole increases toward the bolt insertion opening. A spherical or mortar-shaped bolt receiving surface is formed so that the bolt can be tilted in the vertical direction, and the bolt has a convex shape corresponding to the bolt receiving surface and makes surface contact with the bolt receiving surface. Is provided.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 6 and 7
As shown in FIG. 1, for example, a vehicle body 10 used for a large truck or the like has a pair of right and left frames 11, 1 extending in the front-rear direction.
2 is provided. The body 1 is located below the frames 11 and 12.
Axle 1 along width direction 0 (hereinafter referred to as vehicle width direction)
3 are provided. Wheels 1 on both ends of axle 13
4, 15 are provided.

The axle 13 is supported on the frames 11 and 12 by an air suspension device 20 located on one wheel 14 side and an air suspension device 21 located on the other wheel 15 side. In the center of the axle 13 is a gear box 22 for the differential. The left and right air suspension devices 20 and 21 have substantially the same configuration except that they are symmetrical to each other. Therefore, one air suspension device 20 will be described below as a representative.

This air suspension device 20 is shown in FIG.
As shown in FIG. 1, a pair of front and rear air springs 25 and 26 are provided directly below the frame 11. On the lower surface of the frame 11 in front of the front air spring 25, a bracket 28 that functions as a mounting partner of the torque rod 40 described below is provided. A bracket 29 that functions as a mounting partner of the torque rod 40 is also provided on the lower surface side of the axle 13. These brackets 28, 29 extend downward.

A front air spring 25 and a rear air spring 26
, A support beam 30 made of a leaf spring is stretched. The front end 32 of the support beam 30
It is fastened to the lower surface of the front air spring 25. The rear end 33 of the support beam 30 is fastened to the lower surface of the rear air spring 26. The intermediate portion in the longitudinal direction of the support beam 30 is fixed to the axle 1 by a fixing member 35 such as a U-bolt.
3 A shock absorber 36 is provided between the frame 11 and the axle 13. The left and right air suspension devices 20, 21 are connected to each other by a stabilizer 37 for increasing the roll rigidity of the vehicle body.

The vertical load applied to the vehicle body 10 having the air suspension devices 20 and 21 is applied to the air spring 2.
It is supported by the support beam 30 via 5, 26. When the vehicle body 10 moves up and down due to unevenness of the road surface while the vehicle is running, mainly the air springs 25 and 26 absorb the vibration in the up and down direction, so that the transmission of the vibration to the frames 11 and 12 is suppressed. You. Further, the rebound of the vertical vibration is suppressed by the damping action of the shock absorber 36.

A torque rod 40 functioning as a lower torque rod is provided directly below the frame 11.
The torque rod 40 extends in the front-rear direction along the frame 11. The rear end side of the torque rod 40 is connected to the bracket 29 on the axle 13 side via the rubber bush part 41.
It is connected to. The front end side of the torque rod 40 is connected to the bracket 28 on the frame 11 side via a rubber bush part 42.
Linked to These front and rear rubber bush portions 41, 42
Since the configuration and operation are substantially common to each other, one rubber bush portion 41 will be described below as a representative.

The rubber bush 41 is configured as shown in FIGS. That is, the rubber bush part 4
Reference numeral 1 denotes an outer cylinder 46 provided at the end of a rod body 45 of the torque rod 40, a rubber 47 fixed to the inside of the outer cylinder 46 by vulcanization bonding or the like, and fixed to the inside of the rubber 47 by vulcanization bonding or the like. Boss portion 48 made of metal. As shown in FIG. 4, ear portions 49 are provided on both left and right side surfaces of the boss portion 48 at positions facing the mounting surface 29 a of the bracket 29. Bolt through holes 51 for inserting fastening bolts 50 are formed in the ears 49. The bolt hole 51 extends in a direction along the rod body 45. The bracket 29 has a bolt receiving hole 52 for receiving the bolt 50.

As shown in FIG. 3, the bolt hole 51 of the ear portion 49 has a first portion 51a located on the near side of the bolt 50 insertion and a second portion 51b located on the back side of the bolt 50 insertion. And the vertical dimension D of the second part 51b is made larger than the vertical dimension d of the first part 51a. Thus, by making the hole diameter D of the second portion 51b of the bolt through hole 51 sufficiently larger than the outer diameter of the shaft portion 50a of the bolt 50, the bolt 50 is vertically angled ± θ from the neutral position N. It becomes possible to incline to a corresponding angle. The angle θ is set to a value larger than the angle α (shown in FIG. 1) between the mounting surface 29a of the bracket 29 and the mounting surface 49a of the ear 49 before fastening.

