JPH0733010Y2 - Reverse transmission shift prevention mechanism for manual transmission - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a reverse miss shift prevention mechanism for a manual transmission.

(Prior Art) In a manual transmission in which a desired shift speed is selected by the operation of a selector, the selector performs a movement in a select direction and a movement in a shift direction orthogonal to the movement in the select direction. ing. More specifically,
For example, if the selector in the neutral position is once selected to the left and then shifted to the rear, the first speed is selected, and if it is shifted to the front, the second speed is selected. In such a manual transmission, a guide plate for guiding the above-described select movement and shift movement of the selector is provided. This guide plate, of course,
It has a select guide groove extending in the select direction and a plurality of shift guide grooves extending in the shift direction, each of which extends in a direction orthogonal to the select guide groove. When the selector is engaged with any shift guide groove. Then, the gear stage corresponding to the engaged shift guide groove is selected.

By the way, in the manual transmission, the reverse gear is selected when the selector is shifted from a certain select position to the front, for example, because of the relation of the gears.
When the vehicle is shifted to the rear, many of the gears are set to the forward speed (which is often the highest speed). In other words, there are many cases where one of the pair of shift guide grooves located on the same straight line is used for selecting the forward shift speed and the other is used for selecting the reverse shift speed. In such a case, when the selector is operated to shift down during forward traveling at the forward shift speed corresponding to the one shift guide groove, the selector is erroneously engaged with the other shift guide groove. It is conceivable that the reverse gear is selected.

In order to avoid a situation in which the reverse gear is erroneously selected during the forward traveling, as shown in U.S. Pat.No.4633728, the guide plate is reversely regulated to a certain degree. A device provided with a gate plate has been proposed.

What is described in this U.S. patent specification has the following configuration and operation (the reference numerals in parentheses in the following description are the reference numerals used in the U.S. patent specification). Indicates). First, in the guide plate (10), the forward shift guide groove (5), which is on the same straight line as the reverse shift guide groove (R), is used for the fifth speed.
On the other hand, the reverse gate plate (12) is swingably supported by the support pin (16) in the select direction, and the long hole (48) through which the support pin (16) penetrates is provided with the reverse gate plate (12). It is slidable along the elongated hole (48) by being formed. Further, the reverse gate plate (12) has a pressure receiving portion facing the selector (20) at the neutral position at a predetermined position thereof,
It has a restricting portion (50) facing the selector (20) in the shift guide groove (5) for the fifth speed. Further, the reverse gate plate (12) includes a spiral spring (1) installed on the guide plate (10) and the reverse gate plate (12).
The reverse gate plate (12) is urged to the predetermined position by 4) and is formed on the reverse gate plate (12) to prevent the reverse gate plate (12) from rotating more than a predetermined amount by the urging force of the spring (14). The finger portion (46) and the lug (13) provided on the guide plate (10) are brought into contact with each other. The support pin (16) is located closer to the backward shift guide groove (R) than the regulation portion (50) located at the predetermined position.

In such a structure, the following operations are performed. That is, when the selector (20) is selectively moved from the neutral position toward the intersection, the pressure receiving portion is pressed by the selector (20) and the reverse gate plate (12) is supported so as to escape from the intersection. It is swung about the pin (16). As a result, the selector (20) can arbitrarily select either the reverse shift speed or the fifth speed. Also, selector (20)
When is linearly displaced from the fifth speed shift guide groove (5) toward the reverse shift guide groove (R), the selector (20) is brought into contact with the restricting portion (50). At this time, the reverse gate plate (12) receives a pressing force toward the backward shift guide groove (R) from the selector (20) in contact with the restriction portion (50), and the elongated hole (48). ) And a selector (20) is moved by performing a combined motion in which the finger (46) and the lug (13) are swung toward the neutral position with the contact portion between the finger (46) and the lug (13) as a fulcrum. )
While the engagement with the reverse shift guide groove (R) is prevented, the selector (20) is displaced in the neutral position direction while receiving the guide toward the fourth speed shift guide groove (4). Then, during the combined exercise, the finger portion (46)
The contact position with respect to the lug (13) is gradually changed.

(Problems to be Solved by the Invention) However, according to the one described in the above-mentioned U.S. Pat. Therefore, the movement of the reverse gate plate is not stable, so that there is a limit in reliably preventing a misshift while surely performing a shift to a desired gear.

Therefore, an object of the present invention is to provide a reverse misshift prevention mechanism for a manual transmission, which can prevent misshifts more reliably, on the assumption that a reverse gate plate is attached to a guide plate. It is in.

