KR20200071228A - Synchronizer ring for transmission having lug reinforced stress, and manufacture method thereof - Google Patents

Abstract

The present invention relates to a synchronous ring for a transmission with a stress-enhanced lug, which includes a body, an outer gear, and a lug. The lug includes: a base unit extended from the body; and a pressing unit processed by pressing a part of the base unit against the longitudinal direction to increase the radius of curvature during refraction. Accordingly, a fracture surface of the lug caused by cutting the lug during a stamping process is removed, and fine cracks occurring when the lug is bent are prevented or a progress thereof is blocked, thereby improving stress at a bent part.

Description

Synchronizer ring for transmission having lug reinforced stress, and manufacture method thereof

The present invention relates to a synchronous ring for a transmission, and more specifically, a synchronous ring for a transmission having a stress-enhanced lug to adjust the thickness in consideration of a refractive radius while deforming both sides of the lug in the synchronous ring, and It relates to a manufacturing method.

In general, the transmission is installed between the clutch and the propulsion shaft serves to increase or decrease the rotational force of the engine according to the driving state of the vehicle and transmit it to the driving wheel.

In addition, as an example of the transmission, a synchro mesh type transmission is spline-coupled to a main shaft, and a sleeve moving in the axial direction by a shift fork is spline-coupled to an outer circumferential surface of the synchronization hub. In addition, a synchronous cone is coupled to one side of the synchronous hub, and a synchronous ring moving in the axial direction of the main axis is installed on the outer circumferential surface of the synchronous cone. Here, the synchronous ring serves to cause a smooth synchronization action when the hub gear and the sleeve coupled to the main shaft move under the action of the shifting fork to synchronize with the clutch gear mounted to idle on the main shaft.

The synchronous ring 10 is, for example, as shown in Fig. 1, the planarly circularly shaped body 11, the outer surface of the body 11 is protruded outwardly, and a large number of sets and one set It may be made to include the outer gear 12 disposed at regular intervals, and the lugs 13 processed between the sets of the outer gear 12.

At this time, the lug 13 can be processed by protruding from the body 11 to a certain length, and then bent in one direction. As shown in FIG. 2, the lug 13 processes the caulking portion 14 more concavely than the other portion through a caulking operation on the refracting portion B to secure a radius of the refraction portion, so that the refraction operation can be easily performed. Can be.

However, since the bending portion B of the lug 13 is thin due to the concave caulking portion 14, the durability and fatigue limit of the lug 13 rapidly decreases while using the synchronous ring 10, which The lug 13 may cause short-term or easy breakage by external force. Therefore, there is a problem that the service life of the synchronous ring 13 is shortened, and the replacement and post-management costs are increased.

Meanwhile, the synchronous ring may be manufactured by cutting an iron plate having the same thickness through a stamping process, and bending the cut iron plate. As an example, looking at the process for cutting the iron plate 21, as shown in FIG. 3, it is made to place the iron plate 21 on the die 20 and stamp it with a punch 22 to cut it. At this time, the cut portion F and the front end surface S are generated due to the gap G between the iron plate 21 and the die 22. Here, the front surface becomes a clean and smooth cross-section, while a coarse and fine crack or scratch occurs on the surface of the fracture. Such cracks or scratches become a factor in which stress is concentrated, and if stress is repeatedly applied for a long time, it may cause fatigue failure. Therefore, if this portion is refracted, the shear surface must be refracted to face the outside to ensure reliability of life. Inevitably, when the fracture surface F is refracted to the outside, cracks or scratches must be removed to ensure durability and reliability of life.

Therefore, in the case of the lug portion in the cut steel plate, a fracture surface (F) and a shear surface (S) are generated on both sides on the front side, and the fracture surface (F) must always be refracted in a specific direction or the fracture surface ( There is a problem in that a polishing operation for removing cracks or scratches of F) should be performed.

