Interlocking device for main box and auxiliary box

Abstract

According to the interlocking device for the main box and the auxiliary box, a third-gear and fourth-gear shifting fork shaft is replaced with a lengthened third-gear and fourth-gear shifting fork shaft, an auxiliary box shifting fork shaft is replaced with an auxiliary box shifting fork shaft with a chute, and an interlocking unit is additionally arranged; the auxiliary box synchronizer is prevented from being switched from a high gear to a low gear, the gear of the main box is not allowed to be engaged before the auxiliary box synchronizer is engaged in place, the fault rate of the auxiliary box synchronizer is reduced, the overall structure is simple, machining is easy, the number of parts is small, and cost is low; whether installation is performed or not can be selected according to application scenes, and the practical operability and flexibility are higher.

Description

Technical Field

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

[0002] Most commercial vehicle transmissions adopt a main and auxiliary box structure, in which the auxiliary box mostly uses a cylinder to drive the cylinder shaft to drive the auxiliary box fork to move axially back and forth, and the auxiliary box fork drives the auxiliary box synchronizer sleeve to move and shift gears, so as to realize the conversion of high and low gears of the auxiliary box. In order to reduce the damage of the auxiliary box synchronizer caused by improper operation of the driver, it is generally recommended that the driver pre-select the high and low gear pre-selection valve first, then pick up the gear, and stay in the neutral position for 0.5s before shifting the expected gear of the main box, so as to ensure that the auxiliary box synchronizer is fully engaged before shifting the main box gear. However, this recommendation requirement cannot be guaranteed to be implemented 100%, so it is necessary to try to ensure that the main box gear is not allowed to be engaged before the auxiliary box synchronizer is engaged in place in terms of mechanical mechanism design. At present, most commercial vehicle transmissions on the market have applied the main and auxiliary box interlocking device with an interlocking plate structure, such as Fast S series, Sinotruk HW transmission, etc., but these interlocking devices are provided with multiple components such as interlocking plates, pressure plates, multiple pressure plate bolts, spring seats, etc. The detailed structures of these devices are not described in detail here. The interlocking devices currently used in the market have many parts, complex structures, high precision parts, difficult processing, and high costs. For light commercial vehicle transmissions, adding this interlocking device will increase costs. In addition, through the collection of fault information on the auxiliary case synchronizer of light commercial vehicle transmissions in the market, the low-speed side failure of the auxiliary case synchronizer accounts for more than 70% of the total auxiliary case synchronizer failures.

[0003] The existing main and auxiliary gearbox shifting mechanism is as follows Figure 2 , including the main gearbox shift mechanism: reverse gear fork shaft assembly (1 reverse gear fork shaft, 2 reverse gear fork, 3 reverse gear guide block), 4 first and second gear forks, third and fourth gear fork shaft assembly (5 third and fourth gear fork shaft, 6 third and fourth gear guide block, 7 reversing guide block, 8 third and fourth gear fork), auxiliary gearbox shift mechanism: 9 auxiliary gearbox fork shaft, 10 auxiliary gearbox fork. The main gearbox shift mechanism and the auxiliary gearbox shift mechanism have no mechanical connection and are independent of each other; 9 During the movement of the auxiliary gearbox fork shaft, the main gearbox fork shaft (1 reverse gear fork shaft, 5 third and fourth gear fork shaft) can freely shift gears, which will cause the main gearbox synchronizer to shift gears first without the auxiliary gearbox synchronizer being in place, resulting in a sharp increase in the synchronous inertia of the auxiliary gearbox synchronizer, and the auxiliary gearbox synchronizer is easily damaged. Summary of the invention

[0004] In view of the above problems, the purpose of the present invention is to provide a main-sub-box interlocking device, which solves the problems of low-speed side failure of the sub-box synchronizer and the complex structure and high cost of the existing interlocking device by rationally arranging the component structure.

[0005] To achieve the above object, the technical solution adopted by the present invention includes:

[0006] A main-and-sub-box interlocking device comprises an extended third-and-fourth gear shift fork shaft, wherein the length of the extended third-and-fourth gear shift fork shaft is greater than the length of the reverse gear shift fork shaft, wherein 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; further comprises an auxiliary-box shift fork shaft with an oblique groove, wherein 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; further comprises an interlocking unit, wherein the interlocking unit comprises an interlocking plate hinged on a housing 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, and the hinge axis of the interlocking plate is parallel to each fork shaft; a limiting boss is provided at the lower part of one end of the interlocking plate, a positioning spring is fixed on the shell below the limiting boss, the upper end of the positioning spring is sleeved on the outer periphery of the limiting boss, the upper part 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 part of the auxiliary box fork shaft with the bevel groove, and the upper part of one end of the interlocking plate is in mechanical contact with the bevel groove; the lower part of the other end of the interlocking plate is in movable limiting contact with the limiting groove; when the upper part of one end of the interlocking plate is located in the bevel groove, the positioning spring is in a natural state, and the lower part of the other end of the interlocking plate is in limiting contact with the limiting groove.

[0007] Preferably, a positioning through hole is provided at the hinge point of the interlocking plate, 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 step stage, which is located in the positioning through hole, and there is a clearance fit between the step 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 at both axial ends of the auxiliary box fork shaft with the bevel groove.

