JP4641956B2 - Housing for transmission unit - Google Patents

Description

  The present invention relates to a transmission unit housing for holding a forward / reverse switching mechanism that is connected to a drive source and coaxially disposed with a transmission mechanism, and a differential mechanism that is offset with respect to the forward / reverse switching mechanism. And it is related with the technique for piping a feed pipe efficiently in the inside.

A torque converter, a forward / reverse switching mechanism, and a primary pulley are coaxially arranged in an internal space in which a plurality of housings are combined, and a secondary pulley is offset by a belt wound around the primary pulley, and further meshes with the secondary pulley. It is known to accommodate a transmission unit with a four-axis arrangement in which a differential mechanism is offset via an idler gear (see, for example, Patent Document 1).
Japanese Patent Application No. 2004-44690

  However, such a transmission unit housing holds a plurality of rotating elements in an offset arrangement in a limited space, and therefore, when trying to supply lubricating oil or hydraulic oil to various places using a feed pipe The pipes must be installed so as not to interfere with each rotating element. For this reason, although it is conceivable to connect the feed pipe along the inner surface of the housing, the inside of the housing has a shape with a undulating undulation, so that the handling of the feed pipe is complicated.

  The problem to be solved by the present invention has been made in view of the above-described facts, and is to provide a transmission unit housing that can be easily routed when piping a feed pipe.

The present invention has a peripheral wall that surrounds at least two of a forward / reverse switching mechanism that is connected to a drive source and coaxially arranged with the speed change mechanism, and a differential mechanism that is offset with respect to the forward / backward switching mechanism, A transmission unit housing that holds the forward / reverse switching mechanism and the differential mechanism at a bottom wall of a recess surrounded by the peripheral wall, wherein a friction element for the forward / backward switching mechanism is provided on the bottom wall of the recess. A partition wall formed with a spline groove that is slidably held and having a stepped portion that cuts off a part on the differential mechanism side to prevent interference with a final gear attached to the differential mechanism; In addition, a rib that is integrally connected to the back surface of the step portion of the partition wall to hold the feeding pipe is provided.

  In the present invention, it is preferable to provide a fixture for fixing the feeding pipe on the rib.

  According to the present invention, since the feed pipe is held by the seat surface of the rib integrally connected to the back surface of the step portion that prevents interference with the final gear attached to the differential mechanism, the feed pipe is switched forward and backward. Even when piping between the mechanism and the differential mechanism, the feed pipe can be held at a position higher than the bottom wall of the recess but lower than the final gear. Does not interfere. Therefore, since it is not necessary to connect the supply pipe along the inner surface of the housing having a undulating shape, handling when supplying the supply pipe is facilitated, and workability is improved. Moreover, since the rib which concerns on this invention is integrally connected with the back surface of the step part of a partition, it can also play the role which reinforces the step part of the said partition.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a sectional view showing a belt-type continuously variable transmission unit employing a center housing 120, which will be described later, which is a transmission unit housing according to the present invention, and FIG. 2 shows a periphery of a forward / reverse switching mechanism 12 described later. FIG. 2 is an enlarged view of a main part of FIG. FIG. 3 is an enlarged cross-sectional view showing a differential mechanism 17 (described later) housed in a center housing 120 and a converter housing 110 (described later).

  The transmission unit includes a lockup type torque converter 11 connected to the engine, a forward / reverse switching mechanism 12 connected to the torque converter 11, and a primary pulley 13 connected to the forward / reverse switching mechanism 12 on a first shaft. O1, a second shaft O2 on which a secondary pulley 15 connected to the primary pulley 13 and the belt 14 is arranged, a third shaft O3 on which an idler gear 16 meshing with the secondary pulley 14 is arranged, and a difference in meshing with the idler gear 16 A power transmission system having a four-axis configuration in which the fourth shaft O4 provided with the moving mechanism 17 is disposed in an offset manner is housed in three housings 110, 120, and 130.

  The converter housing 110 houses the torque converter 11 in the front stage thereof, and forms a space for housing the forward / reverse switching mechanism 12, the idler gear 16, and the differential mechanism 17 between the converter housing 110 and the center housing 120 that is aligned with the rear surface thereof. The center housing 120 forms a space for housing the primary pulley 13 and the secondary pulley 15 between the center housing 120 and the side housing 130 mated with the converter housing 110 in front of the center housing 120.

  Here, as shown in FIG. 2, the forward / reverse switching mechanism 12 includes a forward clutch Cf having a clutch drum Cd connected to the output element 11b of the torque converter 11, and a clutch drum Cd of the forward clutch Cf via a carrier C. The planetary gear mechanism Gp connected to the clutch hub Ch of the forward clutch Cf via the sun gear S and the reverse brake Br connected to the ring gear R of the planetary gear mechanism Gp.

