JP5032614B2 - How to attach spring to U seal - Google Patents

Description

  The present invention relates to a method for mounting a spring in a U-seal groove.

  Conventionally, a seal having a structure in which a coil spring or a metal spring formed in a zigzag shape with a U-shaped cross section is mounted in a concave groove of a U seal has been known (see, for example, Patent Document 1).

JP 2008-69863 A

By the way, as shown in FIG. 9, the conventional spring mounting method is a method in which a straight metal spring 32 is sequentially inserted into the concave groove 31 of the U seal 30 in one direction 40 from one end 33. It was. The U seal 30 is a rubber material or a plastic material, and FIG. 9 shows a case where the concave groove 31 is opened in one direction parallel to the axis, but there are cases where the U seal 30 is opened in the radial inward direction. Although the spring 32 is a coil spring in FIG. 9, there is a case where the whole is formed in a zigzag shape with a U-shaped cross section. The lip is elastically biased in the direction of the open leg, and elastically greatly expands and contracts in the longitudinal direction. Therefore, the overall length of the spring changes, and the one end 33 at the start of charging and the other end 34 at the end of charging do not come into contact with each other (when the U-seal 30 is attached). Overlapping zones occur.
When the gap is opened (the elastic force in the leg opening direction of the U seal lip corresponding to the gap becomes weak), the sealing performance is locally lowered. On the other hand, when overlapping zones occur, the sealing performance becomes locally strong, and the elastic force in the leg opening direction of the U seal lip becomes uneven along the circumferential direction, which is not desirable.

  Therefore, as shown in FIG. 10 (conventionally), both ends 33 and 34 of the spring 32 are brought into contact (aligned), and the U-seal 30 is started to be charged, and the unidirectional 40 as indicated by the arrow 40 In the case of sequential loading, the spring pitch becomes uneven. For example, as shown in FIG. 11, both end portions 33 and 34 are in contact with each other without a gap, but a coarse pitch zone 36 having a coarse spring pitch in the circumferential direction and a fine pitch zone 37 having a dense spring pitch are generated. There is a problem that the elastic force in the leg opening direction of the U seal lip is small in the former and excessive in the latter. That is, in the former, the sealing performance may be lowered, and in the latter, contact with the mating member with an excessive contact surface pressure may cause early wear or excessive deformation.

Therefore, the spring mounting method to the U seal according to the present invention is a spring mounting method in which a spring cut to a predetermined length is mounted to the concave groove of the U seal, and both ends of the spring are in contact with each other. As the state, the both end portions are inserted into the concave groove, and then the central portion corresponding to half of the predetermined length is inserted into the concave groove, and then formed between the end portion and the central portion. This is a method of inserting a pair of remaining portions into the groove.
And it is preferable to attach a mark to the central portion before the insertion into the concave groove.

Further, in a spring mounting method in which a spring cut into a predetermined length is mounted in the U-seal groove, both ends of the spring are put into contact with each other and both ends are inserted into the groove. Next, the first central portion corresponding to half of the predetermined length is inserted into the concave groove, and then each of the pair of remaining portions formed between the end portion and the first central portion. In this method, two central portions are inserted into the groove, and then the remaining four portions are inserted into the groove.
And it is preferable to attach a mark to the first central part and the second central part before the insertion into the concave groove.

Alternatively, in a spring mounting method of mounting an entire annular spring closed with a seam into a U-seal groove, the seam of the spring is inserted into the groove, and then the seam A 180 ° opposite portion on the opposite side of 180 ° is inserted into the groove, and then a pair of remaining portions formed between the joint and the 180 ° opposite portion are inserted into the groove.
And it is preferable to attach a mark to the 180 ° opposite portion before inserting into the concave groove.

Further, in a spring mounting method in which an entire annular spring closed with a seam is mounted in the U-seal groove, the seam of the spring is inserted into the groove, and then 180 ° with respect to the seam. Insert the 180 ° opposite part on the opposite side into the concave groove, and then insert the 90 ° and 270 ° parts forming 90 ° and 270 ° with respect to the seam into the concave groove.
And it is preferable to attach a mark to the 180 ° opposite portion and the 90 ° portion and the 270 ° portion before the insertion into the concave groove.

  According to the present invention, it is possible to mount the springs in the concave groove of the U-seal in an orderly manner without causing gaps or overlaps at both ends of the spring evenly. Thereby, the resilience in the lip opening direction can be equalized over the entire circumference, and a seal that exhibits uniform sealing properties over the entire circumference can be obtained.

