JPH028105Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a pawl clutch.

A pawl clutch has a drawback in that the pawls move in the circumferential direction when engaged due to torque fluctuations on the prime mover, ie, engine side, producing a tapping sound. The present invention has been made with the aim of reducing the swinging of the nails and the hammering noise.

In order to achieve the above objectives, this invention
One of the driving side and the driven side is provided with a clutch dog that is slidable relative to the transmission shaft, and the other side is provided with a clutch body that meshes with the clutch dog, and the sliding surface of the clutch dog and the transmission shaft is provided with a clutch body that meshes with the clutch dog. An engagement groove is formed on one of the surfaces, and the other surface is engaged with the engagement groove by the biasing force of an elastic body when the clutch is engaged,
and a first engaging portion is provided in which the biasing force of the elastic body acts to move the clutch dog toward the other clutch body through the inclined surface;
A conical friction surface is provided on one side of the clutch body, and a synchronizer is provided on the other side of the clutch dog, which rotates together with the clutch dog and slides into contact with the conical friction surface prior to the clutch dog meshing with the clutch body. In a device in which a friction cone body for engagement is mounted so as to be freely movable in the axial direction, the clutch dog and the friction cone are arranged so that when the clutch is engaged, the friction cone body is pressed against the conical friction surface by the urging force of the first engagement portion. An engaging groove is provided on one side of the body, and a detachable second body is provided with an engaging groove on the other side and engages with the engaging groove by the biasing force of an elastic body to restrain the friction cone body in the axial direction with respect to the clutch dog. The present invention is characterized in that it is provided with an engaging body.

Hereinafter, the structure of the present invention will be explained based on an illustrated embodiment. In FIG. The end of the input shaft 2 is inserted into and supported by the end of the output shaft 3 so as to be freely rotatable. A clutch dog 4 is externally fitted onto the input shaft 2 via a spline 5 so as to be able to freely slide in the axial direction. 2
As shown in the figure, clutch pawls 7 and 8 are formed respectively, and by sliding the clutch dog 4, these clutch pawls 7 and 8 are engaged and disengaged from each other, and power is transferred from the input shaft 2 to the output shaft 3. It's starting to fit in and out.

As shown in FIG. 3, the input shaft 2 is formed with a ball hole 9 passing through it in the diametrical direction. Balls 11, 11 are inserted. On the other hand, a pair of engagement grooves 12 and 13 are formed on the inner periphery of the clutch dog 4 so as to face the ball hole 9 and spaced apart in the axial direction. Of these, the engagement groove 12 located on the output shaft 3 side is used to maintain the clutch dog 4 in the neutral state, and when the clutch dog 4 is in the neutral state, the detent ball 11 engages with this engagement groove 12 to move the clutch dog 4 in the axial direction. Detain. On the other hand, the other engagement groove 13 is for maintaining engagement when the clutch is engaged, and as shown in FIG. 4, when the clutch dog 4 is slid and its claw 7 is engaged with the mating clutch claw 8, , the detent ball 11 is
Although the detent ball 11 engages with this engagement groove 13 for mesh retention, at that time, the detent ball 11 does not completely engage with the engagement groove 13 and rides on the inclined surface 13a on the output shaft 3 side. , the detent ball 11 energized by the spring 10 moves along this inclined surface 13a.
Due to this action, the clutch dog 4 is held so as to act as a force that pushes the clutch dog 4 toward the mating clutch pawl 8 side. In this specification, this engaging portion when the clutch is engaged is referred to as a first engaging portion A.

Next, on the output shaft 3, on the outer periphery of the large diameter end 6,
A conical friction outer circumferential surface 14 is formed. On the other hand, a spline 15 is formed on the outer periphery of the clutch dog 4, and a friction cone body 1 is formed on this spline 15.
6 is fitted onto the clutch dog 4 so as to be slidable in the axial direction, and further includes the conical friction outer circumferential surface 14.
A conical friction inner circumferential surface 17 is formed which slides into contact with. A guide hole 18 is formed through the friction cone body 16 in the radial direction.
As shown in FIG. 3, an engaging pin 20 having an inclined surface 19a at its tip is slidably inserted therein. Reference numeral 21 denotes a spring holder fitted externally to the friction cone body 16, and the tip of this spring holder 21 closes the guide hole 18, and the spring holder 2
1 and the engaging pin 20, the engaging pin 20
A spring 22 is interposed to urge the clutch dog 4 in a radial direction, that is, toward the sliding surface with the clutch dog 4. On the other hand, a pair of conical pin engagement grooves 23 and 24 are formed on the outer periphery of the clutch dog 4, facing the engagement pin 20 and spaced apart in the axial direction. 23 and 24 are respectively provided with inclined surfaces 23a and 24a that match the inclined surface 19a of the engagement pin 20 in the axial direction. Of these pin engaging grooves 23 and 24, the pin engaging groove 23 located on the output shaft 3 side is used to maintain the neutral position of the friction cone body 16, and the other pin engaging groove 24 is used to maintain the neutral position of the friction cone body 16 when the clutch is engaged. It is used to hold the friction cone body 16.
That is, in the neutral state, the engaging pin 20 engages with the neutral holding pin engaging groove 23, and when the clutch is inserted, the engaging pin 20 engages with the neutral holding pin engaging groove 24 as shown in FIG. which engages with,
In the present specification, the meshing position holding pin engagement groove 24 and the engagement pin 20 are paired as a second engagement part B, and the neutral position holding pin engagement groove 23 and the engagement pin 20 are referred to as a pair. The pair will be referred to as a third engaging portion C.