Republic of Korea Registered Patent No. 10-1860221 (registered on May 15, 2018) Republic of Korea Registered Patent No. 10-0834118 (registered on May 26, 2008) Republic of Korea Registered Patent No. 10-1387068 (registered on April 14, 2014) Republic of Korea Patent Publication No. 10-997-0021817 (1997.05.28. published) Republic of Korea Registered Patent No. 10-0821363 (Registration on April 3, 2008)

The object of the present invention was devised to solve the above-mentioned problem, by squeezing both sides of the synchronous ring lug on the front surface of the synchronous ring to make it thinner than the other parts, structurally removing the fracture surface, and the thickness and refraction of both sides It is to provide a synchronous ring for a transmission having a stress-enhanced lug to optimize the radius ratio and a method for manufacturing the same.

In order to achieve the above object, the synchronous ring for a transmission having a stress-enhanced lug according to the present invention is a synchronous ring provided with a body, an outer gear and a lug, wherein the lug extends from the body and when refracted It may be made to include a pressing portion processed by pressing a portion of the base portion against the longitudinal direction to increase the radius of curvature.

Here, the pressing portion may be an extension portion processed to be thinner than the base portion while protruding outward by pressing the base side of the base portion.

In addition, the pressing portion may be a curved portion that is concavely processed by pressing the center portion of the upper surface of the base portion on the front surface to form an inner surface during refraction, or a crack blocking groove that is concavely processed on both sides when the outer surface is formed during refraction.

In addition, the extension portion is located on both sides of the base portion on the front side, and may be extended in an outward direction by being pressed in a single or inclined shape or a rounded shape by pressing the top or bottom or top and bottom of the side portion of the base portion.

In addition, the extension portion may be in the form of extending outwardly so that the upper and lower portions are pressed on both sides of the foundation portion and have the same center line (C) as the foundation portion.

In addition, the extended portion or the curved portion or the crack-preventing groove may be processed from the base portion to the tip of the base (B) or the peripheral portion (N) including a portion of the refractive portion (B) and the body, or the body of the base portion. .

In addition, the range of the thickness t1 of the portion refracted at the extension may be a radius of curvature (K)±0.3 mm.

On the other hand, the method for manufacturing a synchronous ring for a transmission with a stress-enhanced lug according to the present invention is a method for manufacturing a synchronous ring with a body, an outer gear and a lug, by stamping a steel plate of a certain thickness to have a foundation. 10th process (S10) of processing the lug: 20th process (S20) of processing the pressing portion so as to increase the radius of curvature (K) by pressing a portion of the base portion on the front surface.

Here, in the twentieth step (S20), the extension portion can be processed to a thickness thinner than the foundation portion while protruding outward by pressing the side of the foundation portion on the front side.

In addition, in the twentieth step (S20), the central portion of one surface of the base portion forming the inner surface of the bent face is pressed to process the curved portion concavely, or on both sides of one surface of the base portion forming the outer surface of the bent lug. It is possible to process crack blocking grooves in each concave.

In addition, the twentieth step (S20) may press the upper portion, the lower portion, or the upper portion and the lower portion of both sides of the base portion on the front side so that the extension portion is in the form of a frontal end or an inclined shape or a rounding shape.

In addition, it is possible to press the upper and lower portions of the foundation so that the foundation and the extension have the same center line (C).

In addition, the extended portion or the curved portion or the crack-preventing groove may be processed from the base portion to the tip of the base portion connected to the body portion B, or the periphery portion N including the portion of the bend portion B or the body, or the base portion. .

And it can be pressed so that the thickness (t1) of the extension portion is a radius of curvature (K) ±0.3mm at the refraction site.

According to the present invention as described above, by processing the extended portions protruding outwardly on both sides of the base portion of the lug, the fracture surface of the lug generated while being cut by the stamping process is removed, and the occurrence of fine cracks that may occur when the lug is bent is generated. It is prevented, and there is an effect that the stress at the bent portion can be improved.

In addition, by setting the thickness of the extension in consideration of the radius of curvature in the state where the lug is bent, stable bending is ensured by the combination of the thick base portion and the thin extension portion, crack generation at the bend portion is prevented, and As the stress is strengthened, damage due to external force is minimized, and the service life can be extended.

