KR20230084987A - Terminal - Google Patents

Abstract

The present invention is a terminal. The terminal 10 of the present invention includes a body portion 12, a coupling portion 14 coupled to the counterpart terminal, and a barrel portion 20 integrally formed with the body portion 12 and coupled to the wire 30. can do. The barrel part 20 includes a first barrel body 22 and a second barrel body 22', and the first barrel body 22 includes a first wire barrel 24 and a first insulation barrel 26 ) may extend in opposite directions to each other, and the second wire barrel 24' and the second insulation barrel 26' may extend in opposite directions to each other in the second barrel body 22'. The first wire barrel 24 and the second wire barrel 24' may extend in opposite directions.

Description

Terminal {Terminal}

The present invention relates to terminals.

A terminal is generally installed in a housing of a connector and coupled with a terminal of a mating connector to perform electrical connection. Such a terminal has a female terminal and a male terminal coupled to each other, and a part of the male terminal is inserted into the female terminal to make an electrical connection.

Such a terminal is made of a conductive material, and is generally made of a conductive metal material. A typical terminal has a coupling part for coupling with a counterpart terminal on one side of the body, and a barrel for coupling with a wire on the other side of the body. The barrel part may generally have a wire barrel and an insulation barrel. The wire barrel is coupled by surrounding the core wire of the wire, and the insulation barrel is coupled by surrounding the insulation layer of the wire.

Each pair of the wire barrel and the insulation barrel constituting the barrel part are formed to extend in approximately the same direction so as to face each other, the wire barrel is compressed by surrounding the core wire of the wire, and the insulation barrel is compressed by surrounding the insulation of the wire. .

At this time, the pair of wire barrels are bent toward the other side while facing each other to surround the wire. The pair of insulation barrels are also bent toward each other while facing each other to wrap around the insulation.

That is, when viewed on the basis of the wire, one side of the wire barrel surrounds the wire in a clockwise direction and the other side surrounds the wire in a counterclockwise direction. One side of the insulation barrel also surrounds the wire in a clockwise direction and the other side surrounds the insulation of the wire in a counterclockwise direction.

In the process of coupling the barrel part to the wire in this way, the compression force mainly acts on the wire in the vertical direction, so that the barrel part is at a relatively lower position than the body part or the coupling part. In other words, the center line of the barrel part is different from the center line of the body part or the coupling part. That is, the center line of the barrel part is at a lower position than the center line of the body part or the coupling part.

Therefore, the barrel part is at a relatively lower position than the coupling part with respect to the body part as a whole. When the terminal is created in this way, a problem arises in that the remaining part of the terminal moves up and down based on the barrel part.

Korean Patent Publication No. 10-2010-0118437 Japanese Unexamined Patent Publication No. 55-077368 Japanese Patent Laid-Open No. 7-85901

An object of the present invention is to make the direction in which the wire barrel and the insulation barrel are compressed to the wire are opposite to each other.

An object of the present invention is to ensure that a pair of wire barrels are compressed in the same direction with respect to the wire to surround the core wire of the wire.

An object of the present invention is to enclose the insulation so that the pair of insulation barrels are compressed in the same direction with respect to the wire.

The terminal of the present invention for achieving the above object is a body portion, a coupling portion extending from one side of the body portion and coupled to the other terminal, and a barrel extending from the other side of the body portion and coupled to the wire core and insulation. The barrel portion may include a first barrel body and a second barrel body extending side by side from the body portion, a first wire barrel extending in one direction from the first barrel body and surrounding the core wire, A first insulation barrel extending from the first barrel body in a direction opposite to the extending direction of the first wire barrel and surrounding the insulation, and extending from the second barrel body in a direction opposite to the first wire barrel and extending from the second barrel body to the core wire It may include a second wire barrel surrounding and surrounding, and a second insulation barrel extending in a direction opposite to the extension direction of the first insulation barrel in the second barrel body and surrounding the insulation.

The first barrel body and the second barrel body may be formed so that each one side surface faces each other.

The first barrel body and the second barrel body may be disposed to face the side of the wire.

