Joint debugging mechanism of car lamp module

Abstract

The utility model discloses a joint debugging mechanism of a car lamp module, the car lamp module comprises a shell, a joint debugging support, a first module support and a second module support, the joint debugging support is hinged on the shell through a first ball screw; the first module support is connected to one end of the joint debugging support through a first connecting rod, one end of the first connecting rod is hinged to the first module support, the other end of the first connecting rod is hinged to the joint debugging support, and the first module support is rotationally connected to the shell around the first support arm; the second module support is connected to the other end of the joint debugging support through a second connecting rod, one end of the second connecting rod is hinged to the second module support, the other end of the second connecting rod is hinged to the joint debugging support, and the second module support is rotationally connected to the shell around a second support arm; the first connecting rod and the second connecting rod are arranged on the two sides of the first ball screw respectively. According to the joint debugging mechanism of the car lamp module, the movement envelope occupies a small space, the structure is simple, and the structural stability is good.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of automobile lamps, especially relates to a joint debugging mechanism of car lamp module. BACKGROUND

[0002] High beam and low beam module is one of the key components of automobile lighting, and has a very important influence on the night driving safety of drivers. At present, in the automobile lighting lamps using high beam and low beam module, including integrated and split high beam and low beam module, the light type needs to be adjusted synchronously when the split high beam and low beam module is adjusted, so as to ensure the consistency of the adjustment, therefore, a synchronous adjustment structure of high beam and low beam module needs to be provided.

[0003] In the prior art, for the placement of high beam and low beam modules at a long distance, two modules share one large bracket, for the placement of two modules at a long distance, the motion envelope of this structure occupies a large space, has a great challenge to the modeling, and the adjustment cantilever is too long, so that the stability of the whole system is poor. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides a joint debugging mechanism of car lamp module, which has a small motion envelope space, a simple structure and good structural stability.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0006] A joint debugging mechanism of car lamp module, the car lamp module includes a shell, comprising:

[0007] A joint debugging bracket is hinged to the shell by a first ball head screw;

[0008] A first module bracket is connected to one end of the joint debugging bracket by a first connecting rod, one end of the first connecting rod is hinged to the first module bracket, the other end of the first connecting rod is hinged to the joint debugging bracket, and the first module bracket is rotatably connected to the shell around a first bracket arm;

[0009] A second module bracket is connected to the other end of the joint debugging bracket by a second connecting rod, one end of the second connecting rod is hinged to the second module bracket, the other end of the second connecting rod is hinged to the joint debugging bracket, and the second module bracket is rotatably connected to the shell around a second bracket arm;

[0010] The first connecting rod and the second connecting rod are arranged on the two sides of the first ball head screw;

[0011] The joint debugging bracket drives the first module bracket and the second module bracket to rotate up and down around the first ball head screw as the rotation center.

[0012] Optionally, a first guide slot is arranged on the shell, and two ends of the joint debugging support are slidingly connected in the first guide slot, and the first guide slot limits rotation of the joint debugging support in a plane perpendicular to the shell.

[0013] Optionally, the joint debugging mechanism further comprises a linear driving device, and the joint debugging support is hingedly connected to the linear driving device through a third connecting rod.

[0014] One end of the third connecting rod is hingedly connected to the joint debugging support, and the other end is connected to a power output end of the linear driving device.

[0015] The third connecting rod is arranged in parallel with the second connecting rod or the first connecting rod.

[0016] Optionally, the first connecting rod is spaced apart from the first ball head screw by a first distance, the second connecting rod is spaced apart from the first ball head screw by a second distance, and the first distance is equal to the second distance.

[0017] Optionally, the first connecting rod is spaced apart from the first arm by a third distance, the second connecting rod is spaced apart from the second arm by a fourth distance, the third distance is equal to the fourth distance, and the first distance is equal to the third distance.

[0018] Optionally, the third connecting rod is coaxially arranged with the first connecting rod.

[0019] Optionally, one end of the first arm is hingedly connected to the shell through a first connecting piece, and the other end is hingedly connected to the shell through a second connecting piece.

