A main and sub-tank interlocking device

Abstract

A main and auxiliary gearbox interlocking device, a three-fourth gear shift fork shaft is replaced by a lengthened three-fourth gear shift fork shaft, and an auxiliary gearbox shift fork shaft is replaced by an auxiliary gearbox shift fork shaft with an inclined groove, and an interlocking unit is additionally added; the auxiliary gearbox synchronizer is prevented from switching from a high gear to a low gear, and the main gearbox gear position is not allowed to be engaged before the auxiliary gearbox synchronizer is engaged in place, thereby reducing the failure rate of the auxiliary gearbox synchronizer, and the overall structure is simple, easy to process, has a small number of parts, and is low in cost; whether to install can be selected according to the application scene, and the practicality and flexibility are stronger.

Description

Technical Field

[0001] The present invention belongs to the technical field of transmissions, and in particular relates to a main and auxiliary box interlocking device. Background Art

[0002] Most commercial vehicle transmissions utilize a main and auxiliary transmission structure. The auxiliary transmission typically uses a cylinder to propel a cylinder shaft, driving the auxiliary transmission shift fork axially and reciprocatingly. The shift fork then drives the auxiliary transmission synchronizer sleeve to shift gears, enabling high and low gear shifting. To reduce the risk of damage to the auxiliary transmission synchronizer due to driver misoperation, it is generally recommended that the driver preselect the high and low gear preselect valve before shifting the main transmission synchronizer. Before engaging the desired main transmission gear, the driver should pause in neutral for 0.5 seconds to ensure that the auxiliary transmission synchronizer is fully engaged before engaging the main transmission gear. However, this recommendation cannot be fully implemented, so mechanical design must ensure that the main transmission gear cannot be engaged before the auxiliary transmission synchronizer is fully engaged. Currently, most commercial vehicle transmissions on the market utilize a main and auxiliary transmission interlocking device with an interlocking plate, such as the Fast S series and Sinotruk HW transmissions. However, these interlocking devices consist of multiple components, including an interlocking plate, a pressure plate, multiple pressure plate bolts, and a spring seat. The detailed structure of these devices is not described here. The interlocking devices currently used in the market have many parts, complex structures, and require high precision, making machining difficult and costly. Adding this interlocking device to light commercial vehicle transmissions would significantly increase costs. Furthermore, based on market data collected on auxiliary synchronizer failures in light commercial vehicle transmissions, low-speed synchronizer failures account for over 70% of all auxiliary synchronizer failures.

[0003] Existing main and auxiliary box shifting mechanisms are as follows Figure 2 , including the main transmission shift mechanism: the reverse gear fork shaft assembly (1 reverse gear fork shaft, 2 reverse gear fork, 3 reverse gear guide block), 4 first and second gear shift forks, the third and fourth gear shift fork shaft assembly (5 third and fourth gear shift fork shaft, 6 third and fourth gear guide block, 7 reversing guide block, 8 third and fourth gear shift fork), and the auxiliary transmission shift mechanism: 9 auxiliary transmission shift fork shaft, 10 auxiliary transmission shift fork. The main transmission shift mechanism and the auxiliary transmission shift mechanism are not mechanically connected and are independent of each other. During the movement of the auxiliary transmission shift fork shaft 9, the main transmission shift fork shaft (1 reverse gear fork shaft, 5 third and fourth gear shift fork shaft) can freely shift into gear. In this case, the main transmission synchronizer will not be in place before the auxiliary transmission synchronizer is engaged, causing the synchronous inertia of the auxiliary transmission synchronizer to increase sharply, which can easily damage the auxiliary transmission synchronizer. Summary of the Invention

[0004] In view of the above problems, the purpose of the present invention is to provide a main and auxiliary box interlocking device, which solves the problems of auxiliary box synchronizer low gear side failure and the complex structure and high cost of existing interlocking devices through reasonable arrangement of component structures.

[0005] To achieve the above-mentioned purpose, the technical solutions adopted by the present invention include:

