JP2002257171A - Manufacturing method of damper ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a manufacturing method of a damper ring capable of precisely maintaining core material in a designated position of the ring in a mold. SOLUTION: The core material such as a coil spring and the like is buried in a ring main body made from an elastic body. In the manufacturing method of a damper ring making the core material exposed through clearance among respective divided ring bodies in which the ring main body is divided along a longitudinal direction of the ring, a plurality of forming portions 79 of the divided ring bodies and core material retaining portion 80 fitting and retaining the core material 66 positioned among the forming portions 79 of the divided ring bodies are arranged in the mold 77 for manufacturing the damper ring, and the core material 66 is retained by the core material retaining portion 80. Then, by vulcanizing the material of the elastic body in the inside of the forming portions 79 of the respective divided ring bodies, the vulcanized material is covered on the periphery of the core material 66. The core material can be precisely retained in a designated ring position in a middle position of the longitudinal ring direction. A linear-shaped mold is advantageous to multiple molding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a damper ring, and more particularly to a high-low (Hi-L) system for a four-wheel drive vehicle.
o) A method of manufacturing a damper ring used for floatingly supporting a ring gear in a case where a subtransmission having a planetary gear mechanism is provided to enable switching.

[0002]

2. Description of the Related Art In a transfer (power distribution device) of a four-wheel drive vehicle, it is known to provide an auxiliary transmission composed of a planetary gear mechanism in order to enable high-low (Hi-Lo) switching (Japanese Patent Application Laid-Open (JP-A) no. No. 3003330). in this case,
Due to the structure of the planetary gear mechanism, if the shaft positions are fixed for all gears, the load cannot be shared uniformly. Therefore, it is necessary to make the shaft position free for any of the gears.

[0003]

Here, in consideration of a floating structure in which a ring gear having the largest diameter is made free, a ring gear is loosely fitted to a casing to allow eccentric movement, that is, rattling in a radial direction. become. Then, when the ring gear moves eccentrically, it collides directly with the casing,
It causes vibration noise. Therefore, a damper ring is inserted into the gap between the fitting portions to buffer or prevent direct collision with each other.

Conventionally, the damper ring is an O-ring having a relatively large diameter. When assembling the ring gear to the casing, first, the O-ring is fitted into the fitting hole on the casing side, and the O-ring is set along the radially outer fitting surface by the elastic return force of the O-ring itself. And then carefully press-fit the ring gear into the O-ring.

However, large-diameter O-rings have large variations in diameter and length, and the rigidity of the ring itself is low, so that it is difficult to maintain its own shape. For this reason, the followability of the O-ring to the mating surface is poor, and when the ring gear is press-fitted, the O-ring is bent inward in the radial direction, bites in, or the O-ring is broken at the worst. .

For this reason, it is conceivable to embed a core material in the ring to prevent variations in the diameter and length of the ring and increase the rigidity of the ring.

However, the desired damping characteristics cannot be exhibited unless the core material is accurately placed at a predetermined position in the ring, mainly at the center. As a manufacturing method of the ring, rubber is applied to the core material in the mold, but if the core material is temporarily put around the ring, there is no place to hold the core material, and a desired damper ring cannot be manufactured. Will be.

Accordingly, the present invention has been made in view of the above problems, and an object of the present invention is to provide a method of manufacturing a damper ring capable of accurately holding a core material at a predetermined position of a ring in a mold.

[0009]

SUMMARY OF THE INVENTION The present invention relates to a damper ring in which a core member such as a coil spring is embedded in a ring body made of an elastic body. Ring members are arranged at predetermined intervals in the longitudinal direction of the ring, and the split ring members are connected to each other by the core member, and the core member is exposed from a gap between the split ring members. A method for producing a damper ring, comprising: a mold for producing a damper ring; a plurality of divided ring body forming portions divided in a longitudinal direction and separated by a predetermined distance; and the core positioned between the divided ring body forming portions. A core material holding portion in which the material is fitted and held, and in the mold, after holding the core material by the core material holding portion, vulcanize an elastic material in each split ring body forming portion. , The above wick Of the material around is to form each of the divided ring body are adhered.

According to this, the core material can be held by the core material holding portion between the split ring body forming portions, that is, the core material can be held at an intermediate position in the longitudinal direction of the ring, and a desired damper ring can be manufactured. can do.

