JPH0729303Y2 - Rotating body for transmission - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a transmission rotary member used in a transmission such as a work vehicle, more specifically, a clutch portion forming a half portion of a cone clutch and the clutch portion. On the other hand, to the transmission rotating body integrally provided with the concentric gear part,
It is related.

[Prior Art] Although gears have been manufactured from synthetic resin for a long time, in recent years, glass, steel, inorganic fiber materials such as ceramics, organic fiber materials such as aromatic polyamide, graphite or aluminum, A friction material formed by molding a material obtained by adding a powdered material such as rubber and a friction base material to a thermosetting resin such as a phenol resin under pressure and heating is mainly provided as a vehicle brake member. (See, for example, JP-A-62-195027 and JP-A-63-248841).

[Problems to be solved by the invention]

Conventionally, there is no transmission rotating body in which the gears and the friction material parts are integrated as described above, but this requires that the gears have a low friction coefficient, while the friction material parts require a high friction coefficient. Then, it is judged that they have mutually opposite properties.

However, gears and friction material parts that rotate integrally with each other in the transmission are often used, and if these are integrally molded from a material containing a synthetic resin,
It is important to contribute to cost reduction and weight reduction of the transmission.

Therefore, the present invention focuses on the phenomenon such as the deposition of the resin layer on the outer surface, which occurs when the friction material is molded under pressure and heating as described above, and the phenomenon of the cone clutch for intermittent power transmission or shifting. Half clutch and spiral gear for rotation transmission,
An object of the present invention is to provide a novel transmission rotary body that integrally includes a bevel gear or a worm gear and rattle gears.

[Means for solving problems]

To this end, the present invention adds the following thermosetting resin to the rotating body for transmission, that is, the friction base material, as illustrated in FIGS. 1, 2, 6, 7, and 8, respectively. Formed by pressurizing and heating the material, and integrally provided with a clutch portion 2 having a conical clutch surface 2a and a gear portion 3 concentrically arranged with the clutch portion, and deposited on the outer surface during molding. The resin layer 4 is removed from the clutch surface 2a and left on the outer surface of the gear portion 3.

[Action]

As described above, when molding a material in which a thermosetting resin for bonding is added to the friction base material under pressure and heating, in general, based on the temperature difference between the surface and the inside of the molding die filled with the material,
Only the resin component such as phenol resin is deposited on the surface portion on the high temperature side, that is, on the outer surface of the molded product to form a resin layer having a thickness of several microns.

In this invention, the resin layer 4 is removed from the conical-shaped clutch surface 2a of the clutch portion 2 and left on the outer surface of the gear portion 3. The resin layer is removed from the clutch surface 2a by cutting or cutting. Although it can be mechanically polished, the following method is suitable for maintaining the accuracy of roundness and cylindricity of the molded product and for ensuring mass productivity.

That is, the outer surface of the gear portion 3 and other portions where the resin layer 4 is not desired to be removed is covered with a cylindrical cover or the like and the portion corresponding to the clutch surface 2a is exposed, and a suitable shot material (eg, alumina, silica, glass beads) is used. , Copper particles, cutting wire) is sprayed onto the corresponding area of the clutch surface 2a to knock off the resin layer, or shot peening, or sand particles are applied to the clutch surface 2a.
Sandblasting, in which the resin layer is blown off against the corresponding portion, is knocked off, or barrel molding is carried out in which the molded product is placed in a barrel containing a cut wire or iron powder and stirred to remove the resin layer. Alternatively, a chemical method may be used. For example, the outer surface of the gear portion 3 and other portions where the resin layer 4 is not desired to be removed is coated with an acid / alkali resistant epoxy resin, and the portion corresponding to the clutch surface 2a is exposed. It is possible to remove the resin layer consisting of the phenol resin by coating with a strong acid or strong alkaline solution or by immersing it in the solution, and then removing the epoxy resin coating with a suitable organic solvent.

In the transmission rotating body of this invention, FIGS.
As illustrated in FIGS. 7 and 8, the friction base material (shown by black dots) is exposed on the conical-shaped clutch surface 2a of the clutch portion 2 and the resin layer 4 on the gear portion 3.
It is covered by. The clutch surface 2a where the friction base material is exposed has a high friction coefficient, and the resin layer 4 on the outer surface of the gear portion 3 has a high hardness and a low friction coefficient.

Therefore, in the transmission of a work vehicle or the like, the rotary body of the present invention is constructed by combining a clutch member having one half of the clutch portion 2 and a cone member having a conical clutch surface corresponding to the clutch surface 2a and inputting the cone clutch. Alternatively, when using the gear unit 3 as the output rotating body,
The clutch part 2 as the clutch half part and the gear part 3 as the gear respectively function as required.