  The reverse brake Br includes a plurality of first clutch plates C1 held by the ring gear R of the planetary gear mechanism Gp, a plurality of second clutch plates C2 arranged alternately with the first clutch plates C1, and a clutch plate C1. , C2 is a wet multi-plate brake composed of a clutch piston P that controls the engagement and release of C2, and the second clutch plate C2 is slidably held inside a partition wall 122 described later provided in the center housing 120.

  On the other hand, as shown in FIG. 3, the differential mechanism 17 is disposed in the differential gear box 17b, and a differential gear box 17b to which a final gear 17a that is located on the outermost periphery and meshes with the idler gear 16 is attached. It consists of a plurality of differential gears. The differential gear box 17b has a first support portion 17c that meshes with the inner race of the bearing B1 and is rotatably supported between the center housing 120 and the torque converter 11 on the opposite side (left side in the drawing) On the converter 11 side (right side in the drawing), there is a second support portion 17d that meshes with the inner race of the bearing B2 and is rotatably supported between the converter housing 110 attached to the center housing 120 by bolts. Thus, when the idler gear 16 rotates, the differential gear box 17b rotates synchronously via the final gear 17a, and the output is distributed to each of the fourth shafts O4 extending left and right in FIG. 1 to drive the wheels.

  4 is a front view showing the center housing 120 from the mating surface with the converter housing 110 when in-vehicle, and FIG. 5 is an enlarged view of the main part of FIG. Further, FIG. 6 is a perspective view of a main part showing only the center housing 120 from the concave side.

  The center housing 120 has a peripheral wall 121 that forms a recess that opens the converter housing 110 side, and a bottom wall (referred to as a “partition wall”) 120f surrounded by the peripheral wall 121, along with the converter housing 110, the front and rear The advance switching mechanism 12, the idler gear 16, and the differential mechanism 17 are held.

  The peripheral wall 121 has a flange 121f that mates with the converter housing 110, and a partition wall 120f disposed inside thereof has a first pulley 13 as a primary pulley 13 disposed coaxially with the forward / reverse switching mechanism 12, as shown in FIG. A primary through hole H1 through which the shaft O1 passes, a secondary through hole H2 through which the second shaft O2 as the secondary pulley 15 passes, an idler gear holding recess H3 that houses the third shaft O3 as the idler gear 16, and a differential mechanism 17 As a fourth axis (right wheel or left wheel axle) O4, an axle through hole H4 is formed.

  Further, as shown in FIG. 6, the partition wall 120f includes an annular groove space D that surrounds the primary through hole H1 and accommodates the clutch piston P of the forward / reverse switching mechanism 12, and a partition wall that holds the second clutch plate C2. 122 is integrally provided. That is, the partition wall 122 has a plurality of spline grooves 122s extending along the first axis O1, and the second clutch plate C2 is slidably held along the spline grooves 122s so that the stroke of the clutch piston P is achieved. Accordingly, the first clutch plate C1 is engaged and released.

  Further, at the position surrounding the partition wall 122, two oil passage openings 120a and 120b formed in the partition wall 120f are communicated as shown in FIG. 4 so that the forward / reverse switching mechanism 12, the primary pulley 13, the secondary pulley 15, and the like operate. -Feeding pipes 21 for feeding lubricating oil to various places are provided. The feed pipe 21 according to the present embodiment includes a straight portion 21a connected to the oil passage opening 120a and a curved portion 21b connected to the straight passage portion 21a in a stepped manner and connected to the oil passage opening 120b. Such a configuration can be changed as appropriate.

  Here, as shown in FIG. 6, the partition wall 122 is partially cut away on the axle through hole H4 side where the differential mechanism 17 is arranged to prevent interference with the final gear 17a attached to the differential mechanism 17 The step portion 123 is formed, and on the back side of the step portion 123, the rib 1 is integrally extended from the partition wall 120f and integrally connected to the back surface 123b of the step portion 123.

  FIG. 7 is a front view showing the rib 1 from the recess of the center housing 120 and a side view thereof. The rib 1 has a seat surface 1 f that holds the feeding pipe 21. The rib 1 also has a cylindrical portion 1a that extends integrally from the partition wall 120f, and the cylindrical portion 1a is formed with a bolt hole 1h for attaching a bolt 30 for fixing the fixture 2 described later. .

  FIG. 8 is a front view and a side view showing the fixing tool 2 for fixing the feed pipe 21 to the rib 1.