Here, it is preferable that the mold has a linear shape as a whole, and that the split ring body forming portion and the core material holding portion are alternately arranged on a straight line in the mold.

[0012]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

First, a four-wheel drive vehicle and a transfer to which the damper according to the present invention is applied will be described. As shown in FIG. 19, in a four-wheel drive vehicle, the engine E
Transmission T / M, transfer T
/ F, and is distributed to the front and rear sides by the transfer T / F, and then transmitted to the front wheels FW and the rear wheels RW to drive the four wheels. As will become clear later, the drive of the front wheels FW is optional, and a so-called FR-based part-time 4WD configuration is employed. The transmission T / M is of a manual type including a friction clutch or an automatic transmission type including a fluid converter.

FIG. 14 shows a transfer. The transfer T / F inputs the power of the transmission T / M from the input shaft 1,
Power is output from the rear output shaft 2 to the rear wheels, and power is selectively output from the front output shaft 3 to the front wheels. The rear output shaft 2 and the front output shaft 3 are connected by a distribution device 4 composed of a chain and sprocket mechanism, and power is distributed and transmitted to each shaft. The power distribution to the front output shaft 3 is selectively performed by the selection device 5. This is the same configuration as the transmission mechanism in a normal manual transmission.

In order to perform Hi-Lo two-stage switching of the entire transfer, an auxiliary transmission 6 comprising a planetary gear mechanism is provided. The sub-transmission 6 has a reduction ratio of 1 or a direct connection when Hi, and has a reduction ratio larger than 1 (for example, 2.5) when Lo. The sub-transmission 6 reduces the rotation of the input shaft 1 and transmits it to the output side. The auxiliary transmission 6 also has a neutral (N) position. The entirety of the input shaft 1 to the sub-transmission 6 is housed in a common transfer casing 7.

In the vicinity of the front end of the transfer T / F,
The input shaft 1 and the rear output shaft 2 are fitted and connected coaxially and are relatively rotatable relative to each other. A needle bearing 8 is provided at the connection portion. The input shaft 1 is hollow, the front end of which protrudes from the casing 7, and a spline 9 is formed on the inner periphery so that a transmission output shaft (not shown) can be spline-fitted. . The input shaft 1 is also supported from the outer peripheral side by a front bearing 11 composed of a ball bearing via a needle bearing 10 and a carrier bearing 30a. As a result, the input shaft 1 is supported from the inner and outer peripheral sides by the needle bearing 8 and the front bearing 11. A gap between the input shaft 1 and the casing 7 is sealed by an oil seal 12.

The rear output shaft 2 extends substantially over the entire length of the transfer, and is supported at its rear end by a rear bearing 13 composed of a ball bearing. The rear end protrudes from the casing 7 (not shown) so that a rear wheel drive shaft (propeller shaft) S / R can be connected as shown in FIG.

The distribution device 4 is provided at a substantially intermediate position of the rear output shaft 2 and is relatively rotatably mounted on the outer peripheral side of the rear output shaft 2.
It comprises a driven sprocket (driven member) 15 fixed to the front output shaft 3 and a chain 16 connecting these sprockets. The front output shaft 3 has a ball bearing 17 on the front side and a needle bearing 1 on the rear end.
The front end is protruded from the casing 7.
A flange 19 is fastened to the protruding portion by a nut 21, and the front wheel drive shaft S is
/ F can be connected. The gap between the protrusion and the casing 7 is sealed by the oil seal 22.

Here, as shown in FIG. 17, the transfer T / F is inclined not obliquely but vertically in a front view. The front output shaft 3 is disposed diagonally below the input shaft 1 and the rear output shaft 2, and their positions are offset in the left-right direction. This prevents interference between the engine E or the transmission T / M and the front wheel drive shaft S / F as shown in FIG.

The selection device 5 is provided in front of and adjacent to the driving sprocket 14. The selection device 5 includes a dog gear 23 provided on the drive sprocket 14, a clutch hub 24 fixedly provided on the rear output shaft 2, and a selection sleeve 25 spline-fitted to the outer peripheral portion of the clutch hub 24 so as to be axially slidable. And a synchronizer ring 26 provided between the dog gear 23 and the clutch hub 24. The illustrated state is a two-wheel drive (neutral) state. When the selection sleeve 25 is slid backward from this state, the selection sleeve 25 is synchronized by the synchronizer ring 26,
Meshes with the dog gear 23. As a result, the clutch hub 24 and the dog gear 23, and furthermore, the rear output shaft 2 and the driving sprocket 14 are connected, and the rotational power of the rear output shaft 2 is distributed and transmitted to the front output shaft 3 to be in a four-wheel drive state.