[0020] One end of the second arm is hingedly connected to the shell through a third connecting piece, and the other end is hingedly connected to the shell through a fourth connecting piece.

[0021] Optionally, the first connecting piece is a second ball head screw, the second connecting piece is a third ball head screw, the third connecting piece is a fourth ball head screw, and the fourth connecting piece is a fifth ball head screw.

[0022] Optionally, the first module support is a rectangular frame, the first connecting rod is connected to a first corner point of the first module support, the second ball head screw is connected to a second corner point of the first module support, and the third ball head screw is connected to a third corner point of the first module support.

[0023] The second module support is a rectangular frame, the second connecting rod is connected to a first corner point of the second module support, the fourth ball head screw is connected to a second corner point of the second module support, and the fifth ball head screw is connected to a third corner point of the second module support.

[0024] Optionally, the second connecting rod has a length greater than that of the first connecting rod.

[0025] From the above technical solutions can be seen, the utility model provides a car lamp module's joint debugging mechanism, through with the shell hinge joint debugging support, joint debugging support passes through first connecting rod and first module support hinge joint, joint debugging support passes through second connecting rod and second module support hinge joint, simultaneously, first module support rotates around first arm, second module support rotates around second arm. First connecting rod moves downward, drives first module support to rotate clockwise around first arm, realizes first module rotates downward, the light of first module deflection right side. Simultaneously, joint debugging support promotes second connecting rod to move upward, drives second module support to rotate clockwise around second arm, thereby realizes second module rotates upward, the light of second module deflection right side, thereby realizes the light type of first module and second module deflection right side's same direction rotation. First connecting rod moves upward, drives first module support to rotate counterclockwise around first arm, thereby realizes first module rotates upward, the light of first module deflection left side;Simultaneously, joint debugging support promotes second connecting rod to move downward, drives second module support to rotate counterclockwise around second arm, thereby realizes second module rotates downward, the light of second module deflection left side, thereby realizes the light type of first module and second module deflection left side's same direction rotation. The utility model discloses a car lamp module's joint debugging mechanism, realized two module's light type's synchronous adjustment, first connecting rod or second connecting rod in drive process movement envelope occupies small space, simple structure, the length of the cantilever structure of adjustment is short, and structural stability is good. BRIEF DESCRIPTION OF DRAWINGS

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, without creative labor, other drawings can also be obtained according to these drawings.

[0027] Figure 1 The structure diagram of the joint debugging mechanism of the car lamp module is provided from another angle for the embodiment of the utility model;

[0028] Figure 2 The structure diagram of the joint debugging mechanism of the car lamp module is provided from another angle for the embodiment of the utility model;

[0029] Figure 3 The structure diagram of the joint debugging mechanism of the car lamp module is provided from another angle for the embodiment of the utility model;

[0030] Figure 4The explosion structure schematic view of the joint debugging mechanism of the vehicle lamp module is provided for the embodiment of the utility model;

[0031] Figure 5 The simplified schematic view of the joint debugging mechanism of the vehicle lamp module is provided for the embodiment of the utility model;

[0032] Figure 6 For Figure 5 The rotating schematic view of the mechanism in the among after the downward pulling force of the motor;

[0033] Figure 7 The structure schematic view of the joint debugging support is provided for the embodiment of the utility model;

[0034] Figure 8 The connection structure schematic view of the joint debugging support and the first ball head screw is provided for the embodiment of the utility model;

[0035] Figure 9 The structure schematic view of the first ball head screw is provided for the embodiment of the utility model;

[0036] Figure 10 The structure schematic view of the joint debugging support connected on the shell is provided for the embodiment of the utility model.

