JP4594774B2 - bush - Google Patents

Description

  The present invention relates to a bush for rotatably connecting a connecting portion of a cable to a predetermined shaft portion.

Conventionally, in a manual transmission (MT) vehicle and an automatic transmission (AT) vehicle, a shift lever for performing a shifting operation and the transmission are connected via a cable (so-called control cable). This type of cable has a ring-shaped connecting portion at the end, and is rotatably connected to a shaft portion provided on the shift lever side via a bush. For example, Patent Document 1 proposes a bush having a cylindrical shape and having flange portions formed at both ends thereof.
Japanese Utility Model Publication No. 63-11914 (FIGS. 1 and 2)

  However, in the conventional bush as described above, there is a problem that it is difficult to attach the bush to the connecting portion because the flange portion having a diameter larger than the inner diameter of the connecting portion is provided for preventing the disconnection. Therefore, as shown in FIG. 10, a collar portion 51a is provided at one end of the cylindrical body 51, and claw portions 51b, 51b, 51b, 51b that are elastically deformable in the radial direction are provided at the other end, respectively. A bush 50 that is easy to install has been proposed.

  However, since both bushes have a structure in which it is difficult to remove the connecting portion from the bush once the cable connecting portion and the bush are fitted together, the friction between the shaft portion and the bush during operation of the shift lever In the unlikely event that the shaft and the bush are fixed due to generated heat or the like, it is difficult to remove the cable from the shaft. In addition, when the claw portion 51b is provided, foreign matter accumulates in the groove 52 between the claw portion 51b and the claw portion 51b, the shaft portion 70 is unevenly worn by the groove 52, and the claw portion 51b is located at the sliding portion. Therefore, the claw portion 51b may be damaged.

  The present invention solves the above-mentioned conventional problems, and can be easily mounted without providing a claw portion, and even if the bush is fixed to the shaft portion, the cable can be reliably removed from the shaft portion. The object is to provide a bush that can be used.

  The present invention provides a sliding part having a sliding part inserted into a connecting part provided in a cable, wherein the connecting part is rotatably connected to and supported by a predetermined shaft part via the sliding part. A holding portion that extends from the moving portion and holds the cable is provided, and the holding portion and the sliding portion are connected by a fragile portion.

  According to the present invention, even if the shaft portion and the sliding portion are fixed to each other, the cable can be detached from the shaft portion by breaking the sliding portion and the holding portion at the fragile portion. . In addition, since the cable is held by a holding portion provided separately from the sliding portion, it is not necessary to provide a pawl portion on the sliding portion.

  For example, the sliding portion and the holding portion are integrally formed of a synthetic resin, and the fragile portion is configured by at least one of a constricted portion, a groove portion, and a hole. Since the constricted portion, the groove, and the hole become weaker than others, the sliding portion and the holding portion can be broken at this portion.

  Moreover, it is preferable that the said holding | maintenance part is a shape which can be fitted to the said cable. By adopting such a shape, it is possible to easily attach the cable to the cable and to prevent the assembly workability from being impaired.

  The sliding portion may be formed of only a cylindrical body having an outer diameter smaller than the inner diameter of the connecting portion, and the fragile portion may be set to be broken inside the inner wall surface of the connecting portion. With this configuration, the cable can be pulled out with the sliding portion remaining on the shaft portion at the time of fixing, regardless of the direction in which the sliding portion is attached to the shaft portion. Note that the term “breaking inside the inner wall surface” includes the case of breaking at a position coinciding with the inner wall surface.

  According to the present invention, mounting is easy even without providing a claw portion on the sliding portion, and even if the sliding portion is fixed to the shaft portion, the cable can be reliably removed from the shaft portion. Therefore, accumulation of foreign matter, uneven wear of the shaft portion, and breakage of the claw portion, which are problems caused by providing the claw portion, can be prevented.

(First embodiment)
FIG. 1 is a partially transparent side view showing a vehicle in which the bush of this embodiment is used, FIG. 2 is a perspective view showing a state before the connection of the bush of the first embodiment, and FIG. 3 is a view of the bush of the first embodiment. The state after attaching to a cable is shown, (a) is a rear view, (b) is an AA cross-sectional view of (a), and FIG. a) is the state before the cable is removed, and (b) is the state after the cable is removed.

