JPS6242190B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gear rattle prevention device for a transmission used in construction vehicles such as wheel loaders, graders, bulldozers, forklifts, and other vehicles.

A conventional example of the auxiliary transmission used in the above-mentioned construction vehicles is as shown in Fig. 1, in which one end is connected to the engine via a propeller shaft, clutch, etc. (not shown). 2 is a hub spline-fitted to the input shaft 1; 3 is an output gear rotatably supported by a case 5 via a bearing 4;
The other end side is connected to the main transmission via a follow shaft (not shown), etc., and the shaft 8 supported by the case 5 via bearings is connected to the counter gear 6 via bearings 7, 7. and the teeth 6a of the counter gear 6 are connected to the output gear 3.
The sliding gear 9 is meshed with the hub 2 at all times to form a variable speed gear set, and the sliding gear 9 is slidably spline-fitted to the hub 2 and slid from side to side. The structure is such that two gears are obtained by meshing with the third dog tooth 3a.

Therefore, in the conventional auxiliary transmission described above, when the sliding gear 9 is in mesh with the dog teeth 3a of the output gear 3 as shown in FIG. 1, the driving force from the engine is transmitted through the clutch and the propeller shaft. The transmission function is transmitted to the input shaft 1, transmitted from the input shaft 1 to the output gear 3 via the hub 2, and the sliding gear 9, and then input from the output gear 3 to the main transmission via the follow shaft, and the sliding gear 9. Slide the counter gear 6
The counter gear 6 is interposed between the sliding gear 9 and the output gear 3 to provide a speed change function.

However, in the conventional transmission described above, when the sliding gear 9 is engaged with the dog teeth 3a to directly transmit power to the output gear 3,
The counter gear 6, which is constantly meshed with the output gear 3 through the teeth 6a, is driven by the output gear 3 and idles.If the engine speed is set to idling in this state, the engine output will decrease due to the general characteristics of the engine. As the fluctuation in the angular velocity of the shaft increases, the counter gear 6 pulsates in the rotation direction by the amount of backlash, which causes the teeth of the counter gear 6 and the teeth of the output gear 3 meshing therewith to collide, resulting in gear rattling noise. There is a problem that occurs.

The present invention aims to solve the above-mentioned difficulties in conventional transmissions, and provides a transmission equipped with a gear set consisting of an output gear and a counter gear that is rotated in mesh with the output gear.
A weight is rotatably fitted to the counter gear, and a spring is attached to the weight to press the weight against the side of the counter gear, so that the weight causes the counter gear to rotate steadily in a certain direction. The structure is characterized by a structure in which a force is applied, and in addition to the above-mentioned features, a friction plate is interposed between the weight and the side of the counter gear, and the weight applies the force to the counter gear through the friction plate. It is characterized by applying steady rotational force in a certain direction to the counter gear, and its purpose is to be able to be easily incorporated into existing equipment without requiring special space. Another object of the present invention is to provide a gear rattling noise prevention device for a transmission that can prevent gear rattling noise at a meshing portion between a counter gear and an output gear.

The present invention has the above-mentioned configuration, and in a state where the sliding gear meshes with the teeth of the output gear, the counter gear that is meshed with the output gear and idles is rotatably fitted into the counter gear. The difference in angular velocity between the weight and the
The force of the spring pressing the weight against the counter gear and the inertia of the weight provide a steady rotational force in a certain direction, and this steady rotational force keeps the teeth of the counter gear always in contact with the teeth of the output gear. This makes it possible to prevent the occurrence of hammering sounds between the tooth surfaces.

Furthermore, in the present invention, by adding a configuration in which a weight is fitted to the counter gear and a spring is attached, it is possible to prevent the occurrence of gear rattling noise, and the size of the existing transmission can be reduced without requiring special space. It has excellent versatility and allows the above-mentioned configuration to be incorporated extremely easily without modification.

Furthermore, in the present invention, since the friction plate is interposed between the weight and the side part of the counter gear, the coefficient of friction between the weight and the side part of the counter gear is stabilized and is applied to the counter gear. The steady rotational force is always constant, and the above-mentioned effect of preventing the occurrence of gear rattling noise is further improved.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 2 shows a first embodiment of the present invention, in which 1 is an input shaft, and 2 is an input shaft 1.
3 is an output gear rotatably supported by the case 5 via a bearing 4; 3a is a dog tooth of the output gear 3; 8 is a shaft rotatably supported by the case 5 via a bearing. , 16 is a counter gear rotatably supported by the shaft 8 via bearings 7, 7, and teeth 16a of the counter gear 16 are always meshed with the output gear 3 and also meshed with the sliding gear 9. The sliding gear 9, which is provided with the teeth 16b and is slidably spline-fitted to the hub 2, is slid to connect the dog teeth 3a or the teeth 1.
In this embodiment, a gear 10 is spline-fitted to one end of the counter gear 16 to form the teeth 16b described above. At the same time, the weight 12 is rotatably fitted onto the counter gear 16, and a friction plate 13 is provided between one side of the weight 12 and the side of the gear 10 forming the side of the counter gear 16.
, and a disc spring 14 is rotatably provided between the other side of the weight 12 and the other side of the counter gear 16. Since the first embodiment shown in FIG. 2 has the above-described structure, the sliding gear 9 is slid left and right, and the dog teeth 3a of the output gear 3 and the teeth 16b of the counter gear 16 are alternately connected to each other. By meshing with the sliding gear 9, it is possible to obtain a two-speed shift, and the basic shift function is the same as that of the conventional example shown in FIG. Dog tooth 3a of output gear 3
When inputting the driving force from the engine to the main transmission via the clutch (not shown), the propeller shaft, the input shaft 1, the hub 2, the dog teeth 3a, the output gear 3, and the follow shaft (not shown) , counter gear 16
Since it is always meshed with the output gear 3, it is driven by the output gear 3 and rotates idly, and at the same time, the gear 10 is also rotated integrally with the counter gear 16.