[0006] A main-and-sub-box interlocking device includes an extended third-and-fourth gear shift fork shaft, the length of the extended third-and-fourth gear shift fork shaft is greater than the length of the reverse gear shift fork shaft, one end of the extended third-and-fourth gear shift fork shaft passes through the reversing guide block and the third-and-fourth gear guide block in sequence coaxially, and a limit groove is provided near the upper part of one end of the extended third-and-fourth gear shift fork shaft; it also includes an auxiliary box shift fork shaft with an oblique groove, one end of the auxiliary box shift fork shaft with an oblique groove passes through the auxiliary box shift fork coaxially, and an oblique groove is provided at the lower part of the auxiliary box shift fork shaft with an oblique groove; it also includes an interlocking unit, the interlocking unit includes an interlocking plate hinged on the shell between the main box and the auxiliary box, and the hinge point of the interlocking plate is located at the interlocking The plate is not the end portion, and the hinge axis of the interlocking plate is parallel to each fork shaft; a limiting boss is provided at the lower portion of one end of the interlocking plate, and a positioning spring is fixed on the shell below the limiting boss, and the upper end of the positioning spring is sleeved on the outer periphery of the limiting boss, and the upper portion of one end of the interlocking plate is slidably arranged along the axial direction of the auxiliary box fork shaft with the bevel groove on the lower portion of the auxiliary box fork shaft with the bevel groove, and the upper portion of one end of the interlocking plate is in mechanical contact with the bevel groove; the lower portion of the other end of the interlocking plate is in movable limiting contact with the limiting groove; when the upper portion of one end of the interlocking plate is located in the bevel groove, the positioning spring is in a natural state, and the lower portion of the other end of the interlocking plate is in limiting contact with the limiting groove.

[0007] Preferably, the hinge point of the interlocking plate is provided with a positioning through hole, and further comprises a positioning shaft which coaxially passes through the positioning through hole and hinges the interlocking plate to the housing.

[0008] Preferably, one end of the positioning shaft is a limiting end, and the middle section of the positioning shaft near the limiting end is a platform stage, which is located in the positioning through hole, and there is a clearance fit between the platform stage and the positioning through hole.

[0009] Preferably, the contact surfaces of the interlocking plate with the limiting groove and the inclined groove are respectively provided with second chamfers.

[0010] Preferably, the bevel groove is provided with a first chamfer along both axial ends of the auxiliary box shift fork shaft with the bevel groove.

[0011] Compared with the prior art, the advantages of the present invention are:

[0012] (1) The main and auxiliary gearbox interlocking device of the present invention prevents the auxiliary gearbox synchronizer from switching from high gear to low gear by rationally arranging the component structure. The main gearbox gear is not allowed to be engaged before the auxiliary gearbox synchronizer is engaged, thereby reducing the failure rate of the auxiliary gearbox synchronizer. The overall structure is simple and easy to process, the number of parts is small, and the cost is low.

[0013] (2) The interlocking device of the main and auxiliary boxes of the present invention can be installed or not according to the application scenario, and has better practicality and flexibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following detailed description, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 It is a structural schematic diagram of the main and auxiliary box interlocking device of the present invention;

[0016] Figure 2 This is a structural diagram of the main and auxiliary gearbox shifting mechanism;

[0017] Figure 3 This is a working principle diagram of the main and auxiliary box interlocking device of the present invention (auxiliary box high gear area);

[0018] Figure 4 This is a working principle diagram of the main and auxiliary box interlocking device of the present invention (the auxiliary box right high gear switching and resistance process);

[0019] Figure 5 This is a working principle diagram of the main and auxiliary box interlocking device of the present invention (auxiliary box low gear area);

[0020] Figure 6 for Figure 1 Stereoscopic view of the center positioning axis;

[0021] Figure 7 for Figure 1 Assembly cross-section of the center positioning shaft and interlocking plate;

[0022] Figure 8 for Figure 1 Schematic diagram of the structure of the interlocking plate.

[0023] The symbols in the figure represent:

[0024] 0 housing, 1 reverse gear fork shaft, 2 reverse gear fork, 3 reverse gear guide block, 4 first and second gear shift forks, 5 third and fourth gear shift fork shaft, 6 third and fourth gear guide blocks, 7 reversing guide block, 8 third and fourth gear shift forks, 9 auxiliary gear shift fork shaft, 10 auxiliary gear shift fork, 11 cylinder;

[0025] A extended third and fourth gear shift fork shaft, B interlocking plate, C positioning shaft, D positioning spring, E auxiliary box shift fork shaft with bevel groove;

[0026] A0 limit groove; B1 limit boss, B2 second chamfer, B3 positioning through hole; C1 limit end, C2 stage; E0 inclined groove. DETAILED DESCRIPTION

[0027] The invention is not limited to the following specific embodiments, and all equivalent modifications made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0028] It should be noted that the directional terms mentioned in this article, such as "upper part", "lower part" and "end part", are consistent with the specific directions on the paper in the drawings of the specification or the corresponding directions in the space shown in the drawings; all components and equipment in the present invention, unless otherwise specified, are all components and equipment known in the prior art.

