Hoop for assembling cooling pipeline of commercial vehicle and assembling method of hoop

Abstract

The invention relates to the technical field of vehicle fasteners, and discloses a hoop for assembling a cooling pipeline of a commercial vehicle and an assembling method of the hoop. The worm is horizontally limited and rotationally sleeved at the left side end of the hoop shell; the lower end of the hoop shell is limited and fixed to one end of the steel belt, and the other end of the steel belt slidably sleeves the hoop shell and is meshed with the worm. The hoop shell and the steel belt jointly form a hose fastening annular space; at least one torque identification section is carved on the outer surface of the right side end, away from the hoop shell, of the steel belt, the meshed steel belt is driven to move leftwards through rotation of the worm, and the at least one torque identification section on the steel belt can move into the right side end of the hoop shell. According to the method, torque identifiers are arranged at different fixing points on the hoop by researching the corresponding relation between the hoop diameter, the identifier and the arc length from the tail end of the hoop shell and the torque after the hoop is assembled; the hoop assembling torque can be efficiently and accurately controlled by using a common pneumatic assembling tool, and the torque measuring procedure and the measuring cost are saved.

Description

Technical Field

[0001] This invention relates to the field of automotive fastener technology, and in particular to a clamp for assembling cooling pipes in commercial vehicles and its assembly method. Background Technology

[0002] Cooling technology for new energy commercial vehicles is developing towards integrated thermal management + heat pumps; compared with traditional vehicles, the number of assembly and connection points for cooling hoses in integrated thermal management systems increases by 200%, posing a great challenge to the sealing performance of the vehicle's thermal management system.

[0003] See Figure 1 As shown, the current commercial vehicle thermal management system's cooling water circuit mainly consists of a cooling hose 1', a metal connector 2', and a clamp 3'. The cooling hose 1' is fitted onto the metal connector 2', and the cooling hose is compressed by tightening the clamp 3' to achieve a water circuit seal. Based on this structure, the assembly torque of the clamp becomes a crucial parameter affecting the cooling water circuit seal. If the assembly torque does not meet the design requirements, the clamp's compression force on the cooling hose is insufficient, leading to leakage in the cooling pipe. If the assembly torque exceeds the design requirements, the clamp will damage the cooling hose, resulting in hose breakage and leakage. Currently, the main method for controlling the assembly torque of the cooling hose clamp in commercial vehicle assembly is to tighten it with an electric impact wrench and then check it with a torque wrench. This torque control method has low efficiency and is limited by the space available for the cooling pipe layout; the torque wrench check cannot achieve 100% coverage. How to efficiently and accurately control the clamp assembly torque during the cooling pipe assembly process has become an important issue in the commercial vehicle assembly field.

[0004] Chinese patent document CN218598535U discloses a clamp assembly resistant to torque deformation, including a clamp body, an adjustment structure fixedly connected to one end of the clamp body, a support block fixedly connected to the inner wall of the adjustment structure, a protrusion fixedly connected to the top of the support block, the adjustment structure including a fixing block, a bolt rotatably connected to the inner wall of the fixing block, and a nut rotatably connected to the outside of the bolt. This application focuses on clamp resistance to torque deformation, but it does not substantially improve how to efficiently and accurately control the clamp assembly torque during the assembly of cooling pipes.

[0005] Chinese patent document CN104251352A discloses a helical spring worm gear clamp, including a clamp band and a clamp seat. The clamp seat has an inner cavity with a cylindrical portion for mounting the worm and a grooved portion for fixing the clamp band. One end of the clamp band is fixed in the grooved portion of the clamp seat, and the other end of the clamp band has a section of worm teeth along its length. After the end of the clamp band with worm teeth rotates, it passes through the grooved portion of the clamp seat, causing the clamp band to bend into a circle. A worm is mounted on the clamp seat. The worm has a rotating force-applying end located outside the clamp seat and a meshing end inserted into the inner cavity of the cylindrical portion of the clamp seat. The meshing end has a section of meshing teeth that mesh with the worm teeth on the clamp band. The worm gear at the rotating force-applying end and the worm tooth of the clamp extend in the same direction. The rotation of the worm can drive the worm tooth end of the clamp to move through meshing. A helical spring is also fitted on the rotating force-applying end of the worm. There is a washer fitted on the worm between the helical spring and the clamp seat. The diameter of the washer matches the diameter of the helical spring. The end of the rotating force-applying end of the worm has a bolt head. The inner diameter of the bolt head matches the diameter of the bolt spring, so that the two ends of the helical spring abut between the bolt head and the washer. This clamp application focuses on high installation efficiency and small assembly space, but it does not substantially improve how to efficiently and accurately control the clamp assembly torque during the assembly of cooling pipes. Summary of the Invention

[0006] To address the aforementioned issues, this invention provides a clamp for assembling cooling pipes in commercial vehicles and its assembly method. By studying the correspondence between the clamp diameter, the arc length of the marking from the end of the clamp shell, and the torque after assembly, torque markings are innovatively set at different fixing points on the clamp. In actual assembly, the operator can efficiently and accurately control the clamp assembly torque using ordinary pneumatic assembly tools, saving torque measurement procedures and assembly costs, and facilitating the mass assembly of cooling hoses in commercial vehicles.

[0007] This invention proposes a clamp for assembling cooling pipes in commercial vehicles, comprising a clamp housing, a worm gear, and a steel strip;

[0008] The worm gear is horizontally limited and rotated, and is sleeved on the left side of the hoop.

