JP5344185B2 - Transmission - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a transmission device applicable to a transmission equipped with two arm parts as a shifting member of a gear shift mechanism capable of precluding an erroneous actuation of shift lugs other than those actuated by the shifting member. <P>SOLUTION: The transmission device has a shift finger 56 consisting of two arm parts swinging round the axis of a shift shaft 50 installed in such a manner as straddling the shift lugs 40a-40d in the shift direction and extending in the select direction and performs speed changing by moving the shift finger 56 in the select and shift directions and moving the shift lugs 40a-40d in the shift direction selectively by pressing them, wherein an interlock preventive member 70 is further installed which moves in the select direction together with the shift finger 56, is inserted between the shift lugs 40a-40d in the shift position and the shift lugs 40a-40d in the neutral position, except the position in the select direction of the shift finger 56, and restricts movement to the shift position of the shift lugs 40a-40d in the neutral position. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a mechanical automatic transmission.

  2. Description of the Related Art A mechanical automatic transmission that does not use a torque converter is known as a vehicle transmission. In this mechanical automatic transmission, an automatic transmission that does not require a torque converter is made possible by operating a transmission operation (selection and shift) and a clutch connection / disconnection in a manual transmission with an actuator. The transmission includes, for example, a shift shaft that can be moved by sliding or rotating in the select direction and the shift direction, a plurality of shift lugs arranged in the select direction, and a shift rail that connects the shift lugs and the shift forks. Yes. Further, the shift shaft is provided with a shift finger (shift member) protruding outward, and each shift lug is provided with one column portion. The shift finger is constituted by a bifurcated arm portion, and the two arm portions are disposed so as to straddle the column portion in the shift direction. Then, for example, by moving the shift shaft in the select direction and the shift direction with an electric motor, the shift lug pillar portion is selectively pushed in one arm portion of the shift finger and moved in the shift direction, so that the shift fork is selectively moved. A shift operation is performed (Patent Document 1).

On the other hand, in the manual transmission, a plurality of shift lugs are arranged close to the select direction to improve operability. An interlock preventing member is provided for restricting the movement of the shift lugs other than the gear shift operated so that adjacent shift lugs are not simultaneously shifted by the shift fingers.
Further, even in a mechanical automatic transmission device having a shift mechanism that moves a shift finger in a select direction and a shift direction and selectively moves a plurality of shift lugs, a shift lug other than a desired shift lug is not shifted. A technique including an interlock prevention member (interlock prevention plate) has been developed. (Patent Document 2).

Japanese Patent No. 4285580 JP 2006-2789 A

The interlock prevention member employed in the manual transmission device has a structure that holds the shift lug other than the one to be shifted in a neutral state. It cannot be adopted in a dual clutch transmission that has the opportunity to shift at the same time.
On the other hand, although the transmission disclosed in Patent Document 2 can be adopted in a dual clutch transmission, a pair of shift lugs are formed in a U shape and aligned with one shift lug in the shift direction. The shift finger pushes the pair of column portions from the inside to move the shift lug in the shift direction.

  Therefore, even in the same dual clutch transmission, the structure of the gear shift mechanism is different between Patent Document 1 and Patent Document 2, so that the shift finger is constituted by a bifurcated arm portion as in Patent Document 1. The interlocking prevention member described in Patent Document 2 cannot be used as it is in a transmission equipped with a gear shift mechanism, and the interlocking prevention member is required even in a transmission having such a structure. Yes.

  The present invention has been made to solve such a problem, and can be employed in a transmission apparatus having two arm portions as a shift member of a gear shift mechanism, and a shift lug other than that operated by the shift member. It is an object of the present invention to provide a transmission that can prevent malfunctions.

In order to achieve the above object, the invention of claim 1 is characterized in that a shift member movable in the select direction and the shift direction, a shift lug formed in a column shape and arranged in the select direction, and a shift lug connected to the shift lug through the shift rail. A shift fork that performs a shift operation of the shift stage, and the shift member is moved in the selection direction and the shift direction, and the shift lug is selectively pressed in the shift direction to move between the neutral position and the shift position. In a transmission that shifts a shift fork via a shift rail, the shift member is composed of two arm portions that protrude radially outward from a shift shaft that extends in the select direction, and the two arm portions are shift lugs. Is moved across the shift direction and moved in the select direction together with the shift member. Inserted between the shift lag at the neutral position and the shift lag at the shift position except for the position in the select direction of the screen section, and moves the shift lag at the neutral position except for the position in the select direction of the shift finger to the shift position. The shift lug is provided with a regulating interlock member for regulating , and the shift lug is provided with a convex portion whose thickness in the shift direction is different from the pressing portion pressed by the shift member at the tip, and the interlock preventive member abuts on the convex portion to shift the shift lug It is characterized by restricting the movement of .