[0029] Example

[0030] This embodiment discloses a main-and-auxiliary case interlocking device, comprising an extended third-and-fourth gear shift fork shaft A, the extended third-and-fourth gear shift fork shaft A being longer than the reverse gear shift fork shaft 1, one end of the extended third-and-fourth gear shift fork shaft A coaxially passing through a reversing guide block 7 and a third-and-fourth gear guide block 6 in sequence, and a stop groove A0 being provided near the upper portion of one end of the extended third-and-fourth gear shift fork shaft A. Specifically, the third-and-fourth gear shift fork shaft 5 in the existing mechanism is replaced with the extended third-and-fourth gear shift fork shaft A, and the stop groove A0 is provided near the upper portion of one end of the extended third-and-fourth gear shift fork shaft A.

[0031] The mechanism further comprises an auxiliary case shift fork shaft E with an oblique groove, one end of which coaxially passes through the auxiliary case shift fork 10, and an oblique groove E0 is provided on the lower portion of the auxiliary case shift fork shaft E with an oblique groove; that is, the auxiliary case shift fork shaft 9 in the existing mechanism is replaced with the auxiliary case shift fork shaft E with an oblique groove, and an oblique groove E0 is provided on the lower portion of the auxiliary case shift fork shaft E with an oblique groove;

[0032] It also includes an interlocking unit, which includes an interlocking plate B hinged on the shell 0 between the main box and the auxiliary box, the hinge point of the interlocking plate B is located at the non-end part of the interlocking plate B, and the hinge axis of the interlocking plate B is parallel to each fork shaft; a limiting boss B1 is provided at the lower part of one end of the interlocking plate B, and a positioning spring D is fixed on the shell 0 below the limiting boss B1, and the upper end of the positioning spring D is sleeved on the outer periphery of the limiting boss B1, and the upper part of one end of the interlocking plate B is axially slidably arranged on the lower part of the auxiliary box fork shaft E with the bevel groove, and the upper part of one end of the interlocking plate B is in mechanical contact with the bevel groove E0; the lower part of the other end of the interlocking plate B is in movable limiting contact with the limiting groove A0; when the upper part of one end of the interlocking plate B is located in the bevel groove E0, the positioning spring D is in a natural state, and the lower part of the other end of the interlocking plate B is in limiting contact with the limiting groove A0.

[0033] like Figure 3 As shown, when the auxiliary box is in the high gear range (5th or 6th gear), the right side of the interlocking plate B is at the top right side of the inclined slot E0. Similar to the seesaw principle, the left side of the interlocking plate B moves upward and disengages from the limit slot A0 of the extended third and fourth gear shift fork shaft A, allowing the extended third and fourth gear shift fork shaft A to move axially.

[0034] like Figure 4As shown, when shifting from a high gear (5th or 6th gear) to a low gear (4th or 3rd gear), the driver operates the preselector valve in the cab to first switch from high gear to low gear, and the first and second gear shift forks 4 of the main gear box disengage the gears and return to the neutral position. At this time, the auxiliary gear box shift fork shaft E with the bevel groove moves to the right under the push of the cylinder 11. When the auxiliary gear box shift fork shaft E with the bevel groove moves to the middle position, that is, the auxiliary gear box synchronizer does not enter the low gear zone, the right side of the interlocking plate B enters the bevel groove E0 of the auxiliary gear box shift fork shaft E with the bevel groove under the upward push of the positioning spring D during the reset process, and the left side of the interlocking plate B enters the limit groove A0 of the extended third and fourth gear shift fork shaft A. At this time, the extended third and fourth gear shift fork shaft A can be limited to prevent axial movement, and the main gear box cannot be engaged in the 4th gear or 3rd gear.

[0035] like Figure 5 As shown, when the auxiliary case shift fork shaft E with the bevel groove continues to move to the right under the push of cylinder 11, the auxiliary case synchronizer is engaged in the low gear area, and the interlocking plate B passes over the bevel groove E0 of the auxiliary case shift fork shaft E with the bevel groove and reaches the top on the left side. The right side of the interlocking plate B compresses the positioning spring D downward, and the left side of the interlocking plate B also disengages from the limit groove A0 of the extended third and fourth gear shift fork shaft A. At this time, the extended third and fourth gear shift fork shaft A can move axially, and the main case can be engaged in 4th gear or 3rd gear.

[0036] The upper end of the positioning spring D is always sleeved on the outer periphery of the limiting boss B1, which, on the one hand, guides the positioning spring D and, on the other hand, prevents the positioning spring D from falling out.

[0037] Based on the existing main and auxiliary box shifting mechanism, the present invention lengthens the third and fourth gear shift fork shaft 5 and adds a groove (that is, replaces it with a lengthened third and fourth gear shift fork shaft A); adds an oblique groove on the basis of the auxiliary box shift fork shaft 9 (that is, replaces it with an auxiliary box shift fork shaft E with an oblique groove), and adds an interlocking unit; prevents the auxiliary box synchronizer from switching from high gear to low gear, and does not allow the main box gear to be engaged before the auxiliary box synchronizer is engaged, thereby reducing the failure rate of the auxiliary box synchronizer. The overall structure is simple, easy to process, has a small number of parts, and is low in cost. The main and auxiliary box interlocking device of the present invention can be used as an option, and whether to install it can be selected according to the application scenario, so it is more practical and flexible.

