JP4261261B2 - Power shift and shift cable connection structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a connection structure between a power shift of a transmission and a shift cable.
[0002]
[Prior art]
Conventionally, transmission gears are operated by operating the shift lever according to the driving conditions. However, in vehicles such as buses, cab-over vehicles, and crane vehicles where the shift lever and transmission are separated, there is a link mechanism or shift between them. A remote control type speed change operation mechanism connected by a cable or the like is used (for example, see Patent Document 1).
[0003]
Conventionally, in this type of speed change operation mechanism, a cross shaft as shown in FIGS. 5 and 6 is used to connect a shift cable to a power shift mounted on a transmission.
5 and 6, reference numeral 1 denotes a cross shaft that is bridged between the clutch housing 7 and the side rail 9 via brackets 3 and 5. The cross shaft 1 is connected to the bracket 3 via a ball joint. , 5 and a shaft main body 13 which can be slidably mounted in the axial direction thereof, and two levers 15 and 17 having different lengths projecting downward from the shaft main body 13. Are attached with a ball joint 19 that can rotate about an axis, and a ball joint 19-1 that can rotate about the axis and slide in the axial direction.
[0004]
In the figure, 21 is a power shift that is attached to the control cover 23 at the upper part of the transmission main body, and is a rod between the input shaft (joint) 25 movable in the front-rear direction and the short lever 15 among the levers 15 and 17. 27 are connected via a ball joint 29, and the rod 27 is arranged on the same line as the input shaft 25 of the power shift 21 as shown in FIG.
[0005]
On the other hand, as shown in FIG. 5, the other long lever 17 of the cross shaft 1 is inclined obliquely in the direction of the side rail 9 and is attached to the shaft body 13, and its tip side is further offset to the side rail 9 side. A bent shape is formed, and a shift cable 31 is connected to the tip of the bent cable 31 via a cylindrical joint 33.
Thus, by using the cross shaft 1, the resin-made shift cable 31 is offset from the exhaust tube 35 laid out in the vicinity of the transmission, and the distance between the exhaust tube 35 serving as a heat source and the shift cable 31 is secured. Conversion of the lever ratio (change the length of the two levers 15 and 17, input the stroke amount of the shift cable 31 with the long lever 17, and output this from the short lever 15 to the power shift 21. Thus, the stroke amount from the shift cable 31 is converted into a small stroke amount corresponding to the power shift 21).
[0006]
[Patent Document 1]
JP-A-64-88814 (page 3, FIG. 1)
[0007]
[Problems to be solved by the invention]
However, since the power shift and shift cable connection structure using the cross shaft is complicated and expensive, a simple structure and a low cost power shift and shift cable connection structure have been desired. .
[0008]
The present invention has been devised in view of such circumstances, and by using a simple lever instead of the cross shaft as described above, the shift cable can be offset from the exhaust tube as a heat source with a simple structure, An object of the present invention is to provide a low-cost power shift and shift cable connection structure capable of changing the lever ratio.
[0009]
[Means for Solving the Problems]
In order to achieve such an object, the invention according to claim 1 is a connecting structure of a power shift and a shift cable that transmits the shift operation of the shift lever to the power shift of the transmission through the shift cable, A conversion lever is rotatably attached to the input shaft, and a tension rod that is swingably attached to the power shift attachment part of the transmission is connected to one end side of the conversion lever, and the tension rod moves back and forth on one end side of the conversion lever. The connecting portion with the tension rod is used as the rotation center of the conversion lever, and a shift cable is connected to the other end of the conversion lever.
[0010]
According to a second aspect of the present invention, in the power shift and shift cable connecting structure according to the first aspect, the stroke amount of the power shift is converted to the stroke amount of the shift cable by the shift operation of the shift lever. Lever ratio between the length (L2) between the tension rod connecting portion of the lever and the shift cable connecting portion and the length (L1) between the tension rod connecting portion of the conversion lever and the input shaft connecting portion of the power shift It is characterized by being converted to (L2 / L1).
[0011]
According to a third aspect of the present invention, the shift cable is connected to the conversion lever at an angle with respect to the longitudinal movement direction of the input shaft of the power shift. In the structure, the tension rod is tilted with respect to the longitudinal direction of the power shift input shaft and connected to the conversion lever to convert the component force in the opposite direction from the lateral component force generated by the shift cable movement. It is generated in a lever.
[0012]
(Function)
According to the first aspect of the present invention, when the shift operation of the shift lever is input from the shift cable to the conversion lever, the conversion lever is restricted in tension by the tension rod. The connecting portion with the rod is rotated about the rotation center, and the power shift input shaft is stroked.
