JP2013185699A - Neutral position detecting device for transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve accuracy in detecting a neutral position, in a neutral position detecting device for a transmission equipped with a locating mechanism and a position detecting mechanism.SOLUTION: A locating mechanism (23) and a position detecting mechanism (24) include: groove parts (34, 40), respectively, formed in the outer circumferential surface of a cam (25) mounted on a shift and select shaft (11), so as to extend in a direction parallel with a rotation axis (11C) of the shift and select shaft (11); and movable parts (35, 41) held in a transmission case (2) so as to enter and exit the groove parts (34, 40). The groove part (34) of the locating mechanism (23) and the groove part (40) of the position detecting mechanism (24) are arranged to overlap each other in a direction along the rotation axis (11C) of the shift and select shaft (11) on the single cam (25).

Description

  The present invention relates to a transmission neutral position detection device, and more particularly to a transmission neutral position detection device for detecting a neutral position in a manual transmission.

2. Description of the Related Art Some manual transmissions as transmissions mounted on vehicles perform a shift by moving a shift and select shaft in the axial direction and then rotating the shift and select shaft.
Such a transmission has a neutral position that includes a locating mechanism that positions the shift-and-select shaft in the neutral position in the rotational direction and a position detection mechanism that detects that the rotational position of the shift-and-select shaft is in the neutral position. A detection device is provided.

JP 2011-220449 A

  In the transmission position detection device for a transmission according to Patent Document 1, a shift and select shaft is rotatably disposed in a control case of the transmission case, and a cam that rotates integrally with the shift and select shaft is disposed in the control case. ing. A sensor that detects the rotational position of the shift-and-select shaft in contact with the cam and a detent mechanism that contacts the cam and positions the shift-and-select shaft in the rotational direction are arranged in the control case. The cam includes a cam portion that comes into contact with the tip portion of the sensor, and a groove portion that engages with the movable piece of the detent mechanism. Further, the cam portion and the groove portion are arranged at positions facing each other across the axis of the shift and select shaft so as to cancel the load received by the shift and select shaft from the sensor and the detent mechanism.

By the way, in the neutral position detecting device including the locating mechanism and the position detecting mechanism, the movable portion arranged in the transmission case is engaged and disengaged with the groove portion formed in the cam rotating integrally with the shift and select shaft. By doing so, positioning of the neutral position and detection of the neutral position are performed.
For this reason, when the groove part of the locating mechanism and the groove part of the position detection mechanism are respectively formed on separate cams and attached to the shift and select shaft, the groove part may depend on the machining accuracy of the groove part or the cam assembly error. There has been a disadvantage that the relative positional deviation of is increased and the detection accuracy is lowered.
Further, in Patent Document 1 described above, the portions corresponding to the respective groove portions are arranged on a single cam, but the respective groove portions are located at positions separated from each other in the circumferential direction around the rotation axis of the shift and select shaft. If it exists, there existed a problem that the relative position shift of each groove part and the relative position shift with the movable part corresponding to this became large, and the detection accuracy of the neutral position fell.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a neutral position detection device for a transmission that improves the neutral position detection accuracy.

  According to the present invention, a shift and select shaft that preliminarily selects a shift position by movement in an axial direction and rotates around the shaft to select a shift position is disposed in a transmission case, and the shift and select shaft and the transmission case are arranged. A shift mechanism in which a locating mechanism for positioning the shift-and-select shaft at a neutral position in the rotational direction and a position detection mechanism for detecting that the rotational position of the shift-and-select shaft is at the neutral position are arranged In the neutral position detecting device of the machine, the locating mechanism and the position detecting mechanism respectively extend on the outer peripheral surface of the cam attached to the shift and select shaft in a direction parallel to the rotation axis of the shift and select shaft. Grooves formed, and entry and exit of the transmission case into the grooves A movable portion that can be held, and the groove portion of the locating mechanism and the groove portion of the position detection mechanism are arranged on a single cam so as to overlap each other in the direction along the rotation axis of the shift and select shaft. It is characterized by that.

  The neutral position detection device for a transmission according to the present invention can improve the detection accuracy of the neutral position.