Specifically, the inner diameter of the first portion 51a is defined as d
(Mm), the distance of the first portion 51a in the axial direction is L1.
(Mm), the inner diameter of the second portion 51b is D (mm), the total length of the bolt through hole 51 is L2 (mm), and the bolt shaft 50
When the outer diameter of a is D-1 (mm), Dd ≧ 4, L2 /
d ≦ 1.47 and L1 / L2 is 0.1 to 0.25
Up to the range. When L1 / L2 is less than 0.1, the thickness of the first portion 51a becomes too thin, so that a sufficient fastening surface pressure cannot be obtained. L1 / L2 is 0.2
If it exceeds 5, the bolts 5 required when assembling the suspension
The vertical inclination angle θ of 0 (6.5 ° or more) cannot be secured. Note that the second portion 51b may be a vertically long slot.

The suspension device 20 of this embodiment
When assembling the frame 21 to the frame 11, the frame 11 is turned upside down in the same manner as the conventional frame 120 shown in FIG. Then, after the bolt 50 is inserted into the bolt through hole 51 of the ear 49 and the bolt receiving hole 52 of the bracket 29, a nut 55 is screwed into the bolt 50 and tightened.
Are fastened to each other.

In this assembling operation, when the bolt 50 is inserted into the receiving hole 52, as shown in FIG. 1, even if the mounting surfaces 29a and 49a are not parallel and have an angle α, the bolt 50 is As described above, the neutral position N (FIG. 3)
), And an angle θ of more than 6.5 ° in the vertical direction (θ
> Α), the bolt 50 can be passed through the receiving hole 52. The inner diameter d of the first portion 51a of the bolt through hole 51 is slightly larger (for example, about 1 mm) than the shaft portion 50a of the bolt 50, and the value of L1 / L2 is set to 0.1 or more. , The fastening surface pressure between the bolt 50 and the nut 55 is sufficiently ensured. When the nut 55 is tightened in this way, as shown in FIG.
The mounting surface 49a of the ear part 49 is the mounting surface 29 of the bracket 29.
Since the boss portion 48 rotates in the direction of the arrow r to a position where the rubber 47 contacts the surface 47a, the fastening is completed with the rubber 47 being twisted by an angle corresponding to the angle α. The twist of the rubber 47 is eliminated when the suspension device is in the neutral position.

A V rod 70 functioning as an upper torque rod is mounted above the axle 13.
In the illustrated V-rod 70, the front end divided in the left-right direction has a frame 1 via rubber bush portions 71 and 72, respectively.
It is connected to the V rod brackets 73 and 74 of the first and second V rods. The rear end of the V-rod 70 is fastened to a center bracket 79 on the axle 13 side via a rubber bush 78.

The V rod 70 and the torque rod 40
Thereby, the input load in the front-rear direction is supported by the frames 11 and 12. Rubber bush portions 71, 72 of the V rod 70,
Since the configuration and operation of 78 are substantially the same as those of the rubber bush portion 41, description thereof is omitted.

As in the second embodiment shown in FIG. 8, a bolt through hole 51 formed in a rectangular hollow ear portion 49 has a first portion 51a and a second portion 51b similar to those of the above embodiment.
Is provided and the vertical dimension D of the second portion 51b is made larger than the vertical size d of the first portion 51a, whereby the same effect as in the first embodiment can be obtained.

The bolt through hole 51 of the rubber bush portion 41 of the third embodiment shown in FIGS. 9 and 10 has a first portion 51 c located on the near side of the bolt 50 insertion and a back portion of the bolt 50 insertion. A second portion 51d is located, and the vertical dimension of the first portion 51c is larger than the vertical size of the second portion 51d, and the first portion 51c has an insertion opening for the bolt 50. By forming a spherical bolt receiving surface 90 whose inner diameter increases toward 51e, the bolt 50
Can be tilted to the angle θ from the neutral position N. The bolt 50 has a bolt receiving surface 90.
And a spherical inclined portion 91 capable of making surface contact with the bolt receiving surface 90 in a convex shape corresponding to the above.

In the third embodiment, as shown in FIG. 10, the shaft 50a of the bolt 50 is
By passing the nut 1 through the bolt receiving hole 52 of the bracket 29 and screwing the nut 55 onto the bolt 50 and tightening, the spherical bolt receiving surface 90 and the inclined portion 91 come into surface contact with each other while fitting together, and the ear portion 49 is brought into contact. Bracket 29
Is concluded. In this case, since the bolt receiving surface 90 and the inclined portion 91 are in surface contact with each other in a large area, the bolt 5
The surface pressure due to the fastening of the nut 55 and the nut 0 is sufficiently ensured.

The fourth embodiment shown in FIG.
A mortar-shaped bolt receiving surface 90 is formed, and a truncated cone-shaped inclined portion 91 is formed in the bolt 50 so that the bolt receiving surface 90 and the inclined portion 91 are brought into surface contact at the time of fastening. The other configurations and operations are the same as those of the third embodiment, and thus the description is omitted.

[0034]

According to the suspension rod of the present invention, when the rod such as the torque rod is fastened to the mounting counterpart such as the bracket on the vehicle body or the axle side, the suspension device is in the neutral position. Even if the bolt is not held, the bolt can be inserted into the bolt receiving hole without any problem, so that the assembling operation can be performed efficiently.

