JPH084345Y2 - Gearbox support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a transmission supporting device for a vehicle frame.

[Prior Art] In a power unit equipped with a multi-speed transmission like a large vehicle, an internal combustion engine 32 and a clutch 33 are installed as shown in FIG.
The load on the rear mount 36 is heavy only by supporting the both side walls of the vehicle to the vehicle frame 2 by the two pairs of front and rear mounts 35 and 36.
The balance of the entire power unit becomes poor. Therefore, the transmission 34 is also supported on the vehicle frame 2 by the mount 37.

As shown in FIG. 3, the mounts 35 and 36 for supporting the internal combustion engine 32 and the clutch 33 include the internal combustion engine 32 and the clutch 3.
Arms 38 projecting from both sides from 3 are placed on the upper surface of the pad 40 of the vehicle frame 2 and fastened with bolts. A thick rubber cushion 39 is interposed between the pad 40 and the vehicle frame 2, and the internal combustion engine 32 is provided by the rubber cushion 39.
Vibration is suppressed.

As shown in FIG. 4, the mount 35 is formed by forming a metal plate into a tubular shape having an inverted trapezoidal cross section, and is provided with a bracket 19 having an upper wall 18, a lower wall 16 and a side wall 17. A flange 21 protruding upward from the end edge and a flange 20 protruding outward from the side wall 17 are joined to a plate surface of a vehicle frame (not shown). On the other hand, a wedge-shaped pad 40 is supported between a pair of block-shaped rubber cushions 39 obliquely connected to the inner surface of the side wall 17. In the groove on the horizontal plane of the pad 40, the arm 38 (the third
Figure) is supported. The rubber cushion 39 is actually divided into two rubber cushions 39a and 39b, and the reinforcing metal plate 12 is connected between them. Also, a pair of inner rubber cushions
39b are joined together and configured to cover the underside of pad 40.

As shown in FIG. 5, a transmission 34 lighter than the internal combustion engine 32.
In order to maintain the balance with the mounts 35 and 36, the mount 37 of FIG. The tip ends of the leaf springs 6 are mounted on the upper surface of a pad 5 having a wear-resistant cross-section, a semi-cylindrical hoop shape, such as cast iron, which is supported by the vehicle frame 2. The pad 5 is supported by the reinforcing plate 3 connected to the vehicle frame 2 via the bracket 4.

An example of a supporting device for a transmission shown in FIG.
As disclosed in Japanese Patent No. 57030, the pad 5 can be moved and adjusted in the vehicle width direction with respect to the vehicle frame 2 in order to balance the left and right load loads. However, it is very difficult to make an adjustment after it is attached, for example, when the pad 5 is worn. When the pad 5 wears, the leaf spring 6
The supporting point or the supporting surface of is lower. Internal combustion engine 32
If the supporting surface of the mount 37 becomes lower than the mounts 35 and 36 that support, the load on the mount 36 of the clutch 33 becomes large, and the housing of the clutch 33 (FIG. 3) may be cracked. Even if the tip portion of the leaf spring 6 is worn, the same phenomenon naturally occurs.

[Problems to be Solved by the Invention] An object of the present invention is to provide a support device for a transmission that does not increase the load on the mount of the engine against wear of pads and the like.

[Means for Solving the Problem] In order to achieve the above-mentioned object, in the structure of the present invention, a central portion of a leaf spring extending in the vehicle width direction is fixed to a transmission, and a tip portion of the leaf spring is fixed to a vehicle frame. The upper surface of the pad is placed so as to be slidable, and a plurality of protrusions that sequentially come into contact with each other on the center side of the leaf spring as the contact portion between the upper surface of the pad and the tip of the leaf spring wears, The tip portion is formed in a wavy shape.

[Operation] When the contact portion between the pad and the tip of the leaf spring, for example, the pad wears, the protrusion of the leaf spring that has been in contact with the pad is replaced by the protrusion closer to the center of the vehicle width than the protrusion. Touch the pad. At this time, the effective length of the leaf spring is shortened, the spring constant is correspondingly increased, and the load bearing capacity of the leaf spring is increased, so that the increase in the load bearing of the engine mount is suppressed. In other words, even if the amount of flexure of the leaf spring is smaller than that in the initial state, the shared load is secured.

[Embodiment of the Invention] As shown in FIG. 1, the pad 5 has a flange 5a integral with the pad 5 fixedly supported by the vehicle frame 2 as in the conventional example. According to the present invention, a plurality of protrusions 6a, 6b are formed at both ends of the leaf spring 6 supporting the transmission 34 by curving the ends in a wave shape in the longitudinal direction. In this case, the downward protrusion amount of the protrusion 6a on the tip end side of the leaf spring 6 is made larger than that of the protrusion 6b on the vehicle width center side. The number of protrusions is not limited to two, and many protrusions can be provided according to the width of the pad 5.

In the above structure, when the upper surface 31 of the pad 5 with which the protrusion 6a of the leaf spring 6 contacts is worn as shown by the broken line in FIG.
The protrusion 6b closer to the base end than the protrusion 6a comes into contact with the upper surface 31 of the pad 5. As a result, the effective length of the leaf spring 6 (the span of the leaf spring 6 in contact with the pair of left and right pads 5) is shortened. Therefore, although the height of the contact portion of the leaf spring 6 with the pad 5 is somewhat lowered, the spring constant is increased and the transmission is
As the load bearing capacity to support 34 is increased, internal combustion engine 32
The load on the mount 36 that supports the load is suppressed.

[Advantages of the Invention] As described above, the present invention mounts the center portion of the leaf spring extending in the vehicle width direction to the transmission so that the tip end portion of the leaf spring is slidably attached to the upper surface of the pad fixed to the vehicle frame. A plurality of protrusions that are sequentially contacted on the center side of the leaf spring as the contact portion between the upper surface of the pad and the tip of the leaf spring wears.
Since the tip of the leaf spring is formed by curving in a wavy shape, the leaf spring supporting the transmission is initially a protrusion on the tip side and comes into contact with the upper surface of the pad fixed to the vehicle frame. When the lower surface of the pad or the upper surface of the pad is worn, the projection on the base end side of the projection contacts the upper surface of the pad. With the movement of the contact surface between the projection of the leaf spring and the pad, the effective length of the leaf spring is shortened and the spring constant of the leaf spring is increased. It is possible to suppress an increase in load on the supporting mount.

Therefore, the power unit including the internal combustion engine, the clutch mechanism, and the transmission will continue to be supported in a good balance as a whole, and the balance of the clutch will be lost due to wear of the pads and the load of the clutch mount will be increased. It eliminates cracks in the mount rubber and cracks in the clutch housing.

[Brief description of drawings]

FIG. 1 is an enlarged front view of a main part of a transmission supporting device according to the present invention, FIG. 2 is a side view showing a schematic configuration of a supporting device for a vehicle frame of a general power unit, and FIG. FIG. 4 is a front view showing a schematic configuration of a mount of the engine, FIG. 4 is an enlarged side view of the clutch mount, and FIG. 5 is a front view of a support device for the transmission. 5: Pad, 6: Leaf spring, 6a, 6b: Projection, 34: Transmission, 37: Mount

Claims (1)

[Scope of utility model registration request] 1. A central portion of a leaf spring extending in the vehicle width direction is fixed to a transmission, and both end portions of the leaf spring are placed on the upper surface of a pad fixed to a vehicle frame so as to be slidable. A plurality of protrusions, which sequentially come into contact with each other on the center side of the leaf spring as the contact portion between the upper surface of the leaf spring and the tip end of the leaf spring wears, are formed by curving the tip end of the leaf spring into a wavy shape. Machine support device.