JP7795964B2 - Baffle plate - Google Patents

Description

The present invention relates to a baffle plate attached to a transmission case.

Patent Document 1 discloses a baffle plate for a differential device that is disposed inside a differential case. This baffle plate is fixed to the differential case with bolts.

Japanese Patent Application Laid-Open No. 2015-178887

The baffle plate disclosed in Patent Document 1 is fixed to the differential case with multiple bolts, but tightening the multiple bolts is cumbersome.

The object of the present invention is to provide a baffle plate that is easy to attach to a case.

In order to solve the above problems, one aspect of the present invention is a baffle plate that is attached to a mounting hole formed on the inner surface of a transmission case. The baffle plate includes a rod whose tip is inserted into the mounting hole formed on the inner surface of the case, and a plate supported by the rod. The plate has a first holding portion that holds the rod, and a second holding portion that is located closer to the mounting hole than the first holding portion and holds the rod. The rod is held by the first and second holding portions so that it can move axially toward and away from the mounting hole. The axial movement of the rod takes it between a locked position where the tip of the rod is inserted into the mounting hole, and an unlocked position where the tip is retracted toward the second holding portion from the locked position.

The present invention provides a baffle plate that is easy to attach to a case.

FIG. 2 is a perspective view of an example baffle plate installed in a transmission case. FIG. 2 is a perspective view of a baffle plate according to an embodiment. FIG. 10 is a diagram for explaining a first rod. FIG. 10 is a diagram illustrating a second rod. FIG. 5(a) is a rear view of the baffle plate, and FIG. 5(b) is a front view of the baffle plate. 10A and 10B are diagrams for explaining the baffle plate mounting process.

Figure 1 is a perspective view of an embodiment of a baffle plate 10 attached to a transmission case 12. The baffle plate 10 is fixed to the case 12, divides the interior space of the transmission, and restricts the movement of oil within the transmission.

The case 12 has mounting holes 12a, an inner surface 12b, a raised portion 12c, and a through-hole portion 12d. The mounting holes 12a are formed on the inner surface 12b of the case 12 and are arranged coaxially in a pair to mount the baffle plate 10. The raised portion 12c is formed to raise the inner surface 12b of the case 12 and is located in one of the two internal spaces partitioned by the baffle plate 10. The baffle plate 10 is pressed against the raised portion 12c, which functions as a rotation stopper for the baffle plate 10. The through-hole portion 12d is formed on the bottom surface of the case 12. The baffle plate 10 is positioned between the raised portion 12c and the through-hole portion 12d.

The baffle plate 10 comprises a plate 20, a first rod 22a, a second rod 22b, and a seal 24. The plate 20 is formed in a roughly plate-like shape and is supported by the first rod 22a and the second rod 22b, and is fixed by being pressed against the raised portion 12c. The lower edge of the plate 20 is formed in an arc shape, and a seal 24 made of rubber, viscoelastic material, or the like is attached to it.

The first rod 22a is inserted into one of the mounting holes 12a, and the second rod 22b is inserted into the other mounting hole 12a. The first rod 22a and the second rod 22b (when not distinguished, they will be referred to as "rods 22") support the plate 20. The rod 22 biases the front side of the plate 20 so that the back side of the plate 20 presses against the raised portion 12c.

Figure 2 is a perspective view of the baffle plate 10 of the embodiment. Figure 3 is a diagram for explaining the first rod 22a. Figure 4 is a diagram for explaining the second rod 22b.

Figure 3(a) shows a front view of the first rod 22a, Figure 3(b) shows a top view of the first rod 22a, and Figure 3(c) shows a side view of the first rod 22a. The first rod 22a is formed by bending a metal wire. The first rod 22a has a tip end 60, a base end 62, and a bent portion 64. The tip end 60 is inserted into the mounting hole 12a.

The bent portion 64 includes a first extension portion 66a and a second extension portion 66b (referred to as "extension portion 66" when not distinguished), and is formed by connecting a pair of extension portions 66, forming a generally U-shape. The extension portion 66 extends in a direction intersecting the axial direction of the distal end portion 60 and the proximal end portion 62, and more preferably perpendicular to the axial direction of the distal end portion 60 and the proximal end portion 62. The axial direction of the distal end portion 60 may intersect with the axial direction of the proximal end portion 62. The first extension portion 66a and the second extension portion 66b have different lengths, with the first extension portion 66a being shorter than the second extension portion 66b. The first extension portion 66a and the second extension portion 66b extend in directions that intersect with each other.

In the free state shown in Figures 3(b) and 3(c), the tip end 60 and base end 62 are positioned offset in the axial direction. When the tip end 60 is inserted into the mounting hole 12a as shown in Figure 1, the tip end 60 and base end 62 are closer to each other in the axial direction than in the free state, and the first rod 22a generates a biasing force that presses the base end 62 against the plate 20. This rotational biasing force from the first rod 22a presses the plate 20 against the raised portion 12c, fixing the baffle plate 10 in a state where rattle is suppressed.