[Effect of device]

As described above, the present invention provides a rotating body integrally provided with the clutch half and the clutch 2 and the gear 3 which function as required as the clutch half of the cone clutch and the transmission gear, respectively, and the inorganic or organic fiber material or powder material. It is made from a cheap and lightweight material that combines a friction base material and a thermosetting resin for bonding such as a phenol resin, and the process of incorporating the clutch half part and the gear separately is summarized as one. Therefore, it greatly contributes to cost reduction and weight reduction of transmissions such as work vehicles.

〔Example〕

The transmission rotary body 1 according to the first embodiment, which is cut along a plane including a center line in FIG. 2 and shows a half portion, is used in a transaxle as shown in FIGS. 1 and 3-5. ing.

This transaxle is provided with a mesh case 7 arranged between the left and right drive wheels (not shown) of the walk-behind lawn mower. The mesh case 7 is divided into two parts as shown in FIGS. The upper and lower case halves are connected by bolts 8 shown in FIG. Mission case 7
Is equipped with a vertical input shaft 9 protruding upward, and an input pulley 10 for receiving belt transmission from an engine output pulley (not shown) is attached to the upper end of the input shaft 9. The mission case 7 is also equipped with a horizontal axle 11 extending left and right, and the axle 11 is supported by the mating surfaces of the upper and lower case halves via a pair of left and right bearing sleeves in a hug manner. There is.

A worm 13 is fixedly installed on the input shaft 9 in the mesh case 7, and the rotating body 1 is loosely fitted and installed on the axle 11. In the first embodiment, the gear portion 3 of the rotating body 1 is formed as a beveled worm gear that meshes with the worm 13. Further, the clutch portion 2 is formed into a cone of a cone clutch, and a cone cave 14 having a cone-shaped clutch surface 14a corresponding to the clutch surface 2a on the inner surface side is slidable by using a slide key 15 only on the axle. It is provided on 11. The illustrated cone clutch constructed by combining the clutch portion 2 of the rotating body 1 and the cone cave 14 is a clutch spring for urging and moving the cone cave 14 between the rotating body 1 and the cone cave 14 on the axle 11 in the opposite direction of the rotating body 1. It is a dead-man type that is always kept in a cut state by providing 16.

In the first embodiment, as shown in FIGS. 1 and 2, of the molded outer surface of the rotating body 1, the resin layer is removed only from the clutch surface 2a, and the resin layer 4 is left in the other portions. . Although various methods as described above are used to remove the resin layer,
Among them, when the shot peening method or the sand blast method is used, fine unevenness is formed on the clutch surface 2a by spraying a shot material or a sand granule, and the clutch surface 2a
The contact area of the cone cave 14 with the clutch surface 14a is reduced by that much, and conversely the surface pressure at the time of engagement is increased. Therefore, in order to reliably prevent the clutch engagement in the misaligned state due to the axial misalignment between the clutch portion 2 and the cone cave 14, the contact lengths of the two clutch surfaces 2a, 14a in the clutch axial direction are increased. Even if the dimensions are set, it is possible to provide the actual benefit of suppressing the reduction of the surface pressure at the time of engagement due to the increase of the contact area.

In order to obtain the clutch engagement of the cone clutch, the rotating body 1
From the reaction side of the sheet metal clutch fork 17 which engages with the corn cave 14, the upper and lower supports 1 having circular outer surfaces are provided.
It is rotatably supported by the top wall and the bottom wall of the case 7 via 8,19. A clutch arm 20 is attached to the clutch fork 17 outside the upper surface of the mission case 7. The clutch arm 20 is connected to a clutch lever attached to a lawn mower control handle (not shown), and when the clutch lever is gripped, it is pivotally displaced in the cone clutch engaging direction.

In the illustrated transaxle, the transmission rotary body 1 on the axle 1 is decelerated by an input shaft 9 via a worm 13 and a gear portion 3 which is a worm gear. Clutch surface 2a
In contrast, when the clutch surface 14a is engaged and the cone clutch is inserted, the rotation of the rotating body 1 is transmitted to the axle 11.
The cone clutch is cut when the walking lawn mower is pushed and pulled by a steering handle portion (not shown) to move forward or backward by human power, or when the steering handle is operated to turn.

FIG. 6 shows a transmission rotary member 1A of the second embodiment which is used similarly to that of the first embodiment, but in which the shape of the clutch surface 2a is modified.

In the second embodiment, the conical surface-shaped clutch surface 2a of the clutch portion 2 is used.
When a plurality of oil grooves 22 are formed by intermittently arranging in the circumferential direction, and the rotary body 1A is combined with the cone cave 14 as shown in FIG. 1 to form a cone clutch, the oil grooves 22 form a cone. The lubricating oil easily passes between the clutch portion 2 and the cone cave, and the clutch cooling effect is enhanced. Then, each oil groove 22 is flared from the small diameter portion to the large diameter portion of the clutch portion 2, that is, the groove width α on the small diameter portion side.
It is formed so that the groove width β on the larger diameter portion side is larger than that on the smaller diameter portion to reduce the contact area of the clutch surface 2a with the cone cave / clutch surface in the large diameter portion having a larger peripheral speed than the small diameter portion. The surface pressure at the time of engagement with the cone cave / clutch surface on the large diameter side is increased to prevent slipping between the clutch surfaces.

