JPH0475433B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a manual transmission inserted into a power transmission system of an automobile or the like, and particularly to a select check mechanism thereof.

A manual transmission usually includes a striking rod, which is rotated or axially displaced by a selection operation by the driver, and then shifted axially or rotationally by a shift operation to shift into a predetermined gear. can be done. On the other hand, the driver needs to intuitively know whether the striking rod has reached the position (gear train) corresponding to the requested gear during the above select operation, and for this purpose, manual transmissions are equipped with A select check mechanism is provided to give a sense of moderation each time the rod is at a position corresponding to each gear stage train. For example, the select check mechanism for row 5-R is Nissan Service Bulletin No. 472 (Nissan March, published October 1982).
There are some things shown below.

Such a select check mechanism generally includes a check arm that is rotated by the above-mentioned select operation relative to the transmission case and moved in the direction of the rotation axis by the shift operation, and the arm is rotated by an elastic force. The select check member has a movable part that is pushed against the transmission case and is attached to the transmission case.
Each time a position corresponding to a row is reached, a check element, such as a check ball loaded with a spring, cooperates to provide a sense of moderation during the selection operation.

By the way, the above-mentioned select check member's mounting position with respect to the transmission case remains unchanged, whereas the check arm moves relative to the transmission case during the shift operation after the select operation. are in sliding contact during the shift operation, and the above elastic force (spring reaction force of the select return spring) is always present between the two.
This means that the sliding resistance between the two is large. Therefore, the above-mentioned shift operation that must be performed against this large sliding resistance becomes heavy, and this may make it difficult for the driver to clearly feel the sense of moderation during the shift operation using the separately provided shift check mechanism. As a result, it was inevitable that the shift operation feeling would become extremely poor.
Further, since the sliding portion between the check arm and the select check member has a large sliding resistance, the problem of premature wear is unavoidable.

The present invention embodies this idea from the viewpoint that the above-mentioned problems can be solved all at once by changing the contact between the check arm and the select check member during the shift operation from the conventional sliding contact to rolling contact. The present invention aims to provide a select check mechanism for a manual transmission.

For this purpose, the present invention comprises forming a select check member with a leaf spring, fixing one end of the select check member to the transmission case, and configuring the remaining part of the select check member as the above-mentioned movable part. A rolling contact member that rolls along with the movement of the check arm in the direction of the rotation axis accompanying a shift operation is interposed in the contact portion between the movable portion of the select check member and the movable portion of the select check member that is pushed thereby. do.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

Figures 1 and 2 show an embodiment in which the select check mechanism of the present invention is configured to provide a sense of moderation when selecting the 5th gear - reverse gear. Show each rod. The striking rod 2 is rotatably and axially slidably attached to the boss portion 1a and the rib 1b of the transmission case 1, and one end of the striking rod 2 protrudes outside the transmission case 1 for transmission (not shown). It is connected to a lever, and is rotationally displaced when the shift lever is operated to select, and displaced in the axial direction when the shift lever is operated.

Check arm 3 on striking rod 2
are integrally connected by a roll pin 4, and the check arm 3 has a boss 3a for inserting the striking rod 2 as shown in FIG.
It has a transmission arm 5 integrally. A through hole 5a is bored at the tip of the speed change arm 5, and one end 6a of a bell crank type shift lever 6 is inserted into the through hole. The shift lever 6 is connected to the boss portion 1c and rib 1 of the transmission case 1.
It is fitted rotatably and slidably in the axial direction on the shaft 7 horizontally suspended between d, and the other end 6b of the shift lever 6 is engaged with the groove 9a among the alignment grooves 8a to 10a formed in the shifters 8 to 10. let The shifter 8 is for selecting 1st speed and 2nd speed, the shifter 9 is for selecting 3rd speed and 4th speed, and the shifter 10 is for selecting 5th speed and reverse.
When displacing in the vertical direction in FIG. 1, the shifter 8 shifts to 1st or 2nd gear, the shifter 9 shifts to 3rd or 4th gear, and the shifter 10 shifts to 5th gear via a shift fork (not shown). Alternatively, the converter can be put into reverse.

As shown in FIG. 3, the check arm 3 is
It has a protrusion 3b extending from the boss 3 in a direction opposite to the speed change arm 5, and a flat surface 3c is formed on the protrusion. Also, a boss 3d is provided between the protrusion 3b and the speed change arm 5.
A fifth boss is provided on this boss as shown in Figures 1 and 2.
A reverse erroneous operation prevention mechanism 11 is installed to prevent erroneous operation from speed to reverse.