In addition, by processing the curved portion by concave the center portion of the upper surface of the lug and processing the crack blocking groove on both sides of the lower surface, the inner radius of curvature during refraction is increased to improve the stress and sufficiently disperse the impact transmitted from both sides to provide durability. There is an effect that can be strengthened.

The following drawings attached in this specification are intended to illustrate preferred embodiments of the present invention, and serve to further understand the technical idea of the present invention together with the detailed description of the present invention, so the present invention is limited only to those described in those drawings. And should not be interpreted.
1 is a perspective view schematically showing a conventional synchronous ring.
FIG. 2 is a cross-sectional view taken along line AA in FIG. 1.
3 is a side view schematically showing a process of stamping an iron plate to produce a synchronous ring.
4 is an enlarged view of a lug portion before refraction of a synchronous ring according to a preferred embodiment of the present invention.
5 is a bottom perspective view showing another form of the lug shown in FIG. 4.
6 is a side view schematically showing a state in which the lug of FIG. 5 is refracted.
7 to 9 are enlarged views showing another form of the lug shown in FIG. 3.
10 is a flowchart illustrating a method of manufacturing a synchronous ring according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments will be described in detail with reference to the accompanying drawings so that those skilled in the art to which the present invention pertains can easily implement the present invention. However, in the detailed description of the operating principle for the preferred embodiment of the present invention, if it is determined that a detailed description of related known functions or configurations may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted.

The synchronous ring for a transmission with a stress-enhanced lug according to the present invention may include a pressurized portion processed by pressing both sides of the lug to make the thickness thinner or concavely pressing the central portion. The pressing portion may be in the form of an extension portion 120 or a curved portion 130 or a crack blocking groove 140 according to an embodiment. Hereinafter, a detailed description of this will be described in detail with reference to the accompanying drawings.

<Configuration>

A synchronous ring for a transmission with a stress-enhanced lug according to a preferred embodiment of the present invention will be described with reference to FIG. 4. As shown in FIG. 4, when the lug 100 portion of the synchronous ring (see FIG. 1) is enlarged, the lug 100 includes a base portion 110 processed in a form protruding from the body 200 of the synchronous ring, It may be provided with an extension 120 processed by pressing the surface to have a step on both sides of the base portion 110 on the front.

Here, the extended portion 120 is cut and cut the iron plate by a stamping process in the state in which the base portion 110 protrudes from the body 200, a fracture surface (see F, see FIG. 3) occurs on both sides of the front and / or It can be processed by pressing downward. The extension part 120 may be processed only to the refracting part B of the lug 100, and as shown in FIG. 4, not only the refracting part B of the lug 100, but also the peripheral part N adjacent to the refracting part B ).

In addition, the extension portion 120 may be processed only in the bent portion of the lug 100, as in FIGS. 5, 7 and 8, the length of the lug 100 protruding from the body 200, that is, the body 200 ) May be processed from the base to the tip of the foundation 110 connected. At this time, the connection portion where the base portion 110 and the extension portion 120 intersect may be rounded or orthogonal to have a constant curvature. For example, the extension part 120 may be processed such that the upper and lower portions of the front part base part 110 are pressed to protrude and extend about the center line C on the front surface, and a fracture surface F occurs. It can be processed by pressing only the upper portion.

Meanwhile, FIG. 6 schematically shows a modified form when the lug 100 having the base portion 110 and the extension portion 120 is refracted. Looking at this, when the lug 100 is refracted with a certain curvature, the extension part 120 has a thickness t1 of the refraction part B thinner than the thickness t2 of the other part, and this refraction part B The thickness t1 of may be approximately equal to or similar to the radius of curvature K. That is, in the case of refraction, the extension portion 120 may be processed so that the thickness t1 of the extension portion 120 is set in consideration of the radius of curvature K. For example, when the radius of curvature K is 1.0, the range of the thickness t1 of the extension 120 may be processed to 1.0±0.3 mm.