[0009] The lower end of the hoop is fixed to one end of the steel strip, and the other end of the steel strip is slidably sleeved on the hoop and meshes with the worm gear to realize power transmission and direction conversion; the hoop and the steel strip together form a hose fastening annular space;

[0010] At least one torque marking segment is engraved on the outer surface of the right end of the steel strip away from the clamp housing. The rotation of the worm gear drives the meshing steel strip to move to the left, allowing at least one torque marking segment on the steel strip to move into the right end of the clamp housing. This type of clamp needs to be used in combination with cooling pipes of specific steel strip material and dimensions. In actual operation, the appropriate clamp size is selected based on the cooling pipe dimensions. During the clamp tightening process, when the torque marking segment moves into the right end of the clamp housing, whether it is the starting or ending point of the torque marking segment reaching the right side of the clamp housing... The end faces are all within the compliant torque range, avoiding the leakage of the cooling hose caused by insufficient compression force of the clamp due to insufficient worm gear adjustment torque in the prior art, and also avoiding damage to the cooling hose caused by the clamp if the worm gear adjustment torque exceeds the design requirements, thus leading to hose breakage and leakage. This application eliminates the above concerns. Only the compliant torque marking section on the surface of the tightened clamp needs to be observed to achieve the compliant torque of the clamp assembly. There is no need to use a torque wrench to check whether the applied torque is compliant, saving the torque compliance measurement process and assembly costs.

[0011] The steel strip is made of 10Cr worm gear driven spring-compensated clamp. 10Cr is a low-alloy high-strength structural steel, characterized by a carbon content of approximately 0.10% and a chromium content of 0.80%-1.10%.

[0012] %, featuring high strength and a certain degree of corrosion resistance.

[0013] At least two consecutive torque marking segments are engraved on the outer surface of the steel strip, and the arc lengths of adjacent torque marking segments are equidistant. This design is for the same clamp specification free diameter, while matching different sizes of hose inner and outer diameters. Multiple torque marking segments can be continuously engraved on the same steel strip, giving it a certain degree of versatility when using the same clamp specification free diameter.

[0014] A clamp for assembling cooling pipes in commercial vehicles also includes a cooling hose. The outer wall of the cooling hose can make limited contact with the inner surface of a steel strip. The cooling hose is made of EPDM + aramid thread. EPDM refers to ethylene propylene diene monomer (EPDM), a copolymer of ethylene, propylene, and non-conjugated dienes. It has excellent resistance to oxidation, ozone, and corrosion and is widely used. The combination of EPDM and aramid thread is a high-performance combination that combines the elastic sealing of rubber with the high-strength reinforcement of aramid. Its core function is to improve the wear resistance, tear resistance, and structural stability of the product.

[0015] When the free diameter of the clamp is in the range of 18mm-32mm, the outer diameter of the cooling hose is in the range of 16mm-30mm, and the difference between the inner and outer diameters of each type of cooling hose is 7mm (for clamps of different free diameters in the standard series produced by the manufacturer). The arc length between the starting end line of the torque marking segment closest to the right end of the clamp housing and the right end face of the clamp housing is 9.42mm-15.7mm, and the arc length between the ending end line of the torque marking segment farthest from the right end of the clamp housing and the right end face of the clamp housing is 15.7mm-43.96mm, and the arc length of each torque marking segment is 6mm. 28mm. Depending on the requirements of different clamp specifications, such as free diameter, clamp steel strip thickness, clamp steel strip width, matching hose inner and outer diameter, and design sealing torque, the starting end of the torque marking segment is marked accordingly. For the same clamp specification with a free diameter, but different sizes of matching hose inner and outer diameters, multiple torque marking segments can be continuously engraved on the same steel strip. The minimum diameter range of the clamp when the torque is compliant is 13mm-18mm, and the maximum diameter range of the clamp when the torque is compliant is 15mm-28mm. The clamp diameter adjustment range for each matching hose outer diameter when the torque is compliant is 2mm.

[0016] The torque marking section is coated with a color layer. During operation, the operator uses a pneumatic tool to rotate the worm gear. The worm gear, carrying the steel strip, moves along the hoop from right to left, causing the tight annular space formed by the hoop and the steel strip to contract. When the starting end of the color block of the torque marking section reaches the right end face of the hoop, or when the color block part of the torque marking section enters the right end face of the hoop, or when the ending end of the color block of the torque marking section reaches the right end face of the hoop, it indicates that the clamp assembly has reached the design torque. The operator can visually see the positional relationship between the compliant color block section on the steel strip and the right end of the hoop, greatly saving assembly time and improving the efficiency of compliant assembly. The color layer of the torque marking section is a fluorescent layer, which allows for visual completion of compliant torque operation without the need for a light source in extremely low light conditions.

[0017] The left end of the hoop is provided with a limiting ring. The upper right side of the limiting ring extends to the right with an arc surface. The front and rear ends of the right side of the arc surface are bent downwards with connecting arms. The two connecting arms interlock to form the rotation limiting cavity of the worm. The inner surfaces of the two interlocking connecting arms are aligned and welded to the inner surface of one end of the steel strip. The two connecting arms that are aligned and interlocked on the inner surface of one end of the steel strip are respectively provided with hoop connecting arm limiting protrusions on the left and right sides to further maintain the fixed position relationship between the hoop and the steel strip and prevent the hoop from sliding on the outer surface of the steel strip as the worm rotates due to insecure welding. The other end of the steel strip is provided with a number of worm meshing holes evenly arranged along the length direction. The other end of the steel strip is slidably sleeved on the rotation limiting cavity and connected to the worm through the worm meshing holes. Each torque marking segment is provided on the outer surface of the steel strip where the worm meshing hole is located.