By the way, when the rotational speed of the engine is brought to an idling state in the meshed state described above, the engine output shaft fluctuates greatly due to the general characteristics of the engine, so the angular velocity of the counter gear 16 also fluctuates greatly. 12. The friction plate 13 is rotatably fitted onto the counter gear 16, and by appropriately setting the pressing force of the disc spring 14, the counter gear 16 is prevented from rotating integrally with the gear 10. Due to the inertial force, a steady rotational force in a certain direction is applied to the object to cause it to rotate at a constant angular velocity. Therefore, a difference in angular velocity occurs between the weight 12, the friction plate 13, and the counter gear 16 and gear 10.

Also, due to the pressing force of the disc spring 14, the weight 12
is pressed against the side surface of the gear 10 via the friction plate 13, the difference in angular velocity, the pressing force, and the inertial force of the weight 12 cause the teeth 16a of the counter gear 16 and the teeth of the output gear 3 meshing with the teeth 16a of the counter gear 16 to The teeth try to maintain a contact state at all times, and the generation of the above-mentioned hammering sound between the tooth surfaces is prevented.

Therefore, in the first embodiment described above, it is possible to prevent gear rattling noise due to the meshing of the counter gear 16 and the output gear 3, and it is possible to change the size of the existing transmission without requiring a special space. In addition, when the friction plate 13 is installed as described above, the friction plate 13 can be used to prevent the weight 12 and Counter gear 16 i.e. its gear 1
0 becomes stable, the steady rotational force applied to the counter gear 16 is always substantially constant, and the effect of preventing gear rattling noise is further improved.

In addition, although a friction plate is interposed in the above embodiment, it is also possible to create a structure in which frictional contact is made between the sides of the weight and the gear without using a friction plate, and even in this case, the original You can achieve your goals and effects.

Next, a second embodiment of the present invention is shown in FIG. 3, and compared to the first embodiment described above, the friction plate 13 of the first embodiment is not provided, and the disc spring 14 is not provided with the friction plate 13 of the first embodiment. Instead, a thrust washer 23 is interposed between the other side of the weight 12 and the other side of the counter gear 16, and a compression spring 2 is inserted between the thrust washer 23 and the hole 12a of the weight 12.
The second embodiment differs from the first embodiment in that the structure includes a numeral 4, and other structures are the same as those of the first embodiment, as indicated by the same reference numerals. Therefore, also in this second embodiment,
It is possible to achieve substantially the same effects as in the case of the first embodiment.

In addition, in the above-mentioned first example and second example,
Although the weight is shown to be fitted directly onto the counter gear, it is also possible to have a similar structure in which the weight is placed adjacent to the left side of the gear 10 and fitted indirectly to the counter gear 16. be.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view of a conventional transmission (the upper side of the input shaft is omitted), Fig. 2 is a longitudinal sectional view showing a first embodiment of the present invention with the upper part omitted, and Fig. 3 FIG. 2 is a vertical cross-sectional view showing a second embodiment of the present invention. 1: Input shaft, 2: Hub, 3: Output gear, 6, 16: Counter gear, 8: Shaft, 9: Sliding gear, 12: Weight, 13: Friction plate, 14: Belleville spring, 23: Thrust washer, 24: Compression spring.

Claims (1)

[Scope of Claims] 1. In a transmission equipped with a gear set consisting of an output gear and a counter gear that is rotated in mesh with the output gear, a weight is rotatably fitted to the counter gear, and the weight is rotatably fitted to the counter gear. A gear hammering prevention device for a transmission characterized in that a spring is provided for pressing the weight against the side of the counter gear, and the weight applies a steady rotational force in a certain direction to the counter gear. . 2. In a transmission equipped with a gear set consisting of an output gear and a counter gear that is rotated in mesh with the output gear, a weight is rotatably fitted to the counter gear, and the weight is attached to the counter gear. Further, a friction plate is interposed between the weight and the side of the counter gear, so that the weight applies force to the counter gear in a certain direction via the friction plate. A transmission gear knocking noise prevention device characterized by a configuration that provides steady rotational force.