JP5063305B2 - Shift detent device for transmission - Google Patents

Description

  The present invention relates to a shift detent device, and more particularly to a shift detent device for a transmission, and more particularly to a shift detent device for a manual transmission.

In a manual transmission or the like, a shift is performed by releasably engaging a lock ball urged toward the shift rod in a rod groove formed on a shift rod that performs a shift stroke in accordance with a shift operation. There is provided a shift detent device that releasably holds the shift stroke position of the rod, and eventually the shift position of the transmission, and generates a sense of moderation in the shift operation (Patent Document 1). In such a shift detent device, the smoothness of the shift operation or the feeling of moderation is improved by forming an R shape at the peak portion between the rod grooves or using a rolling lock ball.
JP 2002-147603 (see FIG. 3)

  3A is a structural diagram of a shift detent device for a transmission according to a conventional example, and FIG. 3B is an enlarged view of FIG. 3A.

  3A and 3B, a shift detent device for a transmission according to a conventional example includes a plurality of rod grooves 14 formed on a shift rod 11 and arranged in the axial direction, and a plurality of rods. A lock ball 15 slidable and engageable on the groove 14 is provided, and a biasing means 13 that is mounted in the housing 12 and biases the lock ball 15 toward the shift rod 11.

  After all, the shift detent device according to the conventional example has a set of shift load generating portions 16 configured to include a plurality of rod grooves 14 and lock balls 15 with respect to one shift rod 11.

  Further, round portions R are respectively formed in the mountain portions between the plurality of rod grooves 14. The urging means 13 includes a spring 13a that urges the lock ball 15 toward the rod groove pattern 15 and a bearing 13b that allows the lock ball 15 to roll.

  FIG. 4 is an explanatory diagram of the shift load characteristic of the shift detent device shown in FIG. 3, the upper part is a shift load characteristic diagram showing the shift load change with respect to the shift stroke of the shift rod, and the lower part is the shift load characteristic. It is process drawing which shows the state of the lock ball and rod groove in the AE point in a figure.

  In particular, referring to the shift load characteristic diagram in the upper part of FIG. 4, when the shift rod 11 shifts with a shift operation, the contact state between the lock ball 15 and the rod groove 14 is displaced, and the shift rod 11 shifts. Stroke resistance, that is, shift load changes.

  In particular, referring to the process chart at the bottom of FIG. 4, the lock ball 15 contacts the slope in the rod groove 14 at point A, contacts the starting point of the rounded portion R between the rod grooves 14 at point B, and at point C. It contacts the apex of the rounded portion R, contacts the end point of the rounded portion R at point D, and contacts the slope in the rod groove 14 adjacent to the rod groove 14 at point E.

  Referring to the shift load characteristic diagram in the upper part of FIG. 4 and the process diagram in the lower part of FIG. 4, the shift load increases as the shift rod 11 shifts and the lock ball 15 moves from point A to point B. When the lock ball 15 is located at the point B, the shift load becomes a peak (maximum). Subsequently, as the lock ball 15 moves from the B point to the D point, the shift load becomes smaller, and when the lock ball 15 passes the C point, the shift load becomes zero. That is, a suction load is generated, and the shift load is minimized at the point D (suction point). Subsequently, the shift load increases toward the E point from the D point toward the E point.

  3 and 4 again, the shift detent device according to the conventional example has only one set of shift load generating portions 16 with respect to one shift rod 11, and will be described later. Since the shape of the rod groove 14 is limited, there is a limit to the improvement of the shift load characteristic by the device.

  For example, if the radius of the round shape R between the rod grooves 14 is decreased to improve the feeling of moderation, when the round shape R is worn, the shift load characteristic change before and after the wear is large, and the shift performance change with time increases. This causes a problem that the operator feels uncomfortable.

  In particular, referring to FIG. 4, according to the conventional detent device, the shift stroke required from the peak load generation point (point B) to the suction point (point D) becomes long, and the operator performs the shift operation. There is a problem that it is difficult to experience moderation.

  An object of the present invention is to provide a shift detent device for a transmission that can easily operate a shift load characteristic and can improve a moderation feeling of the shift operation.