When the barrel part is compressed by surrounding the wire, the first wire barrel and the first insulation barrel may have free ends in close contact with the outer surface of the second barrel body, and the second wire barrel and the second insulation barrel may be 1 The free end can be closely attached to the outer surface of the barrel body.

At least a portion of the first wire barrel and the second wire barrel may overlap, and at least a portion of the first insulation barrel and the second insulation barrel may overlap.

The first wire barrel and the second wire barrel may wrap around the core wire of the wire in a shifted manner.

The first insulation barrel and the second insulation barrel may wrap around the insulation of the wire in a shifted manner.

Lengths of the first insulation barrel and the second insulation barrel may be longer than the lengths of the first wire barrel and the second wire barrel.

Widths of the first wire barrel and the second wire barrel may be greater than those of the first insulation barrel and the second insulation barrel.

According to another feature of the present invention, the present invention provides a body portion, a coupling portion extending from one side of the body portion and coupled to the opposite terminal, and extending from the other side of the body portion in the opposite direction of the coupling portion to a wire core and insulation It may include a coupled barrel portion, wherein the barrel portion extends in one direction from one side of the width direction of the first barrel body and the second barrel body and the first barrel body extending side by side from the body portion, the first barrel body and the core wire and the second barrel body A first wire barrel surrounding the second barrel body, and a first insulation barrel extending in a direction opposite to the extending direction of the first wire barrel from one side in the width direction of the first barrel body and surrounding the insulation and the second barrel body. And, a second wire barrel extending in a direction opposite to the first wire barrel from one side in the width direction of the second barrel body and surrounding the core wire and the first barrel body, and the first insulation barrel in the second barrel body It may include a second insulation barrel extending in the direction opposite to the extension direction of and surrounding the insulation and the first barrel body.

The first barrel body and the second barrel body have a rectangular plate shape, so that their inner surfaces face each other.

The longitudinal central axes of the first barrel body and the second barrel body may be located on the same plane as the central axis of the body part and the central axis of the coupling part.

The lengths of the first insulation barrel and the second insulation barrel may be longer than the lengths of the first wire barrel and the second wire barrel, and the widths of the first wire barrel and the second wire barrel may be greater than that of the first insulation barrel. 2It can be formed larger than the width of the insulation barrel.

The first barrel body and the second barrel body may be disposed to face the side of the wire.

When the barrel part is compressed by surrounding the wire, the first wire barrel and the first insulation barrel may have free ends in close contact with the outer surface of the second barrel body, and the second wire barrel and the second insulation barrel may be 1 The free end can be closely attached to the outer surface of the barrel body.

The terminal according to the present invention may have at least one or more of the following effects.

In the present invention, the barrel part of the terminal may extend side by side so that the first barrel body and the first barrel body face each other, and the first wire barrel extends in one direction from the first barrel body and the first insulation barrel extends in the opposite direction. The second wire barrel may extend from the second barrel body opposite to the extending direction of the first wire barrel, and the second insulation barrel may extend in the opposite direction to the first insulation barrel.

When the barrel part configured as described above is pressed to the wire using the upper and lower molds of the mold, the first wire barrel and the second wire barrel may be bent in the same direction and pressed to the wire, and the first insulation barrel and the second wire barrel may be bent in the same direction and pressed to the wire. 2 The insulation barrel may be bent in the opposite direction to the first and second wire barrels and pressed to the wire. Based on the wire, since the wire barrel and the insulation barrel are bent in opposite directions and compressed to the wire, the barrel portion is biased to one side so that it is not compressed to the wire. Therefore, the wire may be balanced and coupled to the barrel part.

And, in the present invention, the first wire barrel and the second wire barrel are bent in the same direction with respect to the wire, so that the ends are in close contact with the second barrel body and the first barrel body, and the first insulation barrel and the second insulation barrel are wire It is bent in the same direction based on but in the opposite direction to the bending direction of the first wire barrel and the second wire barrel, so that the tips are in close contact with the second barrel body and the first barrel body. In this way, since the wire barrel and the insulation barrel are compressed between the first barrel body and the second barrel body, the force for finally compressing the barrel part is applied to the outer surfaces of the first barrel body and the second barrel body. As described above, in the present invention, since the force of the mold does not act in the vertical direction with respect to the wire, and the pressing force finally acts in the direction of both sides of the wire, the central axis of the wire does not move in the vertical direction from the original state. Therefore, there is an effect that the central axes of the body portion, the coupling portion, and the barrel portion coincide.