The select check mechanism of the present invention includes, in addition to the check arm 3, the following related parts. That is, in Figures 1 and 2, 12
Reference numeral 13 indicates a bracket, 13 indicates a select check member made of a leaf spring, and 14 indicates a check ball holder, which are shaped as shown in FIGS. 4 to 6. The bracket 12 is provided with two bolt holes 12a, 12b and one check ball hole 12c as shown in FIG. Attach on the boss portions 1e and 1f. In addition, as shown in FIGS. 5 and 6, the selection check member 13
and the check ball holder 14 also have bolt holes 1, respectively.
3a and 14a are provided, and bolts 15 are inserted through these holes to fasten the select check member 13 and check ball holder 14 together onto the boss portion 1e. When tightening together, the select check member 13 clamps the bracket 12 and prevents it from rotating by a pair of protrusions 13b and 13c provided thereon, and the check ball holder 14 also uses protrusions 14b and 14c provided thereon.
pinch the bracket 12 and stop it from rotating.

The select check member 13 is formed as a whole by a leaf spring, and the remaining parts, excluding the parts 13a to 13c fixed to the transmission case, are elastically deformed in the direction of the plate thickness to form a movable part that can be displaced relative to the transmission case. Configure. And the tip 13 of the movable part
d so as to extend directly below the check ball hole 12c, and a slope 13e is formed on the tip 13d.
form. A check ball 17 as a check element is slidably fitted into the check ball hole 12c and brought into contact with the slope 13e, and the check ball 17 is pressed from above by the check ball holder 14. For this purpose, the check ball presser 14 is also constructed entirely of a leaf spring,
Its tip 14d extends over the check ball 17 and is biased toward the check ball.

A yoke 13f is integrally provided near the tip of the select check member 13, and a roller 18 as a rolling contact member is rotatably supported within the yoke by a pin 19. The roller 18 is directly opposed to the flat surface 3c formed on the protrusion 3b of the check arm 3, and
The normal position of the roller 18 is determined by urging the select check member (plate spring) 13 toward this flat surface by its own spring force, and supporting this spring force by the pin 19 colliding with the stepped portion 12d of the bracket 12. .

The operation of the select check mechanism of the present invention constructed as described above will now be described.

Figures 1 and 2 show the neutral state of the manual transmission, and from this state, the striking rod 2 is moved by selecting the 1st-2nd gear train when viewed from the right end in Figures 1 and 2. When the check arm 3 and the shift arm 5 are rotated in the same direction, the shift lever 6 is rotated in the counterclockwise direction.
is moved downward in FIG. 2 on the shaft 7, and the shift lever end 6b is engaged with the groove 8a. After this select operation, the striking rod 2 is shifted by the shift operation.
When the shift lever 6 is displaced in the axial direction, the shift lever 6 is rotated around the shaft 7 according to the direction, and the shifter 8 is
in the corresponding direction and shift the transmission to 1st or 2nd gear.
It can be put in quickly.

When the striking rod 2 is displaced in the axial direction by a shift operation in the neutral state (3rd speed - 4th speed train) shown in FIGS. 1 and 2, the shift lever 6 rotates around the shaft 7 in accordance with that direction. The shifter 8 can be moved in the corresponding direction to shift the transmission into third or fourth gear.

5 from the neutral state in Figures 1 and 2.
When the striking rod 2 is rotationally displaced in the direction of the hour hand when viewed from the right end in FIGS. 1 and 2 by the selection operation to the speed-reverse row, the check arm 3 and the shift arm 5 rotate integrally in the same direction. Then, the shift lever 6 is moved upward in FIG. 2 on the shaft 7, and the shift lever end 6b is coupled to the groove 10a. When the striking rod 2 is displaced in its axial direction by a shift operation after this selection operation, the shift lever 6 is rotated around the shaft 7 in accordance with the direction, and the shifter 10 is moved in the corresponding direction, shifting the transmission into the first position. It can be engaged in 5th gear or reverse.