  As shown in FIG. 1, the bush 1 </ b> A of the first embodiment is used in, for example, a vehicle V, and a gear 10 connected to a transmission TM of an engine E is provided with a speed change operation provided on the passenger compartment side. It is used when connecting to a shift lever SL for performing the above. The shift lever SL is provided with a shaft portion 20 that can be swung according to a speed change operation, and an end portion of the cable 10 is rotatably connected to the shaft portion 20 via a bush 1A. For example, when the shift lever SL is tilted forward, the shaft portion 20 is moved rearward and the cable 10 is pulled rearward. When the shift lever SL is tilted rearward, the shaft portion 20 is moved forward and the cable 10 is moved. It is pushed forward. In this way, the pushing and pulling operation of the shift lever SL can be reliably transmitted to the transmission TM.

  As shown in FIG. 2, the shaft portion 20 is formed in a cylindrical shape with a metal material or the like, and is fixed so as to protrude from a surface 30 formed on the shift lever SL (see FIG. 1) side. Further, the shaft portion 20 is formed with a pin insertion hole 20a penetrating at the tip thereof. On the other hand, the cable 10 is provided with an annular connecting portion 10a and a fixing portion 10b each having a substantially rectangular cross section, each of which is made of a metal material.

  As shown in FIG. 2, the bush 1 </ b> A has a sliding part 2 and a holding part 3. The sliding portion 2 includes a cylindrical body 2a that can be inserted and fitted into the insertion hole 10a1 of the connecting portion 10a, and a flange portion 2b that is integrally formed on a peripheral edge portion on one opening side of the cylindrical body 2a. It is configured. As shown in FIG. 3 (b), when the cylindrical body 2a is inserted to a predetermined position in the insertion hole 10a1 of the connecting portion 10a, the tip of the cylindrical body 2a is slightly opened from the opening on the opposite side of the connecting portion 10a. It is designed to protrude. Further, the cylindrical body 2a has a chamfer 2c formed at the opening edge portion on the flange portion 2b side. Moreover, the collar part 2b is formed so that it may become a diameter substantially the same as the outer diameter of the connection part 10a.

  As shown in FIG. 2, the holding part 3 is formed to extend from the sliding part 2. The holding portion 3 includes an extending portion 3a extending so as to be flush with the flange portion 2b, and a pair of locking portions 3b and 3b formed in a hook shape on both sides of the extending portion 3a. ing. The opposing distance between the locking portions 3b and the tips of the locking portions 3b is formed narrower than the width dimension S of the fixing portion 10b formed on the cable 10, and the holding portion 3 can be fitted to the fixing portion 10b. It has become.

  As shown in FIG. 3A, a constricted portion 4 is formed at a boundary portion between the collar portion 2 b and the holding portion 3 of the sliding portion 2. The narrow portion 4 of the present embodiment is formed such that the width dimension W is shorter than the thickness (width) dimension R of the cable 10.

  The bush 1A is preferably formed of a synthetic resin material such as POM (polyacetal) or PA (polyamide) in terms of strength, elastic modulus, impact resistance, and sliding characteristics. Moreover, in POM, you may form so that a glass fiber may be included and intensity | strength may be raised.

  In the above-described bush 1A, as shown in FIG. 3 (b), the sliding portion 2 is inserted into the connecting portion 10a provided in the cable 10 until the collar portion 2b comes into contact with one end surface of the connecting portion 10a. The At the same time, the locking portions 3b and 3b of the holding portion 3 are pressed against the fixed portion 10b, so that the locking portions 3b and the locking portions 3b are elastically deformed so as to spread outward and then elastically return. The holding portion 3 is fitted to the fixed portion 10b. Then, with the bush 1 </ b> A attached to the cable 10, the sliding portion 2 is inserted through the shaft portion 20 so that the collar portion 2 b faces the inner side (surface 30 side). After the insertion, the retaining pin 40 is inserted into the pin insertion hole 20a of the shaft portion 20 protruding from the sliding portion 2. The retaining means is not limited to the configuration of the pin insertion hole 20a and the retaining pin 40. Further, the cable 10 may be attached to the bush 1A after the bush 1A is inserted through the shaft portion 20.