1 is a perspective view showing the configuration of a terminal of a preferred embodiment according to the present invention.
Figure 2 is a perspective view showing a state in which the barrel portion is compressed in a preferred embodiment of the present invention.
Figure 3 is a cross-sectional perspective view showing a state in which the barrel part is compressed from the body part side in a preferred embodiment of the present invention.
Figure 4 is a perspective view showing a state in which the barrel portion is pressed to the wire in an embodiment of the present invention.
Figure 5 is a 5-5 'line cross-sectional view of Figure 4 in a state in which the barrel portion is pressed to the wire in an embodiment of the present invention.
Figure 6 is a cross-sectional view along the line 6-6 'of Figure 4 in a state in which the wire barrel is compressed to the wire in an embodiment of the present invention.
Figure 7 is a 7-7 'line cross-sectional view of Figure 4 in a state in which the insulation barrel is compressed to the wire in the embodiment of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function hinders understanding of the embodiment of the present invention, the detailed description will be omitted.

Also, terms such as first, second, A, B, (a), and (b) may be used in describing components of an embodiment of the present invention. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element may be directly connected or connected to the other element, but there may be another element between the elements. It should be understood that may be "connected", "coupled" or "connected".

Hereinafter, the configuration of a terminal of a preferred embodiment of the present invention will be described with reference to the accompanying drawings.

The terminal 10 of this embodiment may be made of a conductive material. The terminal 10 may be made of a conductive metal material. The terminal 10 may be produced by continuous operation while passing a metal plate through a progressive mold. In the drawings of this embodiment, the male terminal is described as an example, but this is not necessarily the case and the present invention can also be applied to the female terminal.

The terminal 10 may have a body portion 12 . The body portion 12 may form a middle portion of the terminal 10 . The body portion 12, the coupling portion 14 and the barrel portion 20 to be described below are integrally divided into regions, so it is not clear. The coupling part 14 integrally protrudes from one end of the body part 12, and the barrel part 20 integrally protrudes from the other end of the body part 12.

In this embodiment, the coupling portion 14 is tab-shaped, but in the case of a female terminal, the coupling portion 14 may be configured in a box shape open in front and rear. A lance hanging hole 16 may be formed in the body portion 12 . A lance (not shown) in a housing (not shown) may be hung on the lance hanging hole 16 . A stabilizer 18 may protrude from one side of the body 12 . The stabilizer 18 may guide the direction in which the terminal 10 is inserted into the terminal seating space of the housing.

The barrel part 20 may integrally protrude from one side of the body part 12 . In this embodiment, the barrel part 20 protrudes in the opposite direction on the opposite side of the coupling part 14 . Therefore, in this embodiment, the body part 12, the coupling part 14 and the barrel part 20 are disposed on a straight line.

The barrel part 20 may have a first barrel body 22 and a second barrel body 22'. The first barrel body 22 and the second barrel body 22' may each extend side by side in a rectangular plate shape or a plate shape having an arc shape in cross section. The first barrel body 22 and the second barrel body 22' may extend side by side with one surface facing each other. The central axis of the longitudinal direction of the first barrel body 22 and the second barrel body 22' may be on the same plane as the central axis of the body part 12 and the central axis of the coupling part 14.

The first barrel body 22 may include a first wire barrel 24 and a first insulation barrel 26 extending in different directions. At least a portion of the first wire barrel 24 and the first insulation barrel 26 may be rectangular or trapezoidal. The first wire barrel 24 may have a greater width than the first insulation barrel 26 . The first insulation barrel 26 may be longer than the first wire barrel 24 .

In the illustrated embodiment, based on FIG. 1, the first wire barrel 24 may extend obliquely downward from the first barrel body 22, and the first insulation barrel 26 may extend obliquely upward. there is. The first wire barrel 24 and the first insulation barrel 26 may extend in opposite directions from both sides in the width direction of the first barrel body 22 .