[0018] At least two consecutive torque marking segments are set on the outer surface of the steel strip. The outer diameter of the cooling hose is marked sequentially from left to right in each torque marking segment. The outer diameter of the cooling hose is marked in ascending order from left to right. This allows the clamp to be used in cases where the free diameter of the clamp is the same but the inner and outer diameters of the cooling hose are different. By identifying the outer diameter of the cooling hose with the same outer diameter marking on the torque marking segment, the worm gear can be quickly adjusted to tighten the steel strip to the compliant torque value area of ​​the cooling hose on the outer surface of the steel strip.

[0019] A clamp for assembling cooling pipes in commercial vehicles also includes a steel strip retainer and supporting spring plates. The steel strip retainer is an elongated arc-shaped piece, with symmetrically arranged bending limiting protrusions at both ends and the middle of its two long sides. The supporting spring plates are constructed of M-shaped curved spring steel sheets. The middle of the M-shaped curved spring steel sheets is in contact with a pair of bending limiting protrusions in the middle of the elongated arc-shaped piece, and the two ends of the M-shaped curved spring steel sheets elastically contact the left and right surfaces of the elongated arc-shaped piece. The steel strip can slide left and right against the outer surface of the elongated arc-shaped piece and is restricted from vertical displacement by the two pairs of bending limiting protrusions at the left and right ends of the elongated arc-shaped piece. The portion of the steel strip above the elongated arc-shaped piece is respectively in contact with the M-shaped curved surface... The two arc-shaped protrusions of the spring steel sheet slide elastically in contact. The functions of the steel strip retainer and supporting spring sheet are: A) Initial clamping: During installation, the clamp is tightened by the worm bolt and steel strip. At this time, the spring sheet is compressed and undergoes elastic deformation, storing rebound force to firmly fix the connected parts (such as cooling hoses); B) Dynamic compensation: When the connected parts have gaps or slight displacements due to temperature changes (thermal expansion and contraction) or vibration, the spring sheet will release the stored rebound force, automatically extending / contracting to fill the gaps, offset the displacement, and prevent the clamp from loosening; C) Continuous sealing: The rebound force of the spring sheet always acts on the connection part, maintaining a stable clamping force, thereby maintaining the sealing effect and preventing fluid leakage from the gap between the cooling hose and the metal joint.

[0020] An assembly method, applied to a clamp used for assembling cooling pipes in commercial vehicles, is characterized by the following steps:

[0021] S1. Based on the dimensions of the metal connector, determine the matching inner and outer diameter dimensions of the cooling hose and select the corresponding clamp.

[0022] S2. First, attach the clamp to the cooling hose with the matching inner and outer diameter selected in S1. Then, insert the cooling hose with the matching inner and outer diameter to the metal connector, so that the cooling hose completely covers the metal connector.

[0023] S3. Move the clamp to a distance of 10mm-15mm from the front end of the cooling hose;

[0024] S4. Use a power tool to rotate the worm gear at a constant speed to make the steel strip of the clamp fit against the cooling hose. Then, rotate the worm gear slowly at a constant speed of less than 150 rpm to make the steel strip retract until the torque mark corresponding to the outer diameter of the cooling hose is located on the right end face of the clamp housing, thus completing the compliant clamp assembly.

[0025] Beneficial effects

[0026] This invention innovatively sets torque markings at different fixing points on the clamp by studying the correspondence between the clamp diameter, the arc length of the marking from the end of the clamp shell, and the torque after the clamp is assembled. In actual assembly, the operator can use ordinary pneumatic assembly tools to efficiently and accurately control the clamp assembly torque, saving torque measurement procedures and costs, and facilitating the mass assembly of cooling hoses for commercial vehicles. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the existing technology structure.

[0028] Figure 2 This is a schematic diagram of the three-dimensional structure of the clamp of the present invention. Figure 1 .

[0029] Figure 3 This is a schematic diagram of the three-dimensional structure of the clamp of the present invention. Figure 2 .

[0030] Figure 4 This is a schematic diagram of the cross-sectional structure of the clamp of the present invention.

[0031] Figure 5 This is a partial structural diagram of the clamp of the present invention with the clamp shell removed.

[0032] Figure 6 This is a schematic diagram of the combined structure of the steel strip retainer and the supporting spring sheet of the present invention.

[0033] Figure 7 This is a schematic diagram of the overall structure of the present invention.