Figure 4(a) shows a front view of the second rod 22b, Figure 4(b) shows a top view of the second rod 22b, and Figure 4(c) shows a side view of the second rod 22b. The second rod 22b is formed by bending a metal wire. The second rod 22b has a tip end 68, a base end 70, and a bent portion 72. The tip end 68 is inserted into the mounting hole 12a.

The bent portion 72 is formed in a generally U-shape and includes an extension portion 74 that extends in a direction intersecting the axial direction of the tip portion 68 and base portion 70. In the free state, the tip portion 68 and base portion 70 are offset from each other when viewed in the axial direction. When the tip portion 68 is inserted into the mounting hole 12a as shown in Figure 1, the tip portion 68 and base portion 70 are closer together than in the free state, and the second rod 22b generates a biasing force that presses the base portion 70 against the plate 20.

Figure 5(a) is a rear view of the baffle plate 10, and Figure 5(b) is a front view of the baffle plate 10. The plate 20 has a first retaining portion 30, a second retaining portion 32, a third retaining portion 34, a first protrusion 36, a second protrusion 38, a third protrusion 40, a first retaining portion 42, a second retaining portion 44, a fourth protrusion 46, a fifth protrusion 48, a first elastic claw portion 50, a second elastic claw portion 52, and a convex portion 54.

The first holding portion 30, second holding portion 32, and third holding portion 34 hold the first rod 22a. The first holding portion 30 holds the base end 62 side of the first rod 22a, the second holding portion 32 holds the tip end 60 side of the first rod 22a, and the third holding portion 34 is located between the first holding portion 30 and the second holding portion 32. The second holding portion 32 is located closer to the mounting hole 12a, through which the first rod 22a is inserted, than the first holding portion 30.

As shown in Figure 2, the second retaining portion 32 has a larger diameter than the first retaining portion 30, and the first rod 22a is inserted through the second retaining portion 32 with a gap. On the other hand, the first retaining portion 30 has a larger diameter than the first rod 22a, but is approximately the same diameter. This allows the first retaining portion 30 to suppress any play at the base end 62 of the first rod 22a. Play at the tip end 60 of the first rod 22a is suppressed by the mounting hole 12a and the third retaining portion 34. The third retaining portion 34 is formed in an inverted L-shape and prevents the first rod 22a from moving away from the plate 20.

The first retaining portion 30, second retaining portion 32, and third retaining portion 34 pass through in the same axial direction as the mounting hole 12a and hold the first rod 22a so that it can move in the axial direction of the mounting hole 12a. Note that the axial direction of the mounting hole 12a and the axial directions of the first retaining portion 30 and second retaining portion 32 are the same, and are sometimes simply referred to as the "axial direction." The tip end 60 and base end 62 of the first rod 22a are also attached along the axial direction and are coaxial.

The first retaining portion 42 and the second retaining portion 44 retain the second rod 22b. The second retaining portion 44 is located closer to the mounting hole 12a, through which the second rod 22b is inserted, than the first retaining portion 42, and has a larger diameter than the first retaining portion 42.

The first protrusion 36, second protrusion 38, and third protrusion 40 protrude from the surface of the plate 20 and limit the axial movement of the first rod 22a. In the locked position shown in FIG. 1, the second protrusion 38 and third protrusion 40 function as first limiters that limit the axial movement of the first rod 22a. The second protrusion 38 abuts against the first extension 66a to limit the retraction of the first rod 22a, and the third protrusion 40 abuts against the second extension 66b to limit the advancement of the first rod 22a.

In the unlocked position shown in Figure 5(b), the first protrusion 36 and the second protrusion 38 function as second limiters that limit the axial movement of the first rod 22a. The first protrusion 36 abuts against the first extension 66a to limit the retraction of the first rod 22a, and the second protrusion 38 abuts against the first extension 66a to limit the advancement of the first rod 22a. In this way, the second protrusion 38 functions as both a first limiter and a second limiter.

The extension portion 66 engages with the first restricting portion (second protrusion 38 and third protrusion 40) in the locked position shown in FIG. 1, and engages with the second restricting portion (first protrusion 36 and second protrusion 38) in the unlocked position shown in FIG. 5(b). In this way, the first rod 22a is maintained in two positions, which limits movement of the first rod 22a during transport before attachment to the case 12. Furthermore, after the baffle plate 10 is attached to the case 12, movement of the first rod 22a out of the mounting hole 12a can be limited.

The fourth protrusion 46 and the fifth protrusion 48 protrude from the surface of the plate 20. The fourth protrusion 46 and the fifth protrusion 48 abut against a pair of extension portions 74 and function as third limiting portions that limit the forward and backward movement of the second rod 22b.

The first elastic claw portion 50 and the second elastic claw portion 52 are erected on the surface of the plate 20 and are flexible. The first elastic claw portion 50 engages with the bent portion 64 of the first rod 22a, preventing rotation of the first rod 22a around its axis. The second elastic claw portion 52 engages with the bent portion 72 of the second rod 22b, preventing rotation of the second rod 22b around its axis.