The invention according to claim 2 is that in claim 1, the interlock prevention member is set to have a thickness in the shift direction so that movement of the shift lug at the shift position to the neutral position is restricted. Features .

  According to the transmission of the first aspect of the present invention, the interlock preventing member is inserted between the shift lug at the shift position and the shift lug at the neutral position except for the position of the shift member in the select direction. Movement of the shift lug at the neutral position other than the shift lug pressed by the shift member to the shift position is restricted. Therefore, malfunction of the shift lugs other than those shifted by the shift member can be prevented, and the reliability of the transmission can be improved.

Further, since the interlock prevention member moves in the select direction and is inserted between the shift lug in the shift state and the shift lug in the neutral position, the shift member is moved in the select direction while keeping one shift lug in the shift state. And it can be moved in the shift direction and the other shift lugs can be shifted. Therefore, the present invention can also be applied to a dual clutch transmission.
In addition, since the convex portion with which the interlock prevention member abuts is set so that the thickness in the shift direction is different from the pressing portion pressed by the shift member, the shift direction between the neutral position and the shift position of the shift lug is set. It is possible to insert the interlock preventing member between them at least relatively without affecting the operation of the shift lug by the shift member. In addition, it is possible to set the thickness in the shift direction of the pressing portion of the shift lug without being affected by the convex portion, which is advantageous in terms of strength. Further, since the position in the shift direction where the shift member abuts against the shift lug and the position in the shift direction where the interlock prevention member abuts are different, the operation of the shift lug by the shift member and the movement restriction of the shift lug by the interlock prevention member However, it can be set to be executed at an appropriate timing, and the design of the arrangement of the interlock prevention member and the shift member can be facilitated.

In the invention of claim 2, since the interlock preventing member restricts the shift lug in the shift position to the neutral position, the shift lug in the shift state can be prevented from coming off .

It is a schematic diagram of the transmission part of the dual clutch transmission of 7 forward speeds and 1 reverse speed as one embodiment of the present invention. It is a perspective view which shows a partial structure of the gear shift mechanism which concerns on one Embodiment of the transmission of this invention. It is a front view which shows a partial structure of the gear shift mechanism. It is a side view which shows a partial structure of the gear shift mechanism. It is explanatory drawing explaining the detailed structure of an interlock prevention member, Comprising: A) is a top view, B) is a side view.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic diagram of a transmission unit 1 of a dual clutch transmission as an embodiment of the present invention.
As shown in FIG. 1, the transmission unit 1 includes two clutches 2 and 3, two main shafts 4 and 5 arranged on the same axis, and three sub shafts 6, 7 and 8. ing. The first main shaft 4 receives power from the engine output shaft 9 via the first clutch 2, while the second main shaft 5 receives power from the output shaft 9 via the second clutch 3. It is comprised so that.

  The first auxiliary shaft 6, the second auxiliary shaft 7 and the third auxiliary shaft 8 are arranged so as to be separated from each other so that the first main shaft 4 and the second main shaft 5 are parallel to the axis. It is configured to be able to transmit power to the differential 10 at the rear stage of the transmission unit 1. A first-speed fixed gear 11 a, a third-speed fixed gear 13 a, and a fifth-speed fixed gear 15 a are fixed to the first main shaft 4 so as to rotate integrally with the first main shaft 4. A fixed gear 12a for 2nd speed and reverse 12a and a fixed gear 14a for 4th speed and 6th speed are fixed to the second main shaft 5 so as to rotate integrally with the second main shaft. The first countershaft 6 includes a first-speed idler gear 11b, a second-speed idler gear 12b, a fourth-speed idler gear 14b, and a fifth-speed idler gear 15b. 6 is pivotally supported so as to be relatively rotatable. The second countershaft 7 is pivotally supported by a third speed idler gear 13b, a sixth speed idler gear 16b, and a reverse intermediate idler gear 18b so as to be rotatable relative to the second countershaft 7. Yes. A reverse idle gear 18 c is pivotally supported on the third countershaft 8 so as to be rotatable relative to the third countershaft 8.