The auxiliary transmission 6 is provided in front of the selection device 5 and near the connection between the input shaft 1 and the rear output shaft 2. The auxiliary transmission 6 is of a planetary gear type, and includes a sun gear 27 provided integrally with the input shaft 1, a plurality of planetary gears 28 meshed with an outer peripheral portion of the sun gear 27, and each planetary gear 28.
And a ring gear 31 having an inner peripheral gear meshed with each planetary gear 28. The carrier 30 is provided with a bridge 32 at a circumferential position where there is no planetary gear 28, and also goes around the sun gear 27 and the planetary gear 28 to support the shaft 29 at both ends. The above-described carrier bearing portion 30 a is a part of the carrier 30, projects forward from the carrier 30, and is supported between the needle bearing 10 and the front bearing 11. A needle bearing 33 for thrust is provided to reduce a thrust load between the sun gear 27 and the carrier 30. Ring gear 31
Is spline-fitted and fixed to the casing 7 as will be described in detail later.

A hollow portion is provided radially inside the sun gear 27 and the carrier 30, and a switching sleeve 34 is provided slidably on the rear output shaft 2 there. Rear output shaft 2
Is provided with a spline 35, and a sleeve 34 is spline-fitted to the spline 35 to allow the sleeve 34 to slide in the axial direction, thereby preventing rotation on the rear output shaft 2.

Splines 36, 37,... Are provided on the inner peripheral portion of the sun gear 27 and the carrier 30 and the outer peripheral portion of the switching sleeve 34.
38 are provided. Slide the switching sleeve 34,
Hi-Lo switching is performed by selectively meshing the spline 38 with one of the splines 36 and 37 of the sun gear and the carrier. A neutral (N) position for disengaging the spline 38 of the switching sleeve 34 (free) is provided between the splines 36 and 37 of the sun gear and the carrier. The auxiliary transmission or the switching mechanism is not provided with a synchro.

As shown, when the switching sleeve 34 is engaged with the sun gear 27, the input shaft 1 and the rear output shaft 2 are substantially directly connected to each other, and the rotational power of the input shaft 1 is transmitted to the rear output shaft 2 as it is. . This is the Hi position. At this time, the planetary gear 28 rotates following the sun gear 27.

On the other hand, the switching sleeve 34 is slid backward from the state shown in the figure,
, The rotational power of the input shaft 1 is changed to the sun gear 27 →
Planetary gear 28 → carrier 30 → switching sleeve 34
→ The rear output shaft 2 is transmitted, and the rear output shaft 2 is rotated at a reduced speed with respect to the input shaft 1. This is Lo position.

In this transfer, switching between two-wheel drive and four-wheel drive by the selection device 5 and switching between Hi-N-Lo by the auxiliary transmission 6 are automatically performed by a common actuator 39. The actuator 39 has a motor 40 whose phase is controlled, and is stepwise rotated to a plurality of phase positions by the motor 40, and the selecting device 5 and the auxiliary transmission 6 are rotated.
A cylindrical cam 43 having two cam grooves 41 and 42 for switching the cam groove 41 and a selection arm 44 which engages with the cam groove 41 and the selection sleeve 25 to move the selection sleeve 25 in accordance with the rotation of the cam groove 41; , Cam groove 42 and switching sleeve 3
4 and the switching sleeve 3 according to the rotation of the cam groove 42.
Switching arm 45 for moving each arm 4 and each arm 4
And two shafts (only one shaft 46 is shown) for supporting the shafts 4 and 45 movably in the axial direction. Each of the arms 44 and 45 is provided with a shock absorber 48 using a spring (only one spring 47 is shown) so as not to apply an overload when the splines are engaged. A check mechanism 48a is provided for each shaft for positioning.

Lubricating oil is stored in the casing 7, but since the transfer is inclined as shown in FIG. 17, the oil is stored on the lower front output shaft 3 side, and is difficult to reach the upper part. Therefore, the upper parts are forcibly lubricated by the oil pump 49.