The protrusion 54 is formed on the generally arc-shaped edge 55 of the plate 20 and protrudes outward toward the inner surface 12b of the case 12. The seal 24 is provided on the generally arc-shaped edge 55 of the plate 20 and abuts against the inner surface 12b of the case 12. When the seal 24 is pressed against the inner surface 12b of the case 12 due to vehicle vibration or impact, the protrusion 54 abuts against the inner surface 12b, preventing excessive crushing of the seal 24.

The seal 24 is attached to the plate 20 by multiple mating portions 76. The mating portions 76 are formed as protrusions on the seal 24 and fit snugly into the plate 20.

Figure 6 is a diagram illustrating the process of installing the baffle plate 10. With the first rod 22a in the unlocked position shown in Figure 5(b), the worker hooks the bent portion 64 with a tool or the like, rotates the first rod 22a about its axis, and lifts the bent portion 64 shown by the solid line in Figure 6. Furthermore, when the first rod 22a is rotated, the first elastic claw portion 50 bends and releases the lock.

The bent portion 64, including the extension portion 66, assumes a position that allows it to overcome the first limiting portion (second protrusion 38 and third protrusion 40) and the second limiting portion (first protrusion 36 and second protrusion 38) when the first rod 22a rotates about its axis. This allows the first rod 22a to move axially, and as shown by the dashed line in Figure 6, it moves toward the mounting hole 12a, inserting the tip portion 60 into the mounting hole 12a.

After inserting the tip portion 60 into the mounting hole 12a, the worker rotates the bent portion 64 toward the plate 20, engaging the bent portion 64 with the first restricting portion (the second protrusion 38 and the third protrusion 40) in the locked position. In this way, the first rod 22a moves axially from the unlocked position in which the tip portion 60 is retracted toward the second retaining portion 32 relative to the locked position (see FIG. 5(b)), to the locked position in which the tip portion 60 of the first rod 22a is inserted into the mounting hole 12a (see FIG. 1). The worker can attach the baffle plate 10 by rotating and moving the first rod 22a, which is pre-assembled to the plate 20, making installation easy.

The second retaining portion 32 has a larger diameter than the first retaining portion 30. This allows any manufacturing error in the position of the mounting hole 12a to be absorbed, making it easier to insert the first rod 22a into the mounting hole 12a. Furthermore, the first rod 22a can bend within the second retaining portion 32, generating a biasing force that presses the plate 20 against the raised portion 12c.

The present invention is not limited to the above-described embodiments, and various design changes and other modifications may be made to each embodiment based on the knowledge of those skilled in the art. Such modified embodiments also fall within the scope of the present invention.

10 Baffle plate, 12 Case, 12a Mounting hole, 20 Plate, 22a First rod, 22b Second rod, 24 Seal, 30 First retaining portion, 32 Second retaining portion, 34 Third retaining portion, 36 First protrusion, 38 Second protrusion, 40 Third protrusion, 42 First retaining portion, 44 Second retaining portion, 46 Fourth protrusion, 48 Fifth protrusion, 50 First elastic claw, 52 Second elastic claw, 54 Convex portion, 60 Tip portion, 62 Base portion, 64 Bent portion, 66a First extension portion, 66b Second extension portion.

Claims (5)

A baffle plate attached to a mounting hole formed on the inner surface of a transmission case,
a rod whose tip is inserted into a mounting hole formed on the inner surface of the case;
a plate supported by the rod;
The plate is
a first holding portion that holds the rod;
a second holding portion that is located closer to the mounting hole than the first holding portion and that holds the rod,
the rod is held by the first holding portion and the second holding portion so as to be movable in the axial direction toward and away from the mounting hole,
The baffle plate is characterized in that the rod moves axially to a locked position in which the tip of the rod is inserted into the mounting hole and to an unlocked position in which the tip is retracted toward the second retaining portion further than the locked position. The plate is
a first limiting portion that limits axial movement of the rod at a lock position;
2. The baffle plate according to claim 1, further comprising: a second limiting portion that limits axial movement of the rod in the unlocked position. The rod is
at least one extending portion extending in a direction intersecting the axial direction, engaging with the first limiting portion in a locked position and engaging with the second limiting portion in an unlocked position;
The baffle plate according to claim 2 , wherein the extension portion is positioned so as to be able to overcome the first limiting portion and the second limiting portion by rotation of the rod about the axis. the rod has a substantially U-shaped bent portion including the extension portion and is formed of a wire material;
The distal end and the proximal end of the rod are positioned offset from each other in the axial direction in a free state,
4. The baffle plate according to claim 3, wherein the tip portion and the base end portion approach each other in the axial direction when the tip portion is inserted into the mounting hole, and the rod generates a biasing force that presses the base end portion against the plate. a seal portion provided on an edge of the plate and abutting against an inner surface of the case;
5. The baffle plate according to claim 1, wherein the plate has a protrusion that protrudes from the edge toward the inner surface of the case.