JP6189672B2 - Resin torque rod - Google Patents

Description

The present invention relates to a resin torque rod used to support an engine, and more particularly to an advantageously formed weld line.

A torque rod having a rod portion and first and second ring portions provided at both ends in the length direction, elastic bushes provided on each ring portion, and connecting each to an engine and a vehicle body is known. A resin torque rod in which the rod portion and the ring portion are integrally formed of a resin such as FRP is also known.
Furthermore, in the case of a resin torque rod, it is also known that a weld line is formed in the ring portion or the like.

JP 2004-255971 A

By the way, the weld line of the ring part is formed by the resin injected by injection or the like dividing the ring hole formed in the ring part in two directions and then joining. When the base part of the rod part of the ring part is the inner end part and the opposite side across the center of the ring part is the outer end part, if the resin is injected from the inner end part, the weld line is formed at the outer end part. Will be.
However, it is known that the weld line reduces the strength. If the weld line coincides with the load input direction (in this case, the outer edge), the weld line is located in a portion with high stress, and the ring portion is easily broken from the weld line. It will decline. Therefore, it is desirable to shift the position of the weld line from the load input direction even if the resin is injected from the inner end.
Therefore, the present application aims to realize such a demand.

In order to solve the above-mentioned problems, the invention described in claim 1 is characterized in that the ring portions (14, 16) are integrally formed at both ends in the length direction of the rod portion (12) , and one ring portion is formed at the center thereof. The first ring member (14) is connected to the engine via the first inner member (22) provided, and the other ring portion is the vehicle body via the second inner member (32) provided at the center thereof. In the resin torque rod as the second ring portion (16) connected to the
When viewed from the front, the first ring portion (14) is disposed on the center line (C0) connecting the centers of the first ring portion (14) and the second ring portion (16). The outer side on the opposite side across the center (O1) of the rear inner end (P1) and the first inner member (22) in the direction in which the first inner member (22) moves in accordance with the retreat. Provided with an end (P2), and further provided with an upper end (Q1) shifted by 90 ° upward from the inner end (P1) and the outer end (P2),
The rod part (12) is provided with a lightening hole (44) disposed asymmetrically in the vicinity of the first ring part (14) with respect to the center line (C0) upward.
By providing this hollow hole (44), the weld formed by shifting the resin flow during molding of the first ring portion from the center line (C0) by making the resin flow asymmetric with respect to the center line (C0). Providing a line (70) between the outer end (P2) and the upper end (Q1);
The said hollowing hole (44) comprises the guide part which guides the said 1st inner member (22) to the predetermined destruction plan part (45) at the time of a collision,
The planned destruction portion (45) is located behind the upper end (Q1) and above the inner end (P1),
The planned destruction portion (45) and the weld line (70) are located on opposite sides of the center (O1) .

According to a second aspect of the present invention, in the first aspect, the weld line (70) is formed at a position shifted by about 45 ° from the upper end (Q1) toward the outer end (P2). It is characterized by that.

According to a third aspect of the present invention, in the first aspect , the lightening holes (44) are arranged asymmetrically with respect to the center line (C0), and the lightening holes (44) sandwiching the centerline (C0) are arranged. Asymmetric cross-sectional area portions are formed on both sides.

A fourth aspect of the present invention is characterized in that, in the first aspect , the lightening hole (44) has an asymmetric shape with respect to the center line (C0).

Oite the invention the first aspect according to claim 5, the opening edge portion of the lightening hole (44), leading edge along the ring hole (15) formed on said first ring portion (14) A rear edge portion (44b) behind the front edge portion (44a), and the rear edge portion (44b) forms a guide slope that rises obliquely rearward .

The invention described in claim 6 is characterized in that, in the above-mentioned claim 1, the cross-sectional area of the ring portion (14) is asymmetric with respect to the center line (C0).

