JP6459174B2 - Transmission with auxiliary transmission mechanism - Google Patents

Description

  The present invention relates to a transmission with a sub-transmission mechanism, and more particularly to a transmission with a sub-transmission mechanism that can perform synchronous gear shifting more reliably and accurately than in the past.

  In recent large vehicles, multi-stage transmissions with 12 or 16 gears are employed. In such a multi-stage transmission, a method of taking a multi-stage by combining a sub-transmission called a splitter and a main transmission is employed instead of simply increasing the number of gear stages.

  A separate transmission mechanism is required for each of the auxiliary transmission and the main transmission. Therefore, in order to obtain the optimum gear ratio according to the running state of the vehicle, the operating mechanisms of both transmissions must be operated simultaneously, which has been a heavy burden on the driver.

  On the other hand, the inventor has made a sub-transmission mechanism that can simultaneously shift the gear by synchronizing the sub-transmission and the main transmission via an interlocking mechanism including a four-bar linkage mechanism by operating a single operation lever. A geared transmission is proposed (see Patent Document 1). This interlocking mechanism has a function to rotate the output in one direction on the main transmission side regardless of the rotation direction of the input when the input is performed in the shift direction on the sub transmission side from the neutral position by the operation lever. doing.

  In the above four-bar linkage mechanism, it is known that the relationship between the operating angle of the input [x] and the output [y] is a quadratic curve. Therefore, at the end of the stroke of the operating lever where the slope of the quadratic output [y] increases, the operating force proportional to | y / x | decreases as the stroke speed increases. There is a problem that the gears in the main transmission are difficult to mesh with each other.

  In order to solve such a problem, the projecting portion standing on one arm engages with a guide groove provided on the other arm, and the guide groove protrudes toward one arm. It has been studied to make the operation angles of the input [x] and the output [y] substantially equal by using a interlocking mechanism formed in a ν shape. In this new interlocking mechanism, since the guide groove is discontinuous at the substantially v-shaped bent portion corresponding to the neutral position N, it is necessary to prevent the protrusion from rattling. For this purpose, it is conceivable to provide a pressing means using an elastic member and press the protrusion against the groove wall (edge), but there is a possibility that the neutral position N cannot be accurately determined because the reliability is low.

JP2013-137079A

  An object of the present invention is to provide a transmission with a sub-transmission mechanism that can perform synchronous gear shifting more reliably and accurately than in the past.

A transmission with a sub-transmission mechanism of the present invention that achieves the above object is a transmission with a sub-transmission mechanism that simultaneously shifts the main transmission mechanism and the sub-transmission mechanism by operating the operation lever in the select direction and the shift direction. A sub-shifting shift shaft that extends in the select direction on the sub-transmission mechanism side and rotates in response to an operation of the operating lever in the shift direction; and an upper end portion of the sub-shifting shift shaft is freely rotatable. A sub-shifting shift lever that is supported by and extends downward, a sub-shifting shift block that is disposed below the sub-shifting shift shaft and engages a lower end portion of the sub-shifting shift lever, and A rotatable main transmission shift shaft provided extending in the select direction on the transmission mechanism side, provided extending downward from the main transmission shift shaft, and the operation lever. A main shift lever that moves in the select direction when operated in the select direction, and is arranged below the main shift shift shaft in parallel in the select direction and engages with the lower end of the main shift shift lever In the transmission with a sub-transmission mechanism including a plurality of main transmission shift blocks, the sub-transmission shift shaft and the main transmission shift shaft are formed in a rotatable columnar shape standing on one arm. The projection is connected by an interlocking mechanism that engages with a guide groove provided on the other arm, and in the other arm, the guide groove protrudes toward the shift shaft to which the one arm is connected. The bent portion of the guide groove protrudes from the other edge facing the edge toward the edge on the shift shaft side to which the one arm is connected. It has a slide guide which, on the top of the protrusion of the one arm, is characterized in that to form the sliding contact portion of the cross sector of the protrusion portion coaxially.

  According to the transmission with the auxiliary transmission mechanism of the present invention, since the auxiliary transmission shift shaft on the auxiliary transmission mechanism side and the main transmission shift shaft on the main transmission mechanism side are connected using the interlock mechanism as described above, Thus, it is possible to perform synchronous shift more reliably and accurately.

