Telescopic chassis and work machine

Abstract

The present application relates to the technical field of work machines and provides a telescopic chassis and a work machine, and the telescopic chassis comprises: a pair of main beams, at one end of which an extension beam assembly is arranged; and an intermediate beam arranged between the pair of main beams; wherein the extension beam assembly comprises: a pair of inner extension beams, wherein the pair of inner extension beams are each connected to the corresponding ends of the main beams and the pair of inner extension beams are located on the same side of the intermediate beam; wherein the inner extension beams are switchable between a retracted and an extended state;wherein, in the retracted state, the inner extension beams are perpendicular to the main beams, and the free ends of the pair of inner extension beams are arranged offset in the vertical direction; wherein, in the extended state, the inner extension beams each extend outwardly from the ends of the main beams; and a pair of complementary beams formed to compensate for the height of the free ends of the inner extension beams in the extended state. Based on the original length dimension, the present application adopts a connection method in which the free end of the inner extension beams is offset up and down, thereby increasing the length of the inner extension beams and meeting the requirement of a wider track gauge.

Description

Cross-references to related applications

[0001] This application claims priority to Chinese Patent Application No. 202310376652.4, filed on April 11, 2023, entitled “Telescopic Undercarriage and Working Machine,” which is hereby incorporated by reference in its entirety. Technical area

[0002] The present application relates to the technical field of work machines and in particular to a telescopic chassis and a work machine. Background technology

[0003] With the development of diversified applications of operating machinery, the structure of prime movers tends to be refined, user-friendly and easy to operate.

[0004] For example, in a crane, the frame of the current telescopic chassis is H-shaped, with both ends respectively engaging with the crawler frame. The crawler frame moves left and right under the action of the horizontal cylinder, thereby adjusting the spacing of the crawler frames to meet the performance requirements of the crane. In the working state, the crawler frame moves outward at the same time under the action of the horizontal cylinder, with the spacing of the crawler frames being the largest, so as to meet the requirements of high stability during the lifting of the crawler crane. In the transportation state, the crawler frame moves inward at the same time under the action of the horizontal cylinder, with the spacing of the crawler frames being the smallest, so as to meet the requirements of the road specification for crawler crane transportation.

[0005] In the state of the art, as in Fig. As shown in Figure 1, the length of the extension beam is limited by the width of the H-beam. Typically, an extension beam structure with a longer outer side and a shorter inner side is used to meet the span requirements of a wide track gauge. However, in the transport state, the two groups of short beams are located in the center of the H-beam arrangement, and the maximum length of the short beam is half the distance between the H-beams, which significantly limits the track width of the telescopic chassis. Contents of the invention

[0006] The present application provides a telescopic undercarriage and a work machine designed to overcome the known deficiency of two groups of short beams abutting each other in the center of an H-beam arrangement, with the maximum length of the short beams being half the distance between the H-beams, which significantly limits the track width of the telescopic undercarriage. While the H-beam size remains unchanged, the track width of the telescopic undercarriage can be increased by an inner extension beam with a free end that can be moved up and down.

[0007] The present application provides a telescopic chassis comprising: a pair of main beams arranged side by side, with an extension beam assembly arranged at one end of the pair of main beams; and an intermediate beam disposed between the pair of main beams; wherein the extension bracket assembly comprises: a pair of inner extension brackets, wherein the pair of inner extension beams are each connected to the corresponding ends of the main beams and the pair of inner extension beams are located on the same side of the intermediate beam; wherein the inner extension beams are switchable between a retracted and an extended state; wherein in the retracted state, the inner extension beams are perpendicular to the main beams, the free ends of the inner extension beams are both located between the pair of main beams, and the pair of inner extension beams are arranged offset in the vertical direction; wherein in the extended state, the inner extension beams each extend outwardly from the ends of the main beam; and a pair of complementary supports designed to compensate for the height of the free ends of the inner extension supports when extended.

[0008] According to the invention, the extension support assembly further comprises the following: a pair of outer extension beams, each connected to the ends of the main beam; wherein the outer extension beams and the inner extension beams are arranged adjacent to each other, respectively; and wherein the outer extension beams are switchable between a retracted and an extended state; wherein, in the retracted state, the pair of outer extension beams are each perpendicular to the corresponding main beams, and the free ends of the pair of outer extension beams are located on the outside of the main beam; wherein, in the extended state, the pair of outer extension beams extend outwardly from the ends of the main beam.