[0034] In the picture:

[0035] 1' Cooling hose; 2' Metal connector; 3' Clamp;

[0036] 1. Hoop; 11. Limiting ring; 12. Arc surface; 13. Connecting arm;

[0037] 2. Worm gear;

[0038] 3. Steel strip; 31. Torque marking section; 32. Hoop housing connecting arm limiting protrusion; 33. Worm gear meshing hole; 34. Cooling hose outer diameter dimension marking;

[0039] 4. Cooling hose;

[0040] 5. Steel strap retainer; 51. Long strip-shaped arc plate; 52. Bending limiting tongue;

[0041] 6. Support spring sheet. Detailed Implementation

[0042] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining the present invention and are not intended to limit the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0045] Example 1

[0046] See Figures 2-7 As shown, a clamp for assembling cooling pipes in commercial vehicles includes a clamp housing 1, a worm gear 2, and a steel strip 3;

[0047] The worm gear 2 is horizontally limited and rotated, and is sleeved on the left side of the hoop 1;

[0048] The lower end of the hoop 1 is fixed to one end of the steel strip 3, and the other end of the steel strip 3 is slidably sleeved on the hoop 1 and meshes with the worm gear 2; the hoop 1 and the steel strip 3 together form a hose fastening annular space.

[0049] A torque marking segment 31 is engraved on the outer surface of the right end of the steel belt 3 away from the hoop 1. The rotation of the worm gear 2 drives the meshing steel belt to move to the left, and the torque marking segment 31 on the steel belt 3 can move into the right end of the hoop 1.

[0050] The steel strip 3 is made of 10Cr worm gear drive spring compensation type clamp.

[0051] A clamp for assembling cooling pipes in commercial vehicles also includes a cooling hose 4, the outer wall of which can make limited contact with the inner surface of a steel strip 3, and the material of the cooling hose 4 is EPDM + aramid thread.

[0052] When the clamp specifications have a free diameter of 18mm, a steel strip thickness of 0.6mm, and a steel strip width of 9mm, the outer diameter of the cooling hose 4 is 16mm, the inner diameter of the cooling hose 4 is 9mm, the design sealing torque is 3.5Nm, the arc length between the starting end line of the unique torque marking segment 31 and the right end face of the clamp housing 1 is 9.42mm, the arc length between the ending end line of the torque marking segment 31 and the right end face of the clamp housing 1 is 15.7mm, and the clamp diameter is 13mm-15mm when the torque is within compliance.

[0053] Free diameter of clamp (mm) Steel band thickness (mm) Steel band width (mm) Cooling hose outer diameter (mm) Cooling hose inner diameter (mm) Design seal torque (Nm) Clamp diameter at compliance torque (mm) Steel band torque marker range (mm) 18（+2，0） 0.6±0.1 9（+0.3，0） 16 9 3.5 15-13 9.42—15.7

[0054] The torque marking segment 31 is coated with a color layer; the color layer of the torque marking segment 31 is a fluorescent layer.

[0055] The left end of the hoop 1 is provided with a limiting ring 11. The upper right side of the limiting ring 11 extends to the right with an arc surface 12. The front and rear ends of the right side of the arc surface 12 are bent downward with connecting arms 13. The two connecting arms 13 are interlocked to form the rotation limiting cavity of the worm 2. The inner surfaces of the two connecting arms 13 are aligned and welded to the inner surface of one end of the steel strip 3. The two connecting arms 13 are aligned and interlocked on the left and right sides of the two connecting arms 13. The other end of the steel strip 3 is provided with thirty-seven worm meshing holes 33 evenly arranged along the length direction. The other end of the steel strip 3 is slidably sleeved in the rotation limiting cavity and connected to the worm 2 through the worm meshing holes 33. Each torque marking segment 31 is provided on the outer surface of the steel strip 3 where the worm meshing holes 33 are located.

[0056] Example 2

[0057] See Figures 2-7 As shown, a clamp for assembling cooling pipes in commercial vehicles differs from other embodiments 1 in that two continuously arranged torque marking segments 31 are engraved on the outer surface of the steel strip 3, and the arc lengths of two adjacent torque marking segments 31 are equidistant from each other by 6.28 mm.

[0058] When the clamp's free diameter is 22mm, the steel strip thickness is 0.6mm, and the steel strip width is 9mm, the outer diameter of the cooling hose 4 is 18mm, the inner diameter of the cooling hose 4 is 11mm, and the designed sealing torque is 3.5Nm. The arc length between the starting end line of the second segment of the torque marking segment 31 and the right end face of the clamp housing 1 is 15.7mm, and the arc length between the ending end line of the second segment of the torque marking segment 31 and the right end face of the clamp housing 1 is 21.98mm. Furthermore, the clamp diameter is 15mm-17mm when the torque is within specifications. The clamp's free diameter is 22mm. When the steel strip thickness is 0.6mm and the steel strip width is 9mm, the outer diameter of the cooling hose 4 is 20mm and the inner diameter of the cooling hose 4 is 13mm. The designed sealing torque is 3.5Nm. The arc length between the starting end line of the first segment of the two torque marking segments 31 and the right end face of the hoop 1 is 9.42mm, and the arc length between the ending end line of the first segment of the torque marking segment 31 and the right end face of the hoop 1 is 15.7mm. When the torque is compliant, the clamp diameter is 17mm-19mm. This model of clamp is suitable for cooling hoses with two different outer diameters.

[0059] Free diameter of clamp (mm) Steel band thickness (mm) Steel band width (mm) Cooling hose outer diameter (mm) Cooling hose inner diameter (mm) Design seal torque (Nm) Clamp diameter at compliance torque (mm) Steel band torque marker range (mm) 22（+2，0） 0.6±0.1 9（+0.3,0） 18 11 3.5 17-15 15.7—21.98 22（+2,0） 0.6±0.1 9（+0.3,0） 20 13 3.5 19-17 9.42—15.7

[0060] Two consecutive torque marking segments 31 on the outer surface of the steel strip 3 are marked with the outer diameter dimension 34 of the cooling hose from left to right. The outer diameter dimension 34 of the cooling hose is marked with increasing numbers from left to right. The outer diameter dimension 34 of the cooling hose of this clamp is marked with "φ18" and "φ20" respectively.