The second wire barrel 24' and the second insulation barrel 26' may extend in different directions from the second barrel body 22'. At least a portion of the second wire barrel 24' and the second insulation barrel 26' may be rectangular or trapezoidal. The second wire barrel 24' may have a wider width than the second insulation barrel 26'. The second insulation barrel 36' may be longer than the second wire barrel 24'. In the illustrated embodiment, based on FIG. 1 , the second wire barrel 24' may extend obliquely upward, and the second insulation barrel 26' may extend obliquely downward. The second wire barrel 24' and the second insulation barrel 26' may extend in opposite directions from both sides in the width direction of the second barrel body 22'.

When the lengths of the first and second wire barrels 24.24' wrap around the wire 30 and are compressed, the ends can be in close contact with the outer surfaces of the first barrel body 22 and the second barrel body 22'. can be of any length. When the length of the first and second insulation barrels 26.26' wraps around the wire 30 and is compressed, the ends can be in close contact with the outer surfaces of the first barrel body 22 and the second barrel body 22'. can be of any length. In other words, the free ends of the first wire barrel 24 and the first insulation barrel 26 may be in close contact with the outer surface of the second barrel body 22', and the second wire barrel 24' The free end of the second insulation barrel 26' may be in close contact with the outer surface of the first barrel body 22.

In the present invention, the first wire barrel 24 and the second wire barrel 24' may extend in opposite directions. The first insulation barrel 26 and the second insulation barrel 26' may also extend in opposite directions. Here, the opposite direction is based on the first barrel body 22 and the second barrel body 22 '. The opposite direction is not necessarily the opposite direction on a straight line, and may have a certain degree of inclination.

In the illustrated embodiment, the first wire barrel 24 and the first insulation barrel 26 extend in opposite directions from the first barrel body 22 . However, the first wire barrel 24 and the first insulation barrel 26 may each extend in both directions based on the first barrel body 22 . Of course, at this time, the first wire barrel 24 or the first insulation barrel 26 does not extend the same length in both directions, but mainly extends in one direction and may extend in the other direction by a very small length compared to one direction. . This configuration is the same for the second wire barrel 24' and the second insulation barrel 26'.

2 and 3, the first wire barrel 24, the second wire barrel 24', the first insulation barrel 26 and the second insulation barrel 26' are compressed by surrounding the wire 30. state is shown.

The first wire barrel 24 and the second wire barrel 24' may be bent to surround the wire 30 in the same direction based on the wire 30. In the illustrated embodiment, as shown in FIG. 6, the first wire barrel 24 and the second wire barrel 24' may surround the wire 30 in a counterclockwise direction.

The first insulation barrel 26 and the second insulation barrel 26' surround the wire 30 in a direction opposite to the direction in which the first wire barrel 24 and the second wire barrel 24' are wrapped around. It can be bent to wrap. In the illustrated embodiment, as shown in FIG. 7, the first insulation barrel 26 and the second insulation barrel 26' may surround the wire 30 in a clockwise direction.

In the illustrated embodiment, the first wire barrel 24 and the second wire barrel 24' are compressed by surrounding the core wire 32 of the wire 30 so as to overlap each other, but this is not necessarily the case. For example, the first wire barrel 24 and the second wire barrel 24' so that the first wire barrel 24 and the second wire barrel 24' surround the core wire 32 of the wire 30, respectively. may be at odds with each other. Alternatively, the first wire barrel 24 and the second wire barrel 24' may be overlapped in part and shifted in part.

This is the same for the first insulation barrel 26 and the second insulation barrel 26'. In the illustrated embodiment, the first insulation barrel 26 and the second insulation barrel 26' are compressed by surrounding the insulation 34 of the wire 30 so as to overlap each other, but this is not necessarily the case. For example, the first insulation barrel 26 and the second insulation barrel 26' so that the first insulation barrel 26 and the second insulation barrel 26' surround the insulation 34 of the wire 30, respectively. may be at odds with each other. Alternatively, the first insulation barrel 26 and the second insulation barrel 26' may be partially overlapped and partially misaligned.