[0009] According to the invention, the extension support assembly comprises two groups, each located at the two ends of the main support.

[0010] According to the invention, each inner extension support comprises the following: a first base section which is hingedly connected to the main beam; a first transition section connected to the first base section, the top of the first transition section being an inclined surface; and an offset section connected to an end of the first transition section facing away from the first base section, wherein the offset section is arranged vertically with the corresponding complementary support for connecting the crawler frame.

[0011] According to the invention, the first transition section from the first base section to the offset section is inclined downwards.

[0012] According to the invention, each outer extension support comprises the following: a second base section which is hingedly connected to the main beam; a second transition section connected to the second base section, the top of the second transition section being an inclined surface; and a platform section connected to an end of the second transition section facing away from the second base section, wherein the platform section is configured to connect the crawler frame; and wherein the height of the platform section corresponds to the sum of the height of the corresponding offset section and the height of the complementary support after their connection.

[0013] According to the invention, the outer extension beam and the inner extension beam, which are connected to the same end of the same main beam, are detachably connected to each other via a connecting block.

[0014] According to the invention, the sum of the width of the outer extension beam and the width of the inner extension beam corresponds to the width of the corresponding main beam.

[0015] According to the invention, the first base section, the first transition section and the offset section are integrally connected to one another.

[0016] The present application further provides a work machine comprising a telescopic chassis as described above.

[0017] According to the invention, an intermediate beam and a pair of main beams form an H-beam, wherein the top of the intermediate beam is connected to the vehicle frame, an extension beam assembly is located at one end of the main beams, the extension beam assembly comprising a pair of inner extension beams, the pair of inner extension beams being each connected to the ends of the main beams and located on the same side of the intermediate beam, and the inner extension beams being switchable between retracted and extended states, wherein in the retracted state the inner extension beams are perpendicular to the main beams and the free ends of the inner extension beams are located between the two main beams, while the free ends of the inner extension beams are vertically offset,so that the arrangement of the upper and lower sections avoids interference problems and the length limitation of the extension beams due to size restrictions; and wherein, in the extended state, the inner extension beams extend outwards from the ends of the corresponding main beams, and by installing complementary beams, the free ends of the complementary beams and the inner extension beams are joined to form normal beams that can be connected to the crawler frame, i.e., based on the original length, the free ends of the inner extension beams are connected in a staggered upward and downward direction to increase the length of the inner extension beams and thus meet the requirements of a larger track gauge, so that the working operation is achieved by installing the complementary beams to the inner extension beams.

[0018] The present application further provides a work machine comprising the telescopic chassis described above and thus having the various advantages described above. Figures

[0019] To more clearly illustrate the technical solutions of the present application and the prior art, the figures necessary for describing the embodiments and the prior art are briefly presented below. Obviously, the figures described below represent some embodiments of the present application, and for general technical personnel in this field, additional figures can be created based on these figures without any creative effort. Fig. 1 shows a schematic representation of the structure of a telescopic chassis according to the prior art; Fig. 2 shows a schematic representation of the structure of a telescopic chassis of an embodiment of the present application, with one end in the extended state and the other end in the retracted state; Fig. 3 shows a schematic representation of the structure of a telescopic chassis of an embodiment of the present application, with one end in the retracted state and the other end in the extended state, from a different angle; Fig. 4 shows a schematic representation of the structure of a complementary carrier of an embodiment of the present application; Fig. 5 shows a side view of a telescopic chassis of an embodiment of the present application; Fig. 6 shows a further side view of a telescopic chassis of an embodiment of the present application. Reference symbols in the figures:

[0020] 1: Main beam; 2: Extension beam assembly; 3: Intermediate beam; 21: Inner extension bracket; 22: Outer extension bracket; 23: Complementary bracket; 231: Mounting hole; 211: First basic section; 212: First transition section; 213: Offset section; 221: Second base section; 222: Second transition section; 223: Platform section. Specific embodiments

[0021] In order to clarify the purpose, technical solutions and advantages of the present application, the technical solutions of the present application are described clearly and completely below with reference to the figures, and it should be understood that the described embodiments only constitute a part of the present application and do not represent the entirety of all embodiments. Based on the embodiments in the present application, all other embodiments that the general technical personnel obtain without creative efforts fall within the scope of this application.