It is a figure for demonstrating the spring mounting method of this invention, Comprising: (a) is a perspective view of an example of a seal | sticker, (b) is the expanded cross-sectional view, (c) is an expanded cross-section which shows the other example of a seal | sticker. FIG. It is a figure for demonstrating the spring of the state before mounting | wearing with a U seal, Comprising: (a) is a top view of the linear spring of predetermined length, (b) is the whole annular | circular shape closed with the seam. It is a top view of a spring. It is the simplified explanatory drawing which showed one Embodiment of this invention in process order. It is the simplified explanatory drawing which showed other embodiment of this invention in process order. It is the simplified explanatory drawing which showed another embodiment of this invention in process order. It is the simplified explanatory drawing which showed other embodiment of this invention in order of the process. It is a perspective view explaining the process in the middle of the mounting method which concerns on this invention. It is a figure for demonstrating the spring mounting method of this invention, Comprising: (a) is a perspective view of the other example of a seal, (b) is the expanded cross-sectional view, (c) is an expansion of another example of a seal | sticker. It is a cross-sectional view. It is a perspective view which shows a prior art example. It is a perspective view which shows another prior art example. It is a perspective view for demonstrating the conventional problem.

Hereinafter, the present invention will be described in detail based on the illustrated embodiment.
In FIG. 1, as a seal S to which the spring mounting method according to the present invention is applied, a seal S provided with a metal spring 1 in a concave groove 3 of a U seal 2 is illustrated. The spring 1 is exemplified by a coil spring (coil spring). FIGS. 1A and 1B show the case of a U seal 2 having a groove 3 that opens in one direction parallel to the axis L _0, and FIG. 1C shows a groove that opens in a radial inward direction. The case of the U seal 2 having 3 is shown.

The U seal 2 to which the spring mounting method according to the present invention is applied may be any. In addition, the U seal 2 in which the concave groove 3 is opened outward in the radial direction may be used (not shown).
In FIG. 1, the U-seal 2 has triangular ridge-shaped seal lips 4, 5, 6 and 7, and the opening 3A of the groove 3 has a protrusion 8, 8 has a bowl shape, and prevents the spring 1 once inserted from being unexpectedly detached.

FIG. 2 (a) shows a coiled spring 1 in a free state with no U seal attached, and is a straight _one cut to a predetermined length L1. A method of mounting the spring 1 on the U seal 2 (by a mechanical mounting device such as a robot arm (not shown) or manually) will be described with reference to FIG. 3 or FIG. 3 and 4, the spring 1 is simplified and shown as a single solid line, and the U-seal 2 is shown as a simple double-dotted concentric double circle.

Figure 3 shows an embodiment of the present invention step (a) ~ (e) in this order, as shown in FIG. 3 (a) and FIG. 2 (a), the spring 1 which is previously cut to a predetermined length L ₁ As shown in FIG. 3 (b), both end portions A and B of FIG. 3 are brought into contact with each other (closed annular shape), and as shown in FIG. Insert into the groove 3 (at the same time). Next, as shown in FIGS. 3C to 3D and FIG. 7, the central portion M (see FIG. 3A) corresponding to half of the predetermined length L ₁ is formed in the groove 3 as indicated by the arrow K. To charge. As shown in FIG. 3 (a), the center M is preliminarily marked with oil-based ink or small dents before being inserted into the groove 3. Is desirable.

Next, as shown in FIGS. 3 (d) and 7, a pair of remaining portions (unmounted portions) 10, 10 formed between the end portions A, B and the central portion M are moved as indicated by an arrow N. When the groove 3 is inserted, the spring mounting state on the U seal 2 is completed as shown in FIG. 3E (see FIG. 1A).
In the mounting method of FIG. 3, the lengths of the remaining portions 10 and 10 of the right half and the left half are equal in the state shown in FIG. 3D (and FIG. 7). The spring pitch when the spring is completely installed is the same in the right half and the left half.

Next, another embodiment shown in FIG. 4 will be described. Both ends A and B of the spring 1 cut in advance to a predetermined length L ₁ shown in FIGS. 2 (a) and 4 (a). Are aligned in a butt shape, and are inserted into the concave groove 3 of the U seal 2 as shown in FIGS. 4 (b) to 4 (c). Next, as shown in FIGS. 4C to 4D, the first central portion M ₁ corresponding to half of the predetermined length L ₁ is inserted into the concave groove 3 as indicated by an arrow K.
Then, as show in FIG. 4 (b), the central portion of the end portion A, B and a pair of balance which is formed between the first central portion M ₁ (unmounted section) 10, 10 --- which Is referred to as the second central portion E, F-- is inserted into the groove 3 as indicated by arrows N, N (see FIG. 7) to obtain the state shown in FIG. 4) Insert the four (short) remaining portions 12, 12, 12, 12 into the groove 3 in the direction indicated by the arrow P in FIG. 4 (f) and FIG. 1 (a). Further, it is assumed that the spring mounting to the U seal 2 is completed.