[0037] Among them:

[0038] 1, first module support,

[0039] 101, first frame arm, 102, first connecting piece, 103, second connecting piece,

[0040] 2, first module,

[0041] 3, first rotating shaft,

[0042] 4, first connecting rod,

[0043] 5, joint debugging support,

[0044] 501, first connecting barrel, 502, second connecting barrel, 503, third connecting barrel,

[0045] 6, first ball head screw,

[0046] 7, second connecting rod,

[0047] 8, second module support,

[0048] 801, second frame arm, 802, third connecting piece, 803, fourth connecting piece,

[0049] 9, second module,

[0050] 10, second rotating shaft,

[0051] 11、 motor,

[0052] 12、 vertical adjustment structure,

[0053] 13、 horizontal adjustment structure,

[0054] 14、 third connecting rod,

[0055] 15、 motor support,

[0056] 16、 housing,

[0057] 1601、 first guide groove. DETAILED DESCRIPTION

[0058] The utility model discloses a kind of joint debugging mechanism of car lamp module, motion envelope occupies small space, simple structure, and structure stability is good.

[0059] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the utility model.

[0060] Referring to Figures 1 to 10 The joint debugging mechanism of the car lamp module of the utility model, the car lamp module includes a housing 16, and the joint debugging mechanism includes a joint debugging support 5, a first module support 1 and a second module support 8. The joint debugging support 5 is hingedly connected to the housing 16 through a first ball head screw 6. The first module support 1 is connected to the joint debugging support 5 through a first connecting rod 4, one end of the first connecting rod 4 is hingedly connected to the first module support 1, the other end of the first connecting rod 4 is hingedly connected to the joint debugging support 5, and the first module support 1 is rotationally connected to the housing 16 around a first arm 101. A first module 2 is installed on the first module support 1. The second module support 8 is connected to the joint debugging support 5 through a second connecting rod 7, one end of the second connecting rod 7 is hingedly connected to the second module support 8, the other end of the second connecting rod 7 is hingedly connected to the joint debugging support 5, and the second module support 8 is rotationally connected to the housing 16 around a second arm 801. A second module 9 is installed on the second module support 8. The first connecting rod 4 and the second connecting rod 7 are separately arranged on the two sides of the first ball head screw 6. The joint debugging support 5 drives the first module support 1 and the second module support 8 to rotate up and down around the first ball head screw 6 as the rotation center.

[0061] Among them, the first connecting rod 4 and the second connecting rod 7 are arranged perpendicularly to the housing 16, and the housing 16 is used for installing the car lamp module.

[0062] The adjustment mechanism of this utility model for a vehicle headlight module involves hinged adjustment bracket 5 to the housing. Adjustment bracket 5 is hinged to first module bracket 1 via a first connecting rod 4, and to second module bracket 8 via a second connecting rod 7. Simultaneously, first module bracket 1 rotates around first arm 101, and second module bracket 8 rotates around second arm 801. When the first connecting rod 4 moves downward, it causes first module bracket 1 to rotate clockwise around first arm 101, resulting in downward rotation of first module 2 and deflection of the light emitted from first module 2 to the right. Simultaneously, adjustment bracket 5 pushes second connecting rod 7 upward, causing second module bracket 8 to rotate clockwise around second arm 801, resulting in upward rotation of second module 9 and deflection of the light emitted from second module 9 to the right. Therefore, the light patterns emitted by first module 2 and second module 9 rotate in the same direction to the right. The first connecting rod 4 moves upward, causing the first module bracket 1 to rotate counterclockwise around the first arm 101, thereby causing the first module 2 to rotate upward and the light emitted from the first module 2 to deflect to the left. Simultaneously, the coupling bracket 5 pushes the second connecting rod 7 downward, causing the second module bracket 8 to rotate counterclockwise around the second arm 801, thereby causing the second module 9 to rotate downward and the light emitted from the second module 9 to deflect to the left. This achieves the same leftward rotation of the light patterns emitted by the first module 2 and the second module 9. Here, "left" and "right" are relative to... Figure 6 In this invention, the joint adjustment mechanism of the vehicle headlight module enables synchronous adjustment of the light patterns of the two modules. The first connecting rod 4 or the second connecting rod 7 has a small space occupied by its motion envelope during the driving process, a simple structure, a short length of the adjustable cantilever structure, and good structural stability.