[0061] A clamp for assembling cooling pipes in commercial vehicles also includes a steel strip retainer 5 and a supporting spring plate 6. The steel strip retainer 5 is an elongated arc-shaped piece 51. The two long sides of the elongated arc-shaped piece 51 are symmetrically provided with bending limiting protrusions 52 at the left and right ends and the middle position. The supporting spring plate 6 is composed of an M-shaped curved spring steel sheet. The middle part of the M-shaped curved spring steel sheet is limited to contacting a pair of bending limiting protrusions 52 in the middle of the elongated arc-shaped piece 51. The two ends of the M-shaped curved spring steel sheet are elastically contacted on the left and right sides of the elongated arc-shaped piece 51. The steel strip 3 can slide left and right to contact the outer surface of the elongated arc-shaped piece 51 and is restricted to vertical displacement by the two pairs of bending limiting protrusions 52 at the left and right ends of the elongated arc-shaped piece 51. The part of the steel strip 3 above the elongated arc-shaped piece 51 is elastically slidably contacted with the two arc-shaped protrusions of the M-shaped curved spring steel sheet.

[0062] Example 3

[0063] See Figures 2-7As shown, a clamp for assembling cooling pipes in commercial vehicles differs from other embodiments 2 in that the outer surface of the steel strip 3 is engraved with three continuously arranged torque marking segments 31, and the arc lengths of two adjacent torque marking segments 31 are equidistant from each other by 6.28 mm.

[0064] When the clamp specifications have a free diameter of 25mm, a steel strip thickness of 0.8mm, and a steel strip width of 9mm, the outer diameter of the cooling hose 4 is 18mm, the inner diameter of the cooling hose 4 is 11mm, and the designed sealing torque is 6.5Nm. The arc length between the starting end line of the third segment of the torque marking segment 31 and the right end face of the clamp housing 1 is 28.26mm, and the arc length between the ending end line of the third segment of the torque marking segment 31 and the right end face of the clamp housing 1 is 34.54mm. The clamp diameter is 14mm-16mm when the torque is within specifications. When the clamp specifications have a free diameter of 25mm, a steel strip thickness of 0.8mm, and a steel strip width of 9mm, the outer diameter of the cooling hose 4 is 20mm, the inner diameter of the cooling hose 4 is 13mm, and the designed sealing torque is 6.5Nm. The arc length between the starting end line of the second segment of the torque marking segment 31 and the right end face of the clamp housing 1 is 28.26mm, and the arc length between the ending end line of the third segment of the torque marking segment 31 and the right end face of the clamp housing 1 is 34.54mm. The arc length of the end face is 21.98mm. The arc length between the termination line of the second torque marking segment 31 and the right end face of the clamp 1 is 28.26mm. When the torque is within compliance, the clamp diameter is 16mm-18mm. When the clamp specification has a free diameter of 25mm, a steel strip thickness of 0.8mm, and a steel strip width of 9mm, the outer diameter of the cooling hose 4 is 22mm, the inner diameter of the cooling hose 4 is 15mm, and the design sealing torque is 6.5Nm. The arc length between the starting line of the first segment of the torque marking segment 31 and the right end face of the clamp 1 is 15.7mm. The arc length between the termination line of the first segment of the torque marking segment 31 and the right end face of the clamp 1 is 21.98mm. When the torque is within compliance, the clamp diameter is 18mm-20mm. This clamp model is suitable for three different outer diameter cooling hoses.

[0065] Free diameter of clamp (mm) Steel band thickness (mm) Steel band width (mm) Cooling hose outer diameter (mm) Cooling hose inner diameter (mm) Design seal torque (Nm) Clamp diameter at compliance torque (mm) Steel band torque marker range (mm) 25（+2,0） 0.8±0.1 9（+0.3,0） 18 11 6.5 16-14 28.26—34.54 25（+2,0） 0.8±0.1 9（+0.3,0） 20 13 6.5 18-16 21.98—28.26 25（+2,0） 0.8±0.1 9（+0.3,0） 22 15 6.5 20-18 15.7—21.98

[0066] The three consecutive torque marking segments 31 on the outer surface of the steel strip 3 are marked with the outer diameter dimension 34 of the cooling hose from left to right. The outer diameter dimension 34 of the cooling hose is marked with increasing numbers from left to right. The outer diameter dimension 34 of the cooling hose of this clamp is marked with "φ18", "φ20" and "φ22" respectively.

[0067] Example 4

[0068] See Figures 2-7 As shown, a clamp for assembling cooling pipes in commercial vehicles differs from other embodiments 3 in that the outer surface of the steel strip 3 is engraved with five continuously arranged torque marking segments 31, and the arc lengths of two adjacent torque marking segments 31 are equidistant from each other by 6.28 mm.