According to the first aspect, since the resin flow in the ring portion (14) is asymmetric with respect to the center line (C0), the weld line (70) can be formed shifted from the center line (C0). For this reason, stress concentration on the weld line (70) can be avoided, and the strength and durability can be improved.
Further, since the hollow hole (44) is provided in the vicinity of the ring portion (14) and an asymmetric resin flow is formed by the hollow hole forming portion, the weld line is formed by utilizing the formation of the hollow hole (44). (70) can be formed shifted from the center line (C0).
Further, a guide portion is provided with a lightening hole (44) that is provided inside the ring portion (14) and guides the first inner member (22) attached to the engine to a predetermined planned destruction portion (45) at the time of a collision. As a result, the first inner member (22) can be guided to the predetermined destruction planned portion (45) at the time of collision, and can be reliably broken, and a weld line is provided in association with the planned destruction portion. The weld line forming portion can be destroyed at the same time. Therefore, the ring portion can be reliably and accurately destroyed at the time of collision.

According to claim 2, the weld line (70) is formed at a position displaced from the center line (C0), that is, at a position displaced by about 45 ° from the upper end (Q1) to the outer end (P2). Even if a large stress is applied to the outer end portion (P2) of the first ring portion (14) in the direction of the center line (C0), the weld line (70) does not exist at this position. For this reason, since the weld line (70) having a low strength is located at a position away from the portion where the stress is highest, the torque rod (10) is hardly broken and has high durability.

According to the third aspect, since the lightening hole (44) is asymmetrically arranged so as to be offset from the center line (C0), it is asymmetrical on both sides of the lightening hole (44) sandwiching the centerline (C0). Can be formed. For this reason, the velocity of the resin flowing through the ring portion becomes asymmetric with respect to the center line (C0), and the weld line (70) can be formed shifted from the center line (C0). In addition, the position of the weld line (70) can be easily adjusted by adjusting the arrangement of the hollow holes (44).

According to claim 4, by forming the lightening hole (44) in an asymmetric shape with respect to the center line (C0), an asymmetric break is formed on both sides of the lightening hole (44) sandwiching the center line (C0). An area portion can be formed.

According to claim 5, the rear edge portion (44b) forms a guide slope that rises rearward, so that the first inner member (22) is guided by the rear edge portion (44b), moves rearward and rises, and is destroyed. The planned portion (45) can be broken.

According to the sixth aspect, since the cross-sectional area of the ring portion (14) is asymmetrical, a resin flow that is asymmetrical with respect to the center line (C0) is realized, and the weld line (70) is connected to the center line (C0). ). In addition, the position of the weld line (70) can be easily adjusted by adjusting the degree of asymmetry of the cross-sectional area.

Front view of torque rod Plan view 3-3 sectional view in FIG. Explanatory drawing about molding of the 1st ring part Explanatory drawing at the time of collision failure in the first ring part

Hereinafter, an embodiment will be described based on the drawings. 1 is a front view of the torque rod, FIG. 2 is a plan view, and FIG. 3 is a sectional view taken along line 3-3 in FIG.
The torque rod 10 includes a rod-shaped rod portion 12 and a main body portion 18 in which a first ring portion 14 and a second ring portion 16 are integrally formed with a known appropriate resin such as FRP at both longitudinal ends thereof.

The first ring portion 14 includes a ring hole 15 (see FIG. 3), and is connected to the first inner member 22 via a first elastic body 20 disposed inside the first ring portion 14. The first elastic body 20 is made of an appropriate elastic material such as rubber, and the first ring portion 14 and the first inner member 22 are elastically coupled by appropriate means such as vulcanization adhesion. The first inner member 22 is attached to an engine (not shown).

The second ring portion 16 includes a ring hole 17 (see FIG. 3), and is coupled to the second inner member 32 via a second elastic body 30 disposed on the inner side. The second elastic body 30 is made of an appropriate elastic material such as rubber, and elastically couples the second ring portion 16 and the second inner member 32 by appropriate means such as vulcanization adhesion.
The second inner member 32 is a pipe member made of metal or the like, and is attached to a vehicle body (not shown) by a bolt (not shown) passed through the second inner member 32.