According to a first aspect of the present invention, a plurality of rod grooves formed on a shift rod of a transmission and arranged along the axial direction of the shift rod, slidable on the plurality of rod grooves, and the rod grooves The shift rod having an engageable lock ball and an urging means for urging the lock ball toward the shift rod, the shift rod performing a shift stroke along the axial direction in accordance with a shift operation; A shift detent device that causes the shift rod to hold a predetermined shift position or generate a moderation feeling of the shift operation by variably acting a shift load by the lock ball that appears and disappears along the radial direction of the shift rod The plurality of rod grooves and the lock balls slidable on the plurality of rod grooves with respect to at least one shift rod. A plurality of sets of shift load generating portions, and the plurality of sets of shift load generating portions are represented by a first load line in a shift load diagram representing the shift load with respect to a shift stroke of the shift rod. A first shift load generating section for generating a load, and a second shift load generating section for generating the shift load represented by a second load line different from the first load line, The total shift load acting is represented by a composite load line based on the first and second load lines, and the absolute value of the slope from the peak load generation point to the suction point with respect to the shift load is the possible combined load line is always larger than the first and second load line, the shift stroke from the peak load generation point to the suction point, the shift to the combined load lines shown Who stroke, the first thing that is shorter than the shift stroke indicated load line, to provide a shift detent device according to claim.

  The shift detent apparatus of the present invention has at least two sets of shift load generating portions or two lock balls having different shift load characteristics for one shift rod, and thus the total shift load obtained is Since it is based on a combination of the shift loads generated by the two sets of shift load generation parts or two lock balls, the shift load characteristics are compared with the case where there is only one set of shift load generation parts or one lock ball. Is easy to operate. Further, according to the present invention, without changing the round shape between the rod grooves, for example, by changing the diameter of one of the lock balls, the shift load characteristic can be changed while maintaining a moderation feeling. In particular, according to the present invention, the shift stroke required from the peak load generation point to the suction point of the shift load can be shortened and the moderation feeling can be improved by synthesizing the shift load.

  In a preferred embodiment of the present invention, in the two sets of shift load generators having different shift load characteristics, the two rod grooves are common or similar (for example, rotationally symmetric) to each other. The lock balls have different shapes, and more preferably, the two lock balls have different diameters. According to this embodiment, it is easy to process the shift rod or form a plurality of rod grooves.

  In a preferred embodiment of the present invention, the shift stroke positions of the shift rod at which the shift load reaches a peak are different from each other in two sets of shift load generation portions having different shift load characteristics. According to this embodiment, the shift stroke required from the peak shift load generation point to the suction point can be significantly shortened by synthesizing the shift load.

  In a preferred embodiment of the present invention, the shift detent device of the present invention is applied to at least one or a plurality of shift rods among the plurality of shift rods of the transmission.

  In a preferred embodiment of the present invention, the transmission is a continuously meshing parallel gear type manual transmission having a synchronization device. In this transmission, with the manual operation of the shift lever, the predetermined shift rod shifts, and the sleeve of the synchronizer that is slidably disposed on the shaft and connected to the shift lever shifts, A predetermined shift stage is achieved by engaging a predetermined transmission gear loosely fitted on the shaft in a releasable manner and causing the transmission gear and the shaft to rotate together.

  An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a structural diagram of a shift detent device for a transmission according to an embodiment of the present invention. FIG. 2 is an explanatory diagram of the shift load characteristic of the shift detent apparatus shown in FIG.

  1 and 2, a shift detent apparatus for a transmission according to an embodiment of the present invention includes a plurality of rod grooves formed on a shift rod 1 of the transmission and arranged along the axial direction of the shift rod 1. 4, first and second lock balls 5 a and 5 b slidable on and engageable with the plurality of rod grooves 4, and first and second lock balls 5 a and 5 b are connected to the shift rod 1. Biasing means (see biasing means 13 in FIG. 3) for biasing toward the center. Round portions R are respectively formed in the mountain portions between the plurality of rod grooves 4.

  The shift detent apparatus according to the present embodiment includes first and second lock balls 5a and 5b that protrude and project along the radial direction of the shift rod 1 on the shift rod 1 that shifts along the axial direction in accordance with a shift operation. The shift load is variably applied to cause the shift rod 1 to hold a predetermined shift position or generate a sense of moderation in the shift operation.

  The shift detent apparatus according to the present embodiment has at least two sets of shift load generating portions having different shift load characteristics with respect to the shift stroke of the shift rod 1, that is, the first and second shift rods 1. It has two sets of shift load generating parts 6a and 6b. The first shift load generating portion 6 a includes a plurality of rod grooves 4 and a first lock ball 5 a that can slide on the plurality of rod grooves 4. The second shift load generating portion 6 b includes a plurality of rod grooves 4 and a second lock ball 5 b that can slide on the plurality of rod grooves 4.