  The fixture 2 has a recess 2a that sandwiches the feed pipe 21 with the seating surface 1f of the rib 1, and a base 2b that is integrally connected to the recess 2a, and the shaft of the bolt 30 is connected to the base 2b. A through hole 2h is formed to pass therethrough. Accordingly, as shown in FIG. 5, the fixture 2 can fix the feeding pipe 21 to the rib 1 by fastening the bolt 30 passing through the through hole 2h to the rib 1.

  According to this configuration, since the straight portion 21a of the feed pipe 21 is held by the seating surface 1f of the rib 1 integrally connected to the back surface 123b of the step portion 123 that prevents interference with the final gear 17a, the feed pipe 21 Since the feed pipe 21 can be held at a position higher than the partition surface 120f but lower than the final gear 17a even when the pipe is connected to the forward / reverse switching mechanism 12 and the differential mechanism 17, the forward / reverse switching mechanism 12 is of course Also, it does not interfere with the final gear 17a of the differential mechanism 17. Accordingly, since it is not necessary to connect the supply pipe 21 along the inner surface of the housing having a undulating shape, handling when supplying the supply pipe 21 is facilitated, and workability is improved. Further, since the rib 1 is integrally connected to the back surface 123p of the step portion 123 of the partition wall 122, it can also serve to reinforce the step portion 123 of the partition wall 122.

  The feed pipe 21 is preferably fixed with the fixture 2 as in the present embodiment, but it may be fixed by forming a recess in the seat surface 1f of the rib 1 and press-fitting the feed pipe 21. Good.

  Further, in this embodiment, the seating surface 1f of the rib 1 is arranged at a position higher than the top surface 123p of the stepped portion 123 by a dimension H, as shown in FIG. The height can be set lower than the top surface 123p of the stepped portion 123.

  Although the above is a preferred example of the present invention, various modifications can be made by those skilled in the art within the scope of the claims. For example, in this embodiment, the belt-type continuously variable transmission unit housing having a four-axis arrangement has been described. However, it may be used as a three-axis arrangement transmission unit housing in which a secondary pulley and an idler gear are coaxially arranged. Further, the transmission unit is not limited to the belt-type continuously variable transmission unit, and may be a stepped automatic transmission unit as long as the housing forms a storage space for the forward / reverse switching mechanism and the differential mechanism. You may apply to a housing or a stepped manual transmission unit.

  INDUSTRIAL APPLICABILITY The present invention can be applied as a housing for a transmission unit that is employed in all vehicles such as passenger cars and special workers.

It is sectional drawing which shows the belt-type continuously variable transmission unit which employ | adopted the center housing which is one form of the housing for transmission units according to this invention. FIG. 2 is an enlarged view of a main part showing the periphery of a forward / reverse switching mechanism shown in FIG. It is an expanded sectional view which shows the differential mechanism with which the center housing of the same form and the converter housing were accommodated. It is the front view which showed the center housing of the same form from the mating surface with the converter housing at the time of vehicle mounting. It is a principal part enlarged view of FIG. It is a principal part perspective view which shows only the center housing of the same form from the recessed part side. It is the front view which shows the rib provided in the center housing of the same form from the recessed part, and its side view. It is the front view which shows the fixing tool for fixing a feed pipe to the rib provided in the center housing of the same form, and its side view.

Explanation of symbols

1 rib
1a Tube
1f Seat
1h Bolt hole 2 Fixing tool
2a Fixing recess
2b base
2h Bolt shaft through hole
21 Feeding pipe
21a Straight line
21b Curved part
120 Center housing
120f Partition wall (bottom wall)
121 wall
122 Bulkhead
123 steps
123b Step back

Claims (2)

It has a peripheral wall that surrounds at least two of a forward / reverse switching mechanism that is connected to the drive source and is coaxially arranged with the speed change mechanism, and a differential mechanism that is offset with respect to the forward / backward switching mechanism, and is surrounded by the peripheral wall. A transmission unit housing that holds the forward / reverse switching mechanism and the differential mechanism at the bottom wall of the recessed portion,
A spline groove that slidably holds a friction element for a forward / reverse switching mechanism is formed on the bottom wall of the recess, and a part of the differential mechanism side is cut out and attached to the differential mechanism. A transmission unit housing comprising a partition wall formed with a step portion for preventing interference with a final gear, and a rib that is integrally connected to a rear surface of the step portion of the partition wall to hold a feeding pipe. .   The transmission unit housing according to claim 1, wherein a fixing member for fixing a feeding pipe is provided on the rib.

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