Here, the center of the first ring portion 14 is O1, the center of the second ring portion 16 is O2, and a straight line connecting them is a center line C0. The central axis of the first ring portion 14 is C1, the width is W1, the central axis of the second ring portion 16 is C2, and the width is W2. The center axis C1 is also the axis of the first inner member 22, and the center O1 is in the middle of W1 on the center axis C1. The center axis C2 is also the axis of the second inner member 32, and the center O2 is in the middle of W2 on the center axis C2.
The central axes C1 and C2 are orthogonally twisted by 90 °. However, the torque rod that is the subject of the present invention is not limited to such a torsion type, and the center axes C1 and C2 may be parallel.

The center line C0 is orthogonal to these center axes C1 and C2. In this example, the rod portion 12 is provided symmetrically with respect to the center line C 0, and the center line C 0 is also the center line of the rod portion 12. Here, with respect to the first ring portion 14, of the portions on the center line C0, the portion serving as the root of the rod portion 12 is defined as the inner end portion P1, and the portion on the opposite side across the center O1 is defined as the outer end portion P2. And Moreover, the part which shifted | deviated 90 degrees from these is made into the upper side edge part Q1 and the lower side edge part Q2 (refer FIG. 1).

Furthermore, the direction of the center line C0 is the front-rear direction, the center axis is the direction of C2, and the left side in FIG. Further, the direction of the central axis C1 is the left-right direction, and the upper side in FIG. 2 is the right side. In this example, a weld line 70 is formed at a position P3 between the outer end P2 and the upper end Q1.

The first inner member 22 is made of a metal pipe or the like, and includes a flat portion 23 that is flattened by projecting from the first ring portion 14 on both sides in the length direction of the cylindrical portion that is fitted inside. A through hole 24 is formed in the through hole 24, and the through hole 24 is attached to the engine by a bolt or the like not shown. The surface of the flat portion 23 is inclined forward and downward.

A plurality of parallel thinning grooves 26 are formed in the circumferential direction on the outer peripheral surface of the first ring portion 14, and ribs 28 are formed between the thinning grooves 26. A plurality of ribs 28 are formed in parallel.

The rod portion 12 has a substantially H-shaped cross section integrally including a vertical rib 40 extending vertically and a columnar portion 42 that connects the vertical rib 40 and extends in the front-rear direction along the center line C0. In the vicinity of the base of the first ring portion 14 at the front end portion of the portion 42, a lightening hole 44 is formed penetrating in the left-right direction. The positions of the lightening holes 44 are asymmetric in the vertical direction and are formed so as to be offset upward. As will be described later, the lightening hole 44 forms a guide portion of the first inner member at the time of collision.

The plan view of the upper and lower ribs 40 forms a curved portion 46 whose middle in the front-rear direction is constricted toward the center. In addition, a plurality of lateral ribs 48 that protrude in the left-right direction and extend toward the second ring portion 16 in parallel with the center line C0 are integrally formed on the side surface of the columnar portion 42 in parallel.

The 2nd elastic body 30 has the arm part 34 extended from the 2nd inner member 32 to right and left, and has comprised the vibration-proof main part.
The arm portion 34 has a substantially V-shape convex forward in plan view and expands rearward, and the second inner member 32 faces the stopper 38 through a piercing hole 36 penetrating in the vertical direction. .
A straight hole 39 penetrating in the vertical direction is also formed on the front side of the arm portion 34.

Vibrations in the vertical and longitudinal directions of the engine are input to the first ring portion 14 via the first inner member 22 and elastically deform the first elastic body 20. At this time, since the first elastic body 20 is twisted and the torque rod 10 is swung around the first inner member 22, the second ring portion 16 moves in the front-rear direction to elastically deform the arm portion 34. Thus, vibration is absorbed by the torque rod 10 and vibration transmission to the vehicle body is reduced.