By the way, during the above-mentioned rotation of the check arm 3 accompanying the selection operation to the 5th speed-reverse train, the check arm 3 has its flat surface 3c in contact with the roller 18, and the select check member 13 itself is moved through this roller. flex against the spring force. Therefore, the slope 13e of the select check member 13
pushes out the check ball 17 from the hole 12c against the spring force of the check ball holder 14, and the selection operation force suddenly decreases when the check ball 17 crosses the slope 13e (at the completion of the selection operation). This gives a sense of moderation to the selection operation, allowing the driver to switch the striking rod 2 to 5th gear.
You can intuitively know when the rotation position corresponding to the reverse row has been reached.

During the shift operation after this selection operation, the check arm 3 moves relative to the selection check member 13 in the axial direction of the striking rod 2, but during this time the roller 18 rolls on the flat surface 3c, and the check arm 3 and the select check member 13 can be made into rolling contact. Therefore, even if the select check member 13 is pressed against the check arm 3 by its own spring force during the shift operation, the shift operation can be carried out easily.

Thus, as described above, the select check mechanism of the present invention has a structure in which a rolling contact member (roller 18) that rolls during a shift operation is interposed at the contact portion between the check arm 3 and the select check member 13, so that the contact portion is During the shift operation, there will be rolling contact, allowing the shift operation to be carried out easily. Furthermore, the driver can clearly feel the sense of moderation during the shift operation by the separately provided shift check mechanism, and together with this, the shift operation feeling can be greatly improved. In addition, since the select check member 13 is composed of a leaf spring and generates a select return force by itself, the select check member 13 also serves as a select return spring, and the select return spring can be omitted and the select check mechanism The number of parts can be reduced. Furthermore, in this embodiment, the check ball 17
Select check member 13 formed of a leaf spring.
Since it is clamped by the check ball holder 14, the pressing force (that is, the spring constant) after selection is completed (that is, when the check ball 17 crosses the slope 13e) can be significantly reduced without taking up installation space. I can do it. Furthermore, since the contact portion is not a sliding contact, there is little wear and tear, which has the additional advantage of extending the service life of the transmission operating system.

By the way, in the illustrated example configuration. Since the select check member 13 is subjected to large repeated bending stresses at the portion indicated by w in FIG. 5 and is likely to break at this portion, it is advantageous to further widen and reinforce this portion. Further, the check ball presser 14 may have its tip 14d curved over an angle of approximately 180 degrees as shown in FIG. 7 so that the check ball 13 is pressed elastically.

In addition, in the configuration of the illustrated example, a rolling contact member (roller 1
8), a roller is provided at the tip of a swinging arm rotatably attached to the bracket 12, the roller is brought into contact with the check arm, and the swinging arm is pressed toward the check arm side. The leaf spring may be mounted on the bracket. That is, it is sufficient that a rolling contact member is interposed between the select check leaf spring and the check arm.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the select check mechanism of the present invention together with a gear shift operation section of a transmission;
3a is a plan view of the check arm, FIG. 3b is a side view thereof, FIG. 4a is a plan view of the bracket, FIG. 5b is a side view thereof, and FIG. 6 is a plan view of the select check member, FIG. 6 b is a side view thereof, FIG. 6 a is a plan view of the check ball holder, FIG. FIG. 6 is a plan view and a side view similar to FIGS. 6a and 6b, showing a modification of the presser foot; 1...Transmission case, 2...Striking rod, 3...Check arm, 5...Transmission arm, 6...Shift lever, 7...Shift lever shaft, 8-10...Shifter, 12...Bracket , 13...Select check member, 14...Check ball holder, 15, 16...Mounting bolt,
17...Check ball, 18...Roller (rolling contact member), 19...Roller support pin.

Claims (1)

[Scope of Claims] 1. A check arm is provided which is rotated relative to the transmission case by a select operation and moved in the rotation axis direction by a shift operation, and the check arm resists elastic force while being rotated. A manual transmission in which a select check member having a movable part that is pushed is attached to a transmission case, and the movable part cooperates with the check element during pushing to produce a sense of moderation during a select operation. In, the select check member is formed with a leaf spring,
One end of the select check member made of a leaf spring is fixed to the transmission case, and the remaining part of the select check member is configured as the movable portion, and the select check member movable is moved by the check arm and the select check member pushed by the check arm. A select check mechanism for a manual transmission, in which a rolling contact member that rolls as the check arm moves in the direction of the rotational axis accompanying a shift operation is interposed in the contact portion between the check arm and the check arm.