If the thickness of the unprocessed lug of the extended portion 120 is 2.0 mm and the radius of curvature (k) is 0.5, the radius of curvature (K) is too large compared to the thickness, so that the outer surface of the curvature is stretched. A number of fine cracks may occur, and when the fracture surface F faces outward, the occurrence of fine cracks may be further weighted. For this reason, it may be a cause of breakage of the lug and shortening of the life. Therefore, as described above, the extension portion 120 is processed at both sides where the fracture surface F occurs in the lug 100, and the thickness t1 of the extension portion 120 of the curvature portion is equal to the radius of curvature K0. By making it similar or similar, it is possible to remove the fracture surface F and also prevent the occurrence of fine cracks that may occur during curvature.

On the other hand, the extension portion 120 of the lug 100 may be formed in a step shape as shown in FIGS. 4 and 5, or may be formed obliquely as shown in FIG. 7, or may be formed as a curved surface as shown in FIG. To explain in more detail, in the case of FIG. 7, the extension part 120 is pressurized at both sides of the base part 110 of the lug 100 with a chamfer tool, and inclined surfaces are processed at the top and/or bottom of the front face. Can be molded. In addition, in the case of FIG. 8, the extension portion 120 may be formed by pressing both sides of the base portion 110 of the lug 100 with a rounding tool to form a curved surface at the top and/or bottom. At this time, concave grooves may be generated in the center of the center due to the rounding process on the upper and lower sides in the longitudinal direction.

<Example>

Another embodiment of a synchronous ring according to the present invention will be described with reference to FIG. 9.

Referring to FIG. 9, the lug 100 is a curved portion that is concavely processed by pressing downward on the upper surface of the central portion with respect to the longitudinal direction of the base portion 110, unlike the embodiments of FIGS. 4, 5, 7 and 8 The crack blocking grooves 140 respectively processed on both sides of the lower surface 130 may be provided. The curved portion 130 or the crack blocking groove 140 is similar to the extension portion 120 described above, the refraction portion (B) of the base portion 110, or the refraction portion (B) and the peripheral portion including a part of the body 200 (N) Or, it can be processed from the base portion connected to the body 200 of the base portion 110 to the tip.

The curved portion 130 may be recessed downwardly in the middle portion excluding both sides on the front side. The curved portion 130 may be processed on one surface that becomes an inner surface when the lug 100 is bent. In more detail, the curved portion 130 has an approximately “U” shape, and a flat bottom surface, a sloped side surface of a predetermined length, and a side and a bottom surface, a contact portion of the side surface and both sides can be processed to achieve a certain curvature. have. The curved portion 130 forms an inner surface when the lug 100 is bent, and the inner surface increases the radius of curvature K, so that the stress with respect to the radius of curvature K is maximized.

The crack blocking grooves 140 are respectively located at both sides of the lower surface, and can be machined in the longitudinal direction at positions where a certain length comes in from the both ends to the center. At this time, the lower surface between the crack blocking grooves 140 on both sides may be processed into a gentle curved surface. The crack blocking groove 140, like the curved portion 130, can also prevent the phenomenon of fine cracks and scratches from progressing to the intermediate portion.

Of course, the curved portion 130 and the crack blocking groove 140 may be processed only in the refracting portion of the lug 100, as shown in FIG. 9, or may be processed for the entire length of the lug 100.

<Production Method>

Hereinafter, a method for manufacturing a synchronous ring for a transmission having a stress-enhanced lug according to a preferred embodiment of the present invention will be described with reference to FIGS. 3 and 10.

First, a tenth step (S10) of placing the iron plate 21 on the die 20 and stamping it with a punch 22 while cutting to a certain length to process the body and the lug 100; 20th step (S20) of processing both sides of the lug 100 generated by stamping in a single or inclined shape or a rounding shape, and refracting the lug 100 in one direction. Here, the tenth step (S10) and the twentieth step (S20) may be performed in a batch in a stamping device, or may be performed separately in a separate device. Further, after the twentieth step (S20), the iron plate 21 may be bent to produce a synchronous ring.

First, in the tenth process (S10), as shown in FIG. 3, the iron plate 21 is placed on the die 20, and at least one of the body 200, the outer gear 12 (see FIG. 1) and the lug 100 is placed. The component can be stamped with a punch 22 to be machined. At this time, the iron plate 21 can be cut to a certain length according to the diameter of the synchronous ring to be made.