FIG. 1 is a perspective view from the left rear of the neutral position detector. (Example) FIG. 2 is a left side view of the neutral position detection device. (Example) FIG. 3 is a rear view of the neutral position detection device. (Example) 4 is a cross-sectional view of the neutral position detecting device taken along line IV-IV in FIG. (Example) FIG. 5 is a cross-sectional view of the neutral position detector taken along line V-V in FIG. (Example) FIG. 6 is a cross-sectional view of the neutral position detection apparatus taken along line VI-VI in FIG. (Example) FIG. 7 is a left side view showing a cam mounting state of the neutral position detecting device. (Example) FIG. 8 is a left side view of the cam. (Example) FIG. 9 is a rear view of the cam. (Example) FIG. 10 is a perspective view from the left rear of the manual transmission. (Example)

  In order to improve the neutral position detection accuracy in the neutral position detection device of a transmission, the present invention has been proposed in which a groove portion of a locating mechanism and a groove portion of a position detection mechanism are arranged on a single cam and a rotation axis of a shift and select shaft. It arrange | positions so that it may mutually overlap in the direction in alignment with.

1 to 10 show an embodiment of the present invention.
In FIG. 10, reference numeral 1 denotes a manual transmission (hereinafter referred to as “transmission”) connected to an engine mounted on a vehicle.
The transmission 1 includes a transmission case 2.
The transmission case 2 includes a clutch case portion 3 that is joined to an engine and incorporates a clutch, and a case main body portion 4 that incorporates a gear stage on the side away from the engine and is fastened by a plurality of case connecting bolts 5. Has been. The transmission case 2 forms a differential case portion 6.
Further, the case main body 4 of the transmission case 2 is formed with a shift case portion 7 having a partially circular shape extending in the vertical direction on the left side and the upper portion.
A mounting flange 9 of the neutral position detection device 8 of the transmission 1 is fixed to the shift case portion 7 with a plurality of mounting bolts 10.
The neutral position detecting device 8 includes a shift and select shaft 11 as shown in FIGS.
The shift and select shaft 11 preliminarily selects a shift position by movement in the axial direction, and rotates around the axis to select a shift position.

As shown in FIG. 4, the shift-and-select shaft 11 is fitted with the cylindrical mounting flange 9 attached to the upper portion of the shift case portion 7, and the locking portion 12 inside the mounting flange 9 An upper return spring 14 is fitted between the upper retainer 13 fixed to the outer peripheral surface, and a lower return spring 17 is interposed between the step portion 15 formed on the outer peripheral surface and the lower retainer 16 fixed to the outer peripheral surface. Is fitted. The attachment flange 9 closes the opening of the upper part of the shift case part 7 by being attached to the upper part of the shift case part 7.
A shift guide case 18 is erected on the mounting flange 9 on the right side.
The shift and select shaft 11 is attached with a shift lever 19 for shifting the shift and select shaft 11 in the circumferential direction and a select lever 20 for selecting the axis in the axial direction.
The shift lever 19 includes a counterweight 21 for enhancing a shift operation feeling, and an outer end portion communicates with a shift operation lever. As shown in FIG. 3, the counterweight 21 is disposed so as to protrude rightward.
The select lever 20 includes a lever arm 22 extending downward, and a lower end portion thereof communicates with an operation lever for shifting.

Moreover, the neutral position detection apparatus 8 is provided with the locating mechanism (neutral positioning mechanism) 23 and the position detection mechanism (neutral position detection sensor) 24 as shown in FIGS. The locating mechanism 23 positions the shift and select shaft 11 at the neutral position in the rotational direction. The position detection mechanism 24 detects that the rotational position of the shift and select 11 axis is in the neutral position.
The locating mechanism 23 and the position detecting mechanism 24 are disposed between the shift and select shaft 11 and the shift case portion 7 of the transmission case 2 as shown in FIGS.
At the position where the locating mechanism 23 and the position detecting mechanism 24 are disposed, a single cam 25 is fitted and fixed to the shift and select shaft 11 and an interlock plate 26 is fitted. .
As shown in FIGS. 4 to 6, the cam 25 is fixed to the shift and select shaft 11 and rotates together with the shift and select shaft 11 and has a through hole 27 through which the shift and select shaft 11 passes. Part 28 and an extension part 29 extending downward as a direction along the rotation axis 11 </ b> C of the shift-and-select shaft 11 from the left part which is an end part of the main body part 28.
The main body 28 of the cam 25 is disposed between the upper retainer 13 and the cam retainer 30 disposed above the step portion 15 in the axial direction of the shift and select shaft 11.
On the rear surface of the main body portion 28 of the cam 25, as shown in FIG. 9, a first speed groove 31A, a second speed groove 31B, and a third speed groove are provided as shift guide groove portions 31 corresponding to the shift position. A groove 31C, a fourth speed groove 31D, a fifth speed groove 31E, a sixth speed groove 31F, and a reverse groove 31G are formed in a predetermined arrangement.
As shown in FIGS. 7 and 8, a shift arm 33 projecting forward from the arm hole 32 of the interlock plate 26 is fixed to the outer peripheral surface of the main body 28 of the cam 25. The shift arm 33 is selectively engaged with any one of the plurality of shift yokes by the select operation in the axial direction of the shift and select shaft 11 and the shift operation in the circumferential direction of the shift and select shaft 11. Thus, the shift and select shaft 11 is shifted through the shift yoke to switch the gear stage.