1 is a skeleton diagram of a transmission with an auxiliary transmission mechanism according to an embodiment of the present invention. FIG. It is a typical perspective view which shows the shift operation apparatus which operates the transmission with an auxiliary transmission mechanism which consists of embodiment of this invention. It is a top view which shows the structure of the transmission with an auxiliary transmission mechanism which consists of embodiment of this invention. It is a block diagram from the select direction of the interlocking mechanism in the transmission with an auxiliary transmission mechanism according to the embodiment of the present invention. It is drawing which shows the shape of a slide guide, Comprising: (a) is a top view of a guide groove, (b) is sectional drawing of the VV arrow shown to (a). It is drawing which shows the shape of a sliding contact part, Comprising: (a) is a top view of a projection part, (b) is sectional drawing of the WW arrow shown to (a). It is a schematic diagram explaining the shape of a slide guide.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a transmission with a subtransmission mechanism according to an embodiment of the present invention. In the following description, “for splitter” means “for auxiliary transmission”, and “for main” means “for main transmission”.

  As shown in FIG. 1, the transmission with a sub-transmission mechanism (hereinafter referred to as “transmission”) 1 includes a splitter-type sub-transmission mechanism 2 disposed on the input side and a main transmission disposed on the output side. The mechanism 3 is mainly configured.

  An input shaft 4 to which the output of an engine (not shown) is transmitted is installed on the auxiliary transmission mechanism 2 side. A main shaft 5 is disposed on the main transmission mechanism 3 side so as to be coaxial with the input shaft 4. Further, the auxiliary transmission mechanism 2 and the main transmission mechanism 3 are provided with a counter shaft 6 that extends in parallel to the input shaft 4 and the main shaft 5.

  A splitter low speed gear 7 is provided on the input shaft 4 so as to be relatively rotatable. The main shaft 5 is provided with a splitter high speed gear 8, a main third speed gear 9, a main second speed gear 10, a main first speed gear 11, and a main reverse gear 12 in order from the input side so as to be relatively rotatable.

  The counter shaft 6 includes a counter low-speed gear 13 that meshes with the splitter low-speed gear 7, a counter high-speed gear 14 that meshes with the splitter high-speed gear 8, a counter third-speed gear 15 that meshes with the main third-speed gear 9, and a main second-speed gear. A counter second speed gear 16 that meshes with 10, a counter first speed gear 17 that meshes with the main first speed gear 11, and a counter reverse gear 19 that meshes with the main reverse gear 12 via an idler gear 18 are fixed.

  As described above, the transmission 1 is configured so that the forward 6-stage (1st speed L to 3rd-speed H) and the reverse 2nd-stage (by the selective switching of the splitter gears 7 and 8 and the selective switching of the main gears 9 to 12) The rearward shift L and the reverse shift H) are configured to be possible.

  As shown in FIG. 2, the shift operation device 20 of the transmission 1 has a plurality of H-type gates 21 and their H-type gates 21 so that the speed change between the sub-transmission mechanism 2 and the main transmission mechanism 3 can be operated simultaneously. And an operation lever 22 for moving (stroke).

  A select path 23 is provided in the select direction of the H-shaped gate 21, and a neutral position N corresponding to the neutral mode is set at the center thereof. Further, four shift paths 24 to 27 orthogonal to the select path 23 are provided in the shift direction of the H-type gate 21. Further, at the end portions of the four shift paths 24 to 27 corresponding to the end of the stroke of the operation lever 22, there are six forward speeds (1st speed L to 3rd speed H) and 2 reverse speeds (reverse L, reverse). Shift positions corresponding to H) are respectively set.

  That is, the shift operating device 20 is connected to the shift mechanism of the subtransmission mechanism 2 when the operation lever 22 is operated in the shift direction, and is connected to the select mechanism of the main transmission mechanism 3 when the operation lever 22 is operated in the select direction. It is configured to be.

  As shown in FIG. 3, the transmission mechanism 30 of the transmission 1 includes a first shift shaft 31 that extends in the shift direction, a second shift shaft 32 that extends parallel to the first shift shaft 31, and a sub-transmission. Four shafts consisting of a splitter shift shaft 33 extending in the select direction on the mechanism 2 side, a main shift shaft 34 extending in the select direction on the main transmission mechanism 3 side, and a main R / 1 speed connecting mechanism 35 and a main 2/3 speed connection mechanism (not shown).