(Means and Actions for Solving Problems) In order to achieve the above-mentioned object, the invention of claim (1) has the following configuration. That is, it is provided with a guide plate having a select guide groove and a plurality of shift guide grooves that are continuous in a direction orthogonal to the select guide groove, and the selector plate is engaged with the shift guide groove by engaging the selector with the shift guide groove. In a manual transmission in which a shift speed corresponding to a shift guide groove is selected, and one of a pair of shift guide grooves located on the same straight line is used for selecting a forward shift speed and the other is used for selecting a reverse shift speed. The reverse gate plate is supported by the support pin so as to be swingable in the select direction with respect to the guide plate, and a long hole through which the support pin penetrates is formed in one of the guide plate and the reverse gate plate. Is slidable in the shift direction by the reverse gate plate when in a predetermined position,
A pressure receiving portion that is located near an intersection of each of the select guide groove and the pair of shift guide grooves, and is brought into contact with the selector when the selector in the neutral position is displaced toward the intersection; A selector in one shift guide groove and a restricting portion with which the selector comes into contact when the selector is displaced toward the other shift guide groove, wherein the reverse gate plate swings in the select direction and By sliding in the shift direction, it is possible to move both from the predetermined position to the direction in which the pressure receiving portion is pressed by the selector from the neutral position and in the direction in which the restricting portion is pressed by the selector from the one shift guide groove. The reverse gate plate includes a first spring for urging the shift direction and a second spring for urging the select direction. A ring is urged to reach the predetermined position, the support pin is positioned closer to the one shift guide groove side than the regulating portion at the predetermined position, and the elongated hole is the pair of shift guide grooves. It is located on the extension line, and is configured as a reverse miss shift prevention mechanism for a manual transmission.

In such a configuration, the reverse gate plate that slides in the shift direction and swings in the select direction is
Since a special spring adapted to this movement is biased to a predetermined position, the reverse gate plate operates stably, and as a result, the desired shift selection is ensured and the misshift is ensured. Can be prevented more reliably.

Further, since the position of the support pin is located closer to the one shift guide groove side than the restriction portion located at the predetermined position, the following action is brought about.

Explaining this point in detail, when the support pin is positioned closer to the backward shift guide groove than the restricting portion as in the above-mentioned US patent specification, the backward shift guide groove from the selector is used. When the reverse gate plate is displaced toward the shift guide groove, the reverse gate plate receives a pressing force in the buckling direction toward the support pin, and therefore tends to be bent in the plate thickness direction or inclined to the support pin, As a result, abrasion is likely to occur, causing a problem in terms of durability, and the movement of the reverse gate plate becomes unstable, which is also unfavorable for surely preventing reverse misshift.

However, by setting the position of the support pin as described above, the reverse gate plate receives a force in the pulling direction with respect to the support pin by the selector,
It is even more advantageous in ensuring durability and stable movement of the reverse gate plate.

Further, since the elongated hole is located on the extension line of the pair of shift guide grooves, no power is applied to the reverse gate plate from the selector at any time during reverse misshift prevention, and the reverse gate plate is not reversed. The operation of the gate plate is only linear movement. Therefore, when preventing reverse misshift, it is not necessary to provide a special means for restricting the rotation, and it is even more advantageous in ensuring the smooth operation of the reverse gate plate.

In order to achieve the above-mentioned object, in the invention of claim (2), the guide plate according to claim (1) is formed with a guide surface extending parallel to the pair of shift guide grooves. The reverse gate plate is formed with an abutting portion that comes into contact with the guide surface by the urging force of the second spring when the reverse gate plate slides in the shift direction. .

With the above-described configuration, the contact portion is guided by the guide surface in addition to the same effect as that of the above-described claim (1). Therefore, the reverse gate plate can be operated more smoothly.

Further, in order to achieve the above-mentioned object, in the invention of claim (3), in the invention of claim (1), the one shift guide is provided as the restricting portion moves in the urging direction of the second spring. It is configured as an inclined surface that inclines toward the groove.

With the above configuration, it is possible to reliably prevent a situation in which the selector is disengaged from the restriction portion when the restriction portion is pressed by the selector. Therefore, also from this, it is possible to prevent the misshift to reverse with higher reliability.