Hereinafter, it will be described that the barrel part is compressed in the terminal of the preferred embodiment of the present invention having the configuration as described above.

In the terminal 10 of the present invention, when the barrel part 20 surrounds and compresses the wire 30, the upper and lower molds of the mold move relative to the wire 30 in the vertical direction, but finally the wire The inner surfaces of the upper and lower molds of the mold act on the barrel part 20 in both directions of (30), so that the first wire barrel 24, the second wire barrel 24', and the first insulation barrel 26 ) And the second insulation barrel 26 'can be compressed to the wire 30, including the first barrel body 22 or the second barrel body 22'.

In this way, by applying a crimping force to both sides of the wire 30 based on the wire 30, the center line of the barrel part 20 does not change and coincides with the center line of the body part 12 and the coupling part 14 there will be

In the present invention, in pressing the barrel part 20 to the wire 30 with the upper and lower molds of the mold, as shown in FIG. 1, the first wire barrel 24 and the second wire barrel 24' are mutually connected to each other. Since it extends in the opposite direction, the first wire barrel 24 may be guided by an inner surface of one side of the lower mold and bent in a counterclockwise direction (arrow A direction in FIG. 6) with respect to the wire 30. The second wire barrel 24' may be guided by the inner surface of the other side of the top mold and bent in a counterclockwise direction (in the direction of arrow B in FIG. 6) with respect to the wire 30.

By this operation, the first wire barrel 24 and the second wire barrel 24' can be compressed by wrapping around the core wire 32 of the wire 30 as shown in FIG. 6 . That is, as shown in FIG. 6, the first wire barrel 24 may be partially pressed against the outer surface of the second barrel body 22' while surrounding the core wire 32. The second wire barrel 24 ′ may be compressed by surrounding parts of the first barrel body 22 and the first wire barrel 24 while surrounding the core wire 32 .

Meanwhile, as shown in FIG. 7 , the first insulation barrel 26 and the second insulation barrel 26' may be wrapped around the insulation 34 of the wire 30 and compressed. That is, while the first insulation barrel 26 and the second insulation barrel 26' extend in opposite directions to each other, the second insulation barrel 26' extends from the lower portion of the second barrel body 22' (Fig. 1 standard), and the first insulation barrel 26 extends upward from the first barrel body 22. Accordingly, the first insulation barrel 26 may be bent in a clockwise direction (in the direction of arrow C in FIG. 7 ) with respect to the wire 30 while being guided by the inner surface of one side of the upper mold. The second insulation barrel 26' may be guided by the inner surface of the other side of the lower mold and bent in a clockwise direction (direction of arrow D in FIG. 7) with respect to the wire 30.

As shown in FIG. 7 , the first insulation barrel 26 and the second insulation barrel 26 ′ may be compressed by wrapping around the insulation 34 of the wire 30 by such an operation. That is, as shown in FIG. 7 , the first insulation barrel 26 may be partially pressed against the outer surface of the second barrel body 22 ′ while surrounding the insulation 34 . The second insulation barrel 26' may be partially pressed against the outer surface of the first barrel body 22 while surrounding the outer surface of the insulation 34.

A state in which the wire 30 and the barrel part 20 are coupled in this way is well shown in FIG. 4 . In this way, the terminal 10 where the crimping of the wire 30 is completed may be inserted and installed into the terminal seating space of the housing. At this time, the central axis of the body part 12, the coupling part 14, and the barrel part 20 of the terminal 10 coincide, so that they can be stably installed in the terminal seating space.