[0069] When the clamp specifications have a free diameter of 27mm, a steel strip thickness of 0.8mm, and a steel strip width of 12mm, the outer diameter of the cooling hose 4 is 18mm, the inner diameter of the cooling hose 4 is 11mm, and the design sealing torque is 6.5Nm. The arc length between the starting end line of the fifth segment of the torque marking segment 31 and the right end face of the clamp housing 1 is 34.54mm, and the arc length between the ending end line of the fifth segment of the torque marking segment 31 and the right end face of the clamp housing 1 is 40.82mm. The clamp diameter is 14mm-16mm when the torque is within specifications. When the clamp specifications have a free diameter of 27mm, a steel strip thickness of 0.8mm, and a steel strip width of 12mm, the outer diameter of the cooling hose 4 is 20mm. The inner diameter of the cooling hose 4 is 13mm, and the designed sealing torque is 6.5Nm. The arc length between the starting end line of the fourth segment of the torque marking segment 31 and the right end face of the hoop 1 is 28.26mm, and the arc length between the ending end line of the fourth segment of the torque marking segment 31 and the right end face of the hoop 1 is 34.54mm. The clamp diameter is 16mm-18mm when the torque is within compliance. When the free diameter of the clamp is 27mm, the steel strip thickness is 0.8mm, and the steel strip width is 12mm, the outer diameter of the cooling hose 4 is 22mm, the inner diameter of the cooling hose 4 is 15mm, and the designed sealing torque is 6.5Nm. The arc length between the starting end line of the third segment of the torque marking segment 31 and the right end face of the hoop 1 is 28.26mm, and the arc length between the ending end line of the fourth segment of the torque marking segment 31 and the right end face of the hoop 1 is 34.54mm. The arc length of the right end face is 21.98mm. The arc length between the termination line of the torque marking segment 31 in the third segment and the right end face of the hoop 1 is 28.26mm. The diameter of the clamp is 18mm-20mm when the torque is within compliance. When the free diameter of the clamp is 27mm, the steel strip thickness is 0.8mm, and the steel strip width is 12mm, the outer diameter of the cooling hose 4 is 24mm, the inner diameter of the cooling hose 4 is 17mm, and the designed sealing torque is 6.5Nm. The arc length between the starting line of the second segment of the torque marking segment 31 in the fifth segment and the right end face of the hoop 1 is 15.7mm. The arc length between the termination line of the second segment of the torque marking segment 31 and the right end face of the hoop 1 is 21.98mm. The clamp diameter is 20mm-22mm when the torque is within compliance range (98mm). When the clamp's free diameter is 27mm, the steel strip thickness is 0.8mm, and the steel strip width is 12mm, the outer diameter of the cooling hose 4 is 26mm, the inner diameter of the cooling hose 4 is 19mm, and the design sealing torque is 6.5Nm. The arc length between the starting end line of the first segment of the torque marking segment 31 and the right end face of the clamp housing 1 is 9.42mm, and the arc length between the ending end line of the first segment of the torque marking segment 31 and the right end face of the clamp housing 1 is 15.7mm. The clamp diameter is 22mm-24mm when the torque is within compliance range. This clamp model is suitable for five different outer diameter cooling hoses.

[0070] Free diameter of clamp (mm) Steel band thickness (mm) Steel band width (mm) Cooling hose outer diameter (mm) Cooling hose inner diameter (mm) Design seal torque (Nm) Clamp diameter at compliance torque (mm) Steel band torque marker range (mm) 27（+2,0） 0.8±0.1 12（+0.3,0） 18 11 6.5 16-14 34.54—40.82 27（+2,0） 0.8±0.1 12（+0.3,0） 20 13 6.5 18-16 28.26—34.54 27（+2,0） 0.8±0.1 12（+0.3,0） 22 15 6.5 20-18 21.98—28.26 27（+2,0） 0.8±0.1 12（+0.3,0） 24 17 6.5 22-20 15.7—21.98 27（+2,0） 0.8±0.1 12（+0.3,0） 26 19 6.5 24-22 9.42—15.7

[0071] The five consecutive torque marking segments 31 on the outer surface of the steel strip 3 are marked with the outer diameter dimension 34 of the cooling hose from left to right. The outer diameter dimension 34 of the cooling hose is marked with increasing numbers from left to right. The outer diameter dimension 34 of the cooling hose of this clamp is marked with "φ18", "φ20", "φ22", "φ24" and "φ26" respectively.

