Fastening structure of torque tube

Abstract

The utility model discloses a fastening structure of torque tube, and its subject is to fasten torque tube without gap and firmly to the opposite side part, and ensure the loading and unloading of torque tube in market service. A fastening structure of torque tube, the torque tube that keeps the rotating shaft in the inside is fastened to the opposite side part (engine, variable speed drive axle) through the dowel pin, wherein the dowel pin is pressed into the opposite side part (engine, variable speed drive axle), and is riveted and fixed to the torque tube side in the locating state of the rotating shaft.

Description

Technical Field

[0001] This utility model relates to a fastening structure for a torque tube. Background Technology

[0002] In powertrains used in vehicles and the like, as described in Patent Document 1, a torque tube fastening structure is used, in which a torque tube that holds the rotating shaft such as the propeller shaft is fastened to the opposite component such as the engine or the transmission drive axle via a locating pin.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2009-214649 Utility Model Content

[0004] In powertrains that use torque tubes, from a market service perspective, it is difficult to remove the entire powertrain from the vehicle during maintenance. Therefore, it is necessary to be able to separate the torque tube's fastening surface from the fastening surfaces (joint surfaces) of the engine and transmission drive axle when they are in the vehicle's onboard configuration.

[0005] Furthermore, when assembling the powertrain, for external inputs that are too large in the operating environment of the vehicle, such as the torque input on the engine side and the road input on the transmission drive axle, the locating pins need to be securely fastened to both the torque tube and the opposite side component without any clearance.

[0006] However, typically, in the assembled state of the powertrain, there are manufacturing tolerance deviations in the assembly position accuracy of the rotating shaft relative to the locating pin fixed to the torque tube. When the deviation is large, significant axial misalignment occurs at the connection between the rotating shaft held by the torque tube and the opposite shaft held by the opposite component (such as the engine propeller shaft or the input shaft of the transmission drive axle). This makes it difficult to detach the rotating shaft and, consequently, the torque tube during aftermarket service, resulting in the inability to install or remove the torque tube relative to the engine and transmission drive axle in their on-board state.

[0007] The objective of this invention is to securely fasten the torque tube to the opposite side component without gaps, and to ensure the ease of installation and removal of the torque tube during market service.

[0008] This utility model is a fastening structure for a torque tube. The torque tube, which holds the rotating shaft inside, is fastened to the opposite side component via a positioning pin. The positioning pin is pressed into the opposite side component and is riveted to the side of the torque tube when the rotating shaft is in the positioning state.

[0009] Utility Model Effect

[0010] According to this invention, the torque tube can be securely fastened to the opposite side component without gaps, and the ease of installation and removal of the torque tube during market service can be ensured. Attached Figure Description

[0011] Figure 1 This is a schematic diagram illustrating one embodiment of the fastening structure of the torque tube involved in this utility model.

[0012] Figure 2 This is a schematic diagram used to illustrate the function and effect of this utility model.

[0013] Figure 3 This is a schematic diagram showing the powertrain to which this utility model is applicable. Detailed Implementation

[0014] As one embodiment of the present invention, the powertrain 100 for vehicles, etc., is as follows: Figures 1 to 3 As shown, it is configured to be installed between the engine 10 and the transmission drive axle 20 via a torque tube 30.

[0015] The engine 10 and the transmission drive axle 20 are opposite components fastened to the torque tube 30. The torque tube 30 internally holds the rotating shaft (propeller shaft) 31 via a bearing 32. The output shaft (not shown) of the engine 10 is connected to one end of the rotating shaft 31, and the input shaft 21, which supplies input to the transmission drive axle 20, is connected to the other end of the rotating shaft 31. Figure 2 In the transmission drive axle 20, the input shaft 21 is held in the transmission drive axle 20 via the bearing 22.

[0016] The torque tube 30 is fastened to the fastening surface of the transmission drive axle 20, which is a component on the opposite side, using locating pins 40 and locating pin holes 51 and 52. In the following description of this specification, only the fastening structure between the torque tube 30 and the transmission drive axle 20 using locating pins 40 is illustrated and explained. Figure 1 , Figure 2 However, the same fastening structure using other locating pins and locating pin holes is also used in the fastening part between the torque tube 30 and the engine 10.

[0017] In addition, Figure 1 , Figure 2 The torque tube 30 shown is connected to the connecting sleeve 60 by inserting into the end of the rotating shaft 31 of the torque tube 30 and the end of the input shaft 21 of the transmission drive axle 20, so as to transmit rotational force.

[0018] In the assembled state of powertrain 100, such as Figure 2 As shown, there is a deviation in the manufacturing tolerance of the assembly accuracy (interaxial distance L between the locating pin 40 and the rotating shaft 31) of the rotating shaft 31 relative to the locating pin 40 fixed to the torque tube 30. That is, relative to... Figure 2 The nominal tolerance condition shown in (A) is in... Figure 2 Under the maximum tolerance condition shown in (B), the above assembly position accuracy deviation is large. Figure 2In case (B), the central axis of the rotating shaft 31 becomes oblique to the central axis of the connecting sleeve 60 of the input shaft 21 provided in the connecting part. As a result, the rotating shaft 31 applies a bending load to the connecting sleeve 60, making it difficult to detach the rotating shaft 31 and cut the torque tube 30 during market service.