Next, formation of a weld line will be described. FIG. 4 is a view showing only the first ring portion 14 portion on the front half side of the mold 60, and the second ring portion 16 on the rear half side is also continuously formed by the mold 60, although omitted. The In this example, the mold 60 is formed for injection molding.
The mold 60 has a cavity that is a molding space. The cavity includes a ring molding part 62 that forms the first ring part 14 and a rod molding part 64 that forms the rod part 12.
A ring hole forming member 65 is disposed at the center of the ring forming portion 62.
When the ring hole forming member 65 is molded integrally with the first elastic body 20, the first elastic body 20 and the first inner member 22 are integrated in advance, and the first elastic body 20 and the first inner member are formed after the molding. When the 22 is fitted and integrated, it is a core corresponding to the first elastic body 20 and the first inner member 22.

Further, regarding the ring forming portion 62, when the end portions P1, P2, Q1, Q2, and the center line C0 in the first ring portion 14 are shown in correspondence with each other, the substantially donut-shaped ring forming portion 62 in the illustrated state has a center line. An upper portion 62A on the upper end portion Q1 side and a lower portion 62B on the lower end portion Q2 side are sandwiched between C0 and these are continuous surrounding the ring hole forming member 65.

Further, in the rod forming portion 64, a core 66 for forming the lightening hole 44 is disposed in the vicinity of the inner end P1 of the ring forming portion 62. The core 66 is arranged so as to be unevenly distributed upwardly asymmetrically with respect to the center line C0. In addition, the core 66 has a substantially triangular shape, with one apex facing the rod forming portion 64 side, and the other two vertices being arranged vertically so that the substantially triangular shape is substantially equidistant from the ring hole forming member 65. However, the core 66 itself has an asymmetric shape with a long lower side. Therefore, an upper passage 67 having a narrow passage cross-sectional area is formed on the upper side, and a lower passage 68 having a large passage cross-sectional area is formed on the lower side, with the core 66 interposed therebetween.

For example, when resin is injected into the mold 60 from the second ring part 16 side by injection molding, the resin flows through the rod molding part 64 to the ring molding part 62, but is divided into two directions by the core 66, The flow is divided into one entering the upper passage 67 as indicated by A and one entering the lower passage 68 as indicated by arrow B.

The resin that has entered the upper passage 67 as indicated by the arrow A has a narrow passage cross-sectional area of the upper passage 67, so that the resin is squeezed here to reduce the speed, and enters the upper portion 62 </ b> A of the ring forming portion 62.
On the other hand, the resin that has entered the lower passage 68 as indicated by arrow B has a large passage cross-sectional area of the lower passage 68, so that the flow velocity is relatively high, and the resin flows into the lower portion 62B of the ring forming portion 62 at a relatively high speed. enter.

The resin that has entered the upper part 62 </ b> A of the ring forming part 62 flows in the direction indicated by the arrow A so as to go around the ring hole forming member 65. On the other hand, the resin that has entered the lower part 62 </ b> B of the ring forming part 62 flows in the direction indicated by the arrow B so as to go around the ring hole forming member 65.
At this time, since the speeds of the resin flowing through the upper part 62A and the lower part 62B are different, while the resin flowing through the slower upper part 62A passes the upper end part Q1 toward the outer end part P2 in the same time, The resin flowing through 62B goes to the upper end Q1 beyond the lower end Q2 and the outer end P2.

For this reason, the front upper portion of the first ring portion 14 in which the low-speed resin flowing in the direction indicated by the arrow A and the high-speed resin flowing in the direction indicated by the arrow B are shifted from the center line C0 by approximately 45 ° to the front side. In 14a (FIG. 1), the outer end portion P2 and the upper end portion Q1 meet to form a weld line 70. The formation position of the weld line 70 is freely adjusted by the speed difference between the resin flow velocity in the direction indicated by arrow A and the resin flow velocity in the direction indicated by arrow B. This speed difference is determined by the arrangement and shape of the core 66. The aperture can be adjusted freely by changing the aperture.

