JPH0316751Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a dynamic damper installed in a transmission of an automobile power train.

(Prior Art) Various dynamic dampers of this type have been proposed so far, but they can be roughly classified into the following two types based on how they are attached to the power train. The first is a dynamic damper that protrudes from the power train.
−15453 Publication, U.S. Patent No. 3447638 and
Disclosed in No. 3232384. Part 2 is a system in which a dynamic damper is arranged coaxially with the power train, and the application filed by the applicant in 1983-
Disclosed in No. 190366.

(Problems to be Solved by the Invention) The former of the above conventional examples is, in short, a dynamic damper provided on one side of the extension housing of the power train. By the way, in order to increase the vibration damping effect of the dynamic damper,
It is necessary to increase the mass as much as possible, provide strength to the supporting portion of the dynamic damper, and provide sufficient fastening strength to the bolts used to attach the dynamic damper.

However, the conventional example described above does not satisfy these requirements.

Further, the latter has a ring-shaped weight and damper rubber provided on the outer circumferential side of the extension housing, but there were problems with the durability of the damper rubber and the fastening strength of the bolts.

The present invention was devised to solve this problem, and its object is to provide a dynamic damper for an automobile power train that can increase the vibration damping effect.

(Means for Solving the Problems) The present invention has a U-shaped cross-sectional shape for accommodating weights via damper rubber on one side of the extension housing of an automobile power train. A retainer is attached that integrates a housing part and a mounting part formed by bending a part of the upper end of this housing part outward, and the tightening direction of the bolt that fastens the mounting part of the retainer is the vibration direction of the dynamic damper. It is characterized by:

(Function) Since the present invention is configured as described above, the housing portion and the attachment portion are integrated, and the rigidity of the retainer is improved. Furthermore, since the tightening direction of the bolts for attaching the retainer is the vibration direction of the dynamic damper, the tightening strength of the bolts is improved. The synergistic effect of increasing the rigidity of the retainer and increasing the fastening strength of the bolts allows the use of larger weights and improves the vibration absorption effect.

(Example) An example of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a front-wheel drive power train, 2 is a differential, 3 is an axle shaft, and 4 is a flange attached to the axle shaft. The other flange is omitted in the figure. 5 is a ring gear, and a driven shaft 6 is gear-coupled to this ring gear, and this driven shaft 6 is housed in a cylindrical extension housing 7 and is rotatably supported by the extension housing 7 via roller bearings 8 and 9. has been done.

Reference numeral 10 denotes a dynamic damper attached to one side of the distal end of the extension housing 7, and is shown as viewed from the - line in FIG. This dynamic damper 10
is a retainer 11, a weight 12, and a damper rubber 1.
As shown in FIGS. 2 and 3, the retainer 11 is formed by a housing portion 15 having a U-shaped cross section, and a portion of the upper end portion of the housing portion 15 bent outward. The partition wall 15 of the housing portion 15 is composed of a pair of opposing mounting portions 11b.
A plate-shaped weight 1 is placed in the center between a and 15a.
2 are arranged, and this weight 12 and the partition wall 15a,
A damper rubber 13 for fixing the weight 12 is provided between the damper rubber 15a and the weight 12. The damper rubber 13 has thin adhesive parts 13a, 13a that extend along the inner surfaces of the partition walls 15a, 15a and whose lower ends reach the bottom surface, a thin holding part 13b that covers the circumferential surface of the weight 12, and adhesive parts 13a, 13a and 13a. It consists of thick connecting parts 13c, 13c that connect the holding parts 13b, and is located on the upper end surface of the connecting parts 13c, 13c below that of the weight 12, and is inclined so that the sticking parts 13a, 13a side is lower. I'm forced to. Connecting part 13
A gap g is formed between the lower end surfaces of c and 31c that are parallel to the upper end surfaces and the bottom surface of the housing portion 15. The reason why the upper and lower end surfaces of the connecting parts 13c, 13c are inclined in this way is to absorb vibrations in the shearing direction with respect to the vibration direction of the extension housing 7 (direction perpendicular to the plane of the paper in FIG. 1). By doing so, the durability of the damper rubber 13 is improved.

Extension housing 7 of retainer 11
For installation, a bolt 17 is passed through the bolt hole 16 formed in each of the pair of mounting parts 11b, and
Further, each bolt 17 is screwed into a threaded portion 18 formed on the extension housing 7. At this time, it is important to make the axis of the bolt 17 almost coincide with the vibration direction of the extension housing 7, that is, the vibration direction of the dynamic damper 10. By doing this, the bolt 17 is forced only in the direction of its axis. Therefore, the loosening of the bolt 17 is suppressed as much as possible, and the fastening strength of the bolt 17 is improved.

In this way, by forming the retainer 11 as a single integral member, its rigidity is increased and the fastening strength of the bolt 17 is improved, so the weight of the weight 12 is increased and the vibration absorption effect is improved. becomes possible.

In order to increase the weight of the weight 12, as shown in FIG. 2, a part of the bottom surface of the accommodating portion 15 is opened to form an opening 19, and the weight 12 is made to protrude from this opening 19. . In the figure, the two-dot chain line indicates the bottom surface of the weight 12, and shows the state before the weight is increased. In addition, 20
is a dust cover attached to the tip of the driven shaft 6, and a propeller shaft (not shown) is connected to the tip of the driven shaft 6.

Figures 4 and 5 compare the case where the dynamic damper of the above configuration is installed and the case where it is not installed. Figure 4 shows the vibration mode with respect to the vibration level of the extension housing 7. The axis represents the engine speed (rpm). FIG. 5 shows the sound pressure level inside the vehicle, with the horizontal axis representing the vehicle speed and the vertical axis representing the sound pressure. Note that in FIGS. 4 and 5, curve A shows the state in which the dynamic damper is not installed, and curve B shows the state in which the dynamic damper is installed. As is clear from the figure,
The purpose of the dynamic damper has been fully achieved, and it has been demonstrated that its lifespan is more than 10 times longer than that of conventional models.

(Effects of the invention) The present invention increases the rigidity by integrally molding the housing part and the mounting part of the retainer, and also increases the fastening strength by setting the tightening direction of the retainer mounting bolt in the vibration direction of the dynamic damper. Since it is made larger, a large weight can be used. This makes it possible to improve the vibration absorption effect of the dynamic damper.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of the power train showing the mounting position of the dynamic damper according to the present invention, and Fig. 2 is a view showing the dynamic damper according to the present invention, as seen from the - line in Fig. 3. , FIG. 3 is a view taken from the - line in FIG. 1,
FIGS. 4 and 5 are graphs comparing vibration modes and sound pressure levels when a dynamic damper is installed and when a dynamic damper is not installed, respectively. 1... Power train, 7... Extension housing, 11... Retainer, 12... Weight, 13... Damper rubber.

Claims (1)

[Scope of utility model registration request] An accommodating section formed in a U-shape in cross section for accommodating a weight via a damper rubber is provided on one side of the distal end of an extension housing for an automobile power train, and a part of the upper end of this accommodating section is removed. A dynamic power train for an automobile, characterized in that a retainer is attached to which an attachment part formed by bending in a direction is attached, and a bolt for fastening the attachment part of the retainer is tightened in the direction of vibration of a dynamic damper. damper.