JP3464017B2 - Rotation transmission device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotation transmitting device used for switching between transmission and interruption of driving force to wheels on a driving path of a vehicle. 2. Description of the Related Art Generally, an automobile is mainly used for moving forward, and retreating is used only for a very limited time. Hitherto, the present applicant has proposed a device in which transmission of driving force to a front wheel and a rear wheel of an automobile is switched by a mechanical clutch in accordance with such an application in Japanese Patent Application No. Hei 4-173064. This device, as shown in FIGS. 2 to 4,
An outer ring 1 serving as a driven side and an inner member 2 serving as a driving side are rotatably fitted inside and outside, and a large-diameter cage 3 and a small-diameter cage 4 are provided between the outer ring 1 and the inner member 2. A sprag 5 as an engaging element for engaging the outer race 1 and the inner member 2 is incorporated in pockets provided in the retainers 3 and 4. Further, the large-diameter cage 3 is connected to the pin 6 and the square hole 17.
Is connected to the inner member 2 with a clearance X in the rotational direction, and a C-shaped ring-shaped switch spring 7 is attached between the large-diameter cage 3 and the small-diameter cage 4.
The unidirectional rotation resistance is given to the large-diameter cage 3 by the spring force of. Further, a one-way clutch 8 is press-fitted into the other end of the large-diameter retainer 3 via an input ring 10, and a rotational resistance which generates a rotational resistance in a direction opposite to that of the switch spring 7 is applied to the input ring 10. When the rotation direction of the inner member 2 changes, the one-way clutch 8 is operated to switch the direction in which the rotation resistance acts on the large-diameter cage 3. The above-described proposed rotation transmitting device A is provided on a front wheel propulsion shaft B which branches the inner member 2 from a transfer C in a drive path of a four-wheel drive vehicle having a rear wheel as a main drive wheel as shown in FIG. The outer ring 1 is connected to the front differential D and mounted. In this mounted structure, when the vehicle is in the forward direction, the switch spring 7 is set in a contracted state as shown in FIG. 4, and one end is held in the large-diameter holder 3 and the other end is held in the small-diameter holder. A force in the direction of the arrow is generated by pressing against the container 4, and the force causes the phases of the two retainers 3, 4 and the operation state of the sprag 5 to stand by in the forward direction (FIG. 6). On the other hand, when retreating, the input ring 10 engages with the one-way clutch 8 and makes the same rotation as the propeller shaft E. At this time, the input ring 10 and the housing 11 which is a fixing member are connected to the retaining ring 12. Are pressed against each other by the disc spring 13 fixed by the above, a brake torque is generated such that the large-diameter cage 3 is delayed with respect to the small-diameter cage 4 due to the rotational resistance due to the slip. That is, when the inner member 2 and the small-diameter retainer 4 rotate during retreat, the large-diameter retainer 3 is restrained by the brake torque, and the brake torque reduces the switch spring 7 to a retracting side (hereinafter referred to as reverse travel). If the switching torque is larger than the switching torque, the phases of the large-diameter cage 3 and the small-diameter cage 4 are set in the reverse direction. Here, by setting the relationship of brake torque> reverse switching torque, the switch spring 7 is further contracted until the large-diameter cage 3 reaches the reverse standby position, as shown in FIG. Thereafter, the input ring 10 makes the same rotation as the propeller shaft E while sliding between the input ring 10 and the housing 11. [0011] By the way, in the above-described drive path, when the vehicle travels with the transmission of the driving force separated on the transfer side (ie, when traveling in the two-wheel drive state), the rotational power from the tires is reduced by the front wheels. Of the rotation transmitting device A through the wheel hub (locked state) → drive shaft → front differential. When the vehicle travels in the forward direction in this state, since the sprags 5 are in the forward standby state in the state shown in FIG. 6, the outer ring 1 only idles with respect to the inner member 2. However, when the vehicle runs in the backward direction, the outer wheel 1 tries to rotate the inner member 2 via the sprag 5 in the forward standby state. However, large diameter cage 3
Is connected to the one-way clutch 8 and, when rotating in the reverse direction, receives rotation resistance (brake torque) generated by the rotation resistance applying means 9 due to the engagement of the one-way clutch 8. Therefore, when the input shaft is to be turned from the outer ring via the sprags, the members excluding the large diameter cage 3 are integrated, and the sprags 5 interfere with the large diameter cage 3 as shown in FIG. When the positional relationship as shown in the figure is reached, the sprags are pushed by the above-described rotational resistance by the end face of the large-diameter retainer 3, and the engagement state of the inner member-sprag-outer ring is illustrated. Once released as in 8. In this case, since the driving force (resistance) in the retreating direction is not applied to the inner member 2, the two retainers 3, 4 are moved forward at the moment when the contracted switch spring 7 is released from the engagement state. The phenomenon of spreading in the direction of standby occurs. In other words, the once released engagement attempts to immediately return to the original forward engagement state, and the engagement and release are instantaneously and continuously performed, thereby generating an abnormal sound. An object of the present invention is to solve the above-mentioned problems and to provide a rotation transmitting device free from abnormal noise. In order to solve the above-mentioned problems, the present invention is directed to a driving member and a driven member which are rotatably fitted inside and outside, and a driving member and a driven member are provided between opposed surfaces of the driving member and the driven member. A retainer is provided, and a pocket formed in the retainer incorporates an engaging element for engaging the drive member and the driven member when the retainer and the drive member are relatively rotated in the forward and reverse directions. Two resistance generating means for providing rotational resistances in opposite directions to each other and a one-way clutch for switching the action direction of the rotational resistance are connected, and the retainers are shared with the driving member with a delay with respect to the forward and reverse rotation directions. In the rotation transmitting device connected so as to rotate, between the driving member and the driven member,
An elastic member for providing rotational resistance is provided, and the resistance of the elastic member is set to be larger than one rotational resistance of the resistance generating means. When the elastic member is incorporated between the driving member and the driven member as described above, when a rotational force in the backward direction is input from the driven member side, the resistance of the elastic member is applied to the driving member and the retainer. With this addition, the phase of the cage with respect to the driving member can be switched to the reverse side. Therefore, the engaging element is always prepared to be engaged in the rotating direction of the driving member, and the engaging and releasing of the engaging element as described above is not instantaneously performed, and occurrence of abnormal noise is prevented. Is done. FIG. 1 shows a rotation transmission device according to an embodiment. The basic structure of this embodiment is the same as that of the device described in the section of the prior art, and the same components are denoted by the same reference numerals and description thereof will be omitted. Here, the features of the embodiment will be described. . As shown in the figure, in this embodiment,
An elastic member 14 made of a disc spring is incorporated between the end wall 1a of the outer race 1 as a driven member and the end wall 2a of the inner member 2 as a driving member. The elastic member 14 is inserted between the outer ring 1 and the inner member 2 in a compressed and deflected state, and presses the outer ring 1 and the inner member 2 so as to separate them by a spring force. , So that the outer ring 1 and the inner member 2 rotate together. In this case, the pressing resistance P of the elastic member 14
₁ is set to be larger than the backward switching torque P ₂ acting on the large-diameter retainer 3 (P _1> P ₂₎ by a switch spring 7. In the rotation transmitting device according to the embodiment having the above-described structure, the inner member 2 and the small-diameter retainer 4 rotate together when the outer ring 1 rotates due to the resistance caused by the pressing of the elastic member 14. I will put it. In addition, large diameter cage 3
Since the movement is restricted by the brake torque of the rotation resistance applying means 9 and the pressing resistance of the elastic member 14 is set to be larger than the reversing switching torque of the switch spring 7, When a force for rotating the member 2 is applied, the inner member 2 and the small-diameter retainer 4 are rotated by the pressing resistance, and the phases of the retainers 3 and 4 and the sprags 5 stand by in the retreating direction. For this reason, if the outer ring 1 continues to rotate in the retreating direction, the outer ring 1
Is in an overrunning state with respect to the input side (inner member 2), so that the sprags 5 do not repeatedly engage and disengage, and no abnormal noise is generated. Further, when a resistance is generated between the outer wheel 1 and the inner member 2 by the elastic member 14, when the wheel hub of the front wheel is locked and the vehicle is driven in the two-wheel drive state, the inner wheel 2 moves from the outer wheel 1 in the forward direction. The direction member 2 can be rotated, and both members rotate the same. Therefore, there is an advantage that the abrasion of the sprag 5 can be suppressed since the sprag 5 sandwiched between the two members does not slip. In addition, by incorporating the elastic member 14, an axial repulsive force acts on the outer ring 1 and the inner member 2. The repulsive force applies an axial preload to bearings 15 and 16 supporting the outer ring 1. It acts to add and the radial clearance of each bearing 15, 16 is killed. For this reason, there is an effect that the rotational balance of the bearings 15 and 16 is improved, and accordingly, vibration can be reduced. In the structure of the above embodiment, the outer ring 1
A sprag that can be engaged only by rotation in one direction may be alternately symmetrically incorporated between the inner member 2 and the inner member 2. Further, the engaging element may be a roller instead of the sprag, and an engaging surface for engaging with the roller may be provided on a surface facing the outer ring and the inner member. As described above, according to the present invention, the elastic member for providing resistance is provided between the driving member and the driven member, and when the force for rotating the driving member acts from the driven member, the resistance of the elastic member causes Since the engagement operation state of the engagement element is switched, the engagement element does not repeatedly engage and disengage instantaneously, and occurrence of abnormal noise can be prevented.