[0013]
According to the second aspect of the invention, the conversion lever converts the stroke amount of the power shift into the lever ratio (a large stroke amount from the shift cable input to the conversion lever is converted into a small stroke amount suitable for the power shift. In addition, according to the invention of claim 3, a force is applied in an oblique direction from the shift cable in accordance with the movement of the conversion lever to generate a lateral component force on the conversion lever. A component force in the opposite direction that cancels out is generated, and the stroke is smoothly performed without a power shift.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In addition, the same thing as the prior art example shown in FIG.5 and FIG.6 attaches | subjects the same code | symbol, and those description is abbreviate | omitted.
1 and 2 show a connecting structure of a power shift and a shift cable according to one embodiment of claims 1 to 3. In FIG. 1, 37 is rotatably connected to an input shaft 25 of the power shift 21. As shown in the figure, the conversion lever 37 is formed of a substantially strip-shaped plate material in which the portion offset from the center toward the side rail 9 is formed in the widest width, and is formed in the widest width. The input shaft 25 is connected to the part through a joint 39.
[0015]
In FIG. 2, reference numeral 41 denotes a bracket that is attached to the power shift attachment portion of the control cover 23, and the tension rod 43 can swing from the position indicated by the solid line in FIG. Is attached.
On the other hand, the other end side of the tension rod 43 is connected to one end side 37a of the conversion lever 37 via a ball joint 47, and the conversion lever 37 is restricted from moving back and forth on the one end side 37a by the tension rod 43. As shown in FIG. 3, the conversion lever 37 can rotate in the direction of the arrow (shift position) from the neutral position indicated by the solid line, with the connection portion P with the tension rod 41 as the center of rotation.
[0016]
Then, as shown in FIG. 2, the shift cable 31 is arranged obliquely from the side rail 9 side to the other end side 37 b of the conversion lever 37, that is, before and after the input shaft 25 of the power shift 21 so as to avoid the exhaust tube 35 as a heat source. It is connected from diagonally forward and shifted from the moving direction. When the shift cable 31 is moved by the shift operation of the shift lever, the back and forth movement of the one end side 37a of the conversion lever 37 is restricted by the tension rod 43 as described above, so the conversion lever 37 is connected to the tension rod. With the portion P as the center of rotation, the input shaft 25 moves linearly in the axial direction without rotating the power shift 21 by rotating in the direction of the arrow in FIG. Thus, the shift operation of the shift lever is smoothly transmitted to the transmission.
[0017]
At this time, as shown in FIG. 3, the stroke amount of the input shaft 25 of the power shift 21 and the tension rod connecting portion P of the conversion lever 37 and the shift cable with respect to the stroke amount of the shift cable 31 due to the shift operation of the shift lever. Converted into a lever ratio (L2 / L1) between the length (L2) between the connecting portions Q and the length (L1) between the tension rod connecting portion P of the conversion lever 37 and the input shaft connecting portion of the power shift 21 Thus, a large stroke amount from the shift cable 31 input to the conversion lever 37 is converted into a small stroke amount suitable for the power shift 21.
[0018]
Further, as described above, when the shift cable 31 is obliquely connected to the other end side 37b of the conversion lever 37, when an oblique force is applied from the shift cable 31 to the conversion lever 37 by a shift operation of the shift lever, As shown in FIG. 4, a lateral component A is generated in the conversion lever 37.
Therefore, in the present embodiment, when the tension rod 43 is connected to the one end side 37a of the conversion lever 37, the tension rod 43 is shifted obliquely outward with respect to the longitudinal movement direction of the input shaft 25 as shown in FIGS. In order to connect to the conversion lever 37 by tilting and to cancel the component force A acting on the conversion lever 37, the following characteristics are provided.
[0019]
That is, in FIG.
θ1: Connection angle θ2 of the shift cable 31 with respect to the straight line M parallel to the longitudinal movement direction of the input shaft 25; Connection angle L1 of the tension rod 43 with respect to the straight line M parallel to the longitudinal movement direction of the input shaft 25; The length L3 between the connecting portion and the input shaft connecting portion of the power shift 21; the L1 is subtracted from the length (L2) between the tension rod connecting portion and the shift cable connecting portion of the conversion lever 37 (L2-L1). Each length is shown, but this embodiment is
L3: L1 = 1: 3
θ1: θ2 = 3: 1
Thus, by setting the ratio between the lengths (L1) and (L2) and the connection angles (θ1) and (θ2), the component force in the opposite direction that cancels the component force A is set. B is generated in the conversion lever 37.
[0020]
2, 49 and 50 are support brackets for supporting the shift cable 31 to the clutch housing, 51 is a support bracket for supporting the shift cable 31 to the side rail 9, and the shift bracket 31 is inclined by the support brackets 49 and 50. It is guided to the conversion lever 37 from the front.