Incidentally, as shown in FIG. 4 (a), first central portion M ₁ and the second central portion E, the F, a mark by (charging before to the groove 3) oily ink and a small dent, etc. It is preferable to attach it.
In the mounting method described with reference to FIG. 4, the lengths of the remaining portions 10 and 10 of the right half and the left half are equal in the state shown in FIGS. 4D and 7, and further, FIG. In the subsequent state shown in FIG. 4, the lengths of the four remaining portions 12 are equal to each other, and the spring mounting state (FIG. 4F) in which the spring pitch is uniform over the entire circumference is obtained (FIG. 4). 1 (a)).

  Next, in each of the different embodiments shown in FIG. 5 and FIG. 6, it is closed with a seam G as shown in FIG. 2 (b) and FIG. 5 (a) or FIG. 6 (a). Further, a method of mounting the entire annular spring 1 in the groove 3 of the U seal 2 is shown.

If it demonstrates from embodiment of FIG. 5, the seam G of the whole annular | circular shaped spring 1 will be inserted into the groove 3 as shown to FIG. Next, as shown in FIGS. 5B to 5C, the 180 ° opposite portion M ₃ opposite to the seam G is inserted into the concave groove 3 (as indicated by the arrow K). .
Incidentally, as shown in FIG. 5 (a), the 180 ° opposite unit M _3, and attaching a mark in advance --- before charging into the groove 3 --- oily ink or a small dent, etc. It is also preferable to keep it.
Thereafter, as shown in FIGS. 5C and 7, when the pair of remaining portions 10 and 10 formed between the joint G and the 180 ° opposite portion M ₃ are inserted into the groove 3 as indicated by the arrow N, as shown in FIG. As shown in FIG. 5E, the spring is completely attached to the U seal 2.

  In the mounting method described above with reference to FIG. 5, the seam G, which is the only point that exhibits uneven strength and elongation within the entire circumference of the spring 1, is first inserted into the concave groove 3 of the U seal 2, and then Therefore, the entire circumference can be shown in a uniform stretched state (spring pitch) in the circumferential direction. In addition, in the state shown in FIG. 5C, the lengths of the remaining portions 10 and 10 of the right half and the left half are equal to each other, so that the spring pitch in the spring mounting completed state in FIG. And the left half are equal to each other, and a uniform spring pitch can be obtained (see FIG. 1A).

Next, another embodiment shown in FIG. 6 will be described. First, as shown in FIGS. 6 (a) to 6 (b), the joint G of the entire annular spring 1 is formed into the groove 3 first. Insert. Then, charged as indicated by an arrow K shown in FIG. 6 (b) the 180 ° opposite portion M ₃ of 180 ° opposite to the joint G to the groove 3.
Thereafter, as shown in FIGS. 6C to 6D, the 90 ° portion E ₄ and the 270 ° portion F ₄ having center angles of 90 ° and 270 ° with respect to the joint G are indicated by arrows N. Thus, the groove 3 is inserted. Next, when the remaining remaining portion 12 is inserted into the concave groove 3 as indicated by an arrow P in FIG. 6D, the spring mounting completion state shown in FIG.
Incidentally, as shown in FIG. 6 (a), and 180 ° opposite portion M ₃ and 90 ° site E ₄ 270 ° site F _4, preferably keep attaching a mark by oily ink or small dents and the like.

In the case of the embodiment of FIG. 6, since the seam G is first inserted into the concave groove 3 of the U seal 2 (similar to FIG. 5), it is not within the entire circumference of the spring 1. There is an advantage that the influence of the seam G, which is a point exhibiting uniform characteristics, can be avoided, and it contributes to showing a uniform circumferential expansion / contraction state (spring pitch) over the entire circumference in the spring mounting completion state.
Then, in the state shown in FIG. 6C (and FIG. 7), the lengths of the remaining portions 10 and 10 of the right half and the left half are equal to each other, and further, as shown in FIG. In this state, the lengths of the four remaining portions 12 are equal to each other, and a spring mounting state (see FIGS. 6E and 1A) in which the spring pitch is uniform over the entire circumference is obtained.