  With such a gear arrangement, the first-speed fixed gear 11a and the first-speed idle gear 11b constitute the first-speed gear 11, and the second-speed and reverse fixed gear 12a and the second-speed idle gear 12b are two. The 3rd speed fixed gear 13a and the 3rd speed idle gear 13b constitute the 3rd speed gear 13, and the 4th and 6th speed fixed gear 14a and the 4th speed idle gear 14b constitute the high speed gear 12. The 4-speed gear 14 is configured, and the 5-speed fixed gear 15a and the 5-speed idle gear 15b constitute the 5-speed gear 15, and the 4-speed and 6-speed fixed gear 14a and the 6-speed idle gear 16b 6 constitutes the 6-speed gear 16, and the reverse gear 18 is constituted by the second-speed and reverse fixed gear 12a, the reverse intermediate idle gear 18b, and the reverse idle gear 18c.

  The transmission unit 1 is provided with synchro sleeves 201, 211, 221, 231, 241 and shift forks 20 to 24, and the synchro sleeves 201, 211, 221, 231, 241 are provided with shift forks 20 to 24. Is slid along the axis of each sub-axis. Among them, the first sync sleeve 201 and the second sync sleeve 211 are installed so as to be slidable along the axis of the first countershaft 6, and are slid by the shift fork 20 and the shift fork 21, respectively. . The third sync sleeve 221 and the fourth sync sleeve 231 are slidably installed along the axis of the second countershaft 7 and are slid by the shift fork 22 and the shift fork 23, respectively. The fifth sync sleeve 241 is slidably installed along the axis of the third countershaft 8 and is slid by the shift fork 24.

  By sliding these sync sleeves 201, 211, 221, 231, 241, the 1st speed gear 11 and the 5th speed gear 15 are moved by the first synchro sleeve 201, and the 2nd speed gear 12 is moved by the second synchro sleeve 211. The 4-speed gear 14 can be selectively connected and disconnected (shifted) to the countershaft 6, the third-speed gear 13 is provided by the third synchronization sleeve 221, and the sixth-speed gear is provided by the fourth synchronization sleeve 231. 16 can be selectively connected (shifted) to the auxiliary shaft 7 respectively. Further, the reverse gear 18 can be selectively connected to the countershaft 8 (shift operation) by the fifth sync sleeve 241.

That is, in the transmission section 1 of the dual clutch transmission, the first clutch 2 can be selectively switched to the first speed, the third speed, and the fifth speed, while the second clutch 3 is used for the second speed. It is configured to be selectively switchable between the 4th speed, 6th speed and reverse.
Next, a gear shift mechanism for driving the shift forks 20 to 23 of the dual clutch transmission to which the transmission of the present invention is applied will be described with reference to FIGS.

FIG. 2 is a perspective view showing a configuration of a gear shift mechanism according to an embodiment of the transmission of the present invention. FIG. 3 is a front view showing the configuration of the gear shift mechanism, and FIG. 4 is a side view showing the configuration of the gear shift mechanism.
The shift forks 20 to 23 are fixed to shift rails 30a to 30d provided to be movable in the shift direction. As shown in FIGS. 2 to 4, shift lugs 40 a to 40 d are provided on the shift rails 30 a to 30 d. The shift lugs 40a to 40d are columnar members extending from the shift rails 30a to 30d.

The shift lugs 40a to 40d are arranged at intervals on the same line extending in the select direction in each gear stage non-connected state (neutral). Specifically, a first shift lug 40a, a second shift lug 40b, a third shift lug 40c, and a fourth shift lug 40d are arranged in order from the left in FIG.
A shift shaft 50 extending in the select direction is provided along the direction in which the shift lugs 40a to 40d are arranged at the neutral position in the protruding direction of the shift lugs 40a to 40 (upward in FIG. 4).

  The shift shaft 50 includes a central shaft 52 that is fixed to the casing 51 and extends in the select direction, and a cylindrical shift sleeve 53 and a select sleeve 54. The shift sleeve 53 has a central shaft 52 inserted therein, and is supported so as to be movable and rotatable in the axial direction with respect to the central shaft 52. A shift finger 56 (shift member) is fixed to the shift sleeve 53. The shift finger 56 includes two arm portions 56 a and 56 b that protrude from the outer peripheral wall of the shift sleeve 53 radially outward with a predetermined sandwich angle.