(Embodiment) In FIG. 1, a change rod 1 is rotatably and slidably held in a casing C of a transmission. A proximal end portion of a selector 2 is pin-connected to the change rod 1, and the selector 2 is operated to select a desired shift speed. This selector 2
2 to 5 are as follows: 1st gear, 2nd gear, 3rd gear, 4th gear, 5th gear, and R for reverse gear (reverse gear) ). That is, the selector 2 in the neutral position (indicated by N), which constitutes one of the select positions, is selected by shifting the selector 2 to the rear, and is selected by shifting the selector 2 to the front (change in response to the shift movement). Rod 1 is slid). Also, selector 2
Is moved from the neutral position N to the select direction which is, for example, the vehicle width direction, whereby the change rod 1 is rotated or becomes the first select position S1 at which the change rod 1 can be selected. By shifting 2 forward, is selected, and by shifting backward 2 is selected. further,
By moving the selector 2 in the neutral position N toward the side opposite to the first select position S1, the second select position S2 is obtained. By shifting the selector 2 forward from the second select position S2, R is selected. Is selected and is selected by shifting to the rear.

Referring again to FIG. 1, the casing C has a pair of bearings 3
And a guide plate 5 is fixed to the pair of support portions 3 with bolts 4. As is well known, the guide plate 5 is for guiding the select movement and the shift movement of the selector 2. That is, as shown in FIGS. 2 to 5, a selector guide groove 6 is provided for guiding the selector 2 so as to be selectable between the first select position S1 and the second select position S2, In addition, a total of six shift guide grooves 7-1, 7-2, 7-3, 7 corresponding to the forward gears and the reverse gears of R.
-4, 7-5 and 7-R. Each of the shift guide grooves 7-1 to 7-5 and 7-R is independently and continuously connected to the select guide groove 6 at right angles. In between, 7-1 and 7-2 are on the same straight line, 7-3 and 7
-4 is on the same straight line, and 7-5 and 7-R are on the same straight line.

A reverse misshift prevention mechanism A is attached to the upper surface of the guide plate 5. The prevention mechanism A directly moves from the shift guide groove 7-5 for the fifth speed in order to prevent the selector 2 from being excessively moved linearly and excessively, so that the reverse gear is erroneously selected during the forward traveling. It is intended to prevent the selector 2 from being largely displaced to the reverse (reverse) shift guide groove 7-R.

The prevention mechanism A includes a reverse gate plate 11. The reverse gate plate 11 has a predetermined position as shown in FIG. As clearly shown in FIG. 3, the reverse gate plate 11 is formed with a long hole 12 extending in the shift guide grooves 7-5 and 7-R direction at the predetermined position, and the guide plate 5 has a circular hole. 13 are formed. The reverse gate plate 11 is swingable around the circular hole 13 with respect to the guide plate 5 by the support pin 14 penetrating the elongated hole 12 and the circular hole 13 and has a length range of the elongated hole 12. It is slidable over. The support pin 14 (hole 13) has a reverse shift guide groove 7-
It is located on the opposite side of R and has both shift guide grooves 7-5,
It is located on the same straight line as 7-R. Further, at the predetermined position, the long hole 12 is formed in the both shift guide grooves 7-5,
It is formed so as to extend on the same straight line as 7-R.

A hole 15 is formed in the guide plate 5 near the hole 13, and a spiral first spring 17 is wound around a support pin 16 press-fitted into the hole 15. One end 17a of the first spring 17 is fitted into a long hole-like locking hole 18 formed in the guide plate 5, while the other end 17b is formed.
Is in contact with the end surface of the guide plate 5. As a result, the reverse gate plate 11 has the first spring 17
Is urged in the direction of arrow X in FIG.

In addition, the support pin 14 has a second spiral spring 19
Is wound. The second spring 19 has its one end 19a abutted against the end surface of the guide plate 5, and
The other end 19b is in contact with the end surface of the reverse gate plate 11. By such a second spring 19, the reverse gate plate 11 is biased in the clockwise direction in FIG. 2, that is, in the direction indicated by the arrow Y in FIG. 2, and the biasing direction is from the second select position S2 to the first select position S2. The direction is toward the position S1.

The other end 19b of the second spring 19 is also in contact with the end face of the guide plate 5 at the predetermined position shown in FIG. 2 (see comparison between FIG. 4 and FIG. 5). As a result, when the reverse gate plate 11 slides with respect to the guide plate 5 in the predetermined position shown in FIG. 2, the other end portion 19b does not have a sliding resistance as much as possible.

With the first and second springs 17 and 19 described above,
The reverse gate plate 11 is at the predetermined position shown in FIG. 2 unless an external force acts, and at this predetermined position, the support pin 14 is located at the left stroke end of the elongated hole 12 in FIG. 2, in other words, the reverse gate plate. 11 is the right stroke end position in FIG. 2 with respect to the guide plate 5.