[0063] To limit the rotation direction of the joint debugging bracket 5, a first guide groove 1061 is provided on the housing 16, such as... Figure 10 As shown, both ends of the joint adjustment bracket 5 are slidably connected to a first guide groove 1061 on the housing 16. The guiding direction of the first guide groove 1061 is perpendicular to the housing 16, so that the joint adjustment bracket 5 can only rotate around the first ball head screw 6 in the plane perpendicular to the housing 16 without shaking. The cross-section of the first guide groove 1061 is C-shaped.

[0064] In order to realize the electric drive of the jointing support 5, the jointing mechanism further comprises a linear drive device, and the jointing support 5 is hinged to the linear drive device through a third connecting rod 14. One end of the third connecting rod 14 is hinged to the jointing support 5, and the other end is connected to the power output end of the linear drive device. The third connecting rod 14 is arranged in parallel with the second connecting rod 7 or the first connecting rod 4. In an embodiment, the linear drive device is a motor 11. The motor 11 is fixedly connected to a motor support 15, and the motor support 15 is slidingly connected to a second guide groove on the shell 16. The guide direction of the second guide groove is perpendicular to the shell 16. The height of the motor support 15 is adjusted by a vertical adjustment structure 12, so as to change the installation height of the motor support 15 on the shell 16. The vertical adjustment structure 12 is installed on the shell 16, and is a common transmission structure in the prior art, such as a worm gear structure, which will not be described here.

[0065] In an embodiment, the first connecting rod 4 is spaced apart from the first ball head screw 6 by a first distance d1, and the second connecting rod 7 is spaced apart from the first ball head screw 6 by a second distance d2. The first distance d1 is equal to the second distance d2, so that the moving distances of the first connecting rod 4 and the second connecting rod 7 are the same when the jointing support 5 rotates around the first ball head screw 6. In order to realize the rotation angle synchronization of the first module support 1 and the second module support 8, so as to realize the rotation angle synchronization of the first module 2 and the second module 9, the first connecting rod 4 is spaced apart from the first arm 101 by a third distance d3, and the second connecting rod 7 is spaced apart from the second arm 801 by a fourth distance d4. The third distance d3 is equal to the fourth distance d4, and the first distance d1 is equal to the third distance d3, that is, d1 = d2 = d3 = d4. The length of the second connecting rod 7 is greater than the length of the first connecting rod 4, and the second connecting rod 7 is a long rod. In order to improve the structural strength of the second connecting rod 7, a structural reinforcing rib plate is arranged on the second connecting rod 7.

[0066] Preferably, the third connecting rod 14 is coaxially arranged with the first connecting rod 4, so that the moving distance of the third connecting rod 14 is the same as that of the first connecting rod 4, and the moving distance of the first connecting rod 4 can be obtained without calculation, which is convenient to use. In other embodiments, the third connecting rod 14 can also have a small included angle with the first connecting rod 4.

[0067] Specifically, one end of the first arm 101 is hinged to the housing 16 through a first connecting member 102, and the other end is hinged to the housing 16 through a second connecting member 103, so that the connecting line of the first connecting member 102 and the second connecting member 103 forms a first rotation shaft 3. The first connecting rod 4 is not intersected with the first rotation shaft 3, so that the first connecting rod 4 can push the first module support 1 to rotate around the first rotation shaft 3. In an embodiment, the first connecting member 102 is a second ball head screw, and the second connecting member 103 is a third ball head screw. The threaded ends of the second ball head screw and the third ball head screw are connected to the housing 16, and the ball head ends are rotationally connected to the first arm 101. One end of the second arm 801 is hinged to the housing 16 through a third connecting member 802, and the other end is hinged to the housing 16 through a fourth connecting member 803, so that the connecting line of the third connecting member 802 and the fourth connecting member 803 forms a second rotation shaft 10. The second connecting rod 7 is not intersected with the second rotation shaft 10, so that the second connecting rod 7 can push the second module support 8 to rotate around the second rotation shaft 10. In an embodiment, the third connecting member 802 is a fourth ball head screw, and the fourth connecting member 803 is a fifth ball head screw. The threaded ends of the fourth ball head screw and the fifth ball head screw are connected to the housing 16, and the ball head ends are rotationally connected to the second arm 801. The first rotation shaft 3 and the second rotation shaft 10 are arranged in parallel.