Next, the relationship between the weld line 70 thus formed and the lightening hole 44 will be described with reference to FIG. In FIG. 5, the lightening hole 44 forms a guide portion of the first inner member at the time of collision as will be described later. The opening edge portion in front view includes a front edge portion 44a formed obliquely upward and forward along the ring hole 15, a rear edge portion 44b formed obliquely rearward and rearward, a front edge portion 44a and a rear edge. Each upper end part of the part 44b is connected, and it has comprised the substantially triangular shape which consists of the upper edge part 44c which inclines ahead diagonally upward. The lower portion of the lightening hole 44 extends downward beyond the center line C0, but its extension amount is slight. Between the front edge portion 44a and the ring hole 15, a thin ring portion partition wall 43 that is relatively easily broken is formed.

The upper portion of the lightening hole 44 expands so as to gradually expand upward, greatly extends upward beyond the center line C0, and the upper edge portion 44c is a root portion of the first ring portion 14, and the rod portion 12 The rear upper wall 45 is continuous with the curved portion 46. The rear upper wall 45 is thicker and more rigid than the ring partition wall 43, and is provided on the front upper portion 14a at approximately 45 ° rearward and upward with respect to the center O1 of the first ring portion 14. The weld line 70 and the center O1 are located on substantially opposite sides. The rear edge portion 44b is a guide slope of the first inner member 22 at the time of collision.

That is, at the time of the collision, the first inner member 22 moves rearward along the center line C0 as indicated by an arrow d, collides with the ring partition wall 43 as indicated by a virtual line D, and breaks the ring partition wall 43. To do. Reference numeral 72 in the figure is a broken portion at this time.
The first inner member 22 that breaks the ring partition wall 43 and enters the lightening hole 44 further moves rearward and comes into contact with the rear edge 44b. Since the rear edge portion 44b forms a rear obliquely rising guide slope, the first inner member 22 is guided by the rear edge portion 44b and moves rearward obliquely upward as indicated by an arrow e, and as shown by an imaginary line E. It collides with the side upper wall 45 and breaks it. Reference numeral 74 denotes a fracture portion at this time. The rear upper wall 45 is a planned destruction portion that is directly destroyed by the first inner member 22.

When the rear upper wall 45 is ruptured, a rupture portion 76 is formed along the weld line 70 in the front upper portion 14a by this impact, and is ruptured almost simultaneously. As a result, the broken torque rod 10 cannot support the engine, and the engine quickly moves to the lower side of the vehicle body due to its own weight. The formation location of the weld line 70 is set so that the weld line 70 is broken in conjunction with an impact caused by the breakage of the rear upper wall 45 which is a planned breakage portion.

Next, the operation in this embodiment will be described. As shown in FIG. 4, when the core 66 that forms the hollow hole is arranged and molded, the weld line 70 is shifted from the center line C0 in the first ring portion 14, in this example, from the upper end Q1. Since it is formed at a position P3 that is shifted by about 45 ° toward the outer end P2, the weld line 70 is formed at this position even if a large stress is applied to the outer end P2 of the first ring portion 14 in the direction of the center line C0. not exist. For this reason, since the weld line 70 having a low strength is located away from the portion where the stress is highest, the torque rod 10 is not easily broken and has high durability.

In addition, the weld line 70 that is offset from the center line C0 in this way can be easily formed by using the core 66 for forming the lightening hole 44, and the weld line 70 that is unevenly distributed by the core 66. The lightening holes 44 can be formed simultaneously.
In addition, the position of the weld line 70 can be easily adjusted by adjusting the core 66.

The position of the weld line 70 can be freely adjusted by changing the arrangement, size, shape, and the like of the core 66. For example, the position of the weld line 70 can be set upward or at an angle of 45 °. Therefore, the position of the weld line 70 can be easily adjusted, and the formation position of the weld line 70 can be freely changed according to specifications.

Furthermore, it is possible not only by such a core 66 but also by changing the cross-sectional area of the first ring portion 14. For example, the cross-sectional areas of the upper part 62A and the lower part 62B of the ring forming part 62 may be different. When the cross-sectional area changes, the resistance to resin flow changes, and the smaller the cross-sectional area, the greater the resistance and the lower the flow velocity. Therefore, for example, if the cross-sectional area of the upper part 62A is made smaller than that of the lower part 62B, the flow velocity in the upper part 62A having a smaller cross-sectional area becomes slower than that of the lower part 62B, so that the weld line 70 can be shifted upward from the center line C0. it can.