  The select sleeve 54 has a shift sleeve 53 inserted therein and is supported so as to be rotatable with respect to the shift sleeve 53. The select sleeve 54 is provided with an opening 57 through which the shift finger 56 passes. The opening 57 has a shape extending in the circumferential direction so that the shift finger 56 can swing with respect to the select sleeve 54. The width of the opening 57 in the select direction is substantially the same as the width of the shift finger 56 in the select direction so that the shift finger 56 can rotate with respect to the select sleeve 54 and the movement in the select direction is restricted. Is set. A long hole 59 extending in the select direction is provided in the outer peripheral wall on the upper side of the select sleeve 54, and the tip of a rotation regulating pin 60 fixed to the casing 51 is inserted into the long hole 59. Therefore, although the select sleeve 54 is allowed to move in the select direction with respect to the casing 51, the select sleeve 54 is restricted from moving in the rotational direction. Further, the select sleeve 54 and the shift sleeve 53 are configured to be movable in the select direction with respect to the central shaft 52 as a unit.

  The select sleeve 54 is moved in the select direction by an actuator (not shown) via, for example, a rack and pinion power transmission mechanism. The shift sleeve 53 is rotationally driven by an actuator (not shown) via a power transmission mechanism including, for example, a worm wheel and a worm shaft, or a power transmission mechanism using a combination of a spur gear, a bevel gear, and the like. Then, by controlling the operation of these actuators, the shift sleeve 53 is moved together with the select sleeve 54 in the select direction, and the position of the shift finger 56 in the select direction with the shift lugs 40a to 40d of a desired gear stage is matched. The shift finger 53 is swung by rotating the shift sleeve 53, and the shift lugs 40a to 40d are selectively pushed and moved in the shift direction at the tip thereof to perform a shift.

Furthermore, in this embodiment, the interlock prevention member 70 is provided so that shift lugs 40a-40d other than what is pressed by the shift finger 56 may not move.
The interlock prevention member 70 is composed of two plate-like members provided so as to protrude downwardly from the outer peripheral wall of the select sleeve 54 in the shift direction, and a shift lug having a lower end portion in a neutral position. It arrange | positions so that the front-end | tip of 40a-40d may be pinched | interposed.

  The interlock prevention member 70 is provided with a notch 71 so as not to prevent the shift finger 56 from swinging. The interlock preventing member 70 is selected around the notch 71 so that all the other shift lugs 40a to 40d are sandwiched with the shift finger 56 being in the selection direction with any of the four shift lugs 40a to 40d. Extending in the direction.

FIG. 5 is an explanatory view for explaining the detailed structure of the interlock preventing member 70, wherein A) is a schematic view of the gear shift mechanism viewed from above, and B) is a side view of the gear shift mechanism. In addition, this figure has shown the case where the shift lug 40b exists in a shift position.
As shown in FIG. 5, convex portions 72a to 72d projecting upward are formed at the ends of the shift lugs 40a to 40d. The convex portions 72a to 72d are set so that the width in the shift direction is narrower than the base portions 73a to 73d (pressing portions) of the shift lugs 40a to 40d. Further, the interlock prevention member 70 has a downward projecting length so that the lower end portion can be brought into contact with the convex portions 72a to 72d without coming into contact with the base portions 73a to 73d. On the other hand, the protruding length of the shift finger 56 is set so that the tip of the shift finger 56 pushes the base portions 73a to 73d of the shift lugs 40a to 40d. The convex portions 72a to 72d of the four shift lugs 40a to 40d are set so as to be aligned on the straight line in the select direction in the neutral state, and further set so as to be aligned on the straight line even in the shift state.

  The thickness c in the shift direction of the interlock preventing member 70 is such that the projections (72a, 72c, 72d) of the shift lugs (40a, 40c, 40d in FIG. 5) at the neutral position and the shift lugs (40b in FIG. 5) at the shift position. ) Of the projection (72b). Specifically, assuming that the distance a in the shift direction between the neutral position of the shift lugs 40a to 40d and the shift position, the thickness b in the shift direction of the protrusions 72a to 72d, and the thickness c of the interlock prevention member 70 are neutral positions. The gap e when the interlock preventing member 70 is inserted between the convex portions 72a to 72d at the shift position and the convex portions 72a to 72d at the shift position is set as small as possible within the range where the following expression (1) is satisfied. Yes.

e = (a−b) −c> 0 (1)
The interlock preventing member 70 is disposed in the middle between the convex portions 72a to 72d at the neutral position and the convex portions 72a to 72d at the shift position. Specifically, the distance d in the shift direction from the neutral position of the interlock preventing member 70 is set as in the following equation (2).

d = a / 2 (2)
In other words, the interlock preventing member 70 has a position in the shift direction so that the shift lugs 40a to 40d at the neutral position do not move to the shift position and the shift lugs 40a to 40d at the shift position do not move to the neutral position. The thickness is set.