[0022] In describing the embodiments of the present application, it should be understood that azimuth or positional relationships referring to the terms "center," "longitudinal," "transverse," "top," "bottom," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inside," "outside," etc., comprise the azimuth or positional relationships based on the figures and are intended solely to facilitate and simplify the description of the present application, rather than to indicate or imply that the stated device or component must have a particular orientation, be constructed, and operate in a particular orientation. Therefore, they should not be construed as limiting the embodiments of the present application.Furthermore, the terms “first,” “second,” and “third” are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] The telescopic chassis of the present application is described below with reference to the Fig. 2 to 6.

[0024] As in Fig. 2 and Fig. 3, an embodiment of the present application provides a telescopic chassis having an upper surface adapted for connection to a vehicle frame, comprising: a pair of main beams 1, an extension beam assembly 2, and an intermediate beam 3, wherein the main beam 1 is arranged side by side, the distance between a pair of the main beams 1 determines the track width of the chassis, and an extension beam assembly 2 is arranged at one end of the pair of main beams 1; wherein the intermediate beam 3 is arranged between the pair of main beams 1, and the upper surface of the intermediate beam 3 is connected to the vehicle frame; wherein the intermediate beam 3 and a pair of the main beams 1 form an H-beam arrangement which can not only bear the entire load-bearing capacity, but also has an upper surface adapted for connection to the vehicle frame.When using the extension beam assembly 2 in the working state, the track width of the chassis is increased.

[0025] As in the Fig. 3 and Fig. 4, the extension beam assembly 2 comprises a pair of inner extension beams 21 and a pair of complementary beams 23, wherein the pair of inner extension beams 21 are each connected to the ends of the main beam 1, typically in an articulated connection; the pair of inner extension beams 21 are located on the same side of the intermediate beam 3; the inner extension beams 21 are switchable between a retracted and an extended state; wherein the retracted state corresponds to the transport state of the work machine, and the extension beam assembly 2 is retracted to meet the transport requirements of the work machine due to its limited width. In the extended state, the extension beam assembly 2 is extended according to the working state of the work machine, and the wider track width can meet the application requirements in more working conditions.In the retracted state, the inner extension beams 21 are perpendicular to the main beams 1, the free ends of the inner extension beams 21 are both located between the pair of main beams 1, that is, the contraction process of the pair of inner extension beams 21 is a relative contraction, that is, one of the inner extension beams 21 rotates counterclockwise and the other inner extension beam 21 rotates clockwise; the pair of inner extension beams 21 both rotate toward the common area between the pair of main beams 1.The height of the free ends of the pair of inner extension beams 21 is lower than that of the corresponding main beams 1, and the pair of inner extension beams 21 are staggered in the vertical direction; by arranging the space up and down, the interference problem of the ends of the inner extension beams 21 is eliminated and the length limitation of the extension beam caused by size limitations is avoided; in the extended state, the inner extension beam 21 extends outward from each end of the main beam 1 to increase the track width of the telescopic chassis and meet the application requirements of more working conditions.

[0026] One end of the inner extension beam 21 is connected to the main beam 1 and the other end is considered as a free end.

[0027] A pair of complementary beams 23 are connected to the ends of the inner extension beam 21. The complementary beams 23 are designed to equalize the height of the free end of the inner extension beam 21 in the extended state. This means that when the free end of the inner extension beam 21 is at the lower end, the corresponding complementary beam 23 is arranged at the top of the free end of the inner extension beam 21. When the free end of the inner extension beam 21 is in the upper middle section, the corresponding complementary beam 23 is arranged at the bottom of the free end of the inner extension beam 21, and the complementary beam 23 is designed to support the free end. By arranging the complementary beam 23, the free ends of a pair of inner extension beams 21 are brought to the same height and can be connected to the crawler frame and adapted to the application requirements.