[0068] In a specific embodiment, the first module support 1 is a rectangular frame, the first connecting rod 4 is connected to the first corner point of the first module support 1, the second ball head screw is connected to the second corner point of the first module support 1, and the third ball head screw is connected to the third corner point of the first module support 1, as shown in FIG. 1. Figure 1 At the same time, the second module support 8 is also a rectangular frame, the second connecting rod 7 is connected to the first corner point of the second module support 8, the fourth ball head screw is connected to the second corner point of the second module support 8, and the fifth ball head screw is connected to the third corner point of the second module support 8, as shown in FIG. 1. Figure 1 The first connecting rod 4 and the second connecting rod 7 are arranged in parallel, and the length of the second connecting rod 7 is greater than the length of the first connecting rod 4. The second module support 8 is provided with a horizontal adjustment structure 13, which is a commonly used horizontal position adjustment structure of a module support in the prior art, and will not be described here.

[0069] In order to facilitate connection with the connecting member, the jointing support 5 is provided with a first connecting barrel 501, a second connecting barrel 502, and a third connecting barrel 503, as shown in FIG. 1. Figure 7 and Figure 8As shown, the first connecting cylinder 501 is fixedly connected with a first ball hinge groove, which is hinged with the ball head of the first ball head screw 6. The second connecting cylinder 502 is fixedly connected with a second ball hinge groove, which is hinged with the first connecting rod 4. The third connecting cylinder 503 is fixedly connected with a third ball hinge groove, which is hinged with the second connecting rod 7. Figure 9 It is a structural schematic view of the first ball head screw 6. The first ball hinge groove, the second ball hinge groove and the third ball hinge groove are all the ball hinge groove structures commonly used in the prior art, which will not be described here.

[0070] The power output end of the motor 11 is retracted, the joint debugging support 5 is rotated counterclockwise around the rotation center, the first connecting rod 4 moves downward, the first module support 1 is rotated clockwise downward around the first rotating shaft 3, the first module 2 is rotated downward, and the light emitted by the first module 2 is deflected to the right side; at the same time, the second connecting rod 7 moves upward, the second module support 8 is rotated clockwise upward around the second rotating shaft 10, so that the second module 9 is rotated upward, and the light emitted by the second module 9 is deflected to the right side, so that the light types emitted by the first module 2 and the second module 9 are rotated to the right side in the same direction. Figure 6 The power output end of the motor 11 is retracted, the joint debugging support 5 is rotated counterclockwise around the rotation center, the first connecting rod 4 moves downward, the first module support 1 is rotated clockwise downward around the first rotating shaft 3, the first module 2 is rotated downward, and the light emitted by the first module 2 is deflected to the right side; at the same time, the second connecting rod 7 moves upward, the second module support 8 is rotated clockwise upward around the second rotating shaft 10, so that the second module 9 is rotated upward, and the light emitted by the second module 9 is deflected to the right side, so that the light types emitted by the first module 2 and the second module 9 are rotated to the right side in the same direction.

[0071] In the description of the present scheme, it should be understood that the terms "upper", "lower", "vertical", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present scheme.

[0072] In addition, the terms "first" and "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present scheme, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0073] The various embodiments described in this specification are presented by way of example, and each embodiment describes a specific implementation of the general principles described herein. The embodiments are not intended to limit or restrict the scope of the disclosure to the embodiments shown. The various embodiments can be implemented in any number of ways, using computer-usable or computer-readable media. Such media can be storage media or a communication medium. Storage media can be any available media that can be accessed by a computer or a machine. By way of example, and not limitation, such computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of computer- readable instructions or data structures and that can be accessed by a computer or machine. Combinations of the above should also be included within the scope of computer-readable media. Computer- readable media also can be any available media that can be accessed by a computer or machine. By way of example, and not limitation, with the computer- readable media, computer program product or computer-readable media can comprise RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of computer- readable instructions or data structures and that can be accessed by a computer or machine. Combinations of the above should also be included within the scope of computer-readable media.