Finally, the twentieth step (S20) may include a twenty-first step (S21) for pressing both sides of the lug 100 on the front side, and a twenty-second step (S22) for pressing the central portion of the lug 100. have.

Here, the 21st step () removes the fracture surface (F) generated while stamping the lug 100 on the iron plate, and to prevent the generation of fine cracks that may occur on the outer surface when the lug 100 is refracted. The extended portion 120 may be generated by pressing both sides where the fracture surface F is generated. Looking more closely, the extension portion 120 is formed in the form of an upper portion to remove the fracture surface F by pressing only the upper portion of both sides of the base portion 110 of the lug 100 on the front surface, or by pressing only the lower portion The lower portion may be made into a single shape, or the upper and lower portions may be pressed together to make the upper and lower portions into a single shape.

In addition, the extension portion 120 is processed to protrude and extend around the center line (C) by pressing the upper and lower portions of both sides on the front side as shown in FIGS. 4 and 5, and removes the fracture surface (F) and FIG. As in, it is possible to reduce the incidence of fine cracks during refraction. And the thickness of the extension 120 may be processed in consideration of the radius of curvature (K). As shown in FIG. 6, the radius of curvature (K) and the thickness (t1) may be the same or similar. For example, when the radius of curvature (K) is 1, the range of the thickness (t1) is 1±0.3mm. Can be. For this reason, by preventing the occurrence of fine cracks on the outer surface of the lug 100 with respect to the radius of curvature K, the thickness t1 is made as thick as possible, so that the stress against the curvature in the curvature region is maximized.

In addition, as shown in Figure 4, the extension portion 120 may be processed only to the bend portion B of the lug 100, for convenience of the process, or to the bend portion (B) to improve the stress to the peripheral portion N It can also be processed to the periphery (N) of B). As another example, the extension part 120 may be processed from the base to the tip of the lug 100 as shown in FIG. 5. Due to the extension portion 120, the lug 100 is easily bent, and stress on the bent portion B may be strengthened.

In addition, various types of tools may be used to press both sides of the lug 100, and the upper and/or lower sides of the side may be inclined as shown in FIGS. 4 and 5 according to the shape of the tool. The shape and, as shown in FIG. 8, may be processed into a rounding shape, and the extension portion 120 may be processed in various other shapes. These various shapes may be possible depending on the shape of the pressing tool. Of course, both sides of the lug 100 may be pressurized in either form, and then a polishing process may be performed on the surface of the pressed portion.

On the other hand, the 22nd step (S22), as shown in Figure 9, in order to prevent the phenomenon of the micro-cracks generated on both sides of the lug 100 by the stamping process to proceed to the central portion of the curved portion of the lug 100 (130) ) And the crack blocking groove 140 can be processed. In one example, the curved portion 130 is processed on one side of the site side where the shear surface occurs, the crack blocking groove 140 is processed on one side of the site side where the fracture surface occurs, and the curved portion 130 is positioned inside. It is preferable to refract upward. The curved portion 130 and the crack blocking groove 140 may improve stress on curvature, disperse stress transmitted from both sides to the central portion, and improve durability.

At this time, the curved portion 130 may be made when the lug 100 is refracted upward, to facilitate the refraction while increasing the inner radius of curvature to maximize the stress on the curvature in the curvature region.

In addition, the crack blocking groove 140 is a groove for preventing cracks from occurring on both sides due to external impacts after the lug 100 is refracted, and the cracks gradually progress toward the central portion. Can be.

In addition, the curved portion 130 and the crack blocking groove 140 may be processed using a separate pressing tool during the stamping process, or may be processed by performing a separate pressing process.

As described above, those skilled in the art to which the present invention pertains will understand that the present invention may be implemented in other specific forms without changing its technical spirit or essential features. Therefore, it should be understood that the above-described embodiments are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims of the patent registration to be described later rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be interpreted to be included in the scope of the present invention. do.

100: Rug
110: basic part
120: extension
130: curved part
140: crack blocking groove
200: body
B: Bend area.
N: Surrounding part.