In the rubber bush portion according to the second aspect, even if the suspension device is in the dumping state or the rebounding state when the rod is assembled, the inclination angle required for inserting the bolt is 6.5 ° or more. Can be secured.

In the suspension rod according to the third aspect, the bolt can be inserted into the bolt receiving hole without any problem without holding the suspension device at the neutral position, and is provided at the first portion of the bolt through hole. Since the spherical or mortar-shaped bolt receiving surface and the inclined portion of the bolt are in surface contact with each other over a wide area, a more sufficient fastening surface pressure can be obtained.

[Brief description of the drawings]

FIG. 1 is a side view of a suspension rod according to a first embodiment of the present invention, in which a rubber bush portion is separated from a bracket.

FIG. 2 is a perspective view of a rubber bush portion of the rod shown in FIG.

FIG. 3 is a side view showing a part of the rubber bush shown in FIG. 1 in cross section.

FIG. 4 is a sectional view of the rubber bushing taken along the line IV-IV in FIG. 3;

FIG. 5 is a side view showing a state in which the rubber bush portion shown in FIG. 1 is fastened to a bracket in a partial cross section.

FIG. 6 is a side view of a part of the vehicle including the suspension rod shown in FIG. 1;

FIG. 7 is a bottom view of a part of the vehicle shown in FIG. 6;

FIG. 8 is a side view showing a cross section of a part of a rubber bush portion of a rod according to a second embodiment of the present invention.

FIG. 9 is a side view showing a cross section of a part of a rubber bush portion of a rod according to a third embodiment of the present invention.

FIG. 10 is a side view showing a state in which the rubber bush portion shown in FIG. 9 is fastened to a bracket in a partial cross section.

FIG. 11 is a side view showing a cross section of a part of a rubber bush portion of a rod according to a fourth embodiment of the present invention.

FIG. 12 is a side view showing a state in which a rubber bush portion of a conventional suspension rod is separated from a bracket.

FIG. 13 is a side view showing a state where a conventional suspension rod is assembled to a frame.

FIG. 14 is a side view of a state where the suspension device shown in FIG. 13 is raised to a neutral position.

[Explanation of symbols]

 11, 12 ... Frame 13 ... Axle 20, 21 ... Air suspension device 28, 29 ... Bracket (attachment part) 40 ... Torque rod 41, 42 ... Rubber bush part 45 ... Rod body 46 ... Outer cylinder 47 ... Rubber 48 ... Boss Part 49 ... Ear part 50 ... Bolt 51 ... Bolt through hole 51a ... First part 51b ... Second part 51c ... First part 51d ... Second part 52 ... Bolt receiving hole 90 ... Bolt receiving surface 91 ... Inclination Department

Claims (3)

[Claims] 1. A suspension rod in which a rubber bush portion provided at an end portion is fastened to a mounting counterpart by a bolt, the rubber bush portion comprising: an outer cylinder provided at an end portion of a rod body; A boss part provided inside the outer cylinder and having a lug protruding at a position facing the attachment counterpart; and both the outer cylinder and the boss part being press-fitted between the outer cylinder and the boss part. The ear portion is formed with a bolt through hole through which the bolt is inserted. The bolt through hole has a first portion located on the near side of inserting the bolt, and a bolt. A second portion located on the back side of insertion of the bolt through hole, by increasing the vertical dimension of the second portion compared to the vertical dimension of the first portion of the bolt through hole, Bolts can be tilted up and down Suspension rod according to claim and. 2. An internal diameter of a first portion of the bolt through hole is d.
(Mm), the axial distance of the first portion is L1 (m
m), the total length of the bolt through hole is L2 (mm), the inner diameter of the second portion is D (mm), and the outer diameter of the bolt shaft is D-1 (m
2. The suspension rod according to claim 1, wherein in the case of m), D-d ≧ 4, L2 / d ≦ 1.47, and L1 / L2 is in the range of 0.1 to 0.25. 3. A suspension rod in which a rubber bush portion provided at an end portion is fastened to a mounting counterpart by a bolt, wherein the rubber bush portion comprises: an outer cylinder provided at an end portion of a rod body; A boss part provided inside the outer cylinder and having a lug protruding at a position facing the attachment counterpart; and both the outer cylinder and the boss part being press-fitted between the outer cylinder and the boss part. The ear portion is formed with a bolt through hole through which the bolt is inserted. The bolt through hole has a first portion located on the near side of inserting the bolt, and a bolt. And a second portion located on the inner side of the bolt insertion hole, and a first portion of the bolt through hole is formed with a spherical or mortar-shaped bolt receiving surface whose inner diameter is widened toward the bolt insertion opening. If the bolt can be tilted up and down Rutotomoni, the bolt, the suspension rod, characterized in that forms a shape corresponding to the bolt bearing surface is provided an inclined portion capable of be in surface contact with the bolt receiving surface.