As shown in FIGS. 1 to 7, the locating mechanism 23 has a direction (vertical direction) parallel to the rotation axis 11 </ b> C of the shift and select shaft 11 on the outer peripheral surface of the main body portion 28 of the cam 25 attached to the shift and select shaft 11. ), A movable portion 35 that is held in the shift case portion 7 of the transmission case 2 so as to be able to enter and leave the groove portion 34, and the movable portion 35 is elastically engaged with the groove portion 34. A spring 36 to be combined, and a movable body 35 and a positioning body 37 for holding the spring 36 are provided. The positioning body 37 is held through the holding hole 38 of the shift case portion 7 and is fixed to the shift case portion 7 with a mounting nut 39 from the left. The groove 34 is formed in a predetermined length on the entire main body 28 in a direction parallel to the rotation axis 11 </ b> C of the shift and select shaft 11.
The position detection mechanism 24 is formed to extend in the direction (vertical direction) parallel to the rotation axis 11 </ b> C of the shift and select shaft 11 on the outer peripheral surface of the extension portion 29 of the cam 25 attached to the shift and select shaft 11. A groove 40, a movable part 41 that can be moved into and out of the groove 40 by the shift case part 7 of the transmission case 2, a spring 42 that elastically engages the movable part 41 with the groove 40, and this movable A sensor main body 43 that holds the portion 41 and the spring 42. The sensor body 43 is held through the holding hole 44 of the shift case portion 7 and is fastened and fixed to the shift case portion 7 with a mounting nut 45 from the left. The groove portion 40 is formed in a predetermined length on the entire extension portion 29 in a direction parallel to the rotation axis 11 </ b> C of the shift and select shaft 11.
As described above, the mounting direction of the locating mechanism 23 and the position detection mechanism 24 is arranged at the same position in the circumferential direction around the rotation axis 11C of the shift-and-select shaft 11, thereby reducing the number of assembling steps for each mechanism. It becomes possible.

As shown in FIGS. 7 and 8, the groove 34 of the locating mechanism 23 and the groove 40 of the position detection mechanism 24 receive a load in a direction orthogonal to the rotation axis 11 </ b> C of the shift and select shaft 11. Thus, they are arranged on the single cam 25 so as to overlap each other in the direction along the rotation axis 11 </ b> C of the shift and select shaft 11.
Further, as shown in FIG. 8, the width W1 of the groove portion 34 of the locating mechanism 23 is set to be narrower than the width W2 of the groove portion 40 of the position detection mechanism 24.
As shown in FIG. 10, a stopper pin 45 is attached to the shift case portion 7 in order to restrict the rotation of the shift and select shaft 11.

