JPH0144859Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a gear transmission structure, and in particular, to improving durability in a structure for preventing chattering between a clutch hub and a clutch sleeve spline-fitted thereto. , relates to a gear transmission structure with good manufacturability that can prevent deterioration of shift feeling.

[Technical background of the invention and its problems]

Generally, in a gear transmission, as shown in FIG. 5, a clutch sleeve 1 is spline-fitted to a clutch hub 2, so that power input from the clutch hub 2 is transmitted to a speed change gear (not shown).

Incidentally, the spline fitting portion 3 between the clutch hub 2 and the clutch sleeve 1 inevitably has "backlash" due to manufacturing process.
This play does not have a negative effect when the clutch sleeve 1 is transmitting power to the transmission gear, but when the clutch sleeve 1 idles due to the connection with the transmission gear being severed due to a shift operation, it causes chattering (collision between spline teeth). ) causes noise.

Therefore, in the conventional Japanese Utility Model Application Publication No. 52-71639,
A ball (spherical body) is interposed between the clutch hub and the clutch sleeve so that they are in pressure contact with each other, and this ball urges the clutch sleeve in one direction in the circumferential direction relative to the clutch hub, so that the spline teeth are always in contact with each other. A structure has been proposed that eliminates backlash and prevents noise by maintaining the

However, conventional methods have had the following problems.

Since the member that presses against the clutch sleeve to prevent rattling is a ball, the contact state is a point contact, and the contact surface pressure is extremely high, causing significant fatigue and wear on the contact surface of the clutch sleeve. It is thought that this will promote

Further, the clutch sleeve is spline-fitted to the clutch hub, and when a shift operation is performed, the clutch sleeve is moved in the axial direction of the clutch hub to perform a speed change operation. However, the wear of the contact surface of the clutch sleeve by the ball (as described above) results in a concave spherical shape that follows the contour of the ball, and the ball engages with the worn part, preventing the clutch sleeve from moving in the axial direction and deteriorating the shift feeling. is possible.

Furthermore, in order to minimize the above-mentioned problems, it is necessary to process the contact surface of the clutch sleeve to which the ball is pressed to have extremely high surface roughness and flatness, which increases manufacturing costs.

[Purpose of invention]

The present invention was devised in view of the above-mentioned problems, and its purpose is to improve durability and improve shift performance in a structure that prevents chattering between the clutch hub and the clutch sleeve that is spline-fitted to the clutch hub. To provide a gear transmission structure with good manufacturability that can prevent deterioration of feeling.

[Summary of the idea]

According to the present invention, the above object is achieved by the following configuration.

That is, a clutch hub, a clutch sleeve spline-fitted to the clutch hub and provided so as to be rotationally driven and movable along the axial direction; It comprises a key member disposed between the splines to press the spline teeth toward opposite sides in the circumferential direction so as to bring the spline teeth into contact with the clutch sleeve, and a pressing member that applies a biasing force to the key member. be.

[Example of idea]

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

2 is a sectional view taken along the - line in FIG. 5, and FIG. 1 is a sectional view taken along the - line in FIG. 2.

2 is a clutch hub, and this clutch hub 2
A clutch sleeve 1 is spline fitted to the clutch sleeve 1. And clutch sleeve 1 and clutch hub 2
and are engaged with each other in the circumferential direction by respective spline teeth 4 and 5, and the power of the clutch hub 2 is transmitted to the clutch sleeve 1 via the tooth surfaces to rotationally drive the clutch sleeve 1. Also clutch sleeve 1
is provided so that its spline teeth 4 are guided by spline teeth 5 of the clutch hub 2 and are movable in the axial direction of the clutch hub 2.

A key member 6, which is a feature of the present invention, is disposed between the splines of the clutch hub 2 and the clutch sleeve 1 thus constructed. More specifically, an oval-shaped concave portion 7 is formed on the circumferential side of the clutch hub 2, and is open toward the clutch sleeve 1 and is elongated along the axial direction. In particular, a wall 8 facing in the direction opposite to the direction of rotation of the clutch hub 2 to form this recess 7 is opposed to a wall 9 formed in the clutch sleeve 1 facing in the direction of rotation thereof. It is formed like this.

In this embodiment, as shown in FIG. 2, since the concave portion 7 is formed at the base of the spline tooth 5, the concave portion 7 extends toward the tooth tip side (clutch sleeve 1 side) in the wall portion 8 of the clutch hub 2. On the other hand, the wall portion 9 of the clutch sleeve 1 is formed by tooth surfaces facing the rotational direction of the spline teeth 4, and are arranged to face each other along the circumferential (rotation) direction.