[Brief description of the drawings] FIG. 1 is a longitudinal sectional front view showing an embodiment. FIG. 2 is a longitudinal sectional front view showing a conventional example. FIG. 3 is a sectional view taken along line III-III in FIG. 2; FIG. 4 is a sectional view taken along the line IV-IV in FIG. 2; FIG. 5 is a sectional view showing an operation state of a switch spring. FIG. 6 is a sectional view showing an operation state of a sprag. FIG. 7 is a sectional view of another operating state of the above. FIG. 8 is a sectional view of another operating state of the above. FIG. 9 is a schematic diagram showing a driving route of a vehicle. [Explanation of symbols] 1 outer ring 2 Inner members 3 Large diameter cage 4 Small-diameter cage 5 Sprag 7 Switch spring 8 One-way clutch 9 Rotational resistance applying means 10 Input ring 14 Elastic member A rotation transmission device

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) F16D 41/00-47/06 B60K 23/00-23/08

Claims (1)

(57) Claims 1. A driving member and a driven member are rotatably fitted inside and outside, and a retainer is provided between opposing surfaces of the driving member and the driven member. An engaging element for engaging the driving member and the driven member when the retainer and the driving member relatively rotate in the forward and reverse directions is incorporated into the formed pocket, and imparts rotational resistances in opposite directions to the retaining member. In a rotation transmission device in which two resistance generating means and a one-way clutch for switching the action direction of the rotation resistance are connected, and the retainer is connected to the driving member so as to co-rotate with a delay with respect to the forward and reverse rotation directions, respectively. Between the driving member and the driven member,
A rotation transmitting device, comprising: an elastic member for providing a rotational resistance, wherein the resistance of the elastic member is set to be greater than one rotational resistance of the resistance generating means.