Although the embodiments of the present invention have been described above, the configuration of the above-described embodiments will be described for each claim.
First, in the invention according to claim 1, the locating mechanism 23 and the position detecting mechanism 24 are respectively arranged in directions parallel to the rotation axis 11 </ b> C of the shift and select shaft 11 on the outer peripheral surface of the cam 25 attached to the shift and select shaft 11. Groove portions 34 and 40 formed so as to extend to the left side, and movable portions 35 and 41 which are held in the shift case portion 7 of the transmission case 2 so as to be able to enter and leave the groove portions 34 and 40. Further, the groove portion 34 of the locating mechanism 23 and the groove portion 40 of the position detection mechanism 24 are arranged on the single cam 25 so as to overlap each other in the direction along the rotation axis 11 </ b> C of the shift and select shaft 11.
With the above structure, the groove portion 34 of the locating mechanism 23 and the groove portion 40 of the position detection mechanism 24 are arranged in a straight line in the direction of the rotation axis 11C of the shift and select shaft 11, thereby rotating the shift and select shaft 11. It is possible to prevent relative displacement in the direction.
Further, when the groove portions 34 and 40 are arranged as described above, the movable portions 35 and 41 facing the groove portions 34 and 40 automatically overlap each other in the direction along the rotation axis 11C of the shift and select shaft 11. The movable portions 35 and 41 can be prevented from being relatively displaced in the rotational direction of the shift and select shaft 11.
Therefore, it is possible to accurately position the groove portions 34 and 40 and the movable portions 35 and 41 facing the groove portions 34 and 40, respectively, and to improve the neutral position detection accuracy in the neutral position detection device 8 of the transmission 1. Can do.
In the invention according to claim 2, the cam 25 extends in a direction along the shift and select shaft 11 from the main body portion 28 having a through hole 27 through which the shift and select shaft 11 passes. And an extension 29. Then, the groove portion 34 of the locating mechanism 23 is formed in the main body portion 28 of the cam 25, and the groove portion 40 of the position detection mechanism 24 is formed in the extension portion 29 of the cam 25.
As a result, the groove 40 of the position detection mechanism 24 usually receives less force from the movable part 41 than the groove 34 of the locating mechanism 23. Therefore, by forming the groove portion 40 of the position detection mechanism 24 in the extension portion 29 as described above, the groove portion 34 of the locating mechanism 23 and the position detection can be performed on the single cam 25 without significantly increasing the size of the cam 25. Both the groove portion 40 of the mechanism 24 can be formed, and the number of parts can be reduced, the weight can be reduced, and the number of assembly steps can be reduced.
In the invention according to claim 3, the width W1 of the groove 34 of the locating mechanism 23 is set to be narrower than the width W2 of the groove 40 of the position detecting mechanism 24.
With this structure, the shift and select shaft 11 can be accurately positioned at the neutral position by the locating mechanism 23. Further, the width W2 of the groove portion 40 of the position detection mechanism 24 can be set regardless of the width W1 of the groove portion 34 of the locating mechanism 23, and the degree of freedom of selection of the position detection mechanism 24 can be improved.

  The neutral position detection device according to the present invention can be applied to transmissions of various vehicles.

1 Transmission (manual transmission)
2 Transmission case 4 Case body 7 Shift case 8 Neutral position detector 9 Mounting flange 11 Shift and select shaft 19 Shift lever 20 Select lever 23 Locating mechanism 24 Position detecting mechanism 25 Cam 26 Interlock plate 27 Cam through-hole 28 cam body 29 cam extension 33 shift arm 34 groove of locating mechanism 35 movable part of locating mechanism 36 spring of locating mechanism 37 positioning body of locating mechanism 38 holding hole of locating mechanism 39 locating mechanism 40 Nuts of position detection mechanism 41 Movable part of position detection mechanism 42 Spring of position detection mechanism 43 Sensor body of position detection mechanism 44 Maintenance of position detection mechanism Mounting nut hole 45 position detection mechanism

Claims (3)

  A shift-and-select shaft that preliminarily selects a shift position by movement in the axial direction and rotates around the shaft to select a shift position is disposed in the transmission case, and is disposed between the shift-and-select shaft and the transmission case. Is a neutral position of a transmission in which a locating mechanism for positioning the shift-and-select shaft at a neutral position in a rotational direction and a position detection mechanism for detecting that the rotational position of the shift-and-select shaft is at a neutral position In the detection device, each of the locating mechanism and the position detection mechanism includes a groove formed on an outer peripheral surface of a cam attached to the shift and select shaft so as to extend in a direction parallel to the rotation axis of the shift and select shaft. And the transmission case is held so that it can enter and leave the groove. And a groove portion of the locating mechanism and a groove portion of the position detection mechanism are arranged on a single cam so as to overlap each other in a direction along the rotation axis of the shift and select shaft. A neutral position detection device for a transmission.   The cam includes a main body having a through hole through which the shift and select shaft passes, and an extension extending from an end of the main body in a direction along the rotation axis of the shift and select shaft. 2. The neutral position detection device for a transmission according to claim 1, wherein a groove portion of the locating mechanism is formed, and a groove portion of the position detection mechanism is formed at the extension portion.   The neutral position detection device for a transmission according to claim 1 or 2, wherein a width of the groove portion of the locating mechanism is set to be narrower than a width of the groove portion of the position detection mechanism.

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