A key member 6 is provided between the splines having such wall portions 8 and 9. As shown in FIGS. 1 and 2, this key member 6 is formed into a shaft shape with a circular cross section, and both ends in the axial direction are formed into smooth spherical shapes.

The key member 6 is pressed against the walls 9 and 8 of the clutch sleeve 1 and the clutch hub 2 in a substantially linear contact state along the axial direction, and presses the walls 9 and 8 in opposite directions in the circumferential direction to generate power. Tooth surface 5 of spline tooth 5 facing the rotation direction of clutch hub 2 to be transmitted
a and the tooth surface 4a of the spline tooth 4 of the clutch sleeve 1 facing the opposite side to the rotational direction and receiving the transmitted power. A hole 10 is formed in the clutch hub 2 at approximately the center of the concave portion 7, and a biasing means 11 such as a coil spring is provided in the hole 10. This biasing means 11 serves as a pressing member that functions to bias and support the key member 6 from the clutch hub 2 side to the clutch sleeve 1 side and to ensure pressure contact between the key member 6 and the walls 8 and 9. .

By the way, in the present invention, the key member 6 is formed in the shape of a shaft with a circular cross section, and the clutch sleeve 1
Since the contact with the wall portion 9 is made into a line contact state, the contact surface pressure can be reduced compared to the conventional point contact. Therefore, fatigue of the contact surface of the clutch sleeve 1 can be reduced, wear can be suppressed, and durability can be improved.

In addition, wear is suppressed, and even if there is some wear, the wear becomes a cylindrical surface that follows the contour of the shaft-shaped key member 6 along the axial direction of the clutch hub 2, so that the axial movement of the clutch sleeve 1 during a shift operation is prevented. Good shift feeling can be ensured without interfering with the shift.

In addition, since the key member 6 is brought into line contact with the wall 9 of the clutch sleeve 1, processing accuracy such as surface roughness and flatness of the contact surface (wall) of the clutch sleeve 1 can be relaxed, and manufacturing costs can be reduced. can be reduced.

Furthermore, it goes without saying that the key member 6 employed in the present invention can eliminate "backlash" in spline fitting and achieve noise prevention.

[Modification example]

A modified embodiment is shown in FIGS. 3 and 4. This is clutch hub 2 and clutch sleeve 1
This is a case where the wall portions 8 and 9 provided at the tooth bottom 5b and the tooth tip 4b are respectively formed, and the other configurations are the same as those of the above embodiment.

Further, the number of key members installed, the biasing force of the biasing means, etc. can be variously considered as design matters in order to obtain a good shift feeling.

Furthermore, various types of biasing means, such as a coiled spring and a corrugated plate spring, can be employed.

[Effect of idea]

In summary, the present invention exhibits the following excellent effects.

(1) Since the key member for preventing noise generation is formed into a shaft shape with a circular cross section, the contact pressure with the clutch sleeve is reduced, wear is suppressed, and durability is improved.

(2) Wear is suppressed, and even if there is some wear, the wear becomes a cylindrical surface along the axial direction of the clutch hub, so a good shift feeling can be ensured without hindering the movement of the clutch sleeve during a shift operation.

(3) Since the key member is brought into line contact with the clutch sleeve, the machining accuracy of the clutch sleeve can be relaxed and manufacturing costs can be reduced.

(4) The key member eliminates "backlash" in spline fitting and prevents noise caused by chattering.

[Brief explanation of the drawing]

1 is a cross-sectional view taken along the - line in FIG. 2 showing a preferred embodiment of the present invention, FIG. 2 is a sectional view taken along the - arrow in FIG.
FIG. 4 is a view taken along the - line in FIG. 5, and FIG. 5 is an enlarged partially cutaway side view of the essential parts of the gear transmission. In the figure, 1 is a clutch sleeve, 2 is a clutch hub, and 6 is a key member.

Claims (1)

[Scope of utility model registration request] a clutch hub; a clutch sleeve spline-fitted to the hub so as to be movable along the axial direction while being rotatably driven; A key member disposed between the splines to press the spline teeth toward opposite sides in the circumferential direction to bring the spline teeth into contact with the sleeve, and a pressing member applying a biasing force to the key member. gear transmission structure.