The guide plate 5 is formed with a guide surface 5a extending parallel to the shift guide grooves 7-R and 7-5 in the vicinity of the support pin 16, while the reverse gate plate 11 is abutted against the guide surface 5a. The portion 11a is formed. And
The contact portion 11a is brought into contact with the guide surface 5a by the urging force of the second spring 19. As a result, the reverse gate plate 11 is smoothly displaced in the shift direction with respect to the guide plate 5.

The reverse gate plate 11 has a corner portion 21 which is formed at a substantially right angle, a surface forming one side of the corner portion 21 is a pressure receiving portion 21a, and a surface forming the other side is a regulating portion 21b.
When the reverse gate plate 11 is in the predetermined position, the corner portion 21 has the select guide groove 6 and the shift guide groove 7-.
It is located near the intersection of 5 and 7-R, that is, near the second select position S2. More specifically, the pressure receiving portion 21a is
The selector 2 is located slightly closer to the neutral position N side than the second select position S2 to face the selector 2 in the neutral position N, and the selector 2 is selected from the neutral position N toward the second select position S2. When the selector 2 is operated, the selector 2 is contacted (see FIG. 4).
Further, the restricting portion 21b is slightly 5 degrees from the second select position S2.
When the selector 2 located at the position closer to the speed shift guide groove 7-5 and displaced in the fifth speed shift guide groove 7-5 is displaced toward the reverse shift guide groove 7-R, the second select Immediately before reaching the position S2, the selector 2 is contacted.

Next, the operation of the above configuration will be described with reference to FIGS.
This will be described with reference to FIGS.

First, when the selector 2 is in the neutral position N, the reverse gate plate 11 is in the predetermined position shown in FIG.

From the state shown in FIG. 2, select the selector 2 to the second select position S2.
When the selector is moved toward, the selector 2 eventually comes into contact with the pressure receiving portion 21a. After this abutment, the reverse gate plate 11 is rotated around the pin 14 as shown in FIG. 4 under the pressing force caused by the selection movement from the selector 2, and the selector 2 is moved to the second selection position. Reach S2. After that, the selector 2 can be arbitrarily shifted in either of the shift guide grooves 7-5 or 7-R without being disturbed by the reverse gate plate 11. In this way, from the neutral position N, the selection of the fifth speed and the selection of the reverse gear are freely performed.

Consider the case where the selector 2 is shifted to the fifth speed shift guide groove 7-5 from the state of FIG. If the selector 2 is linearly displaced from this state (the reverse gate plate 11 is at a predetermined position) toward the reverse shift guide groove 7-5, the selector 2 is restricted immediately before reaching the second select position S2. It contacts the portion 21b. In response to the pressing force directed to the reverse shift guide groove 7-R of the selector 2, the reverse gate plate 11 linearly moves forward by the length range of the long hole 12 as shown in FIG. After being displaced, the selector 2 is moved to the second select position S2. However, after the selector 2 is positioned at the second select position S2, even if the selector 2 is further pushed toward the reverse shift guide groove 7-R, the reverse gate plate 11 shifts the reverse shift further. It cannot be displaced toward the guide groove 7-R side. As a result, reverse misshift which would directly select the reverse gear from the fifth speed is prevented.

Of course, the 5th selector 2 is in the 2nd selection position S2
From the state shown in the figure, the selector 2 can be displaced toward the neutral position N. Then, in this neutral position N, all the shift speeds can be selected without being disturbed by the reverse gate plate 11.

Here, the reverse gate plate 11 is the first spring.
While receiving the biasing force in the direction of arrow X by 17 and the force of the second spring 18 in the direction of arrow Y, the operation is smoothly performed, and the misshift is surely prevented, and the risk of this misshift may occur. The shift to the desired gear is surely performed when there is no.

Further, as in the embodiment, the position of the support pin 14 is set on the opposite side of the reverse guide groove 7-R with the fifth speed guide groove 7-5 interposed therebetween, thereby preventing reverse misshift. Is
Depending on the pressing force from the selector 2, the reverse gate plate 11 receives a tensile force at the portion between the support pin 14 and the restriction portion 21b, but does not receive a force in the buckling direction.
As a result, the reverse gate plate 11 does not bend in the plate thickness direction or tilt with respect to the support pin 14,
It will operate smoothly to the position shown. In particular,
As in the embodiment, if the support pin 14 (long hole 12) is positioned on the same straight line as both the shift guide grooves 7-5 and 7-R, the reverse gate plate can be prevented when the reverse misshift is prevented. Since the selector 2 does not receive power from the selector 2 any number of times, it is not necessary to provide any special means for restricting the rotation, and the reverse gate plate
The operation of 11 is only a linear movement, which is even more advantageous in ensuring the smooth operation. In addition to this, the guide action of the contact portion 11a by the guide surface 5a allows the reverse gate plate 11 to operate more smoothly to the state shown in FIG.