The oil pump 49 is provided adjacent to the rear of the distributor 4 and is a trochoid pump driven by the rear output shaft 2. The oil pump 49 sucks the oil stored in the bottom of the casing by the suction pipe 50 and discharges the oil to the oil hole 51 formed in the center of the rear output shaft 2 as seen from the arrow. The oil in the oil holes 51 is supplied to the support portion of the drive sprocket 14, the selection device 5, and the auxiliary transmission 6 through each oil supply hole 52. Oil hole 51
Is opened, and the needle bearing 8 is supplied with oil from the front end. A cap 53 is attached to the input shaft 1 near the front end of the rear output shaft 2 to prevent oil from leaking outside.

A meter gear 54 is attached to the rear output shaft 2 adjacent to the rear side of the rear bearing 13, and the rotation of the meter gear 54 is detected by a rotation sensor (not shown) via the worm gear 55, and the vehicle speed is detected.

The sub-transmission 6 has a so-called floating structure in which a radial gap h is provided between the ring gear 31 and the casing 7 as shown in FIG. 18, and the ring gear 31 can move slightly eccentrically. Has been adopted. Further, a damper ring is provided to buffer a direct collision between the ring gear 31 and the casing 7. Hereinafter, the mounting portion of the ring gear 31 will be described in detail.

As shown in FIG. 14, the ring gear 31
It is inserted from behind into a ring gear fitting hole 56 provided in the casing 7, and the axial position is fixed by a snap ring 57. A damper ring 58 is provided at the front end of the ring gear fitting hole 56.
Is inserted in advance, and thereafter, the ring gear 31 is inserted, the front end of the ring gear 31 is pressed into the damper ring 58, and the damper ring 58 is inserted between the ring gear 31 and the ring gear fitting hole 56.

As shown in FIG. 15, the ring gear fitting hole 5
6, a round surface 6 for adapting the damper ring 58 to a corner portion on the front rear side formed by a fitting surface 59 (large-diameter side fitting surface), which is an inner peripheral surface thereof, and a front end stopper surface 60.
1 is formed, and the damper ring 58 is mounted thereon.
The fitting surface 59 is formed with a tooth 62a of the spline 62 projecting from the front end stopper surface 60 at a position away from the front end stopper surface 60 by a predetermined distance.

As shown in FIG. 16, the ring gear 31
The front end face is inserted until it hits the front end stopper face 60. At the same time, the spline 6 of the ring gear 31
3 meshes with the spline 62 on the casing 7 side. The spline 63 of the ring gear 31 is formed longer than the spline 62 on the casing 7 side, protrudes forward from the spline 62 when the ring gear 31 is mounted, and comes into light contact with the damper ring 58. The press-fitting portion 64 into the damper ring 58 at the forefront end of the ring gear is, of course, a flat circumferential surface without the spline 63. Press-fitting portion 64 is smaller in diameter than the mating face 59 to form a radial gap h ₁ for causing charged damper ring 58 between the fitting surface 59.

When the ring gear 31 is inserted, the press-fit portion 6
4 is press-fitted into the damper ring 58, is charged in a state where the damper ring 58 in the gap h ₁ was crushed slightly between fitting surface 59 and the press-in portion 64. At this time, the ring gear 31 is centered coaxially with the input shaft 1 and the like, and at the same time, the splines 62, 63
A radially uniform gap h in the circumferential direction is secured therebetween. The floating support of the ring gear 31 is achieved by the gap h, and the ring gear 31 can be eccentrically moved by the gap h during power transmission.

Here, the damper ring 58 needs to be along the fitting surface 59 until the ring gear is completely mounted so that the damper ring 58 does not bend inward or bite when the ring gear is mounted. In order to secure such ring rigidity, the damper ring 58 of the present embodiment has the following structure.

As shown in FIGS. 1 to 3, the damper ring 58 includes a ring main body 65 made of an elastic body, in this embodiment, rubber, and a ring main body 6 made of metal or plastic.
And a core material 66 embedded at the center of the core material 5.
6 presses the ring main body 65 against the fitting surface 59. The ring main body 65 and the core member 66 are flexible bodies and can be relatively freely bent. The ring main body 65 is divided in the longitudinal direction or circumferential direction of the ring, and includes a plurality of divided ring bodies 67. The split ring bodies 67 are arranged at predetermined intervals in the ring longitudinal direction, and the split ring bodies 67 are connected to each other by the core 66, and the core 66 is exposed from the gap between the split ring bodies 67. .