However, Te is at 7 and FIG. 1 (a) (b), but the axis L ₀ and grooves 3 in one direction parallel are shown in the case of U seal 2 which is open, FIGS. 3 Any one of the six embodiments is naturally applicable to the U seal 2 in which the concave groove 3 opens in the radial inward direction as shown in FIG. The above-described spring loading operation is preferably performed using an automatic machine or a semi-automatic machine using a robot arm or the like, but is preferably performed manually.
In addition, as described above, when a mark is provided on the spring 1 side, a mark is also provided on the U seal 2 side at an accurate position corresponding to each so as not to adversely affect the seal performance. Is also desirable.

Next, FIG. 8 is a view replacing FIG. 1 and shows that the above-described spring mounting method according to the present invention can be applied to the seal S having the shape and configuration illustrated in FIG. That is, in FIG. 8, this seal S has a U seal 2 made of plastic or rubber, and a spring 1 having a U-shaped or V-shaped cross section mounted in the groove 3 thereof. 1 consists of a thin metal plate, and the whole is formed in a zigzag ring shape. U seal 2 seals S shown in FIG. 8 (a) (b), the groove 3 so that the axis L ₀ and the opening in one direction parallel are formed, or, as shown in FIG. 8 (c) In addition, the groove 3 opens in the radial inward direction. In addition, the protrusions 8 and 8 are provided in a bowl shape so that the opening 3A of the groove 3 is narrow. The point having triangular ridge-shaped seal lips 4, 5, 6, and 7 is the same as in FIG.
Although not shown, the spring mounting method according to the present invention can be applied to the spring 1 having a shape other than that described above, and the U-seal 2 has the seal lips 4, 5, 6, 7 as well. In addition to FIG. 1 and FIG. Furthermore, the seal S having a configuration in which an O-ring or another sealing material is mounted in the concave groove 3 together with the spring 1 is also free (not shown).

As described above, according to the present invention, in the spring mounting method in which the spring 1 cut to the predetermined length L ₁ is mounted in the concave groove 3 of the U seal 2, both ends A and B of the spring 1 are mutually connected. The both ends A and B are inserted into the concave groove 3 as a contacted butted state, and then the central portion M corresponding to half of the predetermined length L ₁ is inserted into the concave groove 3. Since it is a spring mounting method in which the pair of remaining portions 10 and 10 formed between the end portions A and B and the central portion M are inserted into the concave groove 3, it can be mounted with a uniform spring pitch, and , There is no gap between both ends A and B, conversely, they do not overlap, and are mounted with a uniform spring pitch on the entire 360 ° circumference, and the elastic force in the leg opening direction of the U seal lip is uniform over 360 ° Excellent sealing performance as a seal and no early leakage due to local wear.
In addition, by attaching a mark to the central portion M before insertion into the concave groove 3, the opposite side of 180 ° can be inserted at an accurate circumferential position.

Further, in the spring mounting method in which the spring 1 cut to a predetermined length L ₁ is mounted in the concave groove 3 of the U seal 2, both ends A and B of the spring 1 are brought into a butted state in contact with each other. The portions A and B are inserted into the concave groove 3, and then the first central portion M ₁ corresponding to half of the predetermined length L ₁ is inserted into the concave groove 3, and then the end portion The second central portions E and F of the pair of remaining portions 10 and 10 formed between A and B and the first central portion M ₁ are inserted into the concave groove 3, and then the four remaining portions In the method of inserting 12, 12, 12, and 12 into the concave groove 3, first, it is inserted into the concave groove 3 at an accurate position every 90 °, and then the remaining portions 12, 12 are inserted. , 12,12 can be installed with a more uniform spring pitch, and it has excellent sealing performance and wear resistance as a seal.
In addition, the first central portion M ₁ and the second central portions E and F are provided with marks before being inserted into the concave groove 3, so that a more accurate circumference can be obtained every 90 °. It can be inserted in the direction position.

In the spring mounting method of mounting the entire annular spring 1 closed with the seam G into the concave groove 3 of the U seal 2, the seam G of the spring 1 is inserted into the concave groove 3, The 180 ° opposite portion M ₃ 180 ° opposite to the seam G is inserted into the groove 3 and then a pair of remaining portions formed between the seam G and the 180 ° opposite portion M _3. Since 10 and 10 are inserted into the concave groove 3, the spring pitch can be made uniform, excellent sealing performance can be exhibited as a seal, and local abnormal wear of the seal lip can be prevented.
Further, in the 180 ° opposite portion M ₃ are, by previously attaching a mark before loading into the groove 3, and can be charged with 180 ° opposite to the exact circumferential position.