  In the first and second shift load generating portions 6a and 6b, the plurality of rod grooves 4 are common to each other, the first and second lock balls 5a and 5b have different diameters, and the second lock ball 5b The diameter is smaller. The plurality of rod grooves 4 are rotationally symmetric with respect to the rotation axis of the shift rod 1.

  The function of the shift detent device for a transmission according to one embodiment of the present invention described above will be described.

  FIG. 2 is an explanatory diagram of the shift load characteristic of the shift detent device shown in FIG. 1, the upper part is a shift load characteristic diagram showing the shift load change with respect to the shift stroke of the shift rod, and the lower upper part is the shift load characteristic. It is process drawing of the 1st shift load generation | occurrence | production part which shows the state of the 1st lock ball and rod groove in A to E point in a characteristic view, and the lower lower part is the 1st in A to E point in shift load characteristic view It is process drawing of the 2nd shift load generation | occurrence | production part which shows the state of 2 lock balls and rod grooves. In the shift load characteristic diagram of FIG. 2, the first load line represents the shift load characteristic of the first shift load generation unit 6a, and the second load line represents the shift load characteristic of the second shift load generation unit 6b. The bold lines indicate the combined first and second load lines, respectively.

  Referring to FIG. 2, when the shift rod 1 undergoes a shift stroke in accordance with the shift operation, the contact state between the first and second lock balls 5 a and 5 b and the plurality of rod grooves 4 is displaced, respectively. As shown by the second load line, the shift stroke resistance of the shift rod 1, that is, the shift load changes. The shift load for the shift rod 1 is a combination of the shift loads by the first and second shift load generating portions 6a and 6b, that is, a composite load line obtained by superimposing the first and second load lines. Become. Hereinafter, the individual and synthesized shift load characteristics will be described in detail.

[First shift load generating portion 6a, first lock ball 5a having a large diameter]
In particular, referring to the process diagram in the upper part of the lower part of FIG. 2, the first lock ball 5a abuts against the slope in the rod groove 4 at the point A and hits the starting point of the rounded portion R between the rod grooves 4 at the point B ′. At point B, abutting in the middle of the rounded portion R between the rod grooves 4, at point C, abutting on the apex of the rounded portion R, and at point D, in the middle of the opposite side of the rounded portion R between the rod grooves 4 At the point D ′, it contacts the end point of the rounded portion R, and at the point E, it contacts the slope in the rod groove 4 adjacent to the rod groove 4.

  Referring to the first load line by the first shift load generating portion 6a and the process diagram, when the shift rod 1 performs a shift stroke, the first lock ball 5a shifts from the point A to the point B '. The load increases and the shift load reaches a peak (maximum) at the point B ′. Subsequently, as the first lock ball 5a passes from the B 'point, passes through the B and C points, and moves toward the D' point, the shift load is reduced, and the first lock ball 5a is moved to the C point on the way. The shift load becomes zero when passing through, and thereafter, a negative shift load, that is, a suction load occurs, and the shift load becomes the minimum at the point D ′ (suction point). Subsequently, as the first lock ball 5a moves from the D ′ point to the E point, the shift load increases toward plus.

[Second shift load generating portion 6b, small diameter second lock ball 5b]
In particular, referring to the process chart in the lower part of FIG. 2, the second lock ball 5 b has a small diameter, so that it does not act on the shift rod 1 apart from the slope in the rod groove 4 at point A. After reaching the point B ′, it contacts the slope in the rod groove 4, contacts the starting point of the rounded portion R between the rod grooves 4 at the point B, contacts the apex of the rounded portion R at the point C, and the rod at the point D Abuts on the opposite end of the rounded portion R between the grooves 4, contacts a slope in the rod groove 4 adjacent to the rod groove 4 at a point D ', and separates from a slope in the rod groove 4 at a point E. No shift load is applied to the shift rod.

  Referring to the second load line by the second shift load generator 6b and the process diagram, when the shift rod 1 performs a shift stroke, the second lock ball 5b receives a shift load during the period from point A to point B '. It does not act on the shift rod 1. As the second lock ball 5b moves from the B ′ point to the B point, the shift load increases, and when the second lock ball 5b is positioned at the B point, the shift load reaches a peak (maximum). Subsequently, as the second lock ball 5b passes from the point B to the point C and moves toward the point D, the shift load decreases, and when passing through the point C on the way, the shift load becomes zero. A negative shift load, that is, a suction load is generated, and the shift load becomes the minimum at point D (suction point). Subsequently, as the second lock ball 5b moves from the point D to the point D ′, the shift load increases toward the plus. The second lock ball 5 b does not apply a shift load to the shift rod 1 during the period from the point D ′ to the point E.