  A splitter shift lever 36 is rotatably attached to the splitter shift shaft 33, and a spring 38 is interposed between the splitter shift lever 36 and the annular flange 37. A splitter shift block 39 is disposed below the splitter shift shaft 33. The lower end of the splitter shift lever 36 is formed at the center of the splitter shift block 39, as shown in FIG. Engaged with the recess.

  An upper end portion of the main shift lever 40 is spline-fitted to the main shift shaft 34. For this reason, the main shift lever 40 rotates integrally with the main shift shaft 34, while being movable in the axial direction (select direction) of the main shift shaft 34. Also, below the main shift shaft 34, four main shift blocks 41 to 44 arranged in parallel in the select direction are arranged. As shown in FIG. 4, the lower end portion of the main shift lever 40 is The main shift blocks 41 to 44 are engaged with recesses formed in the center.

  A splitter shift fork 45 is provided on the first shift shaft 31 so as to be movable in the axial direction, and a main 2/3 speed shift fork 46 is fixed thereto. A main R / 1 speed shift fork 47 is fixed to the second shift shaft 32.

  The main R / 1 speed connecting mechanism 35 includes a connecting member 48 for connecting and fixing the main reverse shift block 41 and the second shift shaft 32, a rod 49 fixed to the main first speed shift block 42, and a central portion. And a reversing lever 50 that can rotate around the fulcrum. The reversing lever 50 has one end connected to the rod 49 and the other end hinged to the second shift shaft 32.

  For the main 2/3 speed connecting mechanism (not shown), the connecting member 48 connects and fixes the main 2 speed shift block 43 and the first shift shaft 31, and the reversing lever 50 is the main 3 speed shift block 44. Except for being hingedly connected to the rod 49 fixed to the first shift shaft 41, the main R / 1 speed connecting mechanism 35 is configured in substantially the same manner.

  In this speed change mechanism 30, when the shift mechanism of the auxiliary speed change mechanism 2 is shifted (in the X direction shown in FIG. 3) by the operation of the operation lever 22 in the shift direction and the splitter shift shaft 33 rotates, the shift lever for splitter is rotated. 36 is rotated by the rotational force transmitted through the annular flange 37 and the spring 38. Accordingly, the splitter shift block 39 moves in the left-right direction (X and Y directions shown in FIG. 4) in accordance with the operation of the operation lever 22 in the shift direction.

  For example, when the splitter shift shaft 33 is rotated in the clockwise direction (direction A shown in FIG. 4) by the operation of the operation lever 22 in the shift direction, the splitter shift lever 36 is also rotated in the same direction. The shift block 39 moves to the left (X direction shown in FIG. 4). As a result, the shift fork 45 for the splitter moves to the left toward the splitter low-speed gear 7 and contacts the spline teeth (not shown) of the corresponding sleeve and the dog teeth (not shown) of the block ring. Let

  Further, in the transmission mechanism 30, when the selection mechanism of the main transmission mechanism 3 is selected by the operation of the operation lever 22 in the selection direction (Y direction shown in FIG. 3), the main shift lever 40 is moved to the main shift shaft 34. Move along the select direction. Thereby, the lower end part of the main shift lever 40 is engaged with any one of the recesses of the main shift blocks 41 to 44 corresponding to the selected arbitrary shift position.

  For example, when the main shift lever 40 rotates counterclockwise (the F direction shown in FIG. 4) by operating the operation lever 22 in the select direction, the main first speed shift block 42 moves to the right (the Y direction shown in FIG. 4). Move to). Then, the rightward moving force of the main first speed shift block 42 is converted to the leftward by the rotation operation of the reversing lever 50 and transmitted to the second shift shaft 32. As a result, the main R / 1-speed shift fork 47 moves to the left toward the main first-speed gear 11 along with the second shift shaft 32, and the corresponding spline teeth (not shown) and blocks of the sleeve Contact the dog teeth (not shown) of the ring.

  In such a transmission 1, the splitter shift shaft 33 and the main shift shaft 34 have one end fixed to the splitter shift shaft 33 and the other end having a rotatable columnar protrusion 60. It is connected by an interlocking mechanism 64 comprising a splitter interlocking arm 61 and a main interlocking arm 63 having a guide groove 62 with one end fixed to the main shift shaft 34 and the other end being engaged with the projection 60. ing. Note that the outer diameter of the protrusion 60 and the groove diameter of the guide groove 62 are substantially the same.