[0038] The interlocking plate B disclosed in this embodiment has a positioning hole B3 at its hinge point and also includes a positioning shaft C coaxially extending through positioning hole B3 and hingedly connecting the interlocking plate B to the housing O. One end of positioning shaft C is a limit end C1, and the middle section of positioning shaft C near limit end C1 is a stage C2. Stage C2 is located within positioning hole B3, and there is a clearance fit between stage C2 and positioning hole B3. Interlocking plate B is loosely fitted onto stage C2 of positioning shaft C. When positioning shaft C is tightened, the left side of stage C2 contacts the housing, leaving a gap between interlocking plate B and positioning shaft C, allowing free rotation.

[0039] The interlocking plate B disclosed in this embodiment is provided with a second chamfer B2 on the contact surface with the limit groove A0 and the oblique groove E0 respectively, so as to facilitate the interlocking plate B to enter or exit the limit groove A0 or the oblique groove E0; the oblique groove E0 is provided with a first chamfer at both ends along the axial direction of the auxiliary box shift fork shaft E with an oblique groove, so as to facilitate the right side of the interlocking plate B to smoothly cross the oblique groove E0 of the auxiliary box shift fork shaft E with an oblique groove during the gear shifting process.

[0040] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0041] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0042] In addition, the various different implementation methods disclosed in this solution can also be arbitrarily combined, as long as they do not violate the ideas of this disclosure, they should also be regarded as the contents of the invention of this disclosure.

Claims

1. A main and auxiliary box interlocking device, characterized in that: It comprises an extended third and fourth gear shift fork shaft (A), wherein the length of the extended third and fourth gear shift fork shaft (A) is greater than the length of the reverse gear shift fork shaft (1), one end of the extended third and fourth gear shift fork shaft (A) passes through the reversing guide block (7) and the third and fourth gear guide block (6) in sequence and coaxially, and a limiting groove (A0) is provided near the upper part of one end of the extended third and fourth gear shift fork shaft (A); It also includes an auxiliary box shift fork shaft (E) with an oblique groove, wherein one end of the auxiliary box shift fork shaft (E) coaxially passes through the auxiliary box shift fork (10), and an oblique groove (E0) is provided on the lower part of the auxiliary box shift fork shaft (E); It also includes an interlocking unit, which includes an interlocking plate (B) hinged on the housing (0) between the main box and the auxiliary box, the hinge point of the interlocking plate (B) is located at the non-end of the interlocking plate (B), and the hinge axis of the interlocking plate (B) is parallel to each fork shaft; A limiting boss (B1) is provided at the lower portion of one end of the interlocking plate (B), a positioning spring (D) is fixed on the housing (0) below the limiting boss (B1), and the upper end of the positioning spring (D) is sleeved on the outer periphery of the limiting boss (B1); the upper portion of one end of the interlocking plate (B) is slidably arranged along the axial direction of the auxiliary box fork shaft (E) with the inclined groove on the lower portion of the auxiliary box fork shaft (E), and the upper portion of one end of the interlocking plate (B) is in mechanical contact with the inclined groove (E0); the lower portion of the other end of the interlocking plate (B) is in movable limiting contact with the limiting groove (A0); When the upper portion of one end of the interlocking plate (B) is located in the inclined groove (E0), the positioning spring (D) is in a natural state, and the lower portion of the other end of the interlocking plate (B) is in limiting contact with the limiting groove (A0).

2. The main and auxiliary box interlocking device according to claim 1, characterized in that: The hinge point of the interlocking plate (B) is provided with a positioning through hole (B3), and also includes a positioning shaft (C) that coaxially passes through the positioning through hole (B3) and hinges the interlocking plate (B) to the housing (0).

3. The main and auxiliary box interlocking device according to claim 2, characterized in that: One end of the positioning shaft (C) is a limit end (C1), and the middle section of the positioning shaft (C) close to the limit end (C1) is a stage (C2). The stage (C2) is located in the positioning through hole (B3), and there is a clearance fit between the stage (C2) and the positioning through hole (B3).

4. The main and auxiliary box interlocking device according to any one of claims 1 to 3, characterized in that: The contact surfaces of the interlocking plate (B) with the limiting groove (A0) and the inclined groove (E0) are respectively provided with a second chamfer (B2).

5. The main and auxiliary box interlocking device according to claim 4, characterized in that: The inclined groove (E0) is provided with a first chamfer at both ends along the axial direction of the auxiliary gearbox fork shaft (E) with the inclined groove.

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