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

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

[0013] (2) The main and auxiliary box interlocking device 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 specific embodiments, 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 A schematic diagram of the structure of the main and auxiliary gearbox shifting mechanism;

[0017] Figure 3 The working principle diagram of the main and auxiliary box interlocking device of the present invention (auxiliary box high-end area);

[0018] Figure 4 The working principle diagram of the main and auxiliary box interlocking device of the present invention (the auxiliary box right high-speed switching resistance process);

[0019] Figure 5 It 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 A three-dimensional view of the center positioning axis;

[0021] Figure 7 for Figure 1 Assembly section view of the center positioning shaft and the 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 forks, 5 third and fourth gear fork shaft, 6 third and fourth gear guide blocks, 7 reversing guide blocks, 8 third and fourth gear 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 inclined 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 changes made on the basis of the technical solution of this application fall within the protection scope of the 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 of the drawings in 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] The present embodiment discloses a main-and-auxiliary case interlocking device, comprising an extended third-and-fourth gear shift fork shaft A, 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 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; that is, 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 a limiting groove A0 is provided near the upper part of one end of the extended third-and-fourth gear shift fork shaft A;

[0031] It also includes an auxiliary box shift fork shaft E with an oblique groove, one end of which coaxially passes through the auxiliary box shift fork 10, and an oblique groove E0 is provided at the lower part of the auxiliary box shift fork shaft E with an oblique groove; that is, the auxiliary box shift fork shaft 9 in the existing mechanism is replaced by the auxiliary box shift fork shaft E with an oblique groove, and an oblique groove E0 is provided at the lower part of the auxiliary box 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 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, 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, 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-speed range (5th gear or 6th gear), the right side of the interlocking plate B is at the top of the 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, and the extended third and fourth gear shift fork shaft A can move axially;

[0034] like Figure 4As shown, when shifting from a high gear range (5th or 6th gear) to a low gear range (4th or 3rd gear), the driver operates the preselector valve in the cab to switch from high gear to low gear first, 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 range, 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 the 3rd gear.

[0035] like Figure 5 As shown, when the auxiliary box shift fork shaft E with the bevel groove continues to move rightward under the push of the cylinder 11, the auxiliary box synchronizer is engaged in the low gear zone, the interlocking plate B passes over the bevel groove E0 of the auxiliary box shift fork shaft E with the bevel groove and reaches the top of the left side, the right side of the interlocking plate B compresses the positioning spring D downward, and the corresponding left side of the interlocking plate B also disengages from the limit groove A0 of the lengthened third and fourth gear shift fork shaft A, at this time, the lengthened third and fourth gear shift fork shaft A can move axially, and the main box can be engaged in the 4th gear or the 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 gear shifting mechanism, the present invention lengthens the third and fourth gear shift fork shaft 5 and adds a groove (that is, it is replaced with a lengthened third and fourth gear shift fork shaft A); an inclined groove is added on the basis of the auxiliary gear shift fork shaft 9 (that is, it is replaced with an auxiliary gear shift fork shaft E with an inclined groove), and an interlocking unit is added; the auxiliary gear synchronizer is prevented from switching from high gear to low gear, and the main gear is not allowed to be engaged before the auxiliary gear synchronizer is in place, thereby reducing the failure rate of the auxiliary gear synchronizer. The overall structure is simple and easy to process, the number of parts is small, and the cost is low. The main and auxiliary gear 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 has stronger practicality and flexibility.

[0038] The hinge point of the interlocking plate B disclosed in this embodiment 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. One end of the positioning shaft C is a limit end C1, and the middle section of the positioning shaft C near the limit end C1 is a stage C2, which is located in the positioning through hole B3, and there is a clearance fit between the stage C2 and the positioning through hole B3. The interlocking plate B is loosely sleeved on the stage C2 of the positioning shaft C. When the positioning shaft C is tightened, the left side of the stage C2 contacts the housing, and a gap is left between the interlocking plate B and the positioning shaft C, so that it can rotate freely.

[0039] The interlocking plate B disclosed in this embodiment is respectively provided with a second chamfer B2 on the contact surface with the limit groove A0 and the inclined groove E0 to facilitate the interlocking plate B to enter or leave the limit groove A0 or the inclined groove E0; the inclined groove E0 is provided with a first chamfer at both ends along the axial direction of the auxiliary box fork shaft E with the inclined groove to facilitate the right side of the interlocking plate B to smoothly cross the inclined groove E0 of the auxiliary box fork shaft E with the inclined 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 in the above embodiments. Within the technical concept of the present disclosure, a variety of simple modifications can be made to the technical solution of the present disclosure, and these simple modifications all fall within the protection scope 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 suitable 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 modes disclosed in this solution may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the content invented by the present 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 a reversing guide block (7) and a third and fourth gear guide block (6) in sequence 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, 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 at the lower part of the auxiliary box shift fork shaft (E) with an oblique groove; 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 part 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 part of one end of the interlocking plate (B) is slidably arranged on the lower part of the auxiliary box fork shaft (E) with the inclined groove along the axial direction of the auxiliary box fork shaft (E), and the upper part of one end of the interlocking plate (B) is in mechanical contact with the inclined 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 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 interlocking plate (B) is provided with a positioning through hole (B3) at the hinge point, and also includes a positioning shaft (C) which 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 first chamfers at both ends along the axial direction of the auxiliary box fork shaft (E) with the inclined groove.

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