  The guide groove 62 is formed in a substantially ν shape that is convex toward the splitter shift shaft 33 side, and a bent portion 62 a thereof corresponds to the neutral position N.

  Further, a slide guide 65 is provided in the guide groove 62 so as not to rattle when the protrusion 60 is positioned at the bent portion 62a where the shape of the guide groove 62 is discontinuous, and a slide that engages with the slide guide 65 is provided. The contact portion 66 is formed on the upper surface of the protrusion 60 of the splitter interlocking arm 61.

  The shapes of the slide guide 65 and the sliding contact portion 66 will be described in detail below based on FIGS.

  As shown in FIG. 5, the slide guide 65 has a schematic shape that protrudes from the edge 67a on the apex P side of the bent portion 62a of the guide groove 62 toward the opposite edge 67b. Further, the thickness m of the slide guide 65 is thinner than the thickness M of the main interlocking arm 63.

  As shown in FIG. 6, the slidable contact portion 66 is formed on the upper surface of the columnar protrusion 60 and has a fan-shaped cross section that is coaxial with the protrusion 60.

  The planar shapes of the slide guide 65 and the sliding contact portion 66 are as follows.

  When the protrusion 60 having the diameter of the guide groove 62 moves along the guide groove 62, as shown in FIG. 7, the center of one short groove 62b is separated from the bent portion 62a of the guide groove 62 as shown in FIG. The point Q at which the line 68 and the center line 69 of the other short groove 62c intersect, the apex P of the bent part 62a, and the legs of the perpendiculars respectively dropped from the apex P to the center lines 68 and 69 of the short grooves 62b and 62c. Since the protrusion 60 can freely move in a region T obtained by subtracting a fan-shaped region composed of the vertex Q and the intersections R and S from a substantially trapezoidal region composed of R and S, rattling occurs. . Therefore, the slide guide 65 has a shape in which the line segment connecting the points R, Q, and S is a part of the outer edge and extends in the direction of the apex Q so that the region T disappears.

  The splitter interlocking arm 61 and the main interlocking arm 63 are used in a state where the upper part of FIG. 6B and the lower part of FIG. 5B are combined, and the guide groove 62 other than the bent part 62a is used. While the projecting portion 60 is engaged, the sliding contact portion 66 is engaged with the bent portion 62a.

By providing such an interlocking mechanism 64, the projecting portion 60 causes the guide groove 62 to transmit the rotational force in the left and right directions (directions C and D shown in FIG. 4) transmitted from the splitter shift shaft 33 to the splitter interlocking arm 61. , The main interlocking arm 63 is converted to a leftward rotational force (E direction shown in FIG. 4) and the main shift shaft 34 is always rotated leftward (F direction shown in FIG. 4). Let As a result, the splitter shift block 39 moves in both the left and right directions (X and Y directions shown in FIG. 4) in response to the operation of the operation lever 22 in the shift direction, while the main shift blocks 41 to 44 move to the right ( The auxiliary transmission mechanism 2 and the main transmission mechanism 3 are synchronously shifted by moving in only one direction (Y direction shown in FIG. 4).

When the protrusion 60 slides along the substantially v-shaped guide groove 62, the operating angle x of the splitter shift shaft 33 and the operating angle y of the main shift shaft 34 have the following relationship.
y ≒ | x |

  Therefore, the reduction in the operating force at the end of the stroke of the operating lever 22 is smaller than in the case of the conventional four-bar linkage mechanism, so that the gears can be easily meshed with each other on the main transmission mechanism 3 side.

  Further, a slide guide 65 having a predetermined shape is provided in the guide groove 62, while a sliding contact portion 66 that engages with the slide guide 65 is formed on the upper surface of the projection 60, thereby using a pressing means that uses an elastic member. Since the protrusion 60 is reliably prevented from rattling compared to the case where the neutral position N is present, the neutral position N can be determined more accurately.

  As described above, in the transmission 1 according to the present embodiment, it is possible to perform a synchronous shift more reliably and accurately than in the past.