In the spring mounting method of mounting the entire annular spring 1 closed with the seam G into the concave groove 3 of the U seal 2, the seam G of the spring 1 is inserted into the concave groove 3, in the 180 ° opposite portion M ₃ of 180 ° opposite to the joint G was charged into the groove 3, then, 90 ° site E ₄ forming the 90 ° and 270 ° with respect to the joint G 270 Since the portion F ₄ is inserted into the groove 3, first, it is inserted into the groove 3 at an accurate position every 90 °, and then the remaining portions 12, 12, 12, Since 12 is inserted, it can be mounted with a more uniform spring pitch, and it has excellent sealing performance and wear resistance as a seal.
In addition, a mark is attached to the 180 ° opposite portion M ₃ and the 90 ° portion E ₄ and the 270 ° portion F ₄ before inserting into the concave groove 3, so that the layer is increased every 90 °. It is possible to insert in an accurate circumferential position, and the screw pitch can be made even more highly accurate when the spring is completely installed.

1 Spring 2 U seal 3 Groove
10 Remaining part (unmounted part)
12 Remaining part A, B End L ₁ Predetermined length M Central part M ₁ First central part E, F Second central part M ₃ 180 ° opposite part E ₄ 90 ° part F ₄ 270 ° part

Claims (8)

In the spring mounting method in which the spring (1) cut to a predetermined length (L ₁ ) is mounted in the concave groove (3) of the U seal (2), both ends (A) (B ) Are brought into contact with each other, and both end portions (A) and (B) are inserted into the groove (3), and then a central portion (M) corresponding to half of the predetermined length (L ₁ ). ) Is inserted into the groove (3), and then a pair of remaining portions (10) (10) formed between the end portions (A) (B) and the central portion (M) are formed into the groove. (3) A method of attaching a spring to a U-seal, characterized by being inserted into   2. The method of attaching a spring to a U seal according to claim 1, wherein a mark is attached to the central portion (M) prior to insertion into the concave groove (3). In the spring mounting method in which the spring (1) cut to a predetermined length (L ₁ ) is mounted in the concave groove (3) of the U seal (2), both ends (A) (B ) Are brought into contact with each other and both end portions (A) and (B) are inserted into the groove (3), and then the first central portion corresponding to half of the predetermined length (L ₁ ). (M ₁ ) is inserted into the concave groove (3), and then a pair of remaining portions (10) formed between the end portions (A) (B) and the first central portion (M ₁ ). Insert each second central portion (E) (F) of (10) into the concave groove (3), and then insert the remaining four parts (12) (12) (12) (12) into the concave groove A spring mounting method characterized by being inserted into the groove (3). The spring according to claim 3, wherein a mark is attached to the first central portion (M ₁ ) and the second central portion (E) (F) before insertion into the concave groove (3). Wearing method. In the spring mounting method of mounting the entire annular spring (1) closed with the seam (G) to the concave groove (3) of the U seal (2), the seam (G) of the spring (1) is The concave groove (3) is inserted, and then the 180 ° opposite portion (M ₃ ) opposite to the seam (G) is inserted into the concave groove (3). Spring mounting to U seal, characterized in that a pair of remaining parts (10) (10) formed between the seam (G) and 180 ° opposite part (M ₃ ) are inserted into the groove (3). Method. 6. The method of attaching a spring to a U seal according to claim 5, wherein a mark is attached to the 180 ° opposite portion (M ₃ ) before insertion into the concave groove (3). In the spring mounting method of mounting the entire annular spring (1) closed with the seam (G) to the concave groove (3) of the U seal (2), the seam (G) of the spring (1) is The concave groove (3) is inserted, and then the 180 ° opposite portion (M ₃ ) opposite to the seam (G) is inserted into the concave groove (3). Spring mounting on U seal, characterized in that 90 ° part (E ₄ ) and 270 ° part (F ₄ ) forming 90 ° and 270 ° with respect to (G) are inserted into the groove (3). Method. The 180 ° opposite portion (M ₃ ) and the 90 ° portion (E ₄ ) and the 270 ° portion (F ₄ ) are marked before insertion into the concave groove (3). 7. A method of attaching a spring to the U-seal according to 7.

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