Next, the operation of the bush 1A of the first embodiment will be described with reference to FIG. In FIG. 4, illustration of the retaining means is omitted.
In the unlikely event that the sliding portion 2 and the shaft portion 20 of the bush 1A are firmly fixed, as shown in FIG. 4A, the force F is directed toward the direction in which the cable 10 is removed from the shaft portion 20 (upward in FIG. 4). give. As a result, as shown in FIG. 4B, the sliding portion 2 and the holding portion 3 are broken at the position where the constricted portion 4 is formed, and the sliding portion 2 remains on the shaft portion 20. Is attached to the cable 10, and the cable 10 can be detached from the shaft portion 20. That is, by providing the constricted portion 4, the constricted portion 4 becomes weaker than the other portions. Therefore, when the force F is applied to the cable 10, the sliding portion 2 and the holding portion are located at the position of the constricted portion 4. 3 can be broken. In this way, the cable 10 can be detached from the shaft portion 20. The constricted portion 4 is set so as not to be broken by a force due to a normal shift operation, and to be broken only when a force F much larger than a force given by a normal shift operation is applied. . In addition, there is a possibility that the sliding portion 2 and the shaft portion 20 are fixed to each other when the shaft portion 20 is caused by heat generated by the rotation operation of the sliding portion 2 and the shaft portion 20 or heat applied from the outside. This is the case when thermal expansion occurs.

  Further, in the bush 1A of the present embodiment, since it is not necessary to provide the claw portion on the sliding portion 2, no foreign matter is collected in the groove between the claw portion and the claw portion, and the shaft portion 20 is biased by the groove. There is no wear and no problems such as breakage of the claw portion occur.

(Second Embodiment)
FIG. 5: shows the bush of 2nd Embodiment, (a) is a top view, (b) is BB sectional drawing of (a). The bush 1B of the second embodiment is configured by a groove portion 5 instead of the constricted portion 4 in the bush 1A of the first embodiment. Since other configurations are the same as those of the first embodiment, the same reference numerals are given and the description thereof is omitted.

  The groove portion 5 in the bush 1B is formed linearly along the thickness (width) direction of the cable 10 at the boundary portion between the sliding portion 2 and the holding portion 3. Even in such a bush 1B, since the groove portion 5 becomes thinner and weaker than the other portions, the sliding portion 2 and the holding portion 3 can be used in the event that the sliding portion 2 is fixed to the shaft portion 20 by any chance. And the cable 10 (see FIGS. 2 to 4) can be detached from the shaft portion 20.

  In addition, the said groove part 5 is not limited to the surface (lower surface in FIG.5 (b)), You may form in the back surface (upper surface in FIG.5 (b)). Or you may form in both the front surface and a back surface.

(Third embodiment)
FIG. 6 is a plan view showing the bush of the third embodiment. The bush 1C of this embodiment has a configuration in which the constricted portion 4 in the bush 1A of the first embodiment and the groove portion 5 in the bush 1B of the second embodiment are combined. Also in the bush 1C, the sliding portion 2 and the holding portion 3 can be broken at the constricted portion 4 and the groove portion 5 as in the first and second embodiments. In addition, the groove part 5 in this case may also be formed in the back surface or both surfaces, as demonstrated in 2nd Embodiment.

(Fourth embodiment)
7A and 7B show a bush according to a fourth embodiment, in which FIG. 7A is a plan view, and FIG. In this bush 1D, the fragile portion of the present embodiment is configured by a plurality of holes 6. The plurality of holes 6 are linearly arranged along the width direction of the cable 10 at predetermined intervals. Also in this bush 1D, the portion of the hole 6 becomes weaker than the others, so that the sliding portion 2 and the holding portion 3 can be broken along the plurality of holes 6. The diameter, number and arrangement of the holes 6 can be changed as appropriate. Moreover, you may comprise combining this hole 6 and the above-mentioned narrow part 4 and the groove part 5. FIG.

(Fifth embodiment)
8A and 8B show a state after the bushing of the fifth embodiment is attached to the cable. FIG. 8A is a plan view, FIG. 8B is a sectional view taken along the line DD in FIG. 9A, and FIGS. (b) is explanatory drawing which shows the effect | action of the bush of 5th Embodiment, respectively. This bush 1E has a sliding part 2A and a holding part 3A, and is formed with a constricted part 4 and a groove part 5 as weak parts at the boundary between the sliding part 2A and the holding part 3A. In other words, in the fifth embodiment, the sliding portion 2A does not include the collar portion 2b as in the first to fourth embodiments, and the outer diameter is a cylinder smaller than the inner diameter of the connecting portion 10a (the diameter of the insertion hole 10a1). It consists only of the body 2a, and the cylindrical body 2a is fitted to the connecting portion 10a. Further, chamfers 2c and 2d are formed at both opening edges of the sliding portion 2A. In this bush 1E, the weak part by the constriction part 4 and the groove part 5 is set in the position which corresponds with the inner wall face 10a2 of the connection part 10a. In addition, the weak part in 5th Embodiment is not limited to the combination of the constriction part 4 and the groove part 5, As shown in 1st Embodiment, only the constriction part 4 was shown in 2nd Embodiment. Thus, only the groove portion 5 or only the plurality of holes 6 as shown in the fourth embodiment may be used. Moreover, the weak part by the constriction part 4 and the groove part 5 may be located inside the inner wall face 10a2 of the connection part 10a.