  In the present embodiment, the select sleeve 54 can be moved in the select direction without the interlock preventing member 70 interfering with the convex portions 72a to 72d of the shift lugs 40a to 40d at the neutral position or the shift position. Then, the shift finger 56 is moved relative to the shift lugs 40a to 40d to rotate, and the shift sleeve 53 is rotated, whereby the shift fingers 56 press the base portions 73a to 73d of the shift lugs 40a to 40d to move in the shift direction. At this time, movement of the other shift lugs 40a to 40d in the shift direction is restricted by the protrusions 72a to 72d coming into contact with the interlock preventing member 70.

  As described above, in this embodiment, the interlock prevention member 70 enters between the convex portions 72a to 72d of the shift lugs 40a to 40d at the neutral position and the convex portions 72a to 72d of the shift lugs 40a to 40d at the shift position. In particular, it has not only an interlock prevention function for restricting the movement of the shift lugs 40a to 40d at the neutral position, but also a gear drop prevention function for restricting the movement of the shift lugs 40a to 40d at the shift position. Further, the shift finger 56 can be moved in the select direction without the interference preventing member 70 interfering with the convex portions 72a to 72d of the shift lugs 40a to 40d at the shift position as well as the neutral position. The present invention can be applied to a dual clutch transmission that needs to shift another shift stage while the shift stage is shifted.

  Further, convex portions 72a to 72d having thicknesses different from those of the base portions 73a to 73d pressed by the shift finger 56 are provided at the tips of the shift lugs 40a to 40d, and the interlock preventing member 70 is provided on the convex portions 72a to 72d. Since the movement of the shift lugs 40a to 40d is restricted by contact, even if the distance a in the shift direction between the neutral position and the shift position is relatively short, the thickness of the shift lugs 40a to 40d is reduced. A space for allowing the interlock preventing member 70 to pass through can be ensured without causing a decrease. In addition, the interlock prevention member 70 is brought into contact with the convex portions 72a to 72d to restrict the movement of the shift lugs 40a to 40d, so that the shift lugs 56a to 40d start to move and the interlock prevention member 70. The movement restriction positions of the shift lugs 40a to 40d can be individually set, and the shape and arrangement design of the shift finger 56, the shift lugs 40a to 40d and the interlock prevention member 70 can be facilitated.

In the present embodiment, the present invention is applied to a transmission having one shift finger 56.
The present invention is also applicable to a transmission in which a plurality of shift fingers 56 are arranged in the select direction.
In the present embodiment, the present invention is applied to a mechanical automatic transmission device having a dual clutch. However, the present invention is also applicable to a single clutch mechanical automatic transmission device. Even in this case, it is possible to prevent malfunctions of the shift lugs other than those to be shifted.

1 Transmission part 20, 21, 22, 23, 24 Shift fork 40a, 40b, 40c, 40d Shift lug 56 Shift finger 70 Interlock prevention member 72a, 72b, 72c, 72d Protruding part 73a, 73b, 73c, 73d Base part 201, 211, 221, 231, 241 Synchro sleeve

Claims (2)

A shift member movable in the select direction and the shift direction;
Shift lugs formed in a columnar shape and arranged in the select direction; and
A shift fork connected to the shift lug via a shift rail and performing a shift operation of the shift stage,
The shift member is moved in the selection direction and the shift direction, the shift lug is selectively pressed in the shift direction to move between the neutral position and the shift position, and the shift fork is shifted through the shift rail. In the transmission to be operated,
The shift member is composed of two arm portions projecting radially outward from a shift shaft extending in the select direction, and the two arm portions are disposed so as to straddle the shift lug in the shift direction,
The shift lug that moves in the select direction together with the shift member and is inserted between the shift lug at the neutral position and the shift lug at the shift position except for the position of the arm portion in the select direction, and at the neutral position. An interlock preventing member for restricting movement of the shift position to the shift position ,
The shift lug comprises a pressing portion pressed by the shift member at the tip and a convex portion having a different thickness in the shift direction,
The said interlock prevention member contacts the said convex part, and controls the movement of the shift direction of the said shift lug, The transmission characterized by the above-mentioned .   2. The speed change according to claim 1, wherein the interlock prevention member has a thickness in the shift direction so that movement of a shift lug at the shift position to the neutral position is restricted. apparatus.

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