In the above, even though all the components constituting the embodiment according to the present invention have been described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the components may be selectively combined with one or more to operate. In addition, terms such as "comprise", "comprise" or "having" described above mean that the corresponding component may be present unless otherwise stated, and thus exclude other components. It should be construed as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs, unless defined otherwise. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and unless explicitly defined in the present invention, they are not interpreted in an ideal or excessively formal meaning.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

10: terminal 12: body part
14: coupling part 16: lance hanger
18: stabilizer 20: barrel part
22: first barrel body 22 ': second barrel body
24: first wire barrel 24 ': second wire barrel
26: first insulation barrel 26 ': second insulation barrel
30: wire 32: core wire
34: Insulation

Claims (15)

body part,
A coupling portion extending from one side of the body portion and coupled to the counterpart terminal;
A barrel portion extending from the other side of the body portion and coupled to the core wire and insulation of the wire,
The barrel part,
A first barrel body and a second barrel body extending side by side from the body;
A first wire barrel extending in one direction from the first barrel body and surrounding the core wire;
A first insulation barrel extending in a direction opposite to the extension direction of the first wire barrel from the first barrel body and surrounding the insulation;
A second wire barrel extending from the second barrel body in a direction opposite to the first wire barrel and surrounding the core wire;
A terminal including a second insulation barrel extending in a direction opposite to the extension direction of the first insulation barrel from the second barrel body and surrounding the insulation.
The terminal according to claim 1, wherein surfaces of the first barrel body and the second barrel body face each other.
The terminal according to claim 2, wherein the first barrel body and the second barrel body are disposed to face the side surfaces of the wire.
The method of claim 3, wherein when the barrel part is compressed by surrounding the wire, the free end of the first wire barrel and the first insulation barrel can be in close contact with the outer surface of the second barrel body, and the second wire barrel and The second insulation barrel is a terminal whose free end is in close contact with the outer surface of the first barrel body.
The terminal according to claim 4, wherein at least a portion of the first wire barrel and the second wire barrel overlap, and at least a portion of the first insulation barrel and the second insulation barrel overlap.
The terminal according to claim 4, wherein the first wire barrel and the second wire barrel wrap around the core wire of the wire in a shifted manner.
The terminal according to claim 6, wherein the first insulation barrel and the second insulation barrel surround the insulation of the wire in a shifted manner.
The terminal according to any one of claims 1 to 7, wherein lengths of the first insulation barrel and the second insulation barrel extend longer than lengths of the first wire barrel and the second wire barrel.
The terminal according to claim 8, wherein widths of the first wire barrel and the second wire barrel are larger than those of the first insulation barrel and the second insulation barrel.
body part,
A coupling portion extending from one side of the body portion and coupled to the counterpart terminal;
A barrel portion extending from the other side of the body portion in the opposite direction of the coupling portion and coupled to the core wire and insulation of the wire,
The barrel part,
A first barrel body and a second barrel body extending side by side from the body;
A first wire barrel extending in one direction from one side of the first barrel body in the width direction and surrounding the core wire and the second barrel body;
A first insulation barrel extending in a direction opposite to the extension direction of the first wire barrel from one side in the width direction of the first barrel body and surrounding the insulation and the second barrel body;
A second wire barrel extending in a direction opposite to the first wire barrel from one side in the width direction of the second barrel body and surrounding the core wire and the first barrel body;
A terminal including a second insulation barrel extending in a direction opposite to the extension direction of the first insulation barrel from the second barrel body and surrounding the insulation and the first barrel body.
11. The terminal according to claim 10, wherein the first barrel body and the second barrel body have a rectangular plate shape, and their inner surfaces face each other.
The terminal according to claim 11, wherein central axes in the longitudinal direction of the first barrel body and the second barrel body are located on the same plane as the central axis of the body part and the central axis of the coupling part.
13. The method of claim 12, wherein the lengths of the first insulation barrel and the second insulation barrel are longer than the lengths of the first wire barrel and the second wire barrel, and the widths of the first wire barrel and the second wire barrel are the first and second wire barrels. A terminal formed larger than the width of the insulation barrel and the second insulation barrel.
The terminal according to any one of claims 10 to 13, wherein the first barrel body and the second barrel body are disposed to face the side surfaces of the wire.
15. The method of claim 14, wherein when the barrel part is compressed by surrounding the wire, the free end of the first wire barrel and the first insulation barrel can be in close contact with the outer surface of the second barrel body, and the second wire barrel and The second insulation barrel is a terminal whose free end is in close contact with the outer surface of the first barrel body.

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