The core 66 is a coil spring made of spring steel in this embodiment. However, it may be made of a single spring steel or a metal or plastic wire.

As described above, since the damper ring is formed by embedding the core material in the ring main body, variation in the diameter and length of the damper ring is prevented, and the rigidity is increased and the shape holding force is improved. Therefore, the followability of the damper ring to the large-diameter side fitting surface is improved. Specifically, the damper ring 58 is securely pressed against the fitting surface 59 until the ring gear is completely mounted.
And you will be able to follow along. Therefore, when the ring gear is mounted, the damper ring does not bend inward (see the phantom line in FIG. 1) or bite, and it is possible to prevent the damper ring from being cut.

Even with this configuration, the damper ring 58
Since the damper ring 58 itself is bendable, the damper ring 58 can be appropriately bent, and can be inserted into the ring gear fitting hole 56 while avoiding the teeth of the spline 62.

Further, since the ring main body 65 is divided, the whole ring is easily bent, and the followability to the casing fitting surface is improved. More specifically, since the core 66 exposed from the gap between the divided ring bodies 67 is more easily bent than a portion where the divided ring body 67 is located, a circular shape can be easily obtained.

In this embodiment, the split ring body 67 is formed in a sausage shape having a predetermined length, and both end surfaces in the longitudinal direction are spherical. However, the shape of the split ring body 67 is not limited to this.
As shown in FIG.
The ring body 65 or the split ring body 67 is press-fitted and crushed. In such a damper ring 58, the ring gear holding function of the conventional O-ring is provided by the ring body 6.
5 and the elastic function toward the radially expanding direction is assigned to the core 66.

In this embodiment, the core 66 is divided and connected to each other. More specifically, two equal ring units 6 each of which has a damper ring 58 that covers each half of the ring.
8 are connected at both ends. Since the core material 66 having a predetermined length is exposed at both ends of each ring unit 68, the exposed ends of the core material 66 are connected to each other to form one damper ring 58. The connection is shown at 69.

The structure of the connecting portion of the core member 66 is as shown in FIGS. In the structure of FIG. 5, the winding of the coil spring is made dense (that is, the winding pitch is small) at one end 66a of the core material, and the winding is made dense while the diameter of the coil spring is enlarged at the end 66b of the other core material. It is said. Then, the one end 66a is previously twisted in the direction opposite to the winding direction of the coil spring, and is screwed into the other end 66b, so that the two ends are connected in an abutting manner. The number of reverse twists of the one end 66a is equal to the number of twists at the time of screwing. Thereby, it is possible to prevent the two from being connected to each other while the torsional force remains.

The structure shown in FIG. 6 is a connecting member 70 as a separate part.
Is used. That is, the ends 66a, 66 of the two core materials
In b, a coil spring is tightly wound with the same diameter as the core material 66, and a large-diameter connecting member 70 capable of screwing the ends 66a and 66b is tightly wound with the coil spring in advance. Then, the connecting member 70 is connected to one of the end portions 6.
After being screwed into 6a (or 66b), the other end 66b (or 66a) reversely twisted as described above is screwed into the opposite side of the connecting member 70. This achieves a connection with each other.

Here, as shown in FIG. 1, a defective portion 71 is provided at one position in the circumferential direction of the fitting surface 59. That is,
One circumferential position of the ring gear fitting hole 56 is bulged radially outward over the entire length in the axial direction, and as a result, the fitting surface 59 is partially missing. The lacking portion 71 is provided because of the need for a work space, and more specifically, for the adjustment of the position of the damper ring 58 and the attachment of the snap ring 57.

The damper ring 58 has a defect 71
A pair of stopper portions 74a, 74b engaging with both inner side walls 72a, 72b are provided. That is, the stopper portions 74a and 74a are provided at the near-side end portions of the ring main body 65 located on both sides of the connection portion 69 between the ring units 68, respectively.
74b are formed integrally and protrude radially outward from the outer diameter of the ring.
Penetrates into the deficit 71 and both inner walls 72a, 7a
2b. There is no ring body 65 between the stopper portions 74a and 74b, and the core material 66 is exposed. The cross-sectional shapes of the stopper portions 74a and 74b are linear as shown in FIG. 3, but may be semicircular as shown in FIG.