Although the embodiment has been described above, the elongated hole 12 may be provided on the guide plate 5 side. In this case, at a predetermined position of the reverse gate plate 11, the support pin 14 makes the rear stroke end of the contact elongated hole ( It is located at the stroke end on the right side in FIG.

Here, as shown in FIG. 5, when the restricting portion 21b is pressed by the selector 2, the selector 2 causes the restricting portion 21b to move.
In order to surely prevent such a situation that it comes off, the restricting portion 21b may be an inclined surface having an angle θ, as shown in FIG. That is, the select guide groove 6
When the extending direction of is shown as l, the restricting portion 21b is inclined by θ (about 1 to 3 °) with respect to this l, that is, as the second spring 19 is biased ( It is advisable to incline the inclined surface 21b toward the shift guide groove 7-5 as it goes to the first select position S1).

It is desirable that the above-mentioned prevention mechanism A be performed by previously assembling the guide plate 5 and then fixing the guide plate 5 to the casing C.

(Effect of the Invention) As described above, in the inventions of claims 1 to 3, it is possible to more surely prevent the misshift while ensuring that the desired shift selection is surely performed, and the durability and reverse This is more advantageous in ensuring stable movement of the gate plate, and further, in the case of reverse misshift prevention, it is not necessary to provide special means for restricting rotation, and the smoothness of the reverse gate plate is eliminated. This can be more advantageous in ensuring proper operation.

According to the second aspect of the invention, the reverse gate plate can be operated more smoothly based on the guiding action of the contact portion by the guide surface.

According to the third aspect of the present invention, it is possible to reliably prevent a situation in which the selector is disengaged from the restriction portion, and therefore it is possible to prevent the misshift to reverse with even higher reliability.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, and FIG.
Side sectional drawing which follows the line. 2, 4, and 5 are plan views showing the operating state of the reverse misshift prevention mechanism of this embodiment. FIG. 3 is an exploded plan view of FIG. FIG. 6 is a plan view of essential parts showing a preferred example of a portion where a pressure receiving portion and a regulating portion of the reverse gate plate are formed. 2: Selector 5: Guide plate 5a: Guide surface 6: Select guide groove 7-1 to 7-5: Shift guide groove (for forward movement) 7-R: Shift guide groove (for backward movement) 11: Reverse gate plate 11a: Contact Contact part 12: Long hole 13: Hole 14: Support pin 17: First spring 19: Second spring 21: Corner part 21a: Pressure receiving part 21b: Restriction part θ: Inclination angle

Claims (3)

[Scope of utility model registration request] 1. A guide plate having a select guide groove and a plurality of shift guide grooves, each of which extends in a direction orthogonal to the select guide groove. The guide plate is provided with the selector plate by engaging the selector with the shift guide groove. A shift speed corresponding to the combined shift guide groove is selected, and one of a pair of shift guide grooves located on the same straight line is used for forward shift speed selection and the other is used for reverse shift speed selection. In the transmission, the reverse gate plate is supported by the support plate so as to be swingable in the select direction with respect to the guide plate, and an elongated hole through which the support pin penetrates is formed in one of the guide plate and the reverse gate plate. By being slidable in the shift direction, the reverse gate plate is in a predetermined position,
A pressure receiving portion that is located near an intersection of each of the select guide groove and the pair of shift guide grooves, and is brought into contact with the selector when the selector in the neutral position is displaced toward the intersection; A selector in one shift guide groove and a restricting portion with which the selector comes into contact when the selector is displaced toward the other shift guide groove, wherein the reverse gate plate swings in the select direction and By sliding in the shift direction, it is possible to move both from the predetermined position to the direction in which the pressure receiving portion is pressed by the selector from the neutral position and in the direction in which the restricting portion is pressed by the selector from the one shift guide groove. The reverse gate plate includes a first spring for urging the shift direction and a second spring for urging the select direction. A ring is urged to reach the predetermined position, the support pin is positioned closer to the one shift guide groove side than the regulating portion at the predetermined position, and the elongated hole is the pair of shift guide grooves. Reverse misshift prevention mechanism for manual transmissions, characterized by being located on the extension line. 2. The guide surface according to claim 1, wherein the guide plate is formed with a guide surface extending in parallel with the pair of shift guide grooves, and the reverse gate plate is slidable in the shift direction by the reverse gate plate. An abutting portion that is abutted against the guide surface by the urging force of the second spring when being performed. 3. The restricting portion according to claim 1, wherein the restricting portion is an inclined surface that inclines in a direction approaching the one shift guide groove as it extends in a biasing direction of the second spring.