  In summary, referring to the first load line, the peak of the shift load due to the first shift load generator 6a (first lock ball 5a) is at the B ′ point on the plus side and at the D ′ point on the minus side. The shift stroke between the peak shift load generation point and the suction point is B ′ to D ′. Referring to the second load line, the peak of the shift load due to the second shift load generator 6b (second lock ball 5b) is the B point on the plus side and the D point on the minus side.

  In other words, the shift detent device of the present embodiment is different from the first and second lock balls 5a, 5b through the shift stroke position of the shift rod 1 at which the shift load reaches a peak with respect to one shift rod 1. It has 1st and 2nd shift load generation part 6a, 6b.

  In the shift load characteristic diagram of FIG. 2, a thick load line indicates a combined load line obtained by combining both shift loads (combination of the first and second load lines indicated by a thin line in FIG. 2). When the first load line is compared with the thick line indicating the synthesized total shift load, the shift stroke between the peak load generation point (plus side) and the suction point (minus side) is B′˜ It is shortened from D ′ to B to D. In other words, the absolute value of the slope from the peak load generation point to the suction point with respect to the shift load is larger in the combined load line than in the first and second combined load lines. Therefore, according to the shift detent apparatus of the present embodiment, the operation time or the operation distance can be obtained only by changing the diameter of the second lock ball 5b with the diameter of the first lock ball 5a without changing the shape of the rounded portion R. A sense of moderation has been improved.

  When the thick line indicating the total shift load combined with the second load line is contrasted, the difference between the peak shift load and the shift load at the suction point is enlarged. According to the shift detent device of this embodiment, the round portion It can be seen that the load moderation feeling is improved only by changing the diameter of the second lock ball 5b to the diameter of the first lock ball 5a without changing the shape of R.

  The shift detent device of the present invention is suitably applied to a transmission mounted on a vehicle or the like, and in particular, a manual transmission.

1 is a structural diagram of a shift detent device for a transmission according to an embodiment of the present invention. It is explanatory drawing of the shift load characteristic of the shift detent apparatus shown in FIG. (A) is a structural diagram of a shift detent device for a transmission according to a conventional example, and (B) is an enlarged view of (A). It is explanatory drawing of the shift load characteristic of the shift detent apparatus shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Shift rod 4 Several rod groove 5a, 5b 1st and 2nd lock ball 6a 1st shift load generation part 6b 2nd shift load generation part R Round part 11 Shift rod 12 Housing 13 Energizing means 13a Spring 13b Bearing 14 A plurality of rod grooves 15 A lock ball 16 A set of shift load generating portions

Claims (3)

A plurality of rod grooves formed on a shift rod of the transmission and arranged along an axial direction of the shift rod; a lock ball slidable on and engageable with the rod grooves; and the lock An urging means for urging the ball toward the shift rod, and projecting and projecting along the radial direction of the shift rod in the shift rod that performs a shift stroke along the axial direction in accordance with a shift operation. A shift detent device that causes the shift rod to hold a predetermined shift position or generate a moderation feeling of the shift operation when a shift load by the lock ball is variably applied,
With respect to at least one of the shift rods, a plurality of sets of shift load generating portions configured by the plurality of rod grooves and the lock balls slidable on the plurality of rod grooves are provided.
The plurality of sets of shift load generation units are first shift load generation units that generate the shift load represented by a first load line in a shift load diagram representing the shift load with respect to a shift stroke of the shift rod. And a second shift load generator that generates the shift load represented by a second load line different from the first load line,
The total shift load acting on the shift rod is represented by a composite load line based on superposition of the first and second load lines;
The absolute value of the slope from the peak load generation point to the suction point with respect to the shift load is such that the combined load line is always larger than the first and second load lines,
The shift stroke from the peak load generation point to the suction point is such that the shift stroke indicated by the composite load line is shorter than the shift stroke indicated by the first load line,
Shift detent device characterized by Characterized in shift load characteristic mutually different first and second shift load generating portion, two of said plurality of rods grooves are mutually common or similar shape, two of said locking balls to each other shape differ, the The shift detent apparatus according to claim 1. In shifted first and second shift load generator load characteristic are different from each other, shift detent of claim 1 or 2, wherein the shift stroke position of the shift rod the shift load reaches a peak is being different from each other apparatus.

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