The inner walls 72a, 72b and the stopper 74
By engagement with the a and 74b, the rotation of the damper ring 58 is restricted or prevented, and the phase shift due to the rotation of the damper ring 58 when the ring gear is attached can be prevented. As a result, the damper ring 58 remains at the desired phase position, so that expected damping characteristics can be expected.

Further, the provision of the defective portion 71 allows the user to insert his / her hand from here to appropriately pull the core member 66 to adjust the position of the damper ring 58 when the ring gear is attached. Thereby, the positioning of the damper ring 58 can be performed more accurately.

From the viewpoint of stopping rotation, one stopper may be used. This is because a rotation phase shift in one direction can be prevented. However, it is more advantageous to provide a pair of stopper portions, because rotation phase shifts in both directions can be prevented.

It is not necessary to limit the purpose to the working space, since the defective portion only needs to be at least engaged with the stopper portion. Any defects for other purposes are available for engagement of the stop.

Here, when the defective portion 71 is provided, the supporting load of the ring gear 31 is released only there.
When the ring gear 31 moves eccentrically, the ring gear 31 enters the missing portion 71 side, that is, the eccentric movement toward the missing portion 71 becomes remarkable. Ideally, uniform eccentric movement in the circumferential direction is desirable.
It is not desirable that such eccentricity only at a specific portion occurs.

Therefore, the ring main body 65 is removed from the damper ring 58 in the opposite region R where the defect 71 is axisymmetric. That is, only the core material 66 is exposed in the opposite region R located in the opposite phase portion of the defective portion 71 and having the same phase length as the defective portion 71. In this way, the support load of the ring gear 31 is released even in the opposite region R,
Eccentric movement toward the opposite region R is facilitated. Therefore, the support load is balanced, eccentric movement to a specific location is prevented, and uniform circumferential damping characteristics can be obtained. In this way, abnormal noise at the time of no load (at the time of Hi) can be prevented. Note that the mating surface 59 naturally exists in the opposite region R.

Here, if there is a missing portion 71, the press-fit load from the radial outside with respect to the damper ring is released only in that portion. The ring slackened inside. The damper ring of the present embodiment does not have such a variation because there is no variation in diameter and length and the ring rigidity is high.

The ring body 65 has only the stopper portions 74a and 74b in the defective portion 71 and does not exist in the opposite region R at all. Therefore, locations other than the region R opposite to the defective portion 71, that is, the ring body forming portions 75a, 75 on the left and right sides in FIG.
5b, the ring main body 65 is divided, and the divided ring bodies 67 are arranged at predetermined intervals in the longitudinal direction of the ring.
And the core 66 is exposed from the gap between the split ring bodies 67. In each of the ring body forming portions 75a and 75b, the divided ring bodies 67 located at both ends are longer than the other divided ring bodies 67.

Next, a method of manufacturing the damper ring will be described.

Although the damper ring 58 is formed by connecting two ring units 68 in one ring shape, here, it is formed by connecting one ring unit 68a shown in FIG. 7 in a ring shape. That is, the damper ring may be divided at any number of places. In the above example, the damper ring is divided at two places.

As shown in FIG. 7, the ring unit 68a
In, the ring main body 65 is removed at portions 71x and Rx located between the defective portion 71 and the opposite region R. Then, both ends of the core material 66 are connected to each other by the above-described method as shown in FIGS.

FIGS. 9 to 11 show a state of manufacturing the damper ring. Mold 7 consisting of upper mold 76 and lower mold 77 for production
The ring unit 68a is formed by holding the core material 66 therein, vulcanizing the rubber material, and integrating them. Then, both ends of the ring unit 68a are connected to form a damper ring.

The mold 78 has a linear shape, and the ring unit 68a is manufactured in a linear state as shown in FIG. The reason will be described later.

In the mold 78, a plurality of divided ring body forming portions 79 which are divided in the longitudinal direction and are separated at a predetermined interval, and the core member 66 which is located between the divided ring body forming portions 79 is fitted and held. And a core material holding portion 80 to be provided. The mold 78 includes a split ring body forming section 79 and a core material holding section 80.
Are alternately arranged on a straight line. The split ring body forming section 79 is a half-split cavity having the same shape as the split ring body 67, and the core material holding section 80 partitions between the split ring body forming sections 79 and allows only the passage of the core material 66. It has only an allowable half-shaped core material holding hole 81. The core material holding hole 81 is located at the center of the split ring body forming part 79, and accurately positions the core material 66 at the center of the ring.