[0072] Example 5

[0073] See Figures 2-7As shown, a clamp for assembling cooling pipes in commercial vehicles differs from other embodiments in that, when the clamp's free diameter is 32mm, the steel strip thickness is 0.8mm, and the steel strip width is 12mm, the outer diameter of the cooling hose 4 is 22mm, the inner diameter of the cooling hose 4 is 15mm, the designed sealing torque is 6.5Nm, the arc length between the starting end line of the fifth segment of the torque marking segment 31 and the right end face of the clamp housing 1 is 37.68mm, and the arc length between the ending end line of the fifth segment of the torque marking segment 31 and the right end face of the clamp housing 1 is 43.96mm. Furthermore, the clamp diameter is 18mm-20mm when the torque is within specifications; the clamp's free diameter is 32mm, and the steel strip thickness is 0.8mm. When the steel strip width is 12mm, the outer diameter of the cooling hose 4 is 24mm, the inner diameter of the cooling hose 4 is 17mm, and the designed sealing torque is 6.5Nm. The arc length between the starting end line of the fourth segment of the torque marking segment 31 and the right end face of the hoop 1 is 31.4mm, and the arc length between the ending end line of the fourth segment of the torque marking segment 31 and the right end face of the hoop 1 is 37.68mm. The clamp diameter is 20mm-22mm when the torque is within compliance. The free diameter of the clamp is 32mm, the steel strip thickness is 0.8mm, and the steel strip width is 12mm. The outer diameter of the cooling hose 4 is 26mm, the inner diameter of the cooling hose 4 is 19mm, and the designed sealing torque is 6.5Nm. The arc length between the fifth segment of the torque marking segment... The arc length between the starting end line of the third segment of 31 and the right end face of the hoop 1 is 25.12mm. The arc length between the ending end line of the torque marking segment 31 and the right end face of the hoop 1 is 31.4mm. The clamp diameter is 22mm-24mm when the torque is within compliance. When the clamp's free diameter is 32mm, the steel strip thickness is 0.8mm, and the steel strip width is 12mm, the outer diameter of the cooling hose 4 is 28mm, the inner diameter of the cooling hose 4 is 21mm, and the designed sealing torque is 6.5Nm. The arc length between the starting end line of the second segment of the torque marking segment 31 and the right end face of the hoop 1 is 18.84mm. The arc length between the ending end line of the second segment of the torque marking segment 31 and the right end face of the hoop 1 is... The arc length is 25.12mm, and the clamp diameter is 24mm-26mm when the torque is within compliance. When the clamp specification has a free diameter of 32mm, a steel strip thickness of 0.8mm, and a steel strip width of 12mm, the outer diameter of the cooling hose 4 is 30mm, the inner diameter of the cooling hose 4 is 23mm, the design sealing torque is 6.5Nm, the arc length between the starting end line of the first segment of the torque marking segment 31 and the right end face of the clamp shell 1 is 12.56mm, the arc length between the ending end line of the first segment of the torque marking segment 31 and the right end face of the clamp shell 1 is 18.84mm, and the clamp diameter is 26mm-28mm when the torque is within compliance. This model of clamp is applicable to five different outer diameter cooling hoses.

[0074] Free diameter of clamp (mm) Steel band thickness (mm) Steel band width (mm) Cooling hose outer diameter (mm) Cooling hose inner diameter (mm) Design seal torque (Nm) Clamp diameter at compliance torque (mm) Steel band torque marker range (mm) 32（+2,0） 0.8±0.1 12（+0.3,0） 22 15 6.5 20-18 37.68—43.96 32（+2,0） 0.8±0.1 12（+0.3,0） 24 17 6.5 22-20 31.4—37.68 32（+2,0） 0.8±0.1 12（+0.3,0） 26 19 6.5 24-22 25.12—31.4 32（+2,0） 0.8±0.1 12（+0.3,0） 28 21 6.5 26-24 18.84—25.12 32（+2,0） 0.8±0.1 12（+0.3,0） 30 23 6.5 28-26 12.56—18.84

[0075] The five consecutive torque marking segments 31 on the outer surface of the steel strip 3 are marked with the outer diameter dimension 34 of the cooling hose from left to right. The outer diameter dimension 34 of the cooling hose is marked with increasing numbers from left to right. The outer diameter dimension 34 of the cooling hose of this clamp is marked with "φ22", "φ24", "φ26", "φ28" and "φ30" respectively.

[0076] Example 6

[0077] See Figures 2-7 Free diameter of clamp (mm) Steel band thickness (mm) Steel band width (mm) Cooling hose outer diameter (mm) Cooling hose inner diameter (mm) Design seal torque (Nm) Clamp diameter at compliance torque (mm) Steel band torque marker range (mm) Figures 2-7 As shown, an assembly method is applied to a clamp used for assembling cooling pipes in commercial vehicles, characterized by the following steps:

[0078] S1. Based on the dimensions of the metal connector, determine the matching inner and outer diameter dimensions of the cooling hose and select the corresponding clamp.

[0079] S2. First, attach the clamp to the cooling hose with the matching inner and outer diameter selected in S1. Then, insert the cooling hose with the matching inner and outer diameter to the metal connector, so that the cooling hose completely covers the metal connector.

[0080] S3. Move the clamp to a distance of 10mm-15mm from the front end of the cooling hose;

[0081] S4. Use a power tool to rotate the worm gear at a constant speed to make the steel strip of the clamp fit against the cooling hose. Then, rotate the worm gear slowly at a constant speed of less than 150 rpm to make the steel strip retract until the torque mark corresponding to the outer diameter of the cooling hose is located on the right end face of the clamp housing, thus completing the compliant clamp assembly.

[0082] Although the invention has been specifically shown and described in conjunction with preferred embodiments, those skilled in the art should understand that various changes in form and detail may be made to the invention without departing from the spirit and scope of the invention as defined in the appended claims, all of which shall be within the scope of protection of the invention.

Claims

1. A clamp for commercial vehicle cooling line assembly, characterized by: Includes hoop (1), worm gear (2), and steel strip (3); The worm (2) is horizontally limited and rotated, and is sleeved on the left side of the hoop (1); The lower end of the hoop (1) is fixed to one end of the steel strip (3), and the other end of the steel strip (3) is slidably sleeved on the hoop (1) and meshes with the worm (2); the hoop (1) and the steel strip (3) together form a hose fastening annular space; At least one torque marking segment (31) is engraved on the outer surface of the right end of the steel belt (3) away from the hoop (1). The meshing steel belt is moved to the left by the rotation of the worm (2), and at least one torque marking segment (31) on the steel belt (3) can be moved to the right end of the hoop (1).