[0019] Therefore, in this embodiment, in order to securely fasten the torque tube 30 to the engine 10 or transmission drive axle 20, which are opposing components, without gaps, and to ensure the ease of installation and removal of the torque tube 30 during market service, a method is adopted... Figure 1 The structure is as follows: the positioning pin 40 is pressed into the positioning pin hole 51 provided on the fastening surface of the transmission drive axle 20 and fixed axially; in the positioning state of the rotating shaft 31, it is riveted and fixed to the positioning pin hole 52 provided on the fastening surface of the torque tube 30.

[0020] Specifically, this is done through (1) and (2) below.

[0021] (1) In order to absorb as much clearance as possible, so as to allow for the deviation of the assembly position accuracy (the distance L between the locating pin 40 and the rotating shaft 31) of the rotating shaft 31 relative to the aforementioned locating pin 40 according to the manufacturing accuracy of the engine 10, the transmission drive axle 20, the torque tube 30, etc., the locating pin hole 52 into the locating pin 40 is enlarged to the required extent.

[0022] (2) The locating pin 40, which is pressed into the locating pin hole 51 on the side of the transmission drive axle 20 and fixed axially, is adjusted radially and axially to the locating pin hole 52 on the side of the torque tube 30 within the gap range of (1) above. Thus, the locating pin 40 is riveted and fixed to the locating pin hole 52 on the side of the torque tube 30 in an assembly state that ensures the assembly position accuracy of the rotation axis 31 of the torque tube 30 relative to the locating pin 40.

[0023] In this embodiment, the cylindrical locating pin 40, while inserted into the locating pin hole 52, undergoes plastic deformation to expand its diameter and is riveted to the inner diameter of the locating pin hole 52, thus achieving a gap-filling and fixed state that absorbs the aforementioned gap. Figure 1 In (B), 52A represents the bushing that forms the inner diameter of the locating pin hole 52, and 40A represents the expanded diameter portion of the locating pin 40.

[0024] Therefore, according to this embodiment, the following effects are achieved.

[0025] (a) During the assembly of the powertrain 100, the locating pin 40 is pressed into the opposing components (engine 10, transmission drive axle 20) and riveted to the torque tube 30 side while the rotating shaft 31 is in the locating state. Therefore, in the assembly state where the assembly position accuracy of the rotating shaft 31 relative to the locating pin 40 fixed to the torque tube 30 is ensured to the required accuracy, the locating pin 40 is securely fastened to both the torque tube 30 and the opposing components without any clearance, thus ensuring vehicle performance.

[0026] (b) During the assembly of the powertrain 100, the locating pin 40, which has not yet been riveted to the torque tube 30 side, has a constant gap relative to the locating pin hole 52 on the torque tube 30 side. Therefore, after the locating pin 40 and the locating pin hole 52 on the torque tube 30 side are adjusted in the radial and axial directions within the aforementioned gap range, and the assembly position accuracy of the rotating shaft 31 relative to the locating pin 40 is ensured, it is riveted to the locating pin 40.

[0027] That is, after absorbing the deviation in the assembly position accuracy of the rotating shaft 31 relative to the locating pin 40 fixed to the torque tube 30 within the aforementioned gap range due to manufacturing tolerances, the torque tube 30 is riveted and fixed to the locating pin 40 to fill the gap and is firmly fixed in the axial and radial directions. As a result, the rotating shaft 31 on the torque tube 30 side can be connected to the opposing side shaft on the transmission drive axle 20 (or engine 10) side, which is the opposite side component, in a positioning assembly state that eliminates axial misalignment between the two. Thus, the central axis of the rotating shaft 31 will not be obliquely intersected with the central axis of the connecting sleeve 60 of the input shaft 21 of the transmission drive axle 20, and the rotating shaft 31 can be easily detached and the torque tube 30 cut off during market service, enabling the installation and removal of the engine 10 and transmission drive axle 20 relative to the torque tube 30 in vehicle-mounted mode.

[0028] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the specific structure of the present utility model is not limited to this embodiment. As long as it does not depart from the spirit of the present utility model, design changes and other modifications can be included in the present utility model.

[0029] Industrial availability

[0030] As described above, according to this invention, the torque tube can be securely fastened to the opposite side component without gaps, and the ease of installation and removal of the torque tube during market service can be ensured.

[0031] Symbol Explanation

[0032] 10-Engine (opposite side component), 20-Transmission drive axle (opposite side component), 30-Torque tube, 40-Positioning pin.

Claims

1. A fastening structure for a torque tube, wherein the torque tube, which internally holds a rotating shaft, is fastened to a counterpart component via a locating pin, the fastening structure for the torque tube being characterized in that... The locating pin is pressed into the opposite side component and, in the locating state of the rotating shaft, is riveted and fixed to the torque tube side.

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