A material injection port 82 and an air vent hole 83 are provided on the opposite side of each of the divided ring body forming portions 79, and each of the divided ring body forming portions 79 alone allows vulcanization of rubber.

In this case, first, the core material 66 is placed in the core material holding hole 81 of the lower mold 77, and an appropriate tension is applied to both ends of the core material 66 to hold the core material 66 straight. Then, cover the upper mold 76, close the split ring body forming portion 79,
At the same time, the divided ring body forming portions 79 are partitioned by the core material holding portion 80, and the core material 66 is held at the center of the ring by the core material holding portion 80.

In this state, when rubber, which is a material of an elastic body, is vulcanized from the material injection port 82 to each of the divided ring body forming portions 79, the rubber is applied around the core 66, and the divided ring bodies 67 are integrally formed. Formed. Thus, the ring unit 68
a is completed, and the product is taken out after the mold is divided. Thereafter, if necessary, burrs remaining in the material injection port 82 and the air vent hole 83 are cut off.

According to the above-described method, the core member 66 can be accurately held at the center of the ring or the split ring body 67 at the intermediate position in the longitudinal direction of the ring by the core member holding portion 80. Therefore, the core member 66 does not become eccentric, and the damping characteristic of the ring can be maintained as expected.

That is, without such a core material holding portion 80, the core material 66 can be held only at both ends, and there is a possibility that the center portion may become loose and the center may not be fixed to the ring center. According to this, since the core 66 can be held at the intermediate position, the core 66 can be determined at the center of the ring.

To put it the other way around, this is also a structural advantage in that the ring main body is divided to provide a gap between each other.
Thereby, the core material holding portion 80 is formed in the mold, and the core material 66 can be held at the middle position in the longitudinal direction.

For this purpose, it is preferable to provide a plurality of core material holding portions 80. Therefore, it is preferable to provide a plurality of gaps between the divided portions of the ring main body. However, if the centering of the core material can be performed, only one may be used. In any case, such a number is prioritized on the damper characteristics, and is optimally determined in consideration of manufacturing reasons and the like.

Here, the reason why the mold 78 is formed in a linear shape and the ring unit 68a having a linear shape is manufactured and connected later is to take into consideration a plurality of units as shown in FIG. That is, if the linear unit is used, the mold becomes smaller.
This is because, even when a plurality of dies are taken out at the same time, the mold space is narrowed, which is advantageous. Also, the mold itself is naturally smaller, which is advantageous for cost reduction.

However, as shown in FIG. 12, for example, it is also possible to arrange a plurality of molds in a square shape, to prepare a ring-shaped ring unit from the beginning, and to take a plurality of ring units. In this case, the mold and its space are enlarged,
Although it is disadvantageous in cost, it is preferable in function since the ring body or the split ring body 67 can be formed in an arc shape from the beginning. Conversely, if it is a straight shape, it must be bent when the ring is attached, which is not ideal in terms of function. However, in the present embodiment, since the relationship between the curvature and the length of the split ring body 67 is determined optimally, there is no functional problem even if it is a linear shape.

FIGS. 12 and 13 are schematic views of a mold.
Parts corresponding to the above-described parts are represented only by the corresponding reference numerals.

Next, another embodiment of the damper ring will be described.

As shown in FIG. 8, in this embodiment, the core member 66a is harder than the previous one and cannot be bent freely, that is, is made of a non-flexible body. And the core material 66a
Has a ring shape, and its outer diameter is a tooth 62 of the spline 62.
The diameter is slightly smaller than the inner diameter of a. Split ring body 67
Are located at the same circumferential position as the space 81 (circumferential gap) between the teeth 62a of the spline 62, are slightly shorter than the gap, and can enter the space 81.

According to this, when inserting the damper ring 58, the entire ring is pushed forward in the axial direction and slipped while the split ring body 67 is inserted into the space 81 while avoiding the teeth 62a of the spline 62. Can be inserted. The split ring body 67 can be pressed against the fitting surface 59 by the hard core material 66a, and the ring biting or the like when the ring gear is inserted can be prevented. Predetermined crushing allowances h ₂ and h ₃ may be provided on the outer peripheral side and / or the inner peripheral side of the split ring body 67. With this, the same operation and effect can be exhibited. Note that the shape of the split ring body 67 is
The core member 66a is positioned offset radially inward of the split ring body 67.