[0028] In one embodiment of the present application, the extension beam assembly 2 further comprises a pair of outer extension beams 22, and the pair of outer extension beams 22 are respectively connected to the ends of the main beam 1; the outer extension beams 22 and the inner extension beams 21 are respectively arranged adjacent to each other, and the outer extension beams 22 are switchable between a retracted state and an extended state; the retracted state corresponds to the transport state of the work machine, and the extended state corresponds to the working state of the work machine.In the retracted state, the pair of outer extension beams 22 are each perpendicular to the corresponding main beams 1, and the free ends of the pair of outer extension beams 22 are located on the outside of the main beam 1; in the extended state, the pair of outer extension beams 22 extend outward from the ends of the main beam 1, wherein the ends of the outer extension beams 22 and the ends of the inner extension beams 21 may be flush or not flush, and when the ends of the outer extension beams 22 and the ends of the inner extension beams 21 are flush, the force of the extension beam assembly 2 is more uniform.That is, in the retracted state, the inner extension beams 21 and the outer extension beams 22, which are located at the same end of the main beam 1, are located on both sides of the main beam 1; in the extended state, the inner extension beams 21 and the outer extension beams 22, which are located at the same end of the main beam 1, are arranged side by side at one end of the main beam 1. By combining the extended and retracted states, the design with equal length of the inner extension beams 21 and the outer extension beams 22 is enabled, thus providing a reliable and practical solution for the development of the future telescopic chassis.

[0029] As in Fig. 2 and Fig. 3, in one embodiment of the present application, the extension support assembly 2 has two groups, each located at the two ends of the main support 1. The track width can be increased at both ends of the main support 1, i.e., the track width can be doubled. It should be noted that in the transport state of the work machine, the two groups of extension support assemblies 2 are simultaneously in the retracted state; and that in the working state of the work machine, the two groups of extension support assemblies 2 are simultaneously in the extended state.

[0030] As in Fig. 3, in one embodiment of the present application, each inner extension beam 21 comprises a first base portion 211, a first transition portion 212, and an offset portion 213, wherein the first base portion 211 is pivotally connected to the main beam 1, and the first base portion 211 and the main beam 1 may also be movably connected by other connection methods to facilitate switching the inner extension beams 21 between the retracted and extended states; wherein the first transition portion 212 is connected to the first base portion 211, and the top surface of the first transition portion 212 is an inclined surface; and wherein the offset portion 213 is connected to an end of the first transition portion 212 remote from the first base portion 211, and the offset portion 213 is vertically arranged with the corresponding complementary beam 23 for connecting the crawler frame.For simplicity, the offset portions of the pair of inner extension beams 21 are referred to as the first and second offset portions. To avoid interference between the first and second offset portions when the inner extension beam 21 is contracted, the top surface of the first offset portion is flush with the bottom surface of the second offset portion, or the top surface of the first offset portion is slightly lower than the bottom surface of the second offset portion, for example, if the first offset portion is lower in the vertical direction. This achieves the staggered arrangement of the first offset portion and the second offset portion.

[0031] In order to achieve a smooth transition connection between the first base section 211 and the offset section 213 in one embodiment of the present application, the first transition section 212 is inclined downwards from the first base section 211 to the offset section 213 and the first transition section 212 is smoothly connected to the offset section 213.

[0032] In one embodiment of the present application, each outer extension beam 22 comprises a second base section 221, a second transition section 222, and a platform section 223, wherein the second base section 221 is pivotally connected to the main beam 1, and the second base section 221 and the main beam 1 can also be movably connected by other connection methods to facilitate switching the outer extension beams 22 between the retracted and extended states; wherein the second transition section 222 is connected to the second base section 221, and the top surface of the second transition section 222 is an inclined surface; wherein the platform section 223 is connected to an end of the second transition section 222 remote from the second base section 221, and the platform section 223 is configured to connect the crawler frame;and wherein the height of the platform section corresponds to the sum of the height of the corresponding offset section 213 and the height of the complementary beam 23 after their connection, ie the corresponding platform section 223, the offset section 213 and the complementary beam 23 of the inner extension beam 21 and the outer extension beam 22, which are connected to the same main beam 1, are connected to the crawler frame at the same time to realize a stable double beam structure.;

[0033] In other words, the inner extension beam 21 and the outer extension beam 22, which are connected to the same main beam 1, rotate in different directions when changing from the extended state to the retracted state; and they also rotate in different directions when changing from the retracted state to the extended state.