FIG. 7 shows the transmission rotary body of the third embodiment in which the clutch portion 2 is formed in the cone cave, contrary to the first and second embodiments.
1B is shown. Further, in the third embodiment, the gear portion 3 of the rotating body 1B is formed as a bevel gear.

That is, the rotor 1B is loosely installed on the axle 11 in the transmission case 7 as in the case of FIG. 1, but in the transaxle shown in FIG. 7, the input shaft 9 corresponding to the input shaft 9 is used. Is a short length, and a bevel pinion 24 is integrally provided at the lower end, and a gear portion 3 is formed to form a bevel gear that meshes with the bevel pinion 24. Also cone 25 on axle 11
Is provided so as to be slidable only by a slide key 15, and the clutch portion 2 of the rotating body 1B is provided with a cone surface 2a inside which the cone-shaped clutch surface 25a on the outer surface of the cone 25 is engaged. Is formed.

Further, in the third embodiment, in order to easily cover or mask the non-removed portion when removing the resin layer, not only the clutch surface 2a but also the flat surface portion 2b connected to the small diameter end of the clutch surface 2a It is said that the resin layer was removed from 2a at the same time. A clutch spring 16 similar to that described above is provided, and a clutch fork 17 for displacing and operating the cone 25 is mounted on a horizontal rotary operation shaft 26 and engaged with the cone 25 via a ring 27.

FIG. 8 shows two transmission rotating bodies 1C and 1D according to the fourth embodiment which are used for gear shifting.

Both rotating bodies 1C and 1D, which are shown only in half, are loosely fitted and installed on the spline cylinder 30 fitted to the axle 1 and fixed with the pin 29, with the spline cylinder 30 being interposed between both rotating bodies 1C and 1D. A cone 31 having a pair of conical-shaped clutch surfaces 31a and 31b on both sides is slidably spline-fitted therein. The clutch portion 2 of each of the rotating bodies 1C and 1D is formed in a cylindrical shape protruding toward the cone 31, and the end surface thereof is formed as the clutch surface 2a. Further, the gear portion 3 of each rotary body 3 is formed as a spool gear, and the diameters of the gear portions 3 of both rotary bodies 1C and 1D are made different from each other.
The individual drive gears 32C and 32D are meshed with each other and placed on the spline cylinder 30 to rotate the rotating body 1C at a low speed and rotate the rotating body 1D at a higher speed.

The cone 31 is supposed to be slidably displaced by the shift fork 33 engaged with it. When the clutch surface 31a is engaged with the clutch surface 2a of the rotating body 1C and the rotating body 1C is connected to the spline cylinder 30, The speed of rotation is the same as the clutch surface.
It is said that when 31b is engaged with the clutch surface 2a of the rotating body 1D and the rotating body 1D is coupled to the spline cylinder 30, the second speed of rotation is obtained in each axle 1. Between the cone 31 and each of the rotating bodies 1C, 1D, springs 34C, 34D are provided, which when the cone clutches are engaged, move and energize the cone 31 in the clutch cutting direction. The operation is facilitated. The resin layer is removed from the outer surface of each of the rotating bodies 1C and 1D on the clutch surface 2a and the cylindrical surface portion 2c and the flat surface portion 2d following the small diameter end.

[Brief description of drawings]

1 is a cross-sectional plan view of a transaxle equipped with the first embodiment, FIG. 2 is a perspective view showing a half portion of the first embodiment,
FIG. 3 is a plan view of the transaxle, FIGS. 4 and 5 are vertical side views of the transaxle taken along different vertical sections, and FIG. 6 is a perspective view of the second embodiment. FIG. 7 is a vertical sectional front view of a transaxle equipped with the third embodiment, and FIG. 8 is a cross-sectional plan view of a part of the transaxle equipped with the fourth embodiment. 1,1A, 1B, 1C, 1D …… Rotating body for transmission, 2 …… Clutch section, 2
a ... Clutch surface, 3 ... Gear part, 4 ... Resin layer, 9
...... Input shaft, 11 …… Axle, 13 …… Worm, 14 …… Cone cave, 24 …… Bevel pinion, 25 …… Cone, 30…
… Spline tube, 31… Cone, 32C, 32D… Drive gear.

Claims (1)

[Scope of utility model registration request] 1. A clutch part 2 having a conical-shaped clutch surface 2a, which is formed by molding a friction base material to which a thermosetting resin for feeding is added under pressure and heating, and concentric arrangement with the clutch part. 1. The transmission rotary body which is integrally provided with the gear part 3 and which is removed from the clutch surface 2a and left on the outer surface of the gear part 3 by removing the resin layer 4 deposited on the outer surface during molding.