Various other embodiments of the present invention are conceivable. For example, the damper ring of the present embodiment has a total of twelve split ring bodies, which can be reduced to a minimum of two,
Conversely, the number can be increased from twelve. Further, the damper ring according to the present invention can be applied not only to the ring gear mounting portion of the planetary gear mechanism of the vehicle transfer, but also to a fitting portion between various members. That is, in the above-described embodiment, the large-diameter side member is the casing 7 and the small-diameter side member is the ring gear 31, but the present invention is not limited to this, and the damper ring of the present invention can be applied to any fitting portion.

[0075]

The present invention exhibits the following excellent effects.

(1) The core material can be accurately held at a predetermined position of the ring in the mold, and a desired damper ring can be manufactured.

(2) The size of the mold and the mold space can be reduced, which is advantageous for a plurality of molds.

[Brief description of the drawings]

FIG. 1 is a front view showing a damper ring of the present embodiment.

FIG. 2 is a sectional view taken along line II of FIG.

FIG. 3 is a cross-sectional view of the stopper portion taken along the line II-II of FIG.

FIG. 4 is a cross-sectional view taken along line II-II of FIG. 1, showing a cross section of another stopper portion.

FIG. 5 is a view showing a connection structure of a core material.

FIG. 6 is a diagram showing another connection structure of the core material.

FIG. 7 is a front view showing the ring unit before connecting the core members.

FIG. 8 is a front view showing another embodiment of the damper ring.

FIG. 9 is a plan view showing a lower mold and a core material according to a method of manufacturing a damper ring.

FIG. 10 is a sectional view taken along the line III-III of FIG. 9;

FIG. 11 is a sectional view taken along the line IV-IV in FIG. 9;

FIG. 12 is a schematic plan view showing the arrangement of another mold.

FIG. 13 is a schematic plan view showing the arrangement of dies.

FIG. 14 is a longitudinal side view showing a transfer, in which a left side is a front side and a right side is a rear side.

FIG. 15 is an enlarged view showing a mounting portion of a damper ring.

FIG. 16 is an enlarged view showing a state after the ring gear is mounted.

FIG. 17 is a schematic front view of a transfer.

FIG. 18 is a diagram showing a gap on the outer periphery of a ring gear.

FIG. 19 is a plan view showing a four-wheel drive vehicle, in which the left side is the front (F) and the right side is the rear (R).

[Explanation of symbols]

 58 Damper ring 65 Ring body 66 Core material 67 Split ring body 76 Upper die 77 Lower die 78 Mold 79 Split ring body forming part 80 Core material holding part 81 Core material holding hole

Continuation of the front page (72) Inventor Toshio Nojima 8th floor, Higashitacho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture 17th floor of Palais Mitsui Building Inside NOK Co., Ltd. Niigata Tomizawaya Nunogami 207 Special Work Co., Ltd. Address Isuzu Motors Fujisawa Plant F-term (reference) 3J066 AA22 BA01 BD05 BD07

Claims (2)

[Claims] 1. A damper ring in which a core material such as a coil spring is embedded in a ring main body made of an elastic body,
The ring body is divided in the longitudinal direction of the ring, and the divided ring bodies are arranged at predetermined intervals in the longitudinal direction of the ring, the divided ring bodies are connected to each other by the core material, and a gap between the divided ring bodies is provided. A method for manufacturing a damper ring, wherein the core material is exposed from a mold for manufacturing the damper ring, a plurality of divided ring body forming portions divided in a longitudinal direction and separated at a predetermined interval. And a core material holding portion that is located between these split ring body molding portions and in which the core material is fitted and held. In the mold, after holding the core material by the core material holding portion, A method for manufacturing a damper ring, comprising: vulcanizing an elastic material in a split ring body forming section; and applying the material around the core to form each split ring body. 2. The mold according to claim 1, wherein said mold has a linear shape as a whole.
2. The method for manufacturing a damper ring according to claim 1, wherein the split ring body forming portion and the core material holding portion are alternately arranged on a straight line in the mold.