[0034] In one embodiment of the present application, the outer extension beam 22 and the inner extension beam 21, which are connected to the same end of the same main beam 1, are detachably connected to each other via a connecting block. In the working state, the inner extension beam 21 and the outer extension beam 22, which are connected to the same main beam 1, are connected and fixed via a connecting block to form a structurally stable double beam structure of equal length; in the transport state, the inner extension beam 21 and the outer extension beam 22, which are connected to the same main beam 1, are disassembled to facilitate the retraction of the inner extension beam 21 and the outer extension beam 22, respectively, onto the two sides of the main beam 1, thus meeting the transport width limitation requirements.

[0035] In one embodiment of the present application, the sum of the width of the outer extension support 22 and the width of the inner extension support 21 corresponds to the width of the corresponding main support 1, so that the outer extension support 22 and the inner extension support 21 form a stable structure with the main support 1.

[0036] In one embodiment of the present application, the first base portion 211, the first transition portion 212 and the offset portion 213 are integrally connected to each other, which facilitates the processing of the inner extension beam 21 and makes the structure more stable.

[0037] As in Fig. 4, the structure of the complementary support 23 is generally similar to that of the offset section 213; the side of the complementary support 23 facing the first transition section 212 is flat. During assembly, one side of the complementary support 23 rests against or is in close contact with the side surface of the first transition section 212, and the side facing away from the complementary support 23 is arcuate. Furthermore, mounting holes 231 are formed correspondingly on the complementary support 23 and on the offset section 213, with the axis of the mounting hole 231 running vertically, i.e.when the complementary beam 23 and the offset portion 213 are installed, the complementary beam 23 and the inner extension beam 21 are simultaneously fastened and fixed by the positioning pin through the mounting holes 231 of the complementary beam 23 and the offset portion 213, thereby ensuring the stability of the structure of the extension beam assembly 2 in the operating state.

[0038] In summary, the embodiments of the present application, as shown in the Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig.6, a telescopic chassis is provided, the upper side of which is connected to the vehicle frame and which comprises a pair of main beams 1 and an intermediate beam 3, wherein one end or both ends of the pair of main beams 1 are provided with an extension beam assembly 2, and the extension beam assembly 2 comprises a pair of inner extension beams 21, a pair of outer extension beams 22, and a pair of complementary beams 23, wherein an inner extension beam 21, an outer extension beam 22, and a complementary beam 23 are arranged at the end of each main beam 1, and the inner extension beam 21 and the outer extension beam 22 are switchable between a retracted state and an extended state, wherein in the retracted state, the inner extension beam 21 and the outer extension beam 22 are perpendicular to the main beam 1,the inner extension beam 21 and the outer extension beam 22 are arranged on both sides of the main beam 1, the complementary beam 23 is disassembled for standby operation, and a pair of offset sections 213 are offset in the vertical direction to fully utilize the space between the pair of main beams 1, and wherein, in the extended state, the inner extension beam 21 and the outer extension beam 22 are extended to the end of the main beam 1 to extend the main beam 1 and thus increase the track width of the chassis, and in the extended state, the complementary beam 23 balances the height of the offset section 213 of the inner extension beam 21 so that the tops of the pair of offset sections 213 and the pair of complementary beams 23 lie on the same horizontal line, which facilitates assembly with the crawler frame.

[0039] The work machine described in this application is described below and reference can be made correspondingly to the work machine described below and the telescopic chassis described above.

[0040] A further embodiment of the present application relates to a work machine with the telescopic chassis described above.

[0041] In the embodiment of the present application, the type of work machine is not limited. For example, the work machine can be an excavator, a crane, a loader, etc. In other words, as long as the work machine is capable of utilizing the telescopic chassis in the present application.

[0042] The working machine provided in the present application has the various advantages described above since it includes the telescopic chassis described above.

[0043] When describing the embodiments of the present application, it should be noted that the terms "connected" and "connecting" are to be understood in the broadest sense, unless expressly stated and limited otherwise. For example, the connection may be fixed, detachable, or integral; the connection may be mechanical or electrical; the connection may be direct or indirect via an intermediate medium. General technical personnel in the field will understand the specific meanings of the above terms in the embodiments of the present application depending on the specific circumstances.