2. A clamp for cooling line assembly of a commercial vehicle as claimed in claim 1, wherein: The steel strip (3) is made of 10Cr worm gear drive spring compensation type clamp.

3. A clamp for cooling line assembly of a commercial vehicle as claimed in claim 2, wherein: At least two consecutive torque marking segments (31) are engraved on the outer surface of the steel strip (3), and the arc lengths of adjacent torque marking segments (31) are equidistant.

4. A clamp for cooling line assembly of a commercial vehicle as claimed in claim 3, wherein: It also includes a cooling hose (4), the outer wall of which can be in contact with the inner surface of the steel strip (3) for a limiting contact. The material of the cooling hose (4) is EPDM + aramid thread.

5. A clamp for cooling line assembly of a commercial vehicle as claimed in claim 4, wherein: When the free diameter range of the clamp specification is 18mm-32mm, the outer diameter range of the cooling hose (4) is 16mm-30mm, and the difference between the inner and outer diameters of each cooling hose (4) is 7mm. The arc length between the starting end line of the torque marking segment (31) closest to the right end of the clamp shell (1) and the right end face of the clamp shell (1) is 9.42mm-15.7mm. The arc length between the ending end line of the torque marking segment (31) furthest from the right end of the clamp shell (1) and the right end face of the clamp shell (1) is 15.7mm-43.96mm. The arc length of each torque marking segment (31) is 6.28mm. The minimum diameter range of the clamp when the torque is compliant is 13mm-18mm, and the maximum diameter range of the clamp when the torque is compliant is 15mm-28mm. The clamp diameter adjustment range for the compliant torque corresponding to the outer diameter of each matching hose is 2mm.

6. A clamp for cooling line assembly of a commercial vehicle as claimed in claim 5, wherein: The torque marking segment (31) is coated with a color layer; the color layer of the torque marking segment (31) is a fluorescent layer.

7. A clamp for cooling line assembly of a commercial vehicle as claimed in claim 6, wherein: The left end of the hoop (1) is provided with a limiting ring (11). The upper right side of the limiting ring (11) extends to the right with an arc surface (12). The front and rear ends of the arc surface (12) are bent downward with connecting arms (13). The two connecting arms (13) are interlocked to form a rotating limiting cavity for the worm (2). The inner surfaces of the two connecting arms (13) are aligned and welded to the inner surface of one end of the steel strip (3). The two connecting arms (13) that are aligned and interlocked at one end of the steel strip (3) are respectively provided with hoop connecting arm limiting protrusions (32) on the left and right sides. The other end of the steel strip (3) is evenly provided with several worm meshing holes (33) along the length direction. The other end of the steel strip (3) is slidably sleeved in the rotating limiting cavity and connected to the worm (2) through the worm meshing holes (33). Each torque marking segment (31) is provided on the outer surface of the steel strip (3) where there are worm meshing holes (33).

8. A clamp for cooling line assembly of a commercial vehicle as claimed in claim 7, wherein: At least two continuous torque mark sections (31) on the outer surface of the steel band (3) are marked with cooling rubber pipe outer diameter size marks (34) from left to right in each torque mark section (31) in sequence, and the marked cooling rubber pipe outer diameter size marks (34) are sequentially increased from left to right.

9. A clamp for cooling line assembly of a commercial vehicle as claimed in claim 8, wherein: The steel band holder (5) is a long strip-shaped arc piece (51) as a whole, and the left and right ends and the middle part of the two long edges of the long strip-shaped arc piece (51) are symmetrically provided with bent limiting tabs (52) in front and back. The support spring piece (6) is composed of an M-shaped curved spring sheet as a whole. The middle part of the M-shaped curved spring sheet is limited to contact a pair of bent limiting tabs (52) in the middle part of the long strip-shaped arc piece (51), and the two ends of the M-shaped curved spring sheet are elastically contacted on the left and right surfaces of the long strip-shaped arc piece (51), respectively. The steel band (3) can be elastically contacted on the outer surface of the long strip-shaped arc piece (51) and be limited to move up and down by the two pairs of bent limiting tabs (52) at the left and right ends of the long strip-shaped arc piece (51). The part of the steel band (3) above the long strip-shaped arc piece (51) is elastically and slidably contacted with the two arc-shaped protruding parts of the M-shaped curved spring sheet.

10. Assembly method for a clamp for the assembly of a cooling line for a utility vehicle according to one of claims 1 to 9, characterized in that The steps are as follows: S1, according to the size of the metal joint, determine the matching cooling rubber pipe with inner and outer diameter size, select the corresponding size of the clamp; S2, first, the clamp is sleeved on the cooling rubber pipe with matching inner and outer diameter size selected in S1, then the cooling rubber pipe with matching inner and outer diameter size is inserted into the metal joint, and the cooling rubber pipe completely covers the metal joint; S3, move the clamp to a position 10-15mm away from the front end of the cooling rubber pipe; S4, rotate the worm at a constant speed by using an electric tool, so that the steel band of the clamp is in contact with the cooling rubber pipe, then rotate the worm at a constant speed and slowly at a speed less than 150r / min to drive the steel band to shrink to the torque mark section corresponding to the cooling rubber pipe outer diameter size mark, which is located at the right side end surface of the clamp shell, and the compliant clamp assembly is completed.

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