Claims (12)

In a synchronous ring comprising a body, an outer gear and a lug,
The lug 100 includes a base portion 110 extending from the body 200 and a pressing portion processed by pressing a portion of the base portion 110 against the longitudinal direction to increase the radius of curvature (K) during refraction. Synchronous ring for transmission with a stress-enhanced lug characterized in that.
In claim 1,
The pressing portion,
It is an extension part 120 processed to be thinner than the foundation part 110 while protruding outward by pressing the bottom side of the foundation part 110 on the front side, or
The curved part 130, which is concavely processed by pressing the center portion of the upper surface of the foundation 110 on the front surface to form an inner surface at the time of refraction, and the crack blocking grooves 140, which are concavely processed at both sides when the outer surface is formed when refraction ) A synchronous ring for a transmission with a stress-enhanced lug, characterized in that it comprises at least one.
In claim 1,
The extension portion 120 is located on both sides of the base portion 110 on the front, and the upper or lower portion or the upper and lower portions of the side portion of the base portion 110 is pressed to form a stepped or inclined shape or a rounded shape. Synchronous ring for a transmission having a stress-enhanced lug, characterized in that it is pressed and extended outward.
In claim 3,
The extension portion 120 has a stress strengthened, characterized in that the upper and lower portions are pressed from both sides of the base portion 110 on the front side to have an outwardly extended shape to have the same center line (C) as the base portion 110. Synchronous ring for transmission with lugs.
In any one of claims 2 to 4,
The extension part 120 or the curved part 130 or the crack preventing groove 140 is a refraction part (B) of the base part 110, or a peripheral part (N) including a part of the refraction part (B) and the body 200 Alternatively, a synchronous ring for a transmission with a stress-enhanced lug, characterized in that it is machined from the base to the tip connected to the body 200 of the foundation 110.
In any one of claims 2 to 4,
The range of the thickness (t1) of the portion bent in the extension portion 120 is a synchronous ring for a transmission with a stress-enhanced lug, characterized in that the radius of curvature (K) ± 0.3mm.
In the method of manufacturing a synchronous ring having a body, an outer gear and a lug,
A tenth process (S10) of processing the lug 100 having the base 110 by stamping the iron plate 21 of a certain thickness:
A synchronous ring for a transmission with a stress-enhanced lug, comprising; a 20th process (S20) of pressing the partial portion of the foundation 110 on the front surface to process the pressing portion.
In claim 7,
In the 20th step (S20),
On the front side, by pressing the lateral side of the base portion 110 while protruding outward, the extension portion 120 is processed to a thickness thinner than the base portion 110, or
Pressing the central portion of one surface of the base portion 110 constituting the inner surface of the lug 100 refracted on the front surface to process the curved portion 130 concavely,
For a transmission with a stress-enhanced lug, characterized in that the crack blocking grooves 140 are respectively recessed on both sides of one surface of the base portion 110 constituting the outer surface of the lug 100 refracted on the front side. Synchronous ring.
In claim 8,
In the twentieth step (S20), the upper portion, the lower portion, or the upper and lower portions of both sides of the base portion 110 on the front side is pressed so that the extension portion 120 is in the form of a front end or an inclined shape or a rounding shape. Synchronous ring for transmission with a stress-enhanced lug characterized in that.
In claim 9,
Synchronization ring for a transmission with a stress-enhanced lug, characterized in that the upper and lower portions of the base portion 110 are pressed so that the base portion 110 and the extension portion 120 have the same center line (C).
In any one of claims 8 to 10,
On the front, the extension portion 120 or the curved portion 130 or the crack blocking groove 140, the refraction portion (B) of the base portion 110, or the refraction portion (B) and the peripheral portion including part of the body 200 ( N) Or, a synchronous ring for a transmission with a stress-enhanced lug, characterized in that it is processed from the base to the tip connected to the body 200 of the foundation 110.
In any one of claims 8 to 10,
Synchronization ring for a transmission with a stress-enhanced lug, characterized in that the thickness (t1) of the extension portion 120 is pressed to be a radius of curvature (K)±0.3 mm at the refraction site.

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