Further, the thickness M of the guide groove 62, the thickness m of the slide guide 65, the height n1 of the slidable contact portion 66, and the height n2 of the projection portion 60 satisfy the following relationship, thereby interlocking. The operation becomes smooth and the structure of the interlocking mechanism 64 becomes compact.
m = n1
M = m + n2

Furthermore, by making the shape of the guide groove 62 satisfy the following relationship, it is possible to perform synchronous shift more reliably.
y = | x |

  The number of shift stages in the transmission 1 of the present invention is not limited to the above-described six forward speeds (1st speed L to 3rd speed H), but 4 forward speeds (1st speed L to 2nd speed H) or 8 forward speeds ( 1st speed L to 4th speed H), or more stages may be used.

  The transmission 1 is not limited to a manual transmission, and the present invention can also be applied to a mechanical manual transmission (AMT) in which a shift operation and a selection operation are automated by an actuator or the like.

1 Transmission with Sub Transmission Mechanism 2 Sub Transmission Mechanism 3 Main Transmission Mechanism 22 Operation Lever 33 Splitter Shift Shaft 34 Main Shift Shaft 60 Projection 61 Splitter Interlocking Arm 62 Guide Groove 63 Main Interlocking Arm 64 Interlocking Mechanism 65 Slide Guide 66 Sliding part

Claims (4)

A transmission with a sub-transmission mechanism that simultaneously shifts the main transmission mechanism and the sub-transmission mechanism by operating the operation lever in the select direction and the shift direction
A sub-shifting shift shaft that extends in the select direction on the sub-transmission mechanism side and rotates in response to an operation in the shift direction of the operation lever;
A sub-shifting shift lever that is supported by the sub-shifting shift shaft so that its upper end portion is rotatably supported and extends downward;
A sub-shifting shift block disposed below the sub-shifting shift shaft and engaged with a lower end of the sub-shifting shift lever;
A rotatable main transmission shift shaft provided extending in the select direction on the main transmission mechanism side;
A main transmission shift lever that extends downward from the main transmission shift shaft and moves in the selection direction by operation of the operation lever in the selection direction;
A sub-transmission mechanism-equipped transmission including a plurality of main transmission shift blocks that are arranged below the main transmission shift shaft in parallel in the select direction and engage with a lower end portion of the main transmission shift lever.
The auxiliary transmission shift shaft and the main transmission shift shaft are connected by an interlocking mechanism in which a rotatable columnar projection provided upright on one arm engages a guide groove provided on the other arm. And
In the other arm, the guide groove is formed in a substantially ν shape that protrudes toward the shift shaft to which the one arm is connected, and the bent portion of the guide groove is a shift that is connected to the one arm. has a slide guide which protrudes from the other edge opposite to the edge portion toward the edge portion of the shaft side,
A transmission with a sub-transmission mechanism, wherein a sliding contact portion having a sectoral cross section that is coaxial with the protrusion is formed at the top of the protrusion in the one arm. The slide guide is perpendicular to the other edge of the bent portion of the guide groove and extends to the center line of one short groove and the other short groove with the bent portion as a boundary. A line segment connecting the intersection of the center line of the groove is formed in a part of the outer edge, and is configured to expand toward the intersection of the center line,
While making the thickness of the slide guide and the height of the sliding contact portion the same, making the thickness of the guide groove the same as the total value of the thickness of the slide guide and the height of the protrusion,
Regardless of the direction in which the sub-shifting shift shaft is rotated by the operation of the operating lever in the shift direction, the rotational force transmitted to the main transmission shift shaft via the interlocking mechanism is equalized by the interlocking mechanism. Converted into a direction, and the main shift lever is rotated in only one direction,
The rotational force of the auxiliary transmission shift shaft is applied to the auxiliary transmission shift lever via an elastic member so that the synchronizing mechanism on the auxiliary transmission mechanism side and the synchronizing mechanism on the main transmission mechanism side simultaneously start synchronous coupling. The transmission with a subtransmission mechanism according to claim 1, wherein the transmission is transmitted. The one arm in the interlocking mechanism is composed of a sub-shift interlocking arm in which one end is fixed to the sub-shifting shift shaft and the projection is erected on the other end.
3. The subtransmission mechanism according to claim 1, wherein the other arm is constituted by a main transmission interlocking arm having one end fixed to the main transmission shift shaft and the other end formed with the guide groove. With transmission. The sub guide according to any one of claims 1 to 3, wherein the guide groove has a shape such that the operating angle y of the other arm with respect to the operating angle x of the one arm satisfies the following expression (1). A transmission with a transmission mechanism.
y = | x | ----- (1)

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