Since the present embodiment is configured as described above, when the shift operation is input from the shift cable 31 to the conversion lever 37 by the shift operation of the shift lever, the conversion lever 37 is moved to the one end side 37 a by the tension rod 43. Since the forward / backward movement is restricted, the conversion lever 37 rotates in the direction of the arrow in FIG. 3 around the connection portion P with the tension rod, and the input shaft 25 of the power shift 21 is converted into a lever ratio (conversion lever). 37, the large stroke amount from the shift cable 31 input to 37 is converted into a small stroke amount suitable for the power shift 21, and the stroke is made.
[0021]
At this time, as shown by a two-dot chain line in FIG. 3, the tension rod 41 swings in the direction of the arrow to prevent the power shift 21 from shaking, so that the input shaft 25 does not move but linearly strokes in the axial direction. Thus, the shift operation is transmitted to the transmission.
Further, along with the movement of the conversion lever 37, a force is applied in an oblique direction from the shift cable 31 to generate a lateral component A in the conversion lever 37. As described above, the present embodiment has such a configuration. Since the component force B in the opposite direction that cancels the component force A is generated, the input shaft 25 is not affected by the component force A and the lever ratio is converted by the conversion lever 37 so that the input shaft 25 is smoothly stroked in the axial direction. It becomes.
[0022]
The shift cable 31 obliquely connected to the conversion lever 37 is supported at a predetermined position with a sufficient distance from the exhaust tube 35 serving as a heat source via the support brackets 49, 50, 51. Even if the cable 31 is connected to the conversion lever 37 from an oblique direction, the power shift 21 functions normally by the functions of the conversion lever 37 and the tension rod 41 as described above.
[0023]
As described above, according to the present embodiment, the stroke amount of the power shift 21 is changed to the lever ratio by using the conversion lever 37 and the tension rod 41 having a simple structure as compared with the conventional cross shaft 1 shown in FIG. Since the shift cable 31 can be separated from the exhaust tube 35 serving as a heat source and the shift cable 31 can be arranged at a position offset from the center of the power shift 21, the structure is simpler than that of the conventional example. Thus, it is possible to provide a connection structure between the power shift 21 and the shift cable 31 at a low cost.
[0024]
【The invention's effect】
As described above, according to the inventions according to the claims, the power shift stroke amount can be converted into the lever ratio as in the prior art, and the power shift and shift cable are simpler in structure and lower in cost than in the past. It is possible to provide a connection structure.
According to the third aspect of the present invention, even if a force acts in an oblique direction from the shift cable and a lateral component force is generated on the conversion lever, a component force in the opposite direction that cancels the component force is generated. Since it is made to generate | occur | produce, it has an advantage which can stroke smoothly, without a power shift blurring.
[Brief description of the drawings]
FIG. 1 is an overall perspective view of a power shift / shift cable connection structure according to an embodiment of claims 1 to 3;
FIG. 2 is a plan view of the connection structure shown in FIG.
FIG. 3 is a plan view of a principal part of the connection structure shown in FIG. 1;
FIG. 4 is a functional explanatory diagram of the connection structure shown in FIG. 1;
FIG. 5 is an overall perspective view of a conventional connecting structure of a power shift and a shift cable.
6 is a plan view of the connection structure shown in FIG. 5. FIG.
[Explanation of symbols]
7 Clutch housing 9 Side rail 21 Power shift 25 Input shaft 31 Shift cable 35 Exhaust tube 37 Conversion lever 43 Tension rod

Claims (3)

A power shift and shift cable coupling structure that transmits the shift operation of the shift lever to the power shift of the transmission via the shift cable,
A conversion lever is rotatably attached to the input shaft of the power shift, and a tension rod attached to a power shift attachment portion of the transmission is swingably connected to one end of the conversion lever, and one end of the conversion lever is connected with the tension rod. The power shift and the shift cable are connected to each other, with the connecting portion with the tension rod being the center of rotation of the conversion lever and a shift cable connected to the other end of the conversion lever. Construction. The shift amount of the power shift is the length (L2) between the tension rod connection part of the conversion lever and the shift cable connection part, and the tension rod connection of the conversion lever with respect to the shift cable stroke amount by the shift lever shift operation. 2. The power shift and shift cable coupling structure according to claim 1, wherein the ratio is converted into a lever ratio (L 2 / L 1) with respect to a length (L 1) between the input portion and the input shaft connecting portion of the power shift. . 3. The power shift and shift cable coupling structure according to claim 1 or 2, wherein the shift cable is connected to the conversion lever at an angle with respect to the longitudinal direction of the power shift input shaft. Tilt the input shaft of the shift diagonally with respect to the longitudinal direction of movement and connect it to the conversion lever.
A structure for connecting a power shift and a shift cable, wherein the conversion lever generates a component force in the opposite direction to the lateral component force generated by the movement of the shift cable.

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