Now, to explain the operation based on the above configuration, first, the clutch dog 4 is slid from the neutral position shown in FIG. 3 toward the output shaft 3 side by the shifter 25 and the like engaged with the clutch dog 4. At the same time, the engagement pin 20 and the neutral position holding engagement groove 2
3 is engaged, the friction cone body 16
similarly slide together in the axial direction, and first, the conical friction inner circumferential surface 17 of the friction cone body 16 touches the output shaft 3.
The output shaft 3 comes into sliding contact with the conical friction outer circumferential surface 14 on the side, thereby causing the output shaft 3 to start rotating. When the clutch dog is further pushed in from this state, the rotation on the output shaft 3 side increases and becomes a synchronous rotation state.
The engagement pin 20 is pushed into the guide hole 18 by the action of the engagement pin 20 and the inclined surface 23a of the engagement pin 20, and only the clutch dog 4 slides, and the clutch pawl 7 of the clutch dog 4 engages the output shaft. The clutch pawl 8 on the third side engages with the clutch pawl 8, and the clutch is completely fitted. In this clutch-fitting state, as shown in FIG. Hold in direction. At this time, as described above, in this clutch engaged state, the first engagement portion A, that is, the detent ball 11 on the input shaft 2 engages with the engagement groove 13 for maintaining the engagement position on the inner circumference of the clutch dog 4. ,
In addition, since the clutch dog 4 is biased to be pushed toward the mating clutch body by the action of the inclined surface 13a, the conical friction inner circumferential surface 17 of the friction cone body 16
is pressed against the conical friction outer peripheral surface 14 side of the output shaft 3 side, a frictional force is generated between the two, and this frictional force is
It acts as a resistance to the movement of the claw due to torque fluctuations, and can reduce such movement and the hammering noise.

In addition, in this embodiment, the engagement pin 20 is provided on the friction cone body 16 side, and the mating pin engagement grooves 23, 2
4, but this may be something like a ball, or an engagement pin 20 or a spring 22 may be attached to the clutch dog 4 side.
The pin engagement grooves 23 and 24 may be formed on the friction cone body 16 side. Further, the relationship between the detent ball 11 and the engagement grooves 13 and 12 of the input shaft 2 is the same, and the detent ball 11 may be provided on the clutch dog 4 side and the engagement grooves 13 and 12 may be provided on the input shaft 2 side. .

As described above, according to the present invention, when the clutch engages,
By providing the detachable second engaging body that holds the friction cone body in the axial direction with respect to the clutch dog, the friction cone body and the mating clutch body side are moved by the force acting on the first engaging part. Since frictional force is generated and acts as a resistance against the movement of the nail, it is possible to reduce the movement of the claw and the resulting hammering noise.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an example of a pawl clutch;
FIG. 2 is a cross-sectional view of the pawl engaging portion, FIG. 3 is an enlarged longitudinal sectional view of the main part in the neutral state, and FIG. 4 is an enlarged longitudinal sectional view of the main part in the clutch-fitted state. 2... Input shaft, 4... Clutch dog, 6... Output shaft large diameter end (clutch body), 7, 8... Clutch pawl, 10... Spring (elastic body), 11... Detent ball (engaging body) ), 12... engagement groove, 12a...
... Inclined surface, 14 ... Conical friction outer peripheral surface, 16 ... Friction cone body, 20 ... Engagement pin (engagement body), 22
...Spring (elastic body), A...First engaging part, B...
Second engagement part.

Claims (1)

[Scope of utility model registration request] One of the driving side and the driven side is provided with a clutch dog that is slidable relative to the transmission shaft, and the other side is provided with a clutch body that meshes with the clutch dog, and the sliding surface of the clutch dog and the transmission shaft is provided with a clutch body that meshes with the clutch dog. An engaging groove is formed on one of the surfaces, and the other surface is engaged with the engaging groove when the clutch is engaged by the urging force of an elastic body, and the urging force of the elastic body is applied through the inclined surface. a first engaging portion acting to move the clutch dog of the lever toward the mating clutch body, a conical friction surface on the clutch body side, and a clutch dog on the other side rotating integrally with the clutch dog; and a friction cone body for synchronous engagement that slides into sliding contact with the conical friction surface prior to engagement of the clutch dog with the clutch body is attached so as to be movable in the axial direction, when the clutch dog is engaged, the first engagement portion In order to press the friction cone body against the conical friction surface by the biasing force of the clutch dog and the friction cone body, an engagement groove is provided on one side of the clutch dog and the friction cone body, and the engagement groove is engaged with the engagement groove on the other side by the biasing force of the elastic body. 1. A pawl clutch characterized in that a second engaging member is provided which can be engaged and disengaged to axially restrain the friction cone body relative to a clutch dog.