[0044] Throughout this specification, the reference terms "one embodiment," "some embodiments," "embodiment," "specific embodiment," or "some embodiments," etc., mean that the specific features, structures, materials, or properties described in combination with the embodiment or embodiment are included in at least one embodiment or embodiment of the embodiments of the present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the described specific features, structures, materials, or properties may be combined in any suitable manner in one or more embodiments or examples.Furthermore, technical personnel may combine and link different embodiments or examples and features of different embodiments or examples described in this specification, provided they do not conflict with each other.

[0045] Finally, it should be noted that the above embodiments merely serve to illustrate the technical solutions of the present application and do not limit them; although the present application has been described in detail with reference to the above embodiments, it is possible for those skilled in the art to modify the technical solutions described in the above embodiments or to replace some of the technical features included therein with equivalent elements; however, these modifications or replacements do not cause the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application. QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] CN 202310376652.4

[0001]

Claims

[1] Telescopic chassis comprising: a pair of main beams (1) arranged side by side, with an extension beam assembly (2) arranged at one end of the pair of main beams (1); and an intermediate beam (3) disposed between the pair of main beams (1); wherein the extension beam assembly (2) comprises: a pair of inner extension beams (21), the pair of inner extension beams (21) being respectively connected to the corresponding ends of the main beams (1), and the pair of inner extension beams (21) being located on the same side of the intermediate beam (3); wherein the inner extension supports (21) are switchable between a retracted and an extended state; wherein in the retracted state, the inner extension supports (21) are perpendicular to the main supports (1), the free ends of the inner extension supports (21) are both located between the pair of main supports (1), the height of the free ends of the pair of inner extension supports (21) is less than that of the corresponding main supports (1), and the pair of inner extension supports (21) are arranged offset in the vertical direction; wherein in the extended state, the inner extension supports (21) each extend outwards from the ends of the main support (1); and a pair of complementary supports (23) designed to compensate for the height of the free ends of the inner extension supports (21) in the extended state. [2] Telescopic chassis according to claim 1, wherein the extension beam assembly (2) further comprises: a pair of outer extension beams (22) each connected to the ends of the main beam (1); wherein the outer extension beams (22) and the inner extension beams (21) are arranged adjacent to each other, and wherein the outer extension beams (22) are switchable between a retracted and an extended state; wherein, in the retracted state, the pair of outer extension beams (22) are each perpendicular to the corresponding main beams (1), and the free ends of the pair of outer extension beams (22) are located on the outside of the main beam (1); wherein, in the extended state, the pair of outer extension beams (22) extend outwardly from the ends of the main beam (1). [3] Telescopic chassis according to claim 1, wherein the extension beam assembly (2) comprises two groups, each located at the two ends of the main beam (1). [4] A telescopic chassis according to claim 2, wherein each inner extension beam (21) comprises: a first base section (211) which is hingedly connected to the main support (1); a first transition section (212) connected to the first base section (211), the top of the first transition section (212) being an inclined surface; and an offset section (213) connected to an end of the first transition section (212) facing away from the first base section (211), wherein the offset section (213) is arranged vertically with the corresponding complementary support (23) for connecting the crawler frame. [5] Telescopic chassis according to claim 4, wherein the first transition section (212) is inclined downwards from the first base section (211) to the offset section (213). [6] A telescopic chassis according to claim 4, wherein each outer extension beam (22) comprises: a second base section (221) which is hingedly connected to the main support (1); a second transition portion (222) connected to the second base portion (221), the top of the second transition portion (222) being an inclined surface; and a platform section (223) connected to an end of the second transition section (222) facing away from the second base section (221); wherein the platform section (223) is designed to connect the crawler frame and the height of the platform section (223) corresponds to the sum of the height of the corresponding offset section (213) and the height of the complementary support (23) after their connection. [7] Telescopic chassis according to claim 2, wherein the outer extension beam (22) and the inner extension beam (21), which are connected to the same end of the same main beam (1), are detachably connected to each other via a connecting block. [8] Telescopic chassis according to claim 2, wherein the sum of the width of the outer extension beam (22) and the width of the inner extension beam (21) corresponds to the width of the corresponding main beam (1). [9] Telescopic chassis according to claim 4, wherein the first base section (211), the first transition section (212) and the offset section (213) are integrally connected to one another. [10] Work machine comprising a telescopic chassis according to one of claims 1 to 9.

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