  In the bush 1E of the fifth embodiment, as shown in FIG. 9A, when the sliding portion 2A is attached to the shaft portion 20 from the chamfer 2c side, the sliding is performed in the same manner as in the first embodiment. Even if the portion 2 and the shaft portion 20 are fixed, the sliding portion 2 and the holding portion 3A are broken, the sliding portion 2 is left on the shaft portion 20, and the holding portion 3A is attached to the cable. The cable 10 can be removed from the shaft portion 20. Furthermore, in the bush 1E of the fifth embodiment, as shown in FIG. 9B, even if the sliding portion 2 is attached to the shaft portion 20 from the chamfer 2d side, the sliding portion 2 and the shaft portion 20 In the unlikely event that the sliding portion 2 and the holding portion 3A are broken inside the inner wall surface (sliding surface) 10a2 of the connecting portion 10a, the cable 10 can be pulled out from the shaft portion 20. Thus, in the bush 1E of the fifth embodiment, the bush 1E can be attached to the shaft portion 20 from either side.

  The present invention is not limited to the cable 10 that connects the transmission TM and the shift lever SL, but a cable that connects the accelerator pedal and the engine (accelerator pedal and accelerator pedal sensor in a drive-by-wire system). Various cables such as a brake pedal, a cable for connecting a brake lever and a braking device can be applied. Further, the present invention is not limited to the vehicle V such as an automobile, and can be applied to an aircraft, a ship, and the like.

  Moreover, as a weak part, it is not limited to the constriction part 4, the groove part 5, and the some hole 6, For example, the boundary part of the sliding part 2 and the holding parts 3 and 3A is used as the sliding part 2 or the holding part. You may make it form with another kind of synthetic resin which is easy to fracture | rupture rather than 3,3A. However, in this case as well, as described above, the force F (see FIG. 4A) required for breaking the sliding portions 2 and 2A and the holding portion 3 is larger than the force required for a normal speed change operation or the like. Great power is set.

It is a partially transparent side view which shows the vehicle in which the bush of this embodiment is utilized. It is a perspective view which shows the state before the connection of the bush of 1st Embodiment. The state after attaching the bush of 1st Embodiment to a cable is shown, (a) is a top view, (b) is AA sectional drawing of (a). It is explanatory drawing which shows the effect | action of the bush of 1st Embodiment, (a) is the state before cable removal, (b) is the state after cable removal. The bush of 2nd Embodiment is shown, (a) is a top view, (b) is BB sectional drawing of (a). It is a top view which shows the bush of 3rd Embodiment. The bush of 4th Embodiment is shown, (a) is a top view, (b) is CC sectional drawing of (a). The state after attaching the bush of 5th Embodiment to a cable is shown, (a) is a top view, (b) is DD sectional drawing of (a). (A), (b) is explanatory drawing which shows the effect | action of the bush of 5th Embodiment, respectively. It is a perspective view which shows the conventional bush.

Explanation of symbols

1A to 1E Bush 2, 2A Sliding part 2a Cylinder 2b Collar part 2c, 2d Chamfer 3, 3A Holding part 4 Neck part 5 Groove part 6 Hole 10 Cable 10a Connection part 10a2 Inner wall surface 10b Fixing part 20 Shaft part

Claims (4)

In a bush having a sliding portion inserted into a connecting portion provided in a cable, and rotatably connecting and supporting the connecting portion to a predetermined shaft portion via the sliding portion,
A bush that extends from the sliding portion, includes a holding portion that holds the cable, and connects the holding portion and the sliding portion at a fragile portion.   2. The bush according to claim 1, wherein the sliding portion and the holding portion are integrally formed of a synthetic resin, and the fragile portion includes at least one of a constricted portion, a groove portion, and a hole. .   The bush according to claim 1, wherein the holding portion has a shape that can be fitted to the cable.   The sliding portion is composed only of a cylindrical body having an outer diameter smaller than the inner diameter of the connecting portion, and the weakened portion is set so as to be broken inside the inner wall surface of the connecting portion. The bush according to any one of claims 1 to 3.

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