In addition, as shown in FIG. 5, the first ring portion 14 is disposed in the vicinity of the rear inner wall 22 and in the vicinity of the rear upper wall 45 so as to be biased upward so that it is a portion to be destroyed. The weld line 70 can be formed without fail in the front upper part 14a that is a position where the rear upper wall 45 is destroyed by the impact caused by the destruction. Therefore, it is possible to provide the weld line 70 at an advantageous position that does not significantly affect the rigidity reduction at the time of non-collision and is surely destroyed at the time of collision by utilizing the hollow hole 44.

In addition, at the time of the collision, since the lightening hole 44 guides the first inner member 22 toward the planned destruction portion, the rear upper wall 45 and the front upper portion 14a where the weld line 70 is provided are destroyed at the same time. The first ring portion 14 can be destroyed accurately and reliably at the time of a collision. In addition, since the adjustment of the lightening hole 44 can be made freely by adjusting the core 66, the position of the weld line 70 can also be adjusted freely by adjusting the lightening hole 44.

10: torque rod, 12: rod portion, 14: first ring portion, 15: ring hole, 16: second ring portion, 17: ring hole, 18: main body portion, 20: first elastic body, 22: first Inner member, 30: second elastic body, 32: second inner member, 44: hollow hole, 60: mold, 62: ring molded part, 64: rod molded part, 66: core, 70: weld line, 72, 74, 76: fracture part, C0: center line

Claims (6)

Ring portions (14, 16) are integrally formed at both longitudinal ends of the rod portion (12) ,
One ring portion is a first ring portion (14) connected to the engine via a first inner member (22) provided at the center portion, and the other ring portion is a second ring portion provided at the center portion. In the resin torque rod as the second ring portion (16) connected to the vehicle body via the inner member (32) ,
When viewed from the front, the first ring portion (14) is disposed on the center line (C0) connecting the centers of the first ring portion (14) and the second ring portion (16). The outer side on the opposite side across the center (O1) of the rear inner end (P1) and the first inner member (22) in the direction in which the first inner member (22) moves in accordance with the retreat. Provided with an end (P2), and further provided with an upper end (Q1) shifted by 90 ° upward from the inner end (P1) and the outer end (P2),
The rod part (12) is provided with a lightening hole (44) disposed asymmetrically in the vicinity of the first ring part (14) with respect to the center line (C0) upward.
By providing this hollow hole (44), the weld formed by shifting the resin flow during molding of the first ring portion from the center line (C0) by making the resin flow asymmetric with respect to the center line (C0). Providing a line (70) between the outer end (P2) and the upper end (Q1);
The said hollowing hole (44) comprises the guide part which guides the said 1st inner member (22) to the predetermined destruction plan part (45) at the time of a collision,
The planned destruction portion (45) is located behind the upper end (Q1) and above the inner end (P1),
The resin torque rod , wherein the planned fracture portion (45) and the weld line (70) are located on opposite sides of the center (O1) . The resin torque rod according to claim 1, wherein the weld line (70) is formed at a position shifted by about 45 ° from the upper end (Q1) to the outer end (P2) . The said hollowing hole (44) is arrange | positioned asymmetrically with respect to the centerline (C0), and the asymmetrical cross-sectional area part was formed in the both sides of the hollowing hole (44) which pinched | interposed the centerline (C0). The resin torque rod according to claim 1 . Resin torque rod of claim 1, wherein the lightening holes (44) forms an asymmetric shape with respect to the center line (C0). The opening edge portion of the lightening hole (44) includes a front edge portion (44a) along the ring hole (15) formed in the first ring portion (14), and a rear side of the front edge portion (44a). The resin torque rod according to claim 1 , further comprising a rear edge portion (44b), the rear edge portion (44b) forming a guide slope that is inclined rearwardly upward . The resin torque rod according to claim 1, wherein a cross-sectional area of the ring portion (14) is asymmetric with respect to a center line (C0).

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