[0074] The above description of disclosed embodiments is meant to be illustrative of the present application and not limiting. Many variations of the disclosed embodiments can become apparent to those skilled in the art in view of the teachings herein. Such variations are considered within the scope of the present application. The scope

Claims

1. A mechanism for joint debugging of a vehicle lamp module, the vehicle lamp module comprising a housing, characterized in that, The utility model relates to a kind of modularization mechanism, including: Jointing support, is articulated to the shell by a first ball head screw; First module support, is connected to one end of the jointing support by a first connecting rod, one end of the first connecting rod is articulated with the first module support, the other end of the first connecting rod is articulated with the jointing support, and the first module support is rotatably connected to the shell around first arm; Second module support, is connected to the other end of the jointing support by a second connecting rod, one end of the second connecting rod is articulated with the second module support, the other end of the second connecting rod is articulated with the jointing support, and the second module support is rotatably connected to the shell around second arm; The first connecting rod and the second connecting rod are separately arranged on the two sides of the first ball head screw; The jointing support drives the first module support and the second module support to rotate up and down with the first ball head screw as the rotation center.

2. The mechanism for joint debugging of the vehicle lamp module according to claim 1, characterized in that, The shell is provided with a first guide slot, and the two ends of the jointing support are each slidably connected in the first guide slot, and the first guide slot limits the rotation of the jointing support in the plane perpendicular to the shell.

3. The joint debugging mechanism of the vehicle lamp module according to claim 1 or 2, characterized in that, The jointing mechanism further comprises a linear drive device, and the jointing support is articulated with the linear drive device through a third connecting rod. One end of the third connecting rod is articulated with the jointing support, and the other end is connected with the power output end of the linear drive device. The third connecting rod is arranged in parallel with the second connecting rod or the first connecting rod.

4. The mechanism for joint debugging of vehicle lamp modules according to claim 1, characterized in that, The first connecting rod is spaced apart from the first ball head screw by a first distance, the second connecting rod is spaced apart from the first ball head screw by a second distance, and the first distance is equal to the second distance.

5. The mechanism for joint debugging of vehicle lamp modules according to claim 4, characterized in that, The first connecting rod is spaced apart from the first arm by a third distance, the second connecting rod is spaced apart from the second arm by a fourth distance, the third distance is equal to the fourth distance, and the first distance is equal to the third distance.

6. The mechanism for joint debugging of vehicle lamp modules according to claim 3, characterized in that, The third connecting rod is coaxially arranged with the first connecting rod.

7. The mechanism for joint debugging of vehicle lamp modules according to claim 1, characterized in that, One end of the first arm is articulated to the shell through a first connecting piece, and the other end is articulated to the shell through a second connecting piece. One end of the second arm is articulated to the shell through a third connecting piece, and the other end is articulated to the shell through a fourth connecting piece.

8. The mechanism for joint debugging of vehicle lamp modules according to claim 7, characterized in that, The first connecting piece is a second ball head screw, the second connecting piece is a third ball head screw, the third connecting piece is a fourth ball head screw, and the fourth connecting piece is a fifth ball head screw.

9. The mechanism for joint debugging of vehicle lamp modules according to claim 8, characterized in that, The first module support is a rectangular frame, the first connecting rod is connected to the first corner point of the first module support, the second ball head screw is connected to the second corner point of the first module support, and the third ball head screw is connected to the third corner point of the first module support. The second module support is a rectangular frame, the second connecting rod is connected to the first corner point of the second module support, the fourth ball head screw is connected to the second corner point of the second module support, and the fifth ball head screw is connected to the third corner point of the second module support.

10. The mechanism for joint debugging of vehicle lamp modules according to claim 1, characterized in that, The length of